annexure- 1 (cc no. 77654) technical details of current ... · pdf filethermal current, rated...

Annexure- 1 (CC no. 77654)

Technical Details of Current Transformer: For item No. 1 & 2 The detailed technical specification of the current transformer to be supplied are mentioned below:

S. No. Parameter Details 1. Type Single phase 2. Installation indoor/outdoor Outdoor 3. Rated system voltage kV 220 4. Highest Equipment Voltage kV 245 5. Frequency 50Hz 6. Rated insulation levels

i) Impulse withstand test voltage (kV peak). ii) One minute power frequency withstand test voltage a) Primary winding kV (rms) b) Secondary winding kV (rms)

1050 460 3 kV for metering /4 kV for protection

7. Minimum creepage distance

i) Total (mm) ii) Protected (mm)

5600 2800

8. Rated extended primary current % 120% 9. Rated continuous thermal current 120% 10. Short time current rating

i) Rated short time thermal current ( kA) ii) Rated duration (sec.) iii) Rated dynamic current kA (peak)

40 3 102

11. Maximum temperature rise of winding at rated continuous thermal current, rated frequency and rated burden C

As per IS-2705

12. Reference ambient air temperature deg. C 50 deg. C 13. Class of insulation of winding (Minimum requirement) Class-A 14. Current transformers suitable for

i) Wind velocity Km/ph

ii) Seismic condition (Minimum requirement)

130km/Hr.

0.25g

15. Radio interference voltage microvolts Less than 1000 µV at 156 kV 16.

Minimum visible Discharge voltage level

175kV

17. Terminal box i) Degree of protection ii) Cable glands to be supplied iii) If Yes, size of cable glands for secondary winding termination. iv) Whether short circuiting links supplied Yes/No

IP-55 Yes 25mm ±1mm Yes

18.

Earthing connections Suitable for 2 nos. of 50 X 6 mm GS flat.

19. Current transformer secondary details.

S. No. Parameter Details 19.1 Number of cores 5

19.2 Rated primary current (A) for

i) Core-1 ii) Core-2 iii) Core-3 iv) Core-4 v) Core-5

800-600-400 800-600-400 800-600-400 800-600-400 800-600-400

19.3 Rated secondary current for i) Core –1 ii) Core -2 iii) Core-3 iv) Core -4 v) Core-5

1 Amp. For each core

19.4 It should be possible to adjust tap setting of any core independent of other core

Yes

19.5 Actual transformation ratio 800-600-400/1 19.6 Rated transformation ratio 800-600-400/1 19.7 Application

i) Core-1 ii) Core -2 iii) Core-3 iv) Core -4 v) Core-5

Distance/diff. Distance/ diff. Metering Bus diff. Bus diff.

19.8 Accuracy class i) Core-1 ii) Core -2 iii) Core-3 iv) Core -4 v) Core-5

PS PS 0.2S PS PS

19.9 Rated VA i) Core-1 ii) Core -2 iii) Core-3 iv) Core -4 v) Core-5

-- -- 30 -- --

19.10 Accuracy limit factor i) Core-1 ii) Core -2 iii) Core-3 iv) Core -4 v) Core-5

--- --- --- --- ---

19.11 Minimum knee point voltage i) Core-1, (V) ii) Core -2 , (V) iii) Core-3 , (V) iv) Core -4 , (V) v) Core-5, (V)

1350-1000-675 1350-1000-675 --- 1350-1000-675 1350-1000-675

19.12 Maximum excitation current at VK/4 i) Core-1 mA ii) Core-2 mA iii) Core-3 mA iv) Core-4 mA v) Core-5 mA

<30 <30 --- <30 <30

Other specifications:

i) All routine test will be carried out as per IS 2705 part-1 (Latest version and amendments). In addition to this supplier will carry out a) Measurement of dialectic dissipation factor and b) Oil test as per IS: 335 (latest version).

ii) Type test: Following shall constitute the type test: a) Short time current test b) Temperature rise test. c) Lighting impulse test. d) High voltage power frequency wet withstand voltage test on outdoor current transformer. e) Determination of errors or other characteristics according to the requirements of the appropriate

designation or accuracy class. f) Chopped lightning impulse test on primary winding.

