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Specification for Power Quality Restorer for AC
Traction System
Effective from : 01.01.2015
Specification No. TI/SPC/PSI/PQR/0140 (12/2014)
1
SPECIFICATION No. TI/SPC/PSI/PQR/0140 (12/2014)
GOVERNMENT OF INDIA MINISTRY OF RAILWAYS
TECHNICAL SPECIFICATION
FOR
POWER QUALITY RESTORER
FOR
AC TRACTION SYSTEM
ISSUED BY
TRACTION INSTALLATION DIRECTORATE,
RESEARCH DESIGNS & STANDARDS ORGANISATION,
MANAKNAGAR,
LUCKNOW – 226 011.
[Web site: www.rdso.indianrailways.gov.in]
ISSUED: December, 2014
Specification for Power Quality Restorer for AC
Traction System
Effective from : 01.01.2015
Specification No. TI/SPC/PSI/PQR/0140 (12/2014)
2
SPECIFICATION: Power Quality Restorer for AC Traction System.
SPECIFICATION No.: TI/SPC/PSI/PQR/0140 (12/2014)
Specification Number Amendment /
Revision No.
Total Pages Date of
Issue
TI/SPC/PSI/PQR/0140
(12/2014)
0 44 ……….
PREPARED BY CHECKED BY APPROVED BY
SIGNATURE
NAME Praveen
Chandra
Arvind Kumar A.K.Sharma
DATE 12.12.2014 15.12.2014 16.12.2014
DESIGNATION Senior
Section Engineer
Dy. Director
(TI-PSI)
Joint Director
(TI-PSI)
Specification for Power Quality Restorer for AC
Traction System
Effective from : 01.01.2015
Specification No. TI/SPC/PSI/PQR/0140 (12/2014)
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INDEX
Para Title Page No
1. Scope 6
2. Governing Specification 6
3. Environmental Conditions 7
4. Traction Power Supply 8
5. Technical Specification 11
6. General Arrangement for Control of Power
Quality Restorer and Associated Equipments
14
7. Control Panel 15
8. Current & Potential Transformer 18
9. Protection against Lightning & Surges 18
10. Earthing 18
11. Painting 18
12. Fastners 19
13. Testing of Power Quality Restorer 19
14. Capitalisation of Losses & Benefits 23
15. Technical Data & Drawings 23
16. Additional Particulars 25
17. Erection, Testing & Commissioning 25
18. Spare Parts, Catalogue & Support
Commitment
25
19. Training of Indian Railway Engineers 25
Specification for Power Quality Restorer for AC
Traction System
Effective from : 01.01.2015
Specification No. TI/SPC/PSI/PQR/0140 (12/2014)
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ANNEXURES
Annexure
Number
Annexure Title Page No.
A Schedule of Guaranteed Performance,
Technical & other Particulars
26
B Associated Specifications to Power Quality
Restorer Equipment
33
APPENDIX
Number Appendix Title Page No.
I Related Equipment at Traction Sub-station 34
II General Scheme of Supply for 25 kV, 50 Hz,
Single Phase Traction System
35
III A Typical Daily Load Curve of a Traction
Sub-station
36
III B Typical Daily Average Power Factor of a
Traction Sub-station
37
III C Summarised Load information furnished by
Zonal Railway
38
IV General Scheme of IGBT based Power Quality
Restorer
39
V Typical Schematic Diagram of Protection for
Double Transformer Traction Sub-Station
40
VI Equivalent circuit of Traction Power Supply 41
VII Annunciation Label 42
VIII Benefits/Loss information to be submitted by
the Tenderer
43
IX Method of Calculation of Capitalised Cost 44
Specification for Power Quality Restorer for AC
Traction System
Effective from : 01.01.2015
Specification No. TI/SPC/PSI/PQR/0140 (12/2014)
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GLOSSARY OF ABBREVIATION USED IN THE SPECIFICATION
AMC Annual Maintenance Contract
APP All Poly Propylene
BT Booster Transformer
CD Contract Demand
CRCA Cold Rolled Corban Annealed
CT Current Transformer
EMU Electrical Multiple Unit
GTO Gate Turn Off
HRC High Rupturing Capacity
IGBT Insulated Gate Bipolar Transistor
LED Light Emitting Diodes
KA Kilo Ampere
KV Kilovolt
KVAR Kilo Volt Ampere Reactive
KVp Kilovolt Peak
LT Low Tension
MD Maximum Demand
MEMU Main Line Electrical Multiple Unit
MSL Mean Sea Level
MVA Mega Volt Ampere
MVAHr Mega Volt Ampere Hour
MWHr Megawatt Hour
OHE Overhead Equipment
PCB Polychlorinated-Biphenyl
PQR Power Quality Restorer
PT Potential Transformer
SCADA Supervisory Remote Control and Data Acquisition System
THD Total Harmonic Distortion
TSS Traction Sub-station
USL Upper Specified limit
WPC Wrong Phase Coupling
Specification for Power Quality Restorer for AC
Traction System
Effective from : 01.01.2015
Specification No. TI/SPC/PSI/PQR/0140 (12/2014)
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SPECIFICATION
FOR
POWER QUALITY RESTORER EQUIPMENT FOR RAILWAY TRACTION SUBSTATION
SPECIFICATION No. TI/SPC/PSI/PQR/0140 (12/2014)
1.0 Scope
1.1 Indian Railways employ 220/25 kV or 132/25 kV or 110/25 kV or
66/25 kV Traction Sub-station (TSS) for supplying Power to the 25 kV Overhead lines for Electric Traction. Hitherto fixed Shunt Capacitor
Banks have been provided at the Traction Sub-stations for improving
power factor.
With a view to achieve nearly unity power factor and mitigate
Harmonics, „Dynamic Compensation Equipment of Reactive Power
and Harmonics‟ is intended to be provided at the Traction Sub-
stations. The Equipment shall be connected on the 25 kV AC Network. Dynamic Compensation of Reactive Power and Harmonics
shall be achieved with the employment of IGBTs or other advanced
Electronic Switching Devices. Compensation may be stepless or in finer steps such that advantages of improved Power Factor and
mitigated harmonics are optimised.
1.2 This Specification covers design, manufacture, supply, testing and commissioning of „Power Quality Restorer‟. It is for outdoor/indoor
installation at the Traction Sub-station of single Phase AC systems
(excluding 2x25 kV AT Feeding System) on Indian Railways for the
mitigation of Harmonics, improvement of Power Factor and reduction of Maximum Demand.
1.3 The „Power Quality Restorer‟ shall be complete with Step down
Transformer, Control Gear, Protective Relays, IGBTs and / or Electronic Switching Device and accessories necessary for its efficient
operation. All such parts and accessories shall be deemed to be
within the scope of this Specification whether or not specifically
mentioned.
1.4 The successful Tenderer shall be required to erect & commission the
equipment. The offer shall, therefore, be inclusive of all expenses
including deputing Engineers and Supervisors by the Tenderer for handling, installation, testing, commissioning of the equipment and
meeting performance requirement.
1.5 All Civil Engineering works, connected with foundations of Power Quality Restorer, associated Transformers, Circuit Breaker, Isolator,
Series Reactor, Potential Transformer, Current Transformer,
Supporting Steel Structures and construction of building for housing
associated indoor equipment shall be done by the Contractor.
2.0 Governing Specification
2.1 The Power Quality Restorer and associated items shall, unless
otherwise specified herein, conform to the latest revision of
Standards mentioned below and associated Specifications listed in
Specification for Power Quality Restorer for AC
Traction System
Effective from : 01.01.2015
Specification No. TI/SPC/PSI/PQR/0140 (12/2014)
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Annexure-B as well as per the Indian Electricity Rules, as may be
applicable.
i) IS:13585(Pt.I)1994 : Low voltage Capacitors .
ii) IEC-60146-2(1999), : Electrical Rating & characteristics of Voltage
section-7 source Converter.
iii) IEC-60747-9 -2007 : Semiconductor Devices -Discrete Devices
(Insulated- Gate Bipolar Transistors)
2.1.1 In case of any overlapping or conflict in contents of the above Standards and this Specification, stipulations of this Specification
shall prevail.
2.2 Deviations
2.2.1 Any deviation from this Specification, proposed by the Tenderer,
intended to improve performance, utility and overall efficiency, shall
be given due consideration, provided full particulars of the deviation with justification thereof are furnished. In such case, the Tenderer
shall quote according to this Specification and the deviations
proposed by him shall be quoted as an alternate/ alternatives.
2.2.2 Pre-bid meeting shall be arranged by the Purchaser, with eligible Tenderers for the particular requirements of this Specification, site
conditions, mode of transport, availability of site, erection and
commissioning etc.
It is advised that the Bidders shall visit the sites/sections and
familiarise themselves with the local conditions and understand the
requirements of the system in detail, before tendering the Bids and obtain clarifications as may be necessary from the Purchaser.
After the award of the Contract, the Tenderer shall be fully
responsible for successful integration of the compensation scheme
with the associated scheme of Equipment in the switchyard and with the Remote Terminal Units (RTUs) and any items later considered as
essentially required for successful integration shall be within the
scope of the supply and work of the Tenderer.
3. Environmental Conditions
3.1 All Equipments shall be suitable for outdoor/indoor use in tropical
climate and in areas subjected to heavy rainfall, pollution due to
industrial and coastal climates and severe lightning surges in India.
The maximum ambient temperature may reach 500 C in shade, with maximum humidity reaching up to 100%. However, for the design of
the equipment, 500 C category of temperature shall be taken.(Ref.
