11KV SAT Procedure [PDF]

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SITE ACCEPTANCE TEST

INDEX 1. 11 kV SWITCHGEAR 1.1 METHOD STATEMENTS 1.2 TEST REPORT FOR METAL CLAD SWITCHGEAR 1.3 TEST REPORT FOR 11kV BUSBAR 1.4 TEST REPORT FOR CIRCUIT BREAKER 1.5 TEST REPORT FOR CURRENT TRANSFORMER 1.6 TEST REPORT FOR VOLTAGE TRANSFORMER 1.7 OUTPUT SIGNALS - FUNCTION

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SITE ACCEPTANCE TEST

1.1 METHOD STATEMENTS 1. Metal Clad Switchgear  

Check for Completeness of installation as per check list Prior testing Erection Check Format /Erection Control Form) must be checked

  

and filled Check Insulation Resistance values for all aux circuits Check Operation of Breakers Check Function of control and selector switches

   

Check Function of meters and relays Check over all function of current and voltage transformers Check Function of aux. CT / aux. PT if any Check Function of control circuits and fuses

 

Check Function of heater and heater switch Check Function of cubicle illumination lamp

NOTE: Relevant drawings, this SAT procedure, FAT report and test forms must be available on site during testing. 2. HVAC Test (i) IR Value Measurement  

Measure insulation resistance at 5000 V DC Between phases Between phase to earth

(ii) HVAC Test : This test is to be carried out on each of the phases with respect to earth. AC voltage equal to 2.5 times of line voltage (27.5kV) for 1 minute is applied to the conductor with respect to ground. The leakage current is recorded and noted down.

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SITE ACCEPTANCE TEST

3. Circuit Breaker (i)

IR Value   

(ii)

Across the Pole when breaker is open Between the pole when breaker is closed Pole to earth when breaker is closed

Contact Resistance Test As per IEC publication 694 the measurement of contact resistance shall be made by voltage drop method by passing a direct current of not less than 100 Amps through the circuit breaker (in closed position) and measuring the voltage drop across the breaker terminals (Incoming – outgoing), it is achieved by using micro ohmmeter.

(iii)

Timing Test The measurement may be made at normal control voltage and the values obtained shall be not more than the ones given below (a) Closing times around 100 milli seconds. (b) Tripping time around 40 milli seconds.

(iv)

Operational and functional check (a) Operational Check  Local and Remote Closing and tripping  

Protection Tripping Anti Pumping if any

(b) Functional Check    

Emergency Trip ON - OFF Indication Spring Charge Limit Switch C.B Auxiliary Contacts Page: 3 / 25

SITE ACCEPTANCE TEST

 

Auto Trip Indication Trip Circuit Healthy

4. Current Transformer (I) IR Value Measurement  Measure insulation resistance Primary to earth and between primary to 

secondary by using 5000V megger. Measure insulation resistance between secondary cores and secondary core to earth by using 500V megger.

(ii) Continuity Test Measure the continuity of the winding by using multimeter. (iii) Winding resistance measurement Measure the winding resistance of the CT by using low range micro ohm meter. (iv) Polarity Test This test is to be carried out by applying small DC voltage on one side of the CT and the direction of momentary deflection of a milli ammeter on the opposite side of the CT is noted and compared with polarity marks. (v) Ratio Test This test is to be carried out by applying current in primary and record the Current value in secondary. To get the ratio of the CT by dividing the Primary current by that of the secondary current and comparing with it rated value. (vi) Magnetising Curve Test (Excitation Test) Excitation tests are made to assure the CT is capable of developing its published secondary terminal voltage without excessive excitation current. An excitation curve is plotted by applying various values of an AC voltage below saturation level to the secondary with the primary open circuited. While measuring secondary current and voltage substantial deviations from published curves should be investigated (or from the curves obtained during commissioning) and may indicate a turn to turn short Page: 4 / 25

SITE ACCEPTANCE TEST

circuit or a completed magnetic path around the CT core.

