tender number:6000008765 - spmcilspmhoshangabad.spmcil.com/uploaddocument/pcc sec... · 2017. 7....

Tender Num ber:6000008765

Regd. Office:-16th Floor, Jawahar Vyapar Bhawan, Janpath, New Delhi-110001

Sec07.1

Amended - Section VII:Technical Specifications

DESIGN, SUPPLY, ERECTION, TESTING AND COMMISSIONING OF POWER DISTRIBUTION CENTER AND MOTOR CONTROL CENTER ON TURNKEY BASIS

Design, Engineering & Manufacture, Supply, Installation, Testing and Commissioning of Following and removal of old panels.

Schedule no. 1. : 2 quantity

(A) 415 V, 3 phase, TP, 50 Hz PCC panel , ISV A

(B) 415 V, 3 phase, TP, 50 Hz PCC panel , ISV B

Schedule no. 2

415 V, 3 phase, TP, 50 Hz MCC panel , WTP clear water pump room

Schedule no. 3 : 2 quantity

(A) 415 V, 3 phase, TP, 50 Hz MCC panel , WTP motor room

(B) 415 V, 3 phase, TP, 50 Hz MCC panel , WTP blower room

Schedule no. 4

415 V, 3 phase, TP, 50 Hz MCC panel , ETP vacuum drybed room

Schedule no. 5

415 V, 3 phase, TP, 50 Hz PMCC panel , Intake well

NOTE : KINDLY QUOTED RATE AS PER SECTION-VII OF TECHNICAL SPECIFICATION

Codes and Standards to be followed 1. All equipment and materials to be furnished under this specification shall be designed

manufactured and tested in accordance with the latest revisions of the relevant latest Indian Standard (IS).

2. The electrical installation shall meet the requirement of Indian Electricity Act, 1910 and Indian Electricity Rules 1956, applicable section of the latest revision of the relevant IS Code of Practice, The equipment shall comply with the requirements of latest revision of following standards issued by BIS (Bureau of Indian standards) unless otherwise specified.

IS: 1248 Direct acting electrical indicating instruments IS : 2705 Current transformers IS : 3231 Electrical relays for power systems protection. IS : 5578 Guide for marking of insulated conductor IS : 6005 Code of practice of Phosphating of iron and steel. IS : 8623 Factory built assemblies of switchgear and control gear for voltages up to and including 1000 V AC and 1200 IS: 11353 Guide for uniform system marking and identification of conductors and apparatus terminals. IS: 13703 Low voltage fuses. IS: 13947 L V Switchgear and control gear. (Part-l to Part-5) IEC : 60947-4-2 for soft starters ,and tested as per CE/UL In case Indian standards are not available for any equipment, standards issued by IEC/BS /VDE/ IEEE/ NEMA or equivalent agency shall be applicable.



Sec07.2

S.No. Description Qty.

1 ACB,FP,800A,MDO, Microprocessor based , Breaking Capacity =50KA 2no

2

ACB,FP,800A, MDO, Microprocessor based Bus coupler Breaking Capacity =50KA

1no

3 MCCB,TP,400A, MICROPROCESSOR BASED with ROM extended with LSIG 6no

4 MCCB,TP,100A, Thermal Magnetic , Ics=100% Icu , Breaking Capacity =50KA 2no


7 Cu. Bus Bar,1250A,TPN 1set 8 Dig MFM 2 sets

1 SCOPE OF WORK:

Supply, design, fabrication, transportation to site, assembly, interconnections, erection, testing and commissioning of the Power control center and Motor control center and replacement of old panels at various locations of SPM, including laying, installation and commissioning of copper cable provided by SPM in underground trenches and inter connection with the existing cables. If any civil work if required for installation of panel and cable laying shall also be in scope of the vendor. It is recommended that interested vendors may visit the site to quantity actual work to be done at site.