Table 1 of IS:2834 - 1986)
i) Maximum temperature of Air (in shade) - 550 C ii) Minimum temperature of Air (in shade) - (-)100 C
iii) Maximum relative humidity - 100%
iv) Annual rainfall ranging from - 1750 mm to 6250 mm v) Maximum number of Thunder storm - 85 days
days per annum.
vi) Maximum number of dust storm days - 35 days per annum.
vii) Number of Rainy days per annum - 120 days
Specification for Power Quality Restorer for AC
Traction System
Effective from : 01.01.2015
Specification No. TI/SPC/PSI/PQR/0140 (12/2014)
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viii) Basic wind pressure - 200 kgf/m2
ix) Altitude above Mean Sea level (MSL) - 2000 meters.
3.2 Vibrations
The Equipment is expected to be installed on foundation in the ground or on Steel Structures, located by the side of Railway tracks
and subjected to vibrations due to the passage of trains. The
amplitude of these vibrations lies in the range of 30 to 150 microns,
with instantaneous peaks going upto 350 microns. These vibrations occur with rapidly varying time periods in the range of 15 to 70 ms.
4.0 Traction Power Supply system
4.1 General Scheme
Single phase, 50 Hz, AC Power Supply for Railway Traction at 25 kV
is obtained from 220/132/110/66 kV 3-phase Grid supply through Step down Power Transformers. The Primary winding is connected
between any two phases of 220/132/110/66 kV, three phase
effectively earthed transmission networks of the Supply Authorities.
The spacing between adjacent Traction Sub-stations varies between 30 to 80 kms. One terminal of the 25 kV Secondary winding of the
Traction Transformer is connected to the Overhead Equipment
(abbreviated as OHE). The other winding is solidly earthed and also connected to Traction Rails.
The load current flows through the OHE to the locomotives and
returns through rail and earth to the Traction Sub-stations. In the middle of adjacent Traction Sub-stations, a dead zone
known as „Neutral Section‟ is provided to isolate the two Phases. The
Power to the OHE on one side of the Traction Sub-stations is fed by
one feeder Circuit Breaker. OHE of each track is controlled by an Interrupter. In case of fault on the OHE, the Feeder Circuit Breaker
clears the fault.
4.2 A Schematic Diagram of a typical arrangement, showing the „General
Feeding Arrangement‟ of a Traction system, as well as the „Schematic General Arrangement at a Traction Sub-station‟ is given in Sketch
No. ETI/PSI/702-I (enclosed at Appendix-II).
4.3 The incoming 220/132/110/66 kV, AC supply voltage may vary
between (+)10% to (–)12.5% as per Rule No. 54 of Indian Electricity Rules-1956. The supply frequency may vary by (±)3% from the
Standard frequency of 50 Hz.
4.4 Protection system
4.4.1 Relays are provided for the protection of Traction Transformers. The
Schematic Diagram for the Protection of Traction Transformers & OHE is given in Appendix-V.
a) Differential Protection b) IDMT Over Current Protection on 220/132/110/66 kV side.
c) Restricted Earth Fault Protection on 220/132/110/66kV side.
d) IDMT Over Current on 25 kV side. e) Restricted Earth Fault on 25 kV side.
4.4.2 The following Protective Relays are provided for the protection of
Over Head Equipments:
Specification for Power Quality Restorer for AC
Traction System
Effective from : 01.01.2015
Specification No. TI/SPC/PSI/PQR/0140 (12/2014)
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a) Distance Protection b) Instantaneous Over Current Protection.
c) Wrong Phase Coupling Protection.
Note: At some Traction Sub-stations, the Static/Microprocessor
based Relays have been provided (partly or Complete).
4.5 Brief on Equipment provided at the Traction Sub-station is given in
Appendix-I.
4.6 25 kV, AC OHE and Traction Transformer
4.6.1 The OHE generally consists of a stranded Cadmium Copper Catenary of 65 sq. mm. area and a Grooved Copper Contact wire of 107 sq.
mm. area providing a total of 150 sq.mm. copper equivalent. The
loop impedance of the OHE is as under:
The values without Booster Transformer (BT) and Return Conductor–
- Single track OHE 0.41 700 ohms/km
- Double track OHE 0.24 700 ohms/km
- Triple track OHE 0.18 700 ohms/km
The values with Booster Transformers (BT) and Return Conductor– - Single track OHE 0.70 700 ohms/km
- Double track OHE 0.43 700 ohms/km
- Triple track OHE 0.27 700 ohms/km
4.6.2 In some Sections Contact wires of 150/161/193 mm sq. are also
used. The Tenderer may obtain details of impedances from the Zonal Railways, if such wires are used.
4.6.3 Traction Transformer
The Resistance and the Reactance of a typical 13.5 MVA and 21.6
MVA Traction Power Transformer at the Traction Sub-station are (0.179 + j 5.49) ohms and (0.132 + j 4.05) ohms respectively. Only
one transformer is in service at a time. For other ratings of
transformer, the concerned railway shall furnish these values.
4.6.4 Clearances
A minimum clearance of 500 mm is provided, between any live part
at 25 kV, AC and Earth in the 25 kV AC Traction Sub-station.
4.7 Nature of faults on the OHE system
4.7.1 OHE may be subject to frequent Earth faults, or snapping of OHE and touching the Rail/Earth, or loose wires carried by Birds coming in
contact with OHE below Overline Structures, miscreant activities etc.
Faults are cleared by Feeder Circuit Breaker, which operates on
any one or both of the following Protective Relays, depending on the proximity of the fault.
a) Distance Protection Relay (circular or parallelogram characteristics).
b) Instantaneous Over Current Relay.
c) Inadvertent coupling of two Phases between adjacent Traction Sub-stations at the Neutral Section or at intermediate
Specification for Power Quality Restorer for AC
Traction System
Effective from : 01.01.2015
Specification No. TI/SPC/PSI/PQR/0140 (12/2014)
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Switching Stations, in case of extended feed condition, which
are cleared by one of the Feeder Circuit Breakers at either
end of Traction Sub-station through a "Mho Relay” known as „Wrong Phase Coupling (WPC) Relay‟.
4.7.2 Short Circuit Level
For different Grid supply voltages, Short Circuit Level on Primary side
of Traction Transformer may vary between 7 to 8 kA depending upon
the proximity of the Traction Sub-station to the Generating station. The actual values of fault-level shall be furnished by the
Railway, depending upon the location of Traction Sub-station. The
level of Short Circuit on 25 kV side for a fault in the vicinity of a Traction Sub-station could be around 4 kA. The exact Short Circuit
Level on 25 kV side, at each Traction Sub-station, shall be indicated
in the Tender Paper.
4.8 Nature of load on the 25 kV system
4.8.1 Traction load is of frequent and rapidly varying nature and may
fluctuate between no-load and over loads. While a precise load cycle may be difficult to forecast, a load curve for a typical day together
with indications of the average Power Factor, shall be supplied by the
Railway, in a Format as indicated in Appendix III A & Appendix III B.
Appendix III (A) shows the average MVA (averaged over every 15 minutes period) versus time. Railway shall also provide the
summarised cycle as shown in Appendix-III C based on which the
capitalisation of losses and benefits would be worked out by the
Tenderer, with reference to Clause 14 of this Specification.
4.8.2 The AC Electric Rolling Stock / AC-DC Electric Locomotive / EMUs/ MEMUs are fitted with single-Phase Bridge connected Silicon
Rectifiers with Smoothening Reactor for feeding the DC Traction
Motors. The Rectifiers introduce Harmonic currents on the 25 kV Power supply. Also there are EMUs/ MEMUs / Locomotives with GTO
(Gate Turn Off)/IGBT/Pulse Width Modulation Devices, in place of
Silicon Rectifiers. Typical percentages of the current Harmonics
present in the Traction current with Electric Rolling stock are as follows:
S.No. Harmonic
Order
With Diode
Rectifier (%)
3-Phase Rolling Stock
with GTO‟s/IGBTs*
1. 3rd harmonic 15 The maximum Harmonic
current of the individual Harmonic at no time
shall exceed 0.5 Amps.
except for 3rd harmonic which may have max.
value of 5 Amps.
2. 5th harmonic 6
3. 7th harmonic 4
4. 9th harmonic -
5. 11th harmonic -
Total Harmonic
Distortion (THD)
16.64
* The GTO or IGBT type of Locomotives/EMUs/MEMUs produce substantial 2nd harmonic currents which may be upto 10% of
Fundamental current.
Specification for Power Quality Restorer for AC
Traction System
Effective from : 01.01.2015
Specification No. TI/SPC/PSI/PQR/0140 (12/2014)
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These are the typical values, Actual values at a particular
Traction Sub-station could be different.
Successful Tenderer shall measure these values before
submitting final design. The Average Power Factor of the Electric locomotive or Electric Multiple Units varies between 0.7 lagging to
unity.
These figures are to serve as guidelines only. The actual
Harmonic content shall vary from Traction Sub-station to Traction
Sub-station. Indian Railways shall provide the data for the Harmonic content on the 25 kV line for particular Traction Sub-
station.
4.8.3 In big yards and in the vicinity of Electric Loco Sheds, a number of
locomotives may be idle with only the load of their Auxiliaries and drawing higher Reactive Power.
5.0 Technical Specification
5.1 Traction System Particulars i) System - Single Phase AC Traction system.
ii) Nominal System voltage - 25 kV (Phase to Earth)
iii) Variation in the Traction - 19 kV to 27.5kV (upto 30 kV at instants)
Supply Voltage. (down to 17.5 kV at instants)
iv) Equipment Voltage class - 52 kV
v) Rated Frequency - 50 Hz + 3%
vi) Average Power Factor of - Between 0.7 and 0.8 lagging the Traction System.