The manufacturer should carry out type test or submit valid test report of type test for current transformer being offered for supply. The type test reports should be submitted or test should be carried out at NABL accredited/ OEM test laboratory.

iii) Tentative QA plan is attached in Annexure-5. However bidder will submit detailed QA plan for approval after PO placement and before manufacturing.

iv) Bidder will submit all dimensional drawings along with the offer. v) Bidder may provide details of oil sampling point to be provided in CT (if it can be provided without

hampering performance of CT as an optional feature). Note:

1) The offered equipment have to be designed, manufactured and tested as per relevant IS/IEC with latest

amendments. 2) Three nos. copies of operation, maintenance and erection manuals in Hindi / English language shall be supplied

one month prior to the dispatch of the Instrument Transformer. 3) The Bidder shall fill the response in the bidder`s response column in Annexure-2 and to be uploaded after his

authorized seal and signature. 4) The bidder shall upload the offered CT General Arrangement drawing as Annexure-3. 5) The bidder shall upload the rating Plate and Sectional view of the 220kV CT as Annexure-4.

S. No. Parameter Details 19.13 Maximum secondary resistance at

75 deg. C. i) Core-1 ohm ii) Core-2 ohm iii) Core-3 ohm iv) Core-4 ohm v) Core-5 ohm

4-3-2 4-3-2 --- 4-3-2 4-3-2

19.14 Instrument securing factor i) Core-1 ii) Core -2 iii) Core-3 iv) Core -4 v) Core-5

--- --- <5 --- ---

20.0 The manufacturing, Marking, Rating, and Testing etc. shall be in accordance with Indian Standards.

IS-2705(Latest)

21.0 The height of CT from center of the primary terminal. 3150 ± 120 (mm) 22.0 Size & material of primary terminals Φ30x90mm long copper rod

(tinned soldered)

Annexure- 2 (CC no. 77654) Technical Details of Current Transformer:

(Bidder shall mention specifications of quoted product in the table mentioned below):

Table-1

S. No. Current Transformers Bidders specification for quoted item 1. Type 2. Installation indoor/outdoor 3. Rated system voltage kV 4. Highest Equipment Voltage kV 5. Frequency 6. Rated insulation levels

i) Impulse withstand test voltage ( kV peak). ii) One minute power frequency withstand test

voltage a) Primary winding kV (rms) b) Secondary winding kV (rms)

7. Minimum creepage distance i) Total (mm) ii) Protected (mm)

8. Rated extended primary current % 9. Rated continuous thermal current 10. Short time current rating

i) Rated short time thermal current (kA) ii) Rated duration sec. iii) Rated dynamic current kA (peak)

11. Maximum temperature rise of winding at rated continuous thermal current, rated frequency and rated burden C

12. Reference ambient air temperature deg. C 13. Class of insulation of winding (Minimum

requirement)

14. Current transformers suitable for

i) Wind velocity Km/ph

ii) Seismic condition (Minimum requirement)

15. Radio interference voltage microvolts 16.

Minimum visible Discharge voltage level

17. Terminal box i) Degree of protection ii) Cable glands to be supplied iii) If Yes, size of cable glands for secondary

winding termination. iv) Whether short circuiting links supplied Yes/No

18. Earthing connections 19. Current transformer secondary details. 19. 1 Number of cores

19. 2 Rated primary current (A) for i) Core-1 ii) Core -2 iii) Core-3 iv) Core -4 v) Core-5

S. No. Current Transformers Bidders specification for quoted item 19.3 Rated secondary current (A) for

i) Core –1 ii) Core -2 iii) Core-3 iv) Core -4 v) Core-5

19.4 It should be possible to adjust tap setting of any core independent of other core

19.5 Actual transformation ratio

19.6 Rated transformation ratio

19.7 Application i) Core-1 ii) Core -2 iii) Core-3 iv) Core -4 v) Core-5

19.8 Accuracy class i) Core-1 ii) Core -2 iii) Core-3 iv) Core -4 v) Core-5

19.9 Rated VA i) Core-1 ii) Core -2 iii) Core-3 iv) Core -4 v) Core-5

19.10 Accuracy limit factor i) Core-1 ii) Core -2 iii) Core-3 iv) Core -4 v) Core-5

19.11 Minimum knee point voltage i) Core-1, (V) ii) Core -2 , (V) iii) Core-3 , (V) iv) Core -4 , (V) v) Core-5, (V)

19.12 Maximum excitation current at VK/4 i) Core-1 mA ii) Core-2 mA iii) Core-3 mA iv) Core-4 mA v) Core-5 mA

19.13 Maximum secondary resistance at 75 deg. C. i) Core-1 (ohm) ii) Core-2 (ohm) iii) Core-3 (ohm) iv) Core-4 (ohm) v) Core-5 (ohm)