Power panels should be confirming to IS-8623/1993 amended up to date and it should be as per relevant statutory regulations/guide lines and I.E rules also. Said panel should comprise of A.C.B and M.C.C.Bs, MCB, Soft starter and MPCB etc. as listed below and the panel should be complete in all aspects and ready for operation. GA drawing is indicative only; ammeter /Voltmeter shown in all outgoings are not required, only MFM is required in incomings

2 SUPPLY:

Brief List of BOM to be provide with each panels followed by detail specification

1. A.415 V, 3 phase, TP, 50 Hz PCC panel , ISV A


1

ACB,FP,2500A,MDO, Microprocessor based with UV release Breaking Capacity =50KA ,

2no

2

ACB,FP,2500A, MDO, Microprocessor based Bus coupler Breaking Capacity =50KA

1no

3

ACB,FP,800A, MDO, Microprocessor based Breaking Capacity =50KA

1no

4 MCCB,TP,400A,MICROPROCESSOR BASED with ROM extended with LSIG 6no

5 MCCB,TP,250A,Thermal Magnetic , Ics=100% Icu , Breaking Capacity =50KA 6no




9 Cu. Bus Bar,1600A, TPN 1set 10 Dig MFM(A,V,F,EM) 2 Sets

B.415 V, 3 phase, TP, 50 Hz PCC panel , ISV B


Sec07.3





3 MPCB +12A,AC3 Contactor+ thermal OLR For 3HP Motors 5no

4 MPCB + 12A,AC3 Contactor + thermal OLR For 5HP Motors 5no

All Contactor Ratings ,12A ,AC3 duty, 230 V AC coil 10 no

5 Push Button and Indication for on off ,INDICATING LAMPS 20no

6 Cu. Bus Bar,200A,TPN 1set

7 Dig MFM(A,V,F,EM) 1set

S.No. Description Qty. 1 MCCB,TP,400A, MICROPROCESSOR BASED with ROM extended with LSIG 1no



4

Complete Soft Starter for operation of backwash pump at Temperature 50 deg Celsius, Rating 45KW,150A, Tested and manufactured as per IEC 60947

2no


6 Dig MFM 1set



2 MCCB,TP,125A, Thermal Magnetic , Ics=100% Icu , Breaking Capacity =50KA 2 Nos

3

Complete Soft Starter for operation of vacuum pump at Temperature 50 deg Celsius ,Rating 75KW, 250A , Tested and manufactured as per IEC 60947

2no

4 MPCB + AC3,Contactor+ thermal OLR For 5HP Motors 4no

5 MPCB + AC3,Contactor+thermal OLR For 7.5HP Motors 4no


7 Dig MFM 1set

2. 415 V, 3 phase, TP, 50 Hz MCC panel , WTP clear water pump room






5

Complete Soft Starter for operation of OLVT pump at Temperature 50 deg Celsius , Rating 90KW,300A, Tested and manufactured as per IEC 60947

3no


7 Dig MFM 1set

3. A. 415 V, 3 phase, TP, 50 Hz MCC panel , WTP motor room

B. 415 V, 3 phase, TP, 50 Hz MCC panel , WTP blower room

4. 415 V, 3 phase, TP, 50 Hz MCC panel , WTP Vacuum Dry bed room


Sec07.4


S.No. Description Qty. 1 ACB,FP,800A,MDO, MICROPROCESSOR BASED 1no

2 MCCB,FP,300A, Thermal Magnetic , Ics=100% Icu , Breaking Capacity =50KA 3no



5 Changeover switch,800A,4P for generator and normal supply 1no

6

Complete Soft Starter for operation of OLVT Pump at Temperature 50 deg Celsius Rating 110KW,300A,Tested and manufactured as per IEC 60947

3no


8 Dig MFM 1set

9

100 KVAR (30+30+20+20 ) inbuilt APFC with APP heavy duty capacitor rated for 480Volts , 7% detuned copper wound reactor for each capacitor and six step APFC relay , capacitor duty reactors and MCCB for each step

1set

5. 415 V, 3 phase, TP, 50 Hz PMCC panel , Intake well

The above BOM is tentative MINIMUM REQUIREMENT. Vendor have to specify BOM with the quotation and may include other material required for successful completion of the whole job.