(The typical load cycle shall be supplied by the Railway as
mentioned in Clause 4.8.1). vii) Harmonics - As given in Para 4.8.2
5.2 Power Quality Restorer Equipment
5.2.1 General Scheme
a) General Scheme of Power Quality Restorer Equipment is shown in
Appendix-IV. Switching of Capacitive KVAR and Harmonics
mitigation is through IGBT based PQR Equipment.
The Power Quality Restorer Equipment shall employ air-cooling.
All switching shall be almost transient free.
b) Indian Railways shall provide the data for the Harmonic Content in the 25kV line for the particular Traction Sub-station. This shall
serve as the guideline to the Bidder to size and quote for the
Power Quality Restorer. In addition, the successful Tenderer shall
also measure and record load variation pattern and Harmonic contents for 7 consecutive days at the Traction Sub-station on
which „Power Quality Restorer Equipment‟ is to be provided and
design the Equipment accordingly, which shall be approved by RDSO.
c) The successful Tenderer shall also design the Power Quality
Restorer including its components and related Supporting Structures, including Layout as per actual site conditions, which
shall be approved by RDSO for first system.
Specification for Power Quality Restorer for AC
Traction System
Effective from : 01.01.2015
Specification No. TI/SPC/PSI/PQR/0140 (12/2014)
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d) Average Power Factor, obtained after installation of Power Quality
Restorer, shall be close to unity and in no case it should be less
than 0.95 lagging and the Power Factor shall not go leading.
Successful Tenderer shall also bring to the notice of Purchaser any
enhancement required in the Power Quality Restorer Equipment
capacity (in kVAR) as specified in the Tender, in order to achieve the desired Harmonic limit as well as the Power Factor.
5.2.2 Ratings
The „Power Quality Restorer Equipment‟ as per this specification may
comprise of fixed and variable compensation, depending upon the
requirement at a particular Traction Sub-station. The ratings indicated in (A) & (B) below are only typical values and the ratings of
„Power Quality Restorer Equipment‟ system based on total reactive
compensation require at a particular Traction Sub-station shall be furnished by Purchaser/Railways.
A) Transformer
i) Rated Primary Voltage - 27 kV
Rated Secondary Voltage - 433 V (see Note-1 below) ii) No load Voltage on the - 27 kV
Primary side.
(The no load here refers to the Traction load. When the
Traction load is negligible, the 25 kV Bus voltage at the Traction Sub-station is 27 kV. This voltage may some
times go upto 30 kV).
iii) Rated Power frequency withstand voltage:
Primary winding - 95 kV for 1 minute. Secondary winding - 3 kV for 1 minute
(see Note-2 below)
iv) Rated Lightning Impulse withstand voltage:
Primary winding : - 250 kVp Secondary winding: - Not applicable
v) Rated frequency: - 50 Hz + 3%
vi) Rated output - Typically 2 MVA However exact rating depends up on „Power Quality
Restorer Equipment‟ system rating (approx. 1.5 times
the variable kVAR rating, being fed through transformer)
Note – 1: Any other secondary voltage/voltages may be adopted with approval of RDSO depending on techno-economic
suitability
Note – 2: These values correspond to 433 Volts secondary voltage.
B) IGBT based Power Quality Restorer-
i) Fixed compensation HT Capacitors - 1100 kVAR with Series Reactor
[As per RDSO Specification No. TI/SPC/PSI/FC&SR/0100]
ii) Dynamic Compensation comprising - ± 1100 kVAR of 11 Nos. 1-phase
433 Volts ± 100
KVAR in parallel
Specification for Power Quality Restorer for AC
Traction System
Effective from : 01.01.2015
Specification No. TI/SPC/PSI/PQR/0140 (12/2014)
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iii) Total range of compensation - 0-2200 kVAR
Note: The Voltage and KVAR rating of each Panel indicated
above are typical and each Panel rating may be suitably
designed by the Tenderer to provide +/- 1100 kVAR Dynamic compensation, more importantly the required
0 to 2200 kVAR range ( or the range as given in the
Tender Specification).
v) Total Harmonic Distortion (THD) of
Voltage & Current to be achieved - <5%
5.3 Resonant Condition and Inrush Current
The rating of Damping Reactor and Capacitor Bank of each branch shall be such that it does not resonate with the source impedance at
any of the Harmonics of Traction current (refer Para 4.8.2).
Appendix-VI may be referred for Equivalent circuit.
It shall also be ensured that the Inrush current of the Capacitor Bank is within limits and does not exceed the maximum
value guaranteed. Calculations shall be furnished with the Tender in
respect of Inrush current and Resonant frequencies for each of the
operating conditions as also for each Capacitor steps.
5.4 Control of Power Quality Restorer Equipment
5.4.1 The control of the Power Quality Restorer Equipment shall be based on the Reactive Power and Harmonics generated by the Traction load.
Measurement of Reactive Power shall form part of the Control
circuitry.
For this purpose, the two transformer LV currents through 750A/5A CTs, and one Feeder voltage through 25 kV/110 V PT or by
using direct LV side voltage (i.e. 433 V) of the Stepdown Transformer
shall be utilized as input to the Control circuit. (Refer Appendix IV.
Injection of Capacitive KVAR shall be either stepless or in
suitable steps to control Power Factor precisely.
Changes in the kVAR ratings of the Power Quality Restorer Equipment with changes in the 25 kV Feeder Bus voltage shall be
taken care through control circuit. The Power Factor of the Traction
load usually varies from 0.70 to 0.80 (lagging).
The compensation for the Harmonics shall be stepless and shall adapt to the changing load requirements, so that the specified Total
Harmonic Distortion (THD-I) is achieved at all loads.
5.5 Basic Insulation Level (BIL)
The Basic Insulation Level of the complete Low Tension Capacitor
Bank and other associated Equipments shall be as follows:
5.5.1 For Primary side Equipment
a) 1.2/50 s Impulse withstand voltage - 250 kVp
b) One-minute Wet Power Frequency withstand
Voltage (rms) (except Transformer Primary
winding for which 95 kV is applicable) - 105 kV.
Specification for Power Quality Restorer for AC
Traction System
Effective from : 01.01.2015
Specification No. TI/SPC/PSI/PQR/0140 (12/2014)
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5.5.2 For Secondary side Equipment
a) 1.2/50 s Impulse withstand voltage - N.A.
b) One-minute wet power frequency withstand
voltage (rms) - 3 kV
5.6 Protection of Power Quality Restorer
5.6.1 The offer shall include design and supply of a comprehensive
Protection scheme for the equipment offered by the tenderer. Full
details, including Relay characteristics of the Protection Scheme, offered for the Transformer, Capacitor Bank, IGBT or any other
superior device etc. shall be fully explained in the offer giving
necessary calculations and diagrams.
5.6.2 The Protective Relays offered shall be properly coordinated with the
existing scheme of protection indicated in Drawing No. ETI/PSI/024
attached at Appendix-V.
5.6.3 The Protection system for Shunt Capacitor Bank (if capacitive kVAR injection is through Capacitor Bank) shall include protection against
over current, overload, over voltage, unbalance.
Each Capacitor Element shall be individually protected by means of Internal Fuses. The fuse shall be connected in series with
each Capacitor Element inside the Capacitor Unit to limit the effects
of dielectric failures. If puncture of dielectric occurs, only one element shall be disconnected and the capacitor unit continues to
operate. While selecting the fuse rating, it would be necessary to
choose proper time current characteristics, which in turn significantly
depend upon the cross section and circumference of the Fuse. Fuses chosen shall have adequate thermal capability and comply with
relevant IS/IEC Specifications.
5.6.4 The Protection system for IGBT or any other Electronic switching device shall include protection against over voltage, over current,
over load etc. In case of TSC, each step of compensation getting
added / removed shall be protected individually by fast acting Fuses.
5.6.5 The protection system for the 27 kV/433+433 V, Single Phase, Step-
down Transformer of suitable rating shall include Differential
Protection, Earth Leakage Protection, Over Current Protections in
Primary side as well as Secondary side in each individual Panels, apart from the under voltage and over voltage protection at 25 KV
bus side.
6. General arrangement for Control of Power Quality Restorer Equipment and associated Equipments
6.1 The Control of Power Quality Restorer Equipment shall be of
outdoor/indoor type, mounted on Steel Racks, for connection to the
25 kV Bus as indicated in Drawing No. ETI/PSI/SK/326 (enclosed at Appendix-VI). The Layout Drawing with Cross Sectional details for
the „Control of Power Quality Restorer‟ shall be furnished by the
Tenderer, taking into account the existing layout of other Equipments
at the Traction Sub-station as indicated in the Drawing No. ETI/PSI/SK/326 (enclosed at Appendix-VI).
Specification for Power Quality Restorer for AC
Traction System
Effective from : 01.01.2015
Specification No. TI/SPC/PSI/PQR/0140 (12/2014)
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The Capacitor Bank, if any, shall consist of groups of individual
Capacitor Units, connected in series parallel combination to deliver
the rated output, at nominal rated system voltage, rated frequency and other system conditions detailed elsewhere.
The Capacitor Bank, if any, shall be supplied complete with
mounting Steel Rack assembly, Inter-connectors between Units,
Fuses for Unit and Group Protection, Insulators, suitable Earthing Lugs (including Terminal Connectors) and any other material required
to make the Bank complete in all respects for its satisfactory
operation.