Bidder should mention details of Compliance of the points mentioned item sr. no. i) to vi) in the Table-2 mentioned below:

Table-2

S. No. Current Transformers Bidders specification for quoted item

19.14 Instrument securing factor i) Core-1

ii) Core -2 iii) Core-3 iv) Core -4 v) Core-5

20.0 The manufacturing, Marking, Rating, and Testing etc. shall be in accordance with Indian Standards.

21.0 The height of CT from foundation to center of the primary terminal. (If height is other than to 3150 mm, bidder shall provide the necessary arrangement. The arrangement shall be mentioned in the bidders compliance column)

22.0 Size & material of primary terminals. (The terminal clamps, mentioned in indented item sr. no.2, shall be provided as per CT primary terminal size (provided by bidder) and other ends as per 3” IPS tube and moose conductor, which are shown in the connectors drawing, Annexure-6 a & b)

S. No. Description of other specification Bidders compliance for specification i) All routine test will be carried out as per IS 2705 part-1

(Latest version and amendments). In addition to this supplier will carry out measurement of dialectic dissipation factor and oil test as per IS: 335 (latest version).

ii) Type test: Following shall constitute following type test: a) Short time current test b) Temperature rise test. c) Lighting impulse test. d) High voltage power frequency wet withstand

voltage test on outdoor current transformer. e) Determination of errors or other characteristics

according to the requirements of the appropriate designation or accuracy class.

f) Chopped lightning impulse test on primary winding.

The manufacturer should carry out type test or submit valid test report of type test for current transformer being offered for supply. The type test reports should be witness or test should be carried out at NABL accredited/ OEM test laboratory.

iii) Tentative QA plan is attached in Annexure-5. However bidder will submit detailed QA plan for approval after PO placement and before manufacturing

iv) Bidder shall submit all dimensional drawings including General arrangement, rating plate and Sectional view of 220kV CT, along with the offer.

v) Bidder may provide details of oil sampling point to be provided in CT (if it can be provided without hampering performance of CT as an optional feature).

vi) Three nos. copies of operation, maintenance and erection manuals in Hindi / English language shall be supplied one month prior to the dispatch of the Instrument Transformer.

Annexure-3 (CC no. 77654)

General Arrangement of 220kV CT


Sectional View of 220kV CT


Tentative QA Plan S.N. Component

& operation Characteristics Classification Type of check Quantum

of check Reference document

Acceptance norm

Format of record

Agency Remark

1 2 3 4 5 6 7 8 9 10 11 QP NO:1 MATERIALS 1 Copper

conductor Dimension Major Measurement One

sample IS:1897 & IS:7391

Within limits specified in reference documents

Recording register

OEM Review of test reports/ certificates by NPC Q.S.

Tensile strength Major Test One sample

IS:1897 & IS:7391

Recording register

OEM

Elongation Major Test One sample

IS:1897 & IS:7391

Recording register

OEM

Conductivity Major Test One sample

IS:3635 Recording register

OEM

Chemical composition

Major Test One sample

IS:191 Recording register

OEM

Conductor finish

Major Visual 100% IS:1897 & IS:7391

No scratches dents and tarnishing

Recording register

OEM

2. Insulating paper

Dimension Minor Measurement One sample

OEM Std. OEM Std. Recording register

OEM Review of test reports/ certificates by NPC Q.S.