Name of component Make Model /Rating 1. ACB with Microprocessor based release – Recommended Make -Schneider Electric/

L&T/Legrand /Siemens/ABB or its equivalent 2. MPCB with Microprocessor based release – Recommended Make -Schneider Electric/

L&T/Legrand /Siemens/ABB or its equivalent 3. MCCB with Microprocessor based release – Recommended Make -Schneider Electric/

L&T/Legrand /Siemens/ABB or its equivalent 4. Digital multifunction meter -- Recommended Make --Swift-Encore / Siemens /HPL-

Socomec/Schneider or its equivalent or its equivalent 5. Soft starter -- Recommended Make --ABB/Siemens/Schneider/ L&T/ or its equivalent 6. Starting and Bypass contactors -- Schneider Electric/Siemens/ABB/ L&T/ or its

equivalent 7. Fast acting semi-conductor fuse ABB/Siemens/Schneider L&T/ or its equivalent 8. Ammeter (digital) AE/Rishabh/L & T/Schneider L&T/ or its equivalent 9. Control supply transformer AE/Kappa/Siemens or its equivalent 10. CT, where required AE/Kappa/Siemens L&T/ or its equivalent (Wire wound, 1000/5, 15

VA, Class 1 to IS: 2705) 11. LED indication lamps for on/off/trip status L&T/BCH/ Teknik/Siemens/ Schneider/

ABB/Binay L&T/ or its equivalent 12. Control MCBs Schneider/Legrand/ABB/ Siemens/Indo-Asian (‘C’ Curve) /L&T/ or its

equivalent 13. Fuse/fuse holder GE/ Schneider/Bussman L&T/ or its equivalent

2.1 Power Panel Indoor type, floor mounted, free standing 690 Volts rated Power Control and Motor control center panel made of required vertical sections. The panel should be dust & vermin proof and the degree of protection should be IP- 54. Main Distribution panel should be extendable on both sides by addition of side section after removal of end covers. Said power panel should be fabricated with a framed structure with sheet steel channel section of 3 mm thick, doors and covers should be of 14 S.W.G thick sheet steel. Sheet steel shroud and partitions of power panel should be smoothly finished,


Sec07.5


leveled and free from flaws and the corners to be rounded off. Front & rear doors to be fitted with polyurethane gaskets to ensure higher degree of ingress protection, with suitable fasteners designed to ensure proper compression of the gaskets. For end plates, generous overlap should be maintained between sheet steel surfaces with closely spaced fasteners to prevent entry of dust. All insulating materials used in the construction of the equipment should be of non-hygroscopic, duly treated to withstand high humid condition, high temperature, and tropical conditions , Insulating material used should be SMC , Epoxy or DMC only. Functional units such as A.C.Bs Molded case circuit breakers shall be arranged in multi-tier formation wherever possible. The design of the Power panel should be such that each A.C.B, & MCCB should be fully compartmentalized.

Insulated barriers should be provided with a vertical section and between adjacent section to ensure prevention of accidental contact with main bus bars and vertical risers/droppers during operation, inspection or maintenance of functional units. Bus bar should not be live from front side. All doors/covers providing access to live power Equipments /circuits shall be provided with insulated barriers/separators to prevent unauthorized access. The panel shall be so constructed that there should be sufficient space to accommodate all outgoing & incoming cables. For each incoming and outgoing cables, there should be a cable gland plate of 3 mm thick detachable type at the bottom of the panel as required for bottom entry.

2.2 METAL TREATMENT AND FINISH

A. All metal work used in the construction of L.T power distribution panel should have under gone a rigorous metal treatment process as under: Effective cleaning by hot alkaline degreasing solution followed by cold water rinsing to remove traces of alkaline solution.

B. Pickling in dilute Sulphuric acid to remove oxide scales & rust formation, if any, followed by cold water rinsing to remove traces of acidic solution.

C. A recognized phosphate process to facilitate durable coating of the paint on the metal surfaces and also to prevent the spread of rusting in the event of the paint film being mechanically damaged. This again, shall be followed by hot water rinsing to remove traces of phosphate solution.