All Low Tension Equipment shall be indoor type, free standing
and complete in all respect from over voltage, under voltage and over current protection.
6.2 Mounting Arrangement
The Capacitor Bank, if any, Current Transformer for Unbalance
Protection and the Series Reactor shall be suitable for mounting on
Steel Racks which in turn shall be mounted on a Concrete Plinth with suitable Base frames. The Racks shall be complete with Rack
Insulator and other hardware etc.
7. Control Panels
7.1 Particulars of „Control and Relay Panel‟ for Control of „Power Quality
Restorer‟
7.1.1 The Control Panel, having the Relays for the Control of Power Quality Restorer, shall be installed in the control room of unattended Remote
controlled Traction Sub-station. The Control Panel shall be of vertical
mounting, self supporting steel construction back to back duplex corridor type. The corridor shall be provided with a lockable door at
either end permitting free access to all Instruments, Components,
Wiring, Terminal connections, Test Block etc. Stove enameled
painting shall be done on the Panel. The colour of the Panel shall be „Eau de Nile green‟ conforming to Shade 216 of IS:5-2007, on the
exterior and white on the interior surfaces. The overall height shall
be 2300 mm to match with the height of the existing Transformer and Feeder Control Panels.
7.1.2 The Control Panel shall be fabricated from a frame made of steel
section of 3 mm. thick and covered by door, side cover and top cover made of 2 mm. thick CRCA Steel Sheet. Suitable Cable entries shall
be provided from the bottom of the Control Panel for which suitable
opening shall be provided on the Bottom Plate. The Control Panel
shall be suitable for erection, flush with the concrete floor by evenly spaced grouting Bolts (projecting through the Base Channel of its
frame). The Control Panel, including the Relay housing, shall be
dust, vermin and moisture proof. The overall size of the Control Panel shall be subject to the approval of Railways.
7.1.3 There shall be provision for fixing a 240 Volts suitable Lamp for
interior lighting. The Lamp shall be switched ON/OFF with the help of
a door switch mounted at suitable location inside the Panel.
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7.1.4 The Protective Relays shall be mounted on the Back Panel and shall
be of semi-flush mounting type with back connections and provided
with dust proof covers and Test Plug for Secondary Injection Tests.
7.1.5 The Front Panel shall have the Control Switch, Indication Light
Emitting Diodes (LEDs), Annunciation Label, Alarm Cancellation Push
Button and a Mimic Diagram indicating connections of various equipments.
7.2 Instruments
A Switch Board type semi flush mounted Ammeter, one kVAr Meter
and one Digital Power Factor Meter, of suitable range, shall be
provided for measurement of current and kVAR of Power Quality Restorer and power factor of the TSS on the LV side of the traction
transformer. The instruments shall generally conform to IS 13875
(Part 1-3)-1993, Class A Industrial grade accuracy. It‟s circuits shall be capable of withstanding 20% overload for 8 hours. It will be
subjected to a high voltage test of 2 kV RMS for one minute. The
Instrument shall be with dust-tight case and finished in dull black
enamel.
7.3 A suitable spring return type control switch with pistol grip handle having three positions – „ON/OFF/Neutral‟ shall be provided. The
Switch shall have a sequence device to prevent two successive
movements to the same position. Following indication LEDs shall be provided for indication of circuit breaker:
i) Circuit Breaker „Closed‟ - Red
ii) Circuit Breaker „Open‟ - Green
iii) Circuit Breaker „Auto-trip‟ - Amber iv) Trip circuit „Healthy‟ - Yellow
Low consumption, extra bright, 5 mm dia., light-emitting diodes
(LEDs) shall be used wherever required. LEDs shall be suitably wired
to glow on 110 V, DC supply. LEDs shall be housed in suitable holders with glazed/polished surface to act as reflector. The holders shall be
screwed to the panel from inside.
7.4 A suitable two position (Local/Remote) „Change Over Switch‟ shall be
provided on the Control Panel for operation of Circuit Breaker from Control Panel in „Local‟ mode and from Remote Control Center in
„Remote‟ mode of this Switch.
7.5 Mimic Diagram
7.5.1 The scheme of connections at the Traction Sub-station showing the
Incoming Isolator, Circuit Breaker, Step Down Transformer, Series
Reactor, IGBT or any other superior device, the Capacitor Bank etc. shall be represented by a single line Mimic diagram on the Control
Panel. The colour of the Mimic diagram shall be golden yellow to
shade 356 of IS:5-2007.
Automatic Semaphore Relay shall be incorporated in the Mimic
diagram to indicate the position of the Circuit Breaker.
7.5.2 Open/close position of 25 kV Isolators shall be represented on the Mimic diagram by manually operated Semaphores. Push Buttons and
yellow indication LEDs, as mentioned in Para 7.3 above, shall be
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provided on the Control Panel to monitor the availability of 110 V,
DC supply on the Panel, and the continuity of Trip circuit for the
Circuit Breaker.
7.6 Annunciator
7.6.1 An Annunciation Label, as per Sketch at Appendix-VIII, shall be provided on front side of the Control Panel for Visual Alarm of various
fault conditions.
7.6.2 The Visual Alarm shall be of flasher type i.e. concerned LED shall
flicker and shall not become stable till the alarm is accepted.
7.6.3 The Alarm accepting and Annunciation testing Buttons shall be
mounted on the Control Panel at a convenient height under the
Annunciator Label.
7.6.4 Along with Visual Alarm, there shall be provision for an Audible
Alarm. Audible Alarm Bell shall work with 110 Volts, DC This Bell
shall be mounted inside the Control Panel. The Alarm Bell shall continuously ring when a fault is there and shall not stop ringing till
the alarm is acknowledged. A suitable Disconnection Switch shall be
provided for disconnection of the Bell.
7.7 Remote Operation
7.7.1 The 25 kV Feeding Circuit Breakers connected on primary of Step-down Transformer and fixed HT Capacitor Banks shall normally be
switched in or out by control commands issued by Traction Power
Controller of the Remote Control Centre. These Tele-commands shall be issued with the help of Supervisory Remote Control and Data
Acquisition System, hereafter called SCADA system provided at
Remote Control Centre.
7.7.2 For the purpose of Tele-commands and Tele-Signalling, suitable
Terminals shall be provided on a Terminal Block, which shall be duly
wired for the following:
i) One Tele-signal for supervision of secondary Fuse of Potential Transformer (PT).
ii) One Tele-command for operation of Control of Power Quality
Restorer Equipment Circuit Breaker. iii) Any other Tele-signals required for monitoring the
healthiness of the Transformer, Capacitor Units, IGBT or any
other superior device as recommended by the Tenderer.
7.7.3 Suitable Terminal Blocks, including Testing Terminal shall be mounted conveniently inside the Control Panel. The current rating of the
contacts shall be 30 Amps. continuous at 110 V, DC. The Current
Terminals shall be provided with short circuiting links or other suitable device. The Potential Terminals shall be housed in narrow
recesses of the Moulded Insulation Block to prevent accidental short
circuit. Terminals on the Blocks shall be Stud type crimped terminal or Lugs, securely tightened with Nuts and Spring Washers. AC and
DC Terminals shall be separate. Each Terminal shall be completely
shrouded.
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7.7.4 All Panel wiring shall be done with Switchboard type 1100 V grade
PVC insulated single core stranded tinned annealed Copper Cable.
The AC and DC circuits shall be kept separate.
7.7.5 Suitable space Heaters to operate on 230 V, single phase, AC supply
with „ON‟ and „OFF‟ Switches shall be provided inside the control
panel to prevent condensation of moisture in humid weather.
7.7.6 One combined three pin Switch Plug, 5 Amp. rating shall be provided
inside the Panel for using 230 V Hand Lamp.
7.7.7 Wherever required, only HRC type Cartridge Fuses of appropriate
rating, shall be used in the Control Panel at easily accessible places.
7.8 Control Panel for IGBT or any other Superior Device Control
The Control Equipment for the Control of Power Quality
Restorer Equipment scheme shall be housed in a separate Control
Panel / Control Box, the details of which shall be furnished by the Tenderer along with the offer. The Control Equipment shall be built of
Modular Units to enable easy maintenance and replacement.
8. Current and Potential Transformers
Suitable Current Transformers and Potential Transformers for the
protection of Transformer, Capacitor Bank, if any and IGBT or any
other superior device shall be supplied by the Tenderer. Full technical particulars of such Transformers shall be furnished in the
Tender offer.
9. Protection against Lightning Surges
The Equipment offered shall be adequately protected against
lightning surges. The ratings of Lightning Arresters, required for the equipment offered, shall be clearly indicated in the Tender offer. The
Lightning Arrester shall be Metal Oxide Gapless Type.
For 25 kV system voltage, 42 kV class 10 kA discharge current
Lightning Arrester shall be used. The Lightning Arrester shall be designed to withstand the full energy discharge from the Capacitor
Bank, if any or IGBT based equipment to which it is connected.
10. Earthing
Earthing arrangements shall be provided for each apparatus in
accordance with RDSO Specification No. ETI/PSI/120(7/88) “Code of Practice for Earthing of Power Supply Installation for 25 kV, AC, 50
Hz, single Phase Traction System”. The Earthing arrangement
proposed for the PQR system shall be indicated by the Tenderer.
11. Painting
11.1 Painting of Structure
All steel structures exposed to weather shall be given a priming coat of zinc chromate and two coats of light grey enamel paint as per
Shade 631 of IS:5-2007.
11.2 Painting of Cabinet
The Cabinet shall be given a primers coat of zinc chromate and two
coats of light grey paint as per Shade 631 of IS:5-2007.