Physical properties (Tensile strength oil absorption)



OEM

Electric strength



OEM

Bursting strength elongation



OEM

Reaction with hot oil


OEM Std. No change in acidity of oil

Recording register

OEM

Physical Condition

Major Visual One sample

OEM Std. No damage, free from foreign

Register OEM

S.N. Component & operation

Characteristics Classification Type of check Quantum of check

Reference document

Acceptance norm

Format of record

Agency Remark

particles Density Major Test One

sample OEM Std. OEM Std. Register OEM

3. Oil All characteristics as per IS: 335

Minor Test One sample

IS:335 IS:335 Register OEM Review of test reports/ certificates by NPC Q.S. Witness of test by M/s OEM & review by NPC QS

Loss angle measurement

Minor Test One sample

IS:335 IS:335 Register OEM

BDV Minor Test One sample


PPM Minor Test One sample


Resistivity Minor Test One sample


Density Minor Test One sample


4. Gaskets (rubberized cork/Silicon Rubber)

Physical properties shore hardness resistance to oil dimension check ageing test compressibility &recovery factor


OEM std. OEM std. Register OEM Review of test reports/ certificates by NPC Q.S.

5. Porcelain insulator

Dimension Major Measurement 100% IS:5621 IS:5621 Register OEM Review of test reports/ certificates by NPC Q.S. Creepage

length Major Measurement One

sample 100% 100% Register OEM

Visual inspection

Major Visual 100% 100% 100% Register OEM

Acceptance and routine tests

Major Test 100% 100% 100% Register OEM

6. Tank sand steel parts

Dimensions Major Measurement 100% Mfg. Drg. Mfg. drawing

Register OEM Review of test reports/ certificates by NPC Q.S.

Pressure test D.P. test on lifting lugs

Major Measurement 100% IS:3658 IS:3658 Register OEM



Reference document

Acceptance norm

Format of record

Agency Remark

7. Name plate Visual check Major Visual 100% OEM std. OEM std. Register OEM Review of test reports/ certificates by NPC Q.S.

8. Terminal connectors

Dimension Major Measurement 100% Approved drawing

Approved drawing

Register OEM Review of test reports/ certificates by NPC Q.S.

Q.P. NO: 2 IN PROCESS INSPECTION 2.1 CRGO Ring

Core Dimension Major Measurement 100% Design drg. Design drg. Register OEM Review of test reports/

certificates by NPC Q.S. Witness of test by M/s OEM & review by NPC QS

Magnetizing-characteristic

Major Measurement 100% Design drg. Design drg. Register OEM

2.2 Primary and secondary winding

Proper laying of conductor

Major

Visual

100%

Design drg.

Design drg.

Register

OEM Review of test reports/ certificates by NPC Q.S. Dimension

check Major measurement 100% Design drg. Design drg. Register

2.3 Tanking Dimension Major Visual 100% Design drg. Design drg. Register OEM Review of test reports/ certificates by NPC Q.S. Witness of test by M/s OEM & review by NPC QS

Clearances Major Measurement 100% Design drg. Design drg. Register OEM

2.4 Drying & impregnation

Period temperature vacuum

Critical Measurement 100% Design specification

Design specification

Register OEM Review of test reports/ certificates by NPC Q.S. Witness of test by M/s OEM & review by NPC QS

Q.P. NO: 3 FINAL INSPECTION 3.1 Conformity

with GOA drawing

Major Measurement/ visual

100% Design specification


Register OEM Hold point, test is to be conducted in presence of NPC QS representatives & clearances to be obtained.

3.2 All fittings verification

- Major Visual 100% Design specification





Reference document

Acceptance norm

Format of record

Agency Remark

3.3 Routine test As per IS:2705 Major Test 100% Design spec. Design spec.


3.4 Type test: a) Lightning

impulse withstand test

As per IS : 2075

Major Test Any one sample

IS:2075 IS: 2075 Register OEM The manufacturer should carry out type test or submit valid test report of type test for current transformer being offered for supply. The type test reports should be witness or test should be carried out at NABL accredited/ OEM test laboratory.

b) Visible discharge test

IS: 2099 Major Test Any one sample

IS: 2099 IS: 2099 Register OEM

c) Temperature rise test

IS: 2075 Major Test Any one sample


d) Partial discharge test

IEC-44-4 Major Test Any one sample

IEC-44-4 IEC-44-4 Register OEM

e) H V power frequency voltage withstand (Wet) test

IS: 2071 part-I & II



f) Mechanical test on porcelain


Register OEM

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