D. Passivized in de-oxalate solution to retain & augment the effects of phosphate. E. Drying with compressed air in a dust free atmosphere. F. Primer coating with two coats of a highly corrosion resistant primer, applied wet on wet

and stove dried under strictly controlled conditions of temperature and time. G. Powder coated paint finish of 60 micron thick.

2.3 BUSBARS A. The bus bars should be made of high conductivity, electrolytic Copper. The bus bars

shall be insulated throughout their length by epoxy coating except at the joints. B. The insulation material used shall be of Class H (180 deg. C). C. The insulation should be 100% water resistant. D. The insulation must comply with UL 94 V-O and it should be Halogen Free. E. The ends of the Bus bar shall be electro tinned to avoid corrosion and to ensure proper

conductivity


Sec07.6


F. The bus bars should be suitably braced with non-hygroscopic SMC supports to provide

through fault withstands capacity of 50 KA, RMS symmetrical for one second.

Insulation class of said supports should be class H

G. The neutral bar should also be capable of withstanding the above level. Ridges shall be

provided on the SMC supports to prevent tracking between adjacent bus bars. Large

clearances and creep age distances shall be provided on the bus bar system to

minimize the possibility of fault. All the bus bars shall be made up of copper and

shall have continuous current conductivity of 1.6A/ sqmm , throughout the length of

the panel. The neutral bus bar should be half (50%) of the cross-section of that of the

phase bus bars. Connections from the main bus bars to functional circuits should be so

arranged and supported to withstand any damage or deformation caused by thermal

and dynamic stresses due to short circuit currents. Rating/sizes of the sub bus should be

as shown below.

H. The said L.T power distribution panel should be so designed that the cables are not

directly terminated on the terminals of the breakers/MCCBs etc. but are terminated

on cable termination links. Size of Copper termination links should be same as vertical

droppers.

I. Following minimum clearances to be maintained after taking into account connecting

bolts, clamps etc.

i) Between Phases - 32 mm

ii) Between Phases & neutral - 26 mm iii. Between Phases & Earth - 26 mm

iv. Between neutral & Earth - 26 mm

2.4 AIR BREAK CIRCUIT BREAKERS (CONFIRMING TO IEC 60947-1 & 2.)

• The circuit breakers shall be of the air break type, robust and compact design suitable for indoor mounting and shall comply with the requirement of IS: 13947 : 1993.Rupturing capacity shall be as stipulated in Schedule of quantities. Heat loss per pole shall below.

General:

1. ACB shall comply with standards IS/IEC 60947-1 & 2.

2. ACB shall have a rated operational voltage of 415V AC, rated insulation voltage of 1000 volts AC,

rated impulse voltage of 12kV.

3. ACB shall be of 3pole or 4pole (as per BOQ), air break, molded case design for longer life along

with less maintenance requirement

4. All ACBs shall preferably be of MDO type , if EDO is offered same will also be considered without

any extra cost

5. ACB shall have a Ready to close mechanism preferably having a ready to close mechanical

indication on front of ACB. All ACBs ready to close indication contact which shall be used to give a

single indication via indicating lamps on panel door if ACB is ready to be closed, after

checking all the given conditions (UV release energized, Shunt release de-energized, spring

charged, Breaker is not "ON", Breaker has not tripped on fault, Breaker is not mechanically


Sec07.7


interlocked with other breaker and ACB is not racked in completely in service position) ensuring

safety for user and electrical distribution.

7. ACB shall have the breaking performance Ics = Icu = Icw (1sec) = 50kA

8. ACB shall have minimum Mechanical life of 20000 operations

9. The operating mechanism of ACB shall be of the Open/Closed/Open stored-energy spring type.

The closing time shall be less than or equal to 70ms, and of fast opening type with break time of

breaker should be <30ms to ensure higher life of distribution cables.

Accessories & Auxiliaries:

10. Shunt trip and closing coil (having common AC/DC supply upto 250V) shall be continuous rated.

For Incomer ACBs delayed type under voltage release shall be used to avoid nuisance tripping

during voltage surges.

11. ACBs shall have minimum 4 change-over auxiliary contacts, available to be used for indication

and interlocking, rated at minimum 10A 240/380V 50 Hz and shall be wired on chassis/cradle.