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11.3 Painting of Capacitor Tank
The inside surface, in contact with insulation, shall be painted with
suitable anti-rust synthetic enamel primer and two coats of heat resistant, oil insoluble, insulating varnish. The Steel surfaces,
exposed to weather, shall be given a priming coat of zinc chromate
and two coats of light grey paint as per Shade 631 of IS:5-2007.
11.4 Painting of Transformer
All Steel surface which are exposed to weather shall be given one
primer coat of zinc chromate and two coats of light grey paint as per
Shade 631 of IS:5-2007.
12. Fasteners
All Fasteners of 12 mm diameter and less and exposed to
atmosphere shall be of Stainless steel and those above 12 mm dia
shall be preferably be of Stainless steel or Mild steel hot dip galvanised to RDSO‟s Specification No. ETI/OHE/18 (4/84).
13. Testing of Power Quality Restorer Equipment
13.1 General
13.1.1 Once a Purchase order is placed for supply of „Power Quality
Restorer Equipment‟ (PQR) the Design and Drawings shall be
furnished by the successful Tenderer to the Director General
(Traction Installation) / Research Designs & Standards Organisation, Manak Nagar, Lucknow, within the period stipulated in the Purchase
order.
Only after all the Design and Drawings have been approved for Prototype tests and a written advice given to that effect, shall the
successful Tenderer/Manufacturer take up manufacture of the
Prototype of the PQR Equipment. Any change or modification
required by the Director General (Traction Installation) / Research Designs & Standards Organisation, Manak Nagar, Lucknow shall be
incorporated in the Prototype expeditiously, not withstanding
approval having already being given for the Design and Drawings.
Such changes or modifications shall be incorporated in the Drawings
as indicated in Clause 15.5.
13.1.2 Prior to giving a call to the Purchaser/ Director General (TI)/RDSO for inspection and testing of the Prototype, the successful
Tenderer/Manufacturer shall submit a detailed „Test Schedule‟
consisting of Schematic Circuit Diagrams for each of the tests and
the number of days required to complete all the tests at one stretch. Once the Schedule is approved, the tests shall invariably be done
accordingly.
However, during the process of Type testing or even later, the Purchaser reserves the right to conduct any additional test(s) besides
those specified herein on any Equipment/Item, so as to test the
Equipment/Item to their satisfaction or for gaining additional information and knowledge.
In case any dispute or disagreement arises between the successful
Tenderer /Manufacturer and representative of the Purchaser/Director
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General (TI)/RDSO during the process of testing as regards the
procedure for Type tests and/or the interpretation and acceptability
of the results of Type test, it shall be brought to the notice of the Purchaser/Director General (TI)/RDSO as the case may be, whose
decision shall be final and binding.
Only after the Prototype PQR Equipment is complete and ready in each and every respect, shall the successful Tenderer /Manufacturer
give the actual call for the inspection and testing with at least 15
days notice for the purpose.
13.2 This Specification covers PQR system based on IGBT based systems. The Prototype test for the complete system & Main Sub-components
shall be conducted by RDSO at the time of development of first
system.
Note
(i) All Type tests shall be conducted by RDSO on the Power Quality
Restorer Equipment and its Sub-components i.e. Transformer,
Capacitor, Reactor, Control Panel etc. as per the governing
Specifications mentioned in Clause 2.1, including Annexure-B and other relevant latest IS/IEC Specifications.
(ii) PQR system manufacturer shall ensure that maximum number of
functional tests shall be carried out at their premises in the presence of RDSO representative. However only for those tests for
which facilities are not available at Firm‟s premises can be got
done at reputed Government Test Agencies/Institutions and Test Report shall be submitted to RDSO.
(iii) RDSO reserves the right to conduct these tests again whenever
major change in Design or Rating of the system or its Sub-
components is done.
(iv) (a) If some of the Equipment e.g. Current Transformer, Potential
Transformer, High Tension Capacitors, Series Reactors, Step
Down Transformer etc. of PQR system have already been Type tested (for same design & ratings) by RDSO then tests
shall not be repeated.
(b) Routine tests to be conducted by Purchaser at the Firm‟s premises for complete System & Sub-components/Equipment.
(c) Pre-commissioning tests to be done by Purchaser along with
the supplier for each system.
13.3 Pre-commissioning tests
In addition to the above tests, the following tests shall be conducted,
at site, in presence of concerned Railway Authorities to verify the performance of the „Power Quality Restorer Equipment‟ by the
successful Tenderer:-
i) Efficacy of the Discharge Device
The efficacy of the Discharge Device shall be tested through
the test provided in Clause 6 & 7 of IS:13585 (Part 1):1994.
ii) Efficacy of the Shunt Capacitor
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Before connecting the Capacitor Bank, the Power Factor shall
be measured on the 25 kV Busbar continuously for at least 24
hours. After connecting the Capacitor Bank, the Power Factor shall
again be measured, continuously, for at least 24 hours. The
load shall be recorded hourly in each case. The improvement in Power Factor, at different loads, shall be assessed from
these observations.
iii) Rise in Voltage due to Capacitor Bank
At different loads, the voltage at the 25 kV Busbar shall be
recorded with /and without Capacitor Bank. The rise in voltage
due to the Capacitor Bank shall be assessed from these observations.
iv) Efficacy of the Protection System
Tests shall be done to ascertain the effectiveness of the
Protection system. In case of Shunt Capacitor, one of the
Capacitor in one of the limbs shall be short circuited and its
effect shall be observed.
v) Temperature Rise
The Capacitor Bank shall be kept on for 24 hours and the temperature of one Capacitor in each of the limbs shall be
recorded hourly. The temperature of Power Transformers,
Current Transformer, Potential Transformer, IGBTs and other Equipments shall also be observed hourly during this period.
vi) Matching of characteristics of Shunt Capacitor with that of
over-voltage relay. The matching shall be verified.
vii) Harmonic Analysis
The Harmonic Analysis of the Current Waveform as well as of
the Voltage Waveform shall be carried out with and without
The Power Quality Restorer Equipment for a period of 24 hours on a normal working day.
viii) Surge Voltage Measurement
The Surge Voltage shall be measured at the time of switching
on the Capacitor. This shall be done 20 times. The voltage
peak shall not be more than 70 kVp in any case.
ix) Schedule of pre-commissioning tests on the Transformer, IGBT and the balance Equipments shall be mutually agreed upon
between the successful Tenderer and the Purchaser.
13.4 Following additional tests shall be conducted for IGBT based
Equipment as per IEC: 60146-2 (1999), Section-7. List of Tests,
required typically for 400 V, +/- 350A single Panel , single Phase IGBT based „Power Quality Restorer Equipment‟ based on above
applicable guidelines, are as below. The single Panel here is to be
treated as part of the total number of IGBT based panels supplied by the Supplier / Contractor.
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Part (a) Routine tests
Manufacturing process to assure the use of and proper mounting of
correct Sub-assemblies, Components, Wiring/Cabling and their
Rouging, Ferruling, use of correct Lugs and their tightness, etc.
(i) Visual Inspections : Components Data/Ratings etc. as per General Arrangement inclusive of
Auxiliary Devices (Section 7.3.1 and 2)
(ii) Wiring checks : As per the Wiring Table/Schematic,
Part of above only. (iii) Insulation test : By using 1000 V Megger (Section 7.3.3)
(iv) Basic functional tests which include Power up sequence,
Control Logic Correctness & Protective Control Circuit Functionality Check at given input voltage of 400 V and Final
Pulse Delivery from Controller but Hardware Pulse Delivery to
IGBT‟s with held (Section 7.3.5). (v) IGBT Pulse Delivery and checking the zero current mode for
IGBT based Power Quality Restorer Equipment (Section 7.3.5)
(vi) Checking the Dynamic Response with the external current
command circuit (Section 7.3.5). (vii) Rated output test of the Panel at rated voltage (Section 7.3.6)
Part (b) Type tests:
i) HV/Insulation Test (Section 7.3.3)
ii) Heat Run Test for 48 Hours or one hour after the temperature
rise is steady whichever is earlier for 400 V, 350 A (24 hrs or one hour after the temperature rise is steady which ever is
earlier) for capacitive mode and 24 hrs or one hour after the
temperature rise is steady which ever is earlier for Inductive
mode and Temperature rise (Section 7.3.8). iii) Checking Rated output of each Panel by external current
command delivery and checking of actual IGBT based Power
Quality Restorer Equipment. Current following the same in both capacitive and inductive mode (Section 7.3.6).
iv) Input current distortion check for Distortion Factor close to
unity at 400 V, 350 A for both, Capacitive and Inductive modes (Section 7.3.10).
v) Any other tests, if agreed, between the manufacturer and the
customer.
Part(C) Optional Tests (to be agreed before the supply)
(i) Dynamics +350 A to –350 A at 400 V Rated Voltage
(Dynamics not specified by IEC. Could be as per section 7.3.23 as additional test)
(ii) Heat run of each panel for full load for 2 hrs. (one hour in
capacitive mode and one hour in inductive mode). Not specified by IEC.
(iii) Visual input current distortion check w.r.t. to given waveforms
(Distortion factor close to unity) (section 7.3.10).
(iv) Power Factor Measurement Prior and post installation of PQR system.
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14.0 Capitalisation of losses & benefits
14.1 Benefits
Savings by any reduction in Maximum Demand, reduced losses in the
Traction transformer due to Power Factor improvement and avoidance of low power factor penalty where applicable, are to be
capitalised as indicated below:
i) Losses in all Capacitor Bank, including Fixed / Variable,
Dynamic etc.
ii) Switching losses in IGBTs or any other type of Switches that are proposed by the Tenderer,
iii) Losses in the Transformers used for the Compensation Scheme.
iv) Losses in the Reactors. v) Energy consumption for Ventilation (if any)
14.2 The losses of the Capacitor Bank (if any) shall include losses per
Capacitor unit (including Fuses and Discharge Device) multiplied by
the number of units in the Capacitor bank. The overall losses of a Capacitor unit shall not be more than 0.20 Watt/kVAR.
14.3 The benefits derived by installation of Power Quality Restorer
Equipment shall be compared against capitalisation of its cost of
procurement, installation and commissioning, Annual Maintenance Contract (AMC) charges, to obtain a Capitalised Cost, detailed
calculations for which shall be submitted by the Tenderer along with
the offer using the method given in Appendix-X. The Tenderer shall for this purpose clearly indicate the losses of the Power Quality
Restorer Equipment and expected benefits in the format given in
Appendix IX.
The Tenderer shall submit detailed calculations and the proof of
Device/Equipment data to support the calculations of losses/benefits
of Power Quality Restorer Equipment as provided by him.
15.0 Technical Data and Drawings
15.1 The Tenderer shall furnish guaranteed performance Data, Technical
and other particulars for the Equipments offered in the proforma
attached as Annexure-A. The Tenderer shall also furnish the complete protection scheme for the Power Quality Restorer
Equipment and Layout Drawings with Cross Sectional Details for the
Power Quality Restorer Equipment along with their offer.
Technical details of the protection employed, together with detailed calculation for the ratings of the Equipment shall also be furnished
with the Tender offer.
The information furnished in Schedule of Guaranteed Technical Performance, Data and other Particulars shall be complete in all
respects.
If there is any entry like “shall be furnished later” or blanks are left against any item, the Tender is not likely to be considered as such
omissions cause delay in finalising the Tender.
15.2 The Tenderer shall specifically indicate in a statement attached with
their offer, the compliance with each clause and sub-clause of this Specification. If any vague remarks on any clause or sub-clause of
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this Specification is given by the Tenderer, then the tender submitted
by him is not likely to be considered. A separate deviation statement
shall be furnished with the offer drawing attention to the clause(s) where the tenderer seeks deviation giving detailed
remarks/justification thereof. If there are no deviation, a „NIL‟
statement shall be furnished.
15.3 The Tenderer shall furnish the following calculations with their offer.
i) Detailed calculations for rating of Capacitor Bank, Series
Reactor, Inrush Current, Transient Over-voltage, Parallel and
Series Resonant Frequencies. ii) Calculations for Protection scheme offered.
iii) Calculations for Design of Supporting Frame, Fixing
Arrangement and Foundation.
15.4 The following Drawings shall be furnished as per Indian Railway Standard (in sizes of 210 mm x 297 mm or any integral multiple
thereof):-
a) Outline General Arrangement Drawing giving the overall
dimensions of the Capacitor Bank installation. b) Schematic Circuit Diagram (with Description of function and
working of each Component) and Wiring Diagram
c) Arrangement of Capacitor Bank, IGBT, Transformer, Series Reactor, Circuit Breaker, Isolator, Lightning Arrester, Current
and Potential Transformers.
d) Arrangement of Core Winding and Magnetic path of Series Reactor and Transformer.
e) General Arrangement of Circuit Breaker, showing mounting
arrangement and overall dimensions
15.5 The successful Tenderer shall be required to submit for approval the
following Detailed Dimensioned Drawings as per India Railway standard (in sizes of 210 mm x 297 mm) or any integral multiple
thereof in latest version of Auto CAD.
a) Outline General Arrangement Drawing of the Power Quality Restorer Equipment installation indicating necessary
dimensions, clearances and location of equipment/fittings (all
the 3 views). b) Internal Arrangement of Series Reactor and Transformer
including cross-sectional views in both Plan and Elevation.
c) Schematic Circuit Diagram (with description of Function and
working of each component) and Wiring Diagram. d) Supporting Frame with details of Fixing Arrangement and
Foundations along with calculation for their Design.
15.6 After approval of Design and Drawings by the Director General (TI),
RDSO, Lucknow the Tenderer shall manufacture an acceptable prototype of Power Quality Restorer Equipment as per approved
Drawings. The Prototype inspection shall be carried out by the
representative of Director General (TI), RDSO. The Bulk
manufacture shall be taken up only after approval of prototype by Director General (TI), RDSO, Lucknow.
15.7 Routine inspection shall be carried out by the representatives of
Indian Railways at the manufacturer‟s works.
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15.8 After approval, six copies of Approved Drawings along with two sets
of Reproducible Prints shall be supplied to each consignee(s).
Besides, two copies of Drawings along with one set of reproducible prints shall be supplied to Director General (Traction Installation),
Research Designs and Standards Organisation, Lucknow (India).
15.9 The successful Tenderer shall supply 3 copies of Instruction/Maintenance Manual of the Power Quality Restorer
Equipment installation and its Fittings and Accessories, to each
Consignee(s) and 2 copies to Director General, Traction Installation,
Research Designs and Standards Organisation, Manaknagar, Lucknow-226011 (India).
16. Additional particulars
The Tenderer shall visit the Traction Sub-station location, if necessary, and collect any additional data/details required for the
design of the Power Quality Restorer Equipment and the Series
Reactor / Surge Suppression Equipment. It would be the
responsibility of the Tenderer to visualise the problems and understand the system conditions before evolving a suitable Design.
17. Erection, Testing and Commissioning
The Power Quality Restorer Equipment installation shall be erected by
the successful Tenderer under the supervision of a competent engineer of the successful Tenderer/Manufacturer/ Supplier. The
Power Quality Restorer Equipment installation shall be subjected to
the specified proving/pre-commissioning tests by the Railway engineer at site and with which the successful
Tenderer/Manufacturer/Supplier shall also be fully associated. For
this purpose prior intimation regarding the date and location of the
tests shall be given by the purchaser to the successful tenderer/manufacturer/supplier.
18. Spare parts, Catalog & Support commitment
The Tenderer shall furnish along with his offer a list of spares (with
cost), recommended by him for maintenance of Power Quality Restorer Equipment installation for a period of 2 years.
19. Training of Indian Railways‟ Engineers
The offer shall include the training of two engineers and four
technicians of the Indian Railways free of cost at the manufacturer‟s
Works in India or abroad and at the Traction Sub-station of a Railway system or other public utility where Power Quality Restorer
Equipment of similar/identical design are in operation. The total
duration of training for each Engineer/Technician shall be 4 weeks of which approximately 2 weeks shall be at the manufacturer Works
and 2 weeks on a Railway System or public utility. The cost of travel
to the country of manufacture and back shall be borne by the Indian Railways.
***********
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ANNEXURE-A
SCHEDULE OF GUARANTEED PERFORMANCE
TECHNICAL AND OTHER PARTICULARS
A- SHUNT CAPACITOR
S.No. Description Unit of
measurement
1. Maker‟s name
2. Country of manufacture
3. Manufacturer‟s type (Designation)
4. Location of capacitor bank (Outdoor/Indoor)
5. Nominal Rated System Voltage kV
6. Rated Voltage of Capacitor Unit
IS-13925(Pt.1):1998
kV
7. Maximum Voltage (RMS), which the Capacitor unit can
withstand continuously.
kV
8. Rated Frequency Hz
9. No. of Phases No.
10. Upper limit of Temperature category 0C
11. Capacity of individual unit at Rated Voltage of the unit kVAR
12. i) Continuous current rating of individual Capacitor Unit A
ii) Maximum inrush current at the instant of Switching A
13. Basic insulation level of unit
a) Power Frequency Voltage Withstand b) 1.2/50 micro-second impulse withstand voltage
kV(rms) kV(peak)
14. Basic Insulation Level of complete Capacitor Bank:
a) Power Frequency Voltage Withstand
b) 1.2/50 micro-second Impulse Withstand Voltage
kV(rms)
kV(peak)
15. Transient current withstand capacity of each unit kA
16. Constructional details of Capacitor unit
i) Dielectric Material
ii) Foil Material & Thickness iii) Impregnating liquid used and its properties
17. Total Maximum losses per kVAR/unit at rated voltage
and at 50 Hz
Watts/kVAR
18. Capacitor Unit i) No of Elements in Series
ii) No. of Parallel Paths
iii) Capacitance of each unit.
No.
No.
Micro farad
19. Capacitor Bank i) No. of Series Groups
ii) No. of Parallel Units in each group
iii) Capacitance of the Bank
No.
No.
Micro farad
20. Internal Fuse
i) Type of Internal Fuse Elements of Capacitor Unit
ii) Length of Fuse element
iii) Cross section of fuse element iv) Circumference of fuse element
v) I2t characteristics
-
mm
Sq.mm mm
-
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vi) Time Factor(t) of Internal Fuse Element Second (under
Maximum
energy condition)
Second (under
Minimum
energy condition)
21. Reference to the Time/ Current characteristics of the
Fuse element
22. Discharge device i) Type
ii) Location
iii) Time interval between De-energisation and Re-energisation
iv) Residual Voltage after an interval of 10 minutes
of De-energisation
Minutes
Volts.
23. Bushings i) Maker‟s Name
ii) Governing Specification
iii) Wet-one minute Power Frequency Voltage withstand
iv) Impulse Voltage Withstand 1.2/50 microsecond
Full Wave v) Creepage Distance in Air.
vi) No. of Bushings in each unit
kV(rms) kV(peak)
mm
No.