There should be facility to add one more set of 4 contacts if required

12. Pre wired Fault trip contact should be provided with Release as standard.

Indication lamps to be provided on front door of ACB feeder shall be as shown below: -

Spring charge indication required for EDO ACB only.

Safety:

13. Draw-out ACBs shall preferably be provided with a mechanical latch on chassis which latches the

ACB at Connected-Test-Disconnected positions while racking in and racking out the circuit

breaker. This feature will help the operator in placing the circuit breaker at right position inside

the chassis and can help in avoiding the accident.

14. The racking handle of the breaker shall be stored on the air circuit breaker in such a manner as

to be accessible without defeating the door interlocking.

Terminations:

15. All air circuit breakers shall be fully tropicalized as standard & suitable for terminating copper or

aluminium bus bars. Both fixed & draw-out circuit breakers shall have single pole-pitch. ACBs

shall have both side vertical terminal adaptors for better heat dissipation.

Protections:

16. Air circuit breaker shall be provided with microprocessor release, which should be self-powered

type without the need of any auxiliary power supply during normal operation of the breaker.

17. The circuit breaker control unit shall measure the true r.m.s value of the current

18. Circuit breaker trip unit shall have a display for measurement of current and voltage. It shall be

possible to view last 5 trip cause on trip unit.

19. All trip units provided shall have thermal memory as standard

20. All trip units shall be EMC/EMI tested 21. It shall be possible to change the protection settings on line and the circuit breaker need not be

switched off while adjusting the settings.

22. All 4 Pole ACBs shall have neutral rating equal to 100% rating of the main poles of breaker &

shall be protected against over-load faults with provisions for settings neutral unprotected.

Although busbar rating of neutral shall be 50% of main busbar in the panel.


Sec07.8


2.5 Direct online Starters

These starters shall have heavy-duty air break contactors of suitable rating. These shall be total coordination type based on combination of MPCB and contactor with OLR Thermal bimetallic type .These starters shall be complete with adjustable overload relays on all three phases, single phase preventing device and under voltage release. The starters should be “hand reset” type. The “No Volt Coil” of these starters shall be 110 Volts + 10% - 15%. There shall be ON-OFF push button for each starter unless remote operation of the starter is required. The MPCB / contactor / relay selection shall be as per type 2 co-ordination

2.5.1 MOTOR PROTECTION CIRCUIT BREAKERS • All MPCB to be used shall confirm to IS 13947 / IEC 60947 • MPCB shall be Rotary type with Icu = 50KA • The MPCB shall have the mechanism that the contactor trips in the event of overload and MPCB trips in the event of short circuit fault.

2.5.2 Contactor

Contactors shall comply with IEC 60947 .They shall be maintenance free and where possible allow replacement of the coil, without disturbance to the wiring. Contactors shall be suitable for AC3 utilization category. Adequate number auxiliary NO & NC contacts shall be provided on the contactor, as required for the control scheme with at least 2 NO + 2 NC spare contact for operation in coordination of MPCB. All contactors shall be suitable matched for AC3 utilization category and suitable for 3HP /5HP motor starting in DOL mode with MCCB and for the Soft starter offline and online mode shall be 12A rating

2.6 MOULDED CASE CIRCUIT BREAKERS (Confirming to IS 13947 –part 2) All the MCCB shall be , 50 kA or above breaking capacity rated three /four pole fixed type moulded case circuit breaker, with adjustable settings long delay (0.4-1.0 In)/short delay (1.5- 10 long delay setting)/ground fault (0.1-1.0 In) with individual time settings] with separate earth leakage module. The MCCBs shall conform to IEC60947-2/IS 13947-2, tropicalized to Class-II (high humidity). All incoming and outgoing terminals of MCCB shall be fitted with spreader links supplied by MCCB manufacturer or brought out phase links of copper in rectangular sections with hole.

General:

1) MCCbs shall comply with standards IS/IEC 60947-1 & 2. The breaking capacity performance

certificates shall be available for category A to the above mentioned standards.

2) MCCB shall have a rated operational voltage (Ue) of 415V, insulation voltage (Ui) of 690 V (AC

50/60 Hz) & impulse voltage (Uimp) of not less than 8kV.

3) MCCB shall not have any line load bias

4) MCCB shall comply with the environmental directives like RoHS and WEEE

5) 400A and above rating MCCBs - shall be microprocessor based, category B type fixed type

having Icw (1sec) not less than 50kA.

6) MCCBs below 400A shall be Thermal Magnetic Release type


Sec07.9


Performance:

7) The MCCBs shall have a rated service breaking capacity (Ics) equal to the ultimate breaking

capacity (Icu) at 415V and as per system fault levels .

8) The limiting capacity of a circuit breaker is expressed by two curves which are a function of the

prospective short-circuit current (the current which would flow if no protection devices were

installed): The thermal stress (A2s), i.e. the energy dissipated by MCCB during fault should be

as low as possible. Cable selection to be done as per Maximum permissible cable stresses for

which manufacture should produce current limiting and energy limiting curves of MCCB's.

Safety:

9) For maximum safety, the power contacts shall be insulated in an enclosure made of a

thermosetting material from other functions such as the operating mechanism, the case, the

trip unit and auxiliaries (ON/OFF/Trip Contact, Shunt, Under Voltage etc.). All poles shall

operate simultaneously for circuit breaker opening, closing and tripping. MCCBs shall be

actuated by a toggle or rotary-handle that clearly indicates the three distinctive positions: ON,

OFF and TRIPPED. MCCB shall clearly indicate the suitability for isolation in the name plate .

10) MCCBs shall be designed to prevent access to live parts when the cover is removed , means

main current path of the circuit breaker should be isolated from auxiliary section i.e. MCCB

shall offer class –II front face as per IEC standards 61140 and 60664-1

11) The electrical life of MCCBs shall be 8,000 operations up to 250A & 4000 operations up to

630A

12) All MCCBs provided shall be of single frame size upto 250A to reduce the requirement of

spares management.

13) All MCCBs shall have cross bolted type termination where bus bars or cable lugs can be

terminated by crossing the bolt between the lugs/bus bars and MCCB connections, to enhance

safety and reliability of the terminations. In case spreaders/rear connectors are used in

between MCCB and bus bar/lugs then the spreaders shall be cross bolted with the MCCB

connectors.

Auxiliaries and accessories:

14) Following separate Field installable auxiliary contacts for signalizing different functions shall be

provided with all MCCBs

a. open/closed position contact b.

trip signaling contact

c. Electrical fault trip signaling contact

15) Rotary handle shall ensure IP40 for direct type and IP 55 for extended Rotary handle.


Sec07.10


2.6 Measuring Instruments

Size: 96 X 96 mm Deflection: 90°

Accuracy Class: 1 , Ammeters

are not required in outgoings

only on/off indication is

required in all outgoings

2.7 Selector switches ( Required for MFM ): For ALL INCOMING MFM selector switch is required 2.8 Indicating Lamps:

Cut out size: 22.5 mm

Type: L.E.D No. of LEDs per indicator: Cluster of 7 Colour: Red, Yellow, Blue, Green. Allocation of indicating lamps 1) Each Incomers (ACBs):

a) Red, Yellow, Blue Phase indication a) Red --- Breaker on b) Yellow --- Breaker Trip c) Green --- Breaker Off

2) Each Outgoing breakers( ACBs) a) Red ------ Breaker on

b) Yellow ---- Breaker Trip c) Green ----- Breaker Off. For all outgoings only ON/OFF indication is required , Ammeters are not required as shown in GA drawing .

2.9 Sole plate/Plinth:

To mount the panel, M.S channel frame should be fixed below the L.T Panel. Frame should be made of 100 height X 5 mm thick M.S channels.

2.10 Cable glands:

Heavy-duty double compression type, nickel-plated, Brass cable glands of suitable sizes, for the cables mentioned for interconnection of cables shall be in scope of contractor.