24. Overall dimensions
i) Capacitor unit ii) Complete Capacitor Bank
mm. mm.
25. Weight per unit kg
26. Weight of the Complete Bank kg
B – CONTROL & RELAY PANEL
1. Name of manufacturer and address
2. Overall Dimensions
i) Length ii) Width
iii) Height
mm mm
mm
3. i) Colour of the Panel
ii) Colour of the Mimic
4. Details of Switches provided and their make
5. Annunciations provided
6. Size of Wires used for:
i) Control Circuit ii) Indication Circuit
iii) General Wiring
iv) PT and CT Circuits
7. Method of Cable Entry
8. Details of Instruments, if any provided
Specification for Power Quality Restorer for AC
Traction System
Effective from : 01.01.2015
Specification No. TI/SPC/PSI/PQR/0140 (12/2014)
28
C – PROTECTIVE RELAYS OF CAPACITOR BANK
1. Instantaneous over current Relay
i) Type and Make of Relays offered
ii) Setting range in current available
2. Over Current i) Type and Make of Relays offered
ii) Setting range in current available for Over
Current Relays.
3. Over-Voltage Protection
i) Type and Make of Relay offered
ii) Setting range available
4. Unbalance Protection i) Whether voltage operated or current
operated Relays are used.
ii) Setting Range available in the Relays. iii) Calculations to show the No. of Capacitor
Units which when fail shall produce the rated
Over voltage on other Capacitor Units and
the setting range available in the relay offered suits the same, shall be enclosed.
iv) How provision of Alarm in the case of failure
of one or two Capacitor Units has been achieved.
v) Details (Type and Make and setting range) of
the Time Delay Relay. vi) Calculations to show that co-ordination
between the operation of individual fuses to
isolate faulty units and the unbalance
protection exists, should be appended.
5. The required capacity of Current Transformer and
Potential Transformer in VA
NOTE – The Tender shall be complete with three sets (one with each copy) of technical Literature and Pamphlets of the Relay used.
D – PROTECTION OF 25kV / 433 V TRANSFORMER
1. The Tenderer shall furnish details of Protection proposed for the 25kV/ 400V Transformer
E – PROTECTION OF IGBT
The Tenderer shall furnish details of Protection
proposed for the IGBTs.
F –REACTOR IN SERIES WITH LC CIRCUIT
1. 1. Name of Manufacture
2. Governing Specification
3. Type of Reactor
4. Rated Current and Voltage 5. Rated frequency
6. Rated impedance
Amps/Volts Hz
Ohms
Specification for Power Quality Restorer for AC
Traction System
Effective from : 01.01.2015
Specification No. TI/SPC/PSI/PQR/0140 (12/2014)
29
7. Inductance of Series Reactor
8. Resonance Frequency of the system, including
Shunt Capacitor and Series Reactor. (Details of calculation shall be enclosed )
9. Value of the Peak Surge voltage generated at
the time of switching in of Shunt Capacitor
(calculations shall be appended) 10.Short Circuit Rating for 3 seconds
11.Overall Dimensions of the Series Reactor
12.Total weight of the Series Reactor 13.a) No. of Tappings on the Series Reactor
b) Minimum Inductance
c) Maximum Inductance
mH
Hz
kV
kA
mm
kg No.
mH
mH
NOTE: S.No. (4) to (13) above shall be furnished for each branch setely. In case Resistance & Capacitance circuit or any other surge suppression
circuit is proposed to be used, complete details thereof shall be
furnished.
G-IGBT
1. Maker‟s name
2. Country of manufacture
3. Manufacturer‟s type designation
4. Standard specification on which performance
data are based
5. Device configuration
6. Type of device PT/NPT/SPT/Trench
7. Collector Emitter Voltage V
8. Gate Emitter Voltage V
9. Collector current at continuous Tc of 25 deg.
Celsius
A
10. Collector current at continuous Tc of 80 deg.
Celsius
A
11. Operating temperature oC V
12. Isolation voltage V
13. Max. collector Emitter Saturation Voltage V
14. Total gate charge Qge nC
15. Turn-on Delay Time td(on) s
16. Rise Time tr s
17. Turn-off delay time td (off) s
18. Fall time tf s
19. Turn-on switching energy Eon s
20. Turn-on switching energy Eoff mJ
21. Forward Voltage VF mJ
22. Reverse recovery current Irrm V
23. Reverse recovery charge Qrr C
24. Reverse recovery time trr s
25. Reverse recovery energy Erec mJ
26. Module stray inductance nH
27. Cumulative Thermal Resistance (Rj-c) of the device
oC/W
28. Preferred type of cooling W
Specification for Power Quality Restorer for AC
Traction System
Effective from : 01.01.2015
Specification No. TI/SPC/PSI/PQR/0140 (12/2014)
30
29. Maximum operating and storage temperature oC
30. Mounting force, terminals as well as modules Nm
31 Alternatively complete data sheet of the IGBT
from the manufacturer
32. Conduction Loss
33. Switching Loss
34. Switching Frequency
H- Step Down transformer(25kV/433V)
1. Name of the manufacturer
2. Country of origin
3. Standard specification on which the performance
data are based
4. Continuous rating for specified cooling,
temperature rise and ambient temperature
kVA
5. Rated temperature rise under normal operating
conditions over an ambient of 45o
a) of oil by thermometer
b) of winding by resistance
oC oC
6. Rated primary voltage kV
7. Rated secondary voltage kV
8. Exciting current ref erred to HV and at 50 Hz at
100% rated voltage.
A
9. Power factor of excitation current at 100% rated voltage
10. Iron loss at 50 Hz, and 100% rated voltage W+%
11. Coppr loss at (75o) at rated load W+%
12. Total loss W+%
13. Resistance voltage (at 75o) at full-load of a) HV winding
b) LV winding
(All values shall be refer red to the HV)
V+%
V+%
14. Reactance voltage (at 75o) at full load (referred
to the HV)
V+%
15. Impedance voltage (at 750C) at full load (referred
to the HV)
V+%
16. Resistance of HV winding (at 750C)
Ohms
17. Resistance of LV winding (at 750 C) Ohms
18. Regulation at full load (at 750 C)at 0, 0.1 power
factor(leading) at
100 % load 75% load
50% load
% %
%
19. Withstand time without injury with dead short
circuit at the terminal
Seconds
20. „Ideal heating time‟ or the thermal time constant
of windings
Minutes
21. a) Type of core b) Flux density in the core at rated voltage and
50 Hz.
Tesla
mm
Specification for Power Quality Restorer for AC
Traction System
Effective from : 01.01.2015
Specification No. TI/SPC/PSI/PQR/0140 (12/2014)
31
c) Thickness of iron stampings
d) Insulation between the core laminations
(material)
22. a) Type of windings
b) Size of conductors
c) Current density in: i) HV winding
ii) LV winding
d) Insulation on the copper conductor e) Insulation withstand strength of windings with
1.2/50 μs wave: HV
i) Impulse full wave
ii) Impulse chopped wave f) Applied voltage test – LV
g) Induced voltage test –HV
h) Min. flashover distance to earth through oil between –
i) LV and core
ii) HV and yoke i) Estimated switching surge withstand
HV LV
mm2
A / mm2
A / mm2
kV(p)
kV(p) kV(rms)
kV(rms)
mm
mm
kV(p)
23. Tap changer, if provided –
a) whether on primary or secondary side
b) type of tap changer c) number of plus taps and minus taps
d) Volt per steps
V
24.
Bushings:
Primary
HV end.
Primary
earthed
Secondary
side
a) Name of manufacturer
b) Country of origin
c) Standard specification on which the
performance data are based
d) Type of bushing
e) 1.2/50 s Impulse withstand
kV(p)
(full wave)
f) One minute dry power frequency
withstand kV (rms)
g) One minute wet power frequency
withstand kV(rms)
h) Puncture voltage kV(rms)
25. Net weight of core kg.
26. Net weight of copper
a) HV b) LV
kg. kg.
27. Net untanking weight of core, frame and oils kg.
28. Net weight of insulating oil kg.
29. Volume of insulating oil Litres
30. Total weight of transformer-less oil Tonnes
Specification for Power Quality Restorer for AC
Traction System
Effective from : 01.01.2015
Specification No. TI/SPC/PSI/PQR/0140 (12/2014)
32
31. Dimensions of the assembled transformer
a) Under base to the top most point
b) Overall breadth c) Overall length
d) Minimum thickness of plate
Tank – sides
Tank – bottom Tank - cover
mm
mm mm
mm
mm mm
I – CONTROL OF IGBTs
The tenderer shall furnish full technical particulars of the control equipment
used for the control of IGBTs.
J – SURGE ARRESTORS
The tenderer shall furnish full technical particulars of the surge arrestors
offered.
K - CAPACITOR USED IN THE VOLTAGE SOURCE INVERTOR
The tenderer shall furnish full technical particulars of the Capacitor used in
the Voltage Source Invertor offered.