2.11 Tubular terminal end (Lugs):

Copper tubular terminal ends for solder less crimping to copper conductors, of

different sizes suitable for above said cables for end termination of cables at both ends including neutral for the cables mentioned for interconnection of cables shall be in scope of contractor.


Sec07.11


2.12 EARTH PITS AND EARTHING OF PANELS

Copper plate type (Plate Size. 600 x 600 x 3.15 mm) earth pits 14 numbers should be

made as per relevant I.S Specifications amended up to date and all electrical

equipments such as L.T Power distribution panel, power panels of individual plants etc.

should be earthed with copper strip of size 25 X 3mm without any joint (Copper strip

should be in one length). The ends of the copper strip should be tinned to avoid

improper contact. To connect earth plate with copper earth strip suitable copper rivets

should be used (Copper).

Earth strip in the panel (L.T Power panel) should be of 6 X 50mm thick copper strip.

Each and every compartment/chamber/doors of the power panel should be earthed

through a flexible, tinned copper braided strip of appropriate size.

All doors shall be duly connected to the main panel by a flexible tinned copper braided

link of 4 sq. mm

No. of Earth pits: 15 (3 for each item as per section VII) SPM representative will inform allocation of the earth pits.

.2.13 SOFT Starter

The soft starter will convert fixed voltage, fixed frequency to Variable voltage, fixed frequency

. The soft starter shall consist of six thyristors , 2 in each phase connected back to back. The

soft starter will vary firing angle of the thyristors to vary the voltage to the motor steadily .It

should incorporate current sensing to limit current to set limits

All the Soft starter shall be provided with following switchgears

Line Contactor – To protect the Soft Starter while not in operation against Voltage

Transients of suitable rating corresponding to soft starter ratings indicated in BOM

Bypass contactor ( Not applicable for soft starters having inbuilt bypass contactors)—

To protect Soft Starter SCR while in operation against Current and Voltage Transients.

Semiconductor fuses :- To protect Soft Starter against excess current transients during

starting and stopping of Motor.


Sec07.12


Soft starter must have Start and stop with Adaptive acceleration Control (AAC) having Current

limit start ,Current ramp start, Kick- Start, Jog and following stop modes with Adaptive

Deceleration Control (AAC) TVR soft stop (Tim ed voltage ram p) ,Coast to stop ,DC brake function-

three phase

The soft starter must have the following controls

1. Voltage Control,

2. Voltage control with current limit,

3. Torque Control.

It should incorporate all protections as specified to protect motor and pump.

A) Conformity to standards.

The soft starter should be developed and performance tested in Accordance with latest

applicable standards, in particular with the soft starter product standard EN/IEC 60947-4-2.

The Soft starter shall be tested to comply with CE , UL and CSA . Test certificate in this respect

shall be enclosed along with bid.

Degree of Protection of control panel: IP 55

Electrical Characteristics

A)3-phase supply voltage: 380V- 15% , 415V + 10%.

B)Frequency variation: 50Hz +/- 5% .

C)Starter current ratings: should be specified at 40/50 °C.

De-rating should be given up to 60°C.

Method of Control:

Torque Control

It should be possible to control Torque and provide Uniform Acceleration irrespective of load

on motor.

Protection Features

A)Pump protection

The soft starter must have features and settings that enable it to protect pump it is driving .

1)Torque limit

2)Initial starting Torque

3)Acceleration torque ramp

4)Under load protection.

5)Overload protection in steady state

6)Monitoring direction of rotation

B) Motor Protection

The soft starter must have following features to protect motor it is driving.

1) Motor overloads protections

2) Detection of phase break.

3) Locked rotor protection.


Sec07.13


Monitoring and Adjustment Parameters

A)Monitoring Parameters

The soft starter shall provide minimum monitoring functions.

1) Starter status

2) Phase rotation direction

3) Motor current

4) Motor thermal state

5) Motor Torque

6) Power drawn in KW/KWH

B)Adjustment parameters

The soft starter shall have minimum adjustment settings other

than those involved In achieving motor and machine protection as follows.

1)Nominal motor current

2)Current limit ( 100% - 700%) of motor limit current

3)Acceleration ,Deceleration Ramps (with adjustment of braking torque level)

4)Selection of type of stop : Freewheel to stop, Ramp to stop

Operator Interface and Interfacing Terminals.

The soft starter shall provide minimum Inputs /Outputs for Inter facing.

1)Logic Inputs: In addition to 2 inputs for run /stop command, the softstarter shall have

additional inputs to provide following functionalities .

a)External Fault

b)Motor pre heating input

c)Fault Reset

d)Force local mode

e) Internal bypass relay fail

2.14 CONTROL WIRING( for remote and local):

For all MCC and PMCC provision for remote and local control should be provided in control wiring. However remote operating panel and its connection is not required to be done For control wiring of proposed L.T Power panel, the fallowing specified wires should be

used. P.V.C insulated, P.V.C sheathed, plain annealed, high conductivity electrolytic

stranded, flexible wires as per IS 8130/1984 amended up to date. VOLTAGE GRADE: 1100

VOLTS AS PER IS 5831/1984 AMENDED UP TO DATE.SIZE: 1.5 SQ.MM (MINIMUM).

Offered cables should be confirming to IS 694/1977 amended up to date and should

carry ISI certification mark. No joints are allowed in between.: “Dowells” or its equivalent

end sealing ferrules.Electro tinned copper end sealing ferrules should be used for end

connections. Pin type/ring tongue fork type/ Snap on type lugs can also be used wherever

necessary.


Sec07.14

2.15 Laying of L.T Power Cables:

L.T power cables should be laid underground. Said cables should be laid at a depth of 1000 mm. Excavation work to lay the cables is in the scope of the bidder. Before laying the cables a sand bed of six inches height should be made and lay the cables on the sand bed. Cables should be covered with a sand layer of six inches thick and then covered with bricks throughout its length. In case two or more cables are laid in one common trench, adjacent gap of 200mm between two cables should be maintained. After laying the cables cable trench/trenches should be covered with excavated clay. Proper cable root markers should also be provided at an interval of fifteen meters.

3 ERECTION

To fix the L.T. Power panel on the cable trench of the power room/sub-station, M.S channels of size 75mm X 6mm shall be grouted as per foundation plan of the L.T Power panel. Base plate/plinth made of 5 mm thick Sheet steel of 100 mm height shall be fixed on the M.S channels. After fixing the plinth L.T. Power panel shall be fixed on the plinth with G.I nut bolts. Plinth and L.T power panel should be so fixed that the cable end boxes/gland plates should be placed on the cable trench for ease of cable entry (Bottom entry). All the incoming and outgoing connections should be made from rear end (Back side)

Out going/incoming cables should be laid in the trenches. Cables should be terminated on both ends with proper cable glands and lugs etc. Cables should be properly dressed; cables should be fixed on G.I “C” racks with wooden cleats in the power room. Inter connection of power cables from L.T Power panel/switch boards to different L.T panels of individual plants is in the scope of the bidder. Earthing of individual power panels as per above said allocation with copper strip of 25 X 3 mm should be done.

Testing and Commissioning

After successful completion of above said work, testing of the equipment should be carried

out including protective relays, measuring instruments, in the presence of our authorised

personnel.

Inspection

1 After manufacturing of the items to be supplied, contractor shall inform the SPM for pre-

dispatch inspection timely . SPM nominated representative(s) will, without any extra cost,

shall inspect and/ or test the ordered work and the related services to confirm their

conformity to the specifications and other quality control. It is expected to provide

necessary support to carry out testing of the items . SPM upon intimation shall inform the

contractor, officials to be deputed for this purpose.

2 Work accepted by SPM and/ or its inspector at initial inspection and in final inspection in

terms of the contract shall in no way dilute SPM's right to reject the same later, if found

deficient in terms of the warranty clause of the contract, as incorporated under GCC

Clause.

3 Travelling expenses, Lodging and boarding charges of SPM officer for pre-shipment

inspection shall be borne by SPM.


tender number:6000008765 - spmcilspmhoshangabad.spmcil.com/uploaddocument/pcc sec... · 2017. 7....

Documents