Specification for Power Quality Restorer for AC
Traction System
Effective from : 01.01.2015
Specification No. TI/SPC/PSI/PQR/0140 (12/2014)
33
ANNEXURE-B
Associated specifications to Power Quality Restorer Equipment
i IS : 5-1994 Colour for ready mixed Paints and enamels
ii IS : 513-1994 Cold rolled low carbon steel sheets and strips
iii IS : 800-1984 Code of practice for use of structural steel in
general building construction
iv IS : 1554 : (Pt.2) PVC insulated (heavy duty) electric cable for working voltages from 3.3kVupto and
including 11 kV.
v IS : 2026 (all parts) Power transformers
vi IS : 2099-1986 Bushing for alternating voltages above 1000 volts
viii IS : 3070-1986: (Pt.I) Surge arrestor for a.c. systems, non-linear
resistor type
ix IS : 3231(all parts) Electrical relays for power system protection
x IS : 3700(all parts) Essential ratings and characteristics of semi-
conductor devices.
xi IS : 5553-1990:(Pt.II) Series reactors
xii IS : 11298-1991:
(Pt.3/Sec.1)
Specification for plastic films for electrical
purposes -polypropylene film for capacitors
xiii IS : 13947-2 Air circuit breakers
xiv IS : 12672-1989 Internal fuse and internal over pressure
disconnectors for shunt capacitors
xv IEC-60871-1 Shunt capacitors for a.c. systems having a
rated voltage above 1000 V.
xvi IEC-60871-2 Shunt capacitors for a.c. systems having a
rated voltage above 1000 V (Endurance
testing).
xx RDSO Specification No.: ETI/OHE/13(4/84)
With A&C slip No.1 to 3
Specification for hot dip zinc galvanization
xxi RDSO Specification No.: ETI/OHE/18(4/84)
With A&C slip No.1to 4
Specification for steel and stainless steel, nuts and washers steel bolts
xxii RDSO Specification No.:
ETI/PSI/65(1/97) With A&C slip No.1 to 2
Specification for Control and relay panel.
xxiii RDSO Specification No.:
TI/SPC/PSI/CB/0000
Specification for Outdoor circuit breakers for
Railway ac Traction substations.
xxiv
RDSO Specification No.: ETI/PSI/120 (7/88)
Code of practice for earthing of power supply installation for 25 kV a.c., 50 Hz single phase
traction system.
Specification for Power Quality Restorer for AC
Traction System
Effective from : 01.01.2015
Specification No. TI/SPC/PSI/PQR/0140 (12/2014)
34
APPENDIX – I
RELATED EQUIPMENTS AT TRACTION SUB-STATIONS
1.1 Traction Power Transformer
Two Nos. 12.5 MVA, 132/25 kV, with off load Tap-changing
gear having tappings from (+) 10% to (–) 15 % in steps of 5% and
an impedance of 10 to 12.5%. The Transformers are designed to carry short time overloads of 50% for 15 minutes and 100% for 5
minutes.
OR
Two Nos. 21.6 MVA, 220/25 kV, 132/25 kV, 110/25 kV, 66/25kV with off-circuit tappings from (+) 10% to (–) 15% in steps
of 5%. Percentage impedance voltage at 21.6 MVA base is
(12.0±0.5)% at the Principal Tap position. The Transformers are
designed for non-cumulative overload capacity, after it has reached steady state temperature on continuous operation with over load of
50% for 15 minutes and 100% for 5 minutes.
1.2 25 kV Transformer & Feeder Circuit Breaker
SF6 gas/Vacuum Circuit Breaker, 550 MVA, 1600 amps.
1.3 25 kV Potential Transformer
Ratio 25 kV/110 V, Burden 100 VA, Accuracy Class 3P and Rated
Voltage Factor 1.2.
1.4 25 kV Current Transformer
Ratio 1000 – 500/5A or 1500 - 750/5A, Accuracy Class 5p, Accuracy
Limit Factor 15.
1.5 25 kV Isolator
Air Break, Single/Double Pole (630/800/1250 Amps.)
1.6 42 kV Lightning Arrestor
Non linear Metal Oxide Gapless type, Nominal Discharge current 10
kA (8/20 Wave). Maximum Discharge Voltage at Nominal Discharge
Current 125 kVp.
Specification for Power Quality Restorer for AC
Traction System
Effective from : 01.01.2015
Specification No. TI/SPC/PSI/PQR/0140 (12/2014)
35
APPENDIX – II
GENERAL SCHEME OF SUPPLY FOR 25 kV, 50 Hz, SINGLE PHASE TRACTION SYSTEM
Specification for Power Quality Restorer for AC
Traction System
Effective from : 01.01.2015
Specification No. TI/SPC/PSI/PQR/0140 (12/2014)
36
APPENDIX- III A
Specification for Power Quality Restorer for AC
Traction System
Effective from : 01.01.2015
Specification No. TI/SPC/PSI/PQR/0140 (12/2014)
37
APPENDIX- III B
Specification for Power Quality Restorer for AC
Traction System
Effective from : 01.01.2015
Specification No. TI/SPC/PSI/PQR/0140 (12/2014)
38
APPENDIX – III C
INFORMATION FURNISHED BY RAILWAYS (In terms of Para 4.8.1)
3.1 Traction Sub-station location : __
3.2 Transformer Capacity : __ MVA
3.3 Transformer Impedance : __%, angle__degrees
3.4 Details of existing Capacitor Bank, if any : __ KVAr
3.5 Average Power Factor, as obtaining : __
3.6 Typical Maximum Demand, as existing : __ kVA
3.7 Prevalent Average monthly Energy consumption : __ kWH
3.8 Contract Demand : __ kVA
3.9 Tariff - Fixed Charge : Rs.__per recorded
MD kVA
- Energy Charge : Rs.__ per KWh
- Penalty for exceeding CD : Rs.__ per KWh
- Surcharge for low Power Factor:
3.10 Typical Daily Load Cycle
Maximum Demand
kVA
120%
of CD
>100 upto
120%
>70 upto
100%
>40 upto
70%
40%
Total
Hours per day
24
Specification for Power Quality Restorer for AC
Traction System
Effective from : 01.01.2015
Specification No. TI/SPC/PSI/PQR/0140 (12/2014)
39
APPENDIX – IV
Specification for Power Quality Restorer for AC
Traction System
Effective from : 01.01.2015
Specification No. TI/SPC/PSI/PQR/0140 (12/2014)
40
APPENDIX – V
SCHEMATIC DIAGRAM FOR THE PROTECTION OF TRACTION TRANSFORMERS & OHE
Specification for Power Quality Restorer for AC
Traction System
Effective from : 01.01.2015
Specification No. TI/SPC/PSI/PQR/0140 (12/2014)
41
APPENDIX- VI
Specification for Power Quality Restorer for AC
Traction System
Effective from : 01.01.2015
Specification No. TI/SPC/PSI/PQR/0140 (12/2014)
42
APPENDIX- VII
Specification for Power Quality Restorer for AC
Traction System
Effective from : 01.01.2015
Specification No. TI/SPC/PSI/PQR/0140 (12/2014)
43
APPENDIX- VIII
BENEFIT/LOSS INFORMATION TO BE SUBMITTED BY THE TENDERER
(in terms of Para 14.3)
Before
Compensation
(As given by Railways)
(1)
Maximum
Demand
(KVA)
(2)
120%
of CD
(3)
>100%
upto
120% (4)
>70%
upto
100% (5)
>40%
upto
70% (6)
40%
(7)
Total
(8)
Hours per day
After
compensation
MD in KVA
Average PF**
Analysis of
Losses
Capacitor
Bank losses KW (+)
Switching
losses KW (+)
Reduction in
Losses in
Traction Sub-station
Transformer
after compensation
KW (-)
Losses in LT
Transformer & Reactor
KW(+)
Ventilation
Power KW(+)
Net Loss
KWh (+)
Remark NB1 NB2 NB3 NB4 NB5
** Average Power Factor over any period of time
= MWHr consumed over that period
MVAHr consumed over that period
NB1 – Calculation of net loss shall be done for 120% of CD
NB2 – Calculation of net loss shall be done for 110% of CD
NB3 – Calculation of net loss shall be done for 85 % of CD
NB4 – Calculation of net loss shall be done for 55 % of CD NB5 – Calculation of net loss shall be done for 20 % of CD
Specification for Power Quality Restorer for AC
Traction System
Effective from : 01.01.2015
Specification No. TI/SPC/PSI/PQR/0140 (12/2014)
44
APPENDIX-IX
METHOD FOR CALCULATION OF CAPITALISED COST
1.0 Data for calculation of Capitalised Cost
1.1 Net loss “L” in KWh per day as per information furnished by Tenderer
in Appendix VIII, Col.8.
1.2 Cost of procurement, installation & commissioning of Power Quality Restorer Equipment including construction of covered area for
housing indoor equipment as quoted by Tenderer: Rs “Y”
1.3 AMC charges per annum as quoted by Tenderer: Rs “X”
1.4 Period of capitalisation assumed: 15 years
1.5 Discount rate of 7% assumed for calculation of Net Present Value of
Benefits and Costs
2.0 Calculation of Capitalised Cost
2.1 If the monthly saving in fixed charges by reduction in MD arising of
the installation of Power Quality Restorer Equipment is M, then the
capitalised benefit B1 shall be given by:
B1=(12*M)[(1.07)15-1] = (12*M)*9.107 0.07(1.07)15
2.2 If the monthly saving in low Power Factor penalty charges arising of
installation of Power Quality Restorer Equipment is P, then the
capitalised benefit B2 shall be given by:
B2=(12*P)[(1.07)15-1] = (12*P)*9.107
0.07(1.07)15
2.3 If the monthly cost in Energy charges for net losses of L KWh/day is Cm1, then the capitalised cost C1 shall be given by:
C1=Cm1*12*[(1.07)15-1] = (12*Cm1)*9.107
0.07(1.07)15
2.4 The capitalised cost C2 of AMC charges shall be given by:
C2= X * [(1.07)15-1] = (X)*9.107
0.07(1.07)15
2.5 Then the total capitalized cost C of Power Quality Restorer Equipment
shall be given by:
C= Y +C1+ C2 – B1-B2