(vii) Burden Measurement This test is to be carried out by applying the rated current to the secondary circuit of the CT and measure the voltage across secondary. The burden is usually expressed in volt – ampere absorbed at a specified power factor and at rated secondary current. 5. Voltage Transformer (i) IR Value Measurement  

Measure insulation resistance Primary to earth and between primary to secondary by using 5000V megger. Measure insulation resistance between secondary cores and secondary core to earth by using 500V megger.

(ii) Winding resistance measurement Measure the winding resistance of the VT by using low range micro ohm meter. (iii) Polarity Test This test is to be carried out by applying small DC voltage on one side of the VT and the direction of momentary deflection of a milli ammeter on the opposite side of the VT is noted and compared with polarity marks. (iv) Ratio Test This test is to be carried out by applying voltage in primary and measure the voltage value in secondary. To get the ratio of the VT by dividing the Primary voltage by that of the secondary voltage and comparing with it rated value. (v) Burden Measurement This test is to be carried out by applying the rated voltage to the secondary circuit of the VT and measure the current drawn by the secondary circuit. The burden is usually expressed in volt – ampere absorbed at a specified power factor and at rated secondary voltage. Page: 5 / 25

SITE ACCEPTANCE TEST

1.2 TEST REPORT FOR METAL CLAD SWITCHGEAR 1. Location : 2. Name Plate Details : Make : Type : 3. Check for Completeness of installation as per check (erection control form) list 4. Insulation Resistance values for all aux circuits 5. Operation of Breakers 6. Function of control and selector switches 7. Function of meters and relays 8. Function of current and voltage transformers 9. Function of aux CT / aux PT if any 10. Function of control circuits and fuses 11. Function of heater and heater switch 12. Function of cubicle illumination lamp

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SITE ACCEPTANCE TEST

1.3 TEST REPORT FOR HVAC TEST

1. Location : 2. Name plate :

3. Insulation Resistance Test : Using 5kV Megger Date : Circuit Ref

Before HV Test

Temp : After HV Test

R – Phase to Earth Y – Phase to Earth B – Phase to Earth R-Phase to Y-Phase Y-Phase to B-Phase B-Phase to R-Phase 4. HVAC Test : Applied Voltage : 27.5 kV AC Duration : 1 min All Circuit Breakers in Service Position Circuit Ref

Leakage Current ( mA )

R phase - Earth Y phase - Earth B phase - Earth Page: 7 / 25

SITE ACCEPTANCE TEST

5. INSTRUMENTS USED FOR TESTING

Description

Serial No

Calibration Validity

6. Remarks :

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SITE ACCEPTANCE TEST

1.4 TEST REPORT FOR CIRCUIT BREAKER in acc to IEC 62271 - 100 1.Location : Designation : 2.Name Plate Details : Make : ABB Type : VD4 Breaking Capacity Making Capacity

Sl.No. Rated Voltage

: :

: 25kA

Rated Current

:

: 63kA

Operating Sequence

:

12kV

O - 0.3S – CO - 3Min - CO

3.General Inspection and Pre commissioning checks as per check list : 4. Insulation Resistance Measurement Megger Used :

Date :

5000 V CIRCUIT REF

PHASE R-Phase

Y-Phase

B-Phase

Across Poles / Contacts ( When C.B Open ) Pole - Earth ( When C.B Closed ) Pole - Pole ( When C.B Closed )

Tested by ABB

R-Y

Witnessed by Contractor

Y-B

B-R

Witnessed by Consultant

Signature Name Date Page: 9 / 25

SITE ACCEPTANCE TEST

5. Contact Resistance ( In Micro Ohms ) : R - PHASE

Y - PHASE

Temp : B - PHASE

6. Timing Test A. At Rated Voltage : in millisecs (ms) Operation

R- Phase

Y- Phase

B - Phase

Close Open Close - Open B. At 85% Voltage : in millisecs (ms) Operation

R- Phase

Y- Phase

B - Phase

Close Open Close - Open 8. Operational Checks : a) FUNCTION

MANUAL

ELECTRICAL LOCAL

REMOTE

CLOSE OPEN b) Protection Trip : Tested by ABB

Witnessed by Contractor

Witnessed by Consultant

Signature Name Date Page: 10 / 25

SITE ACCEPTANCE TEST

9. Functional Checks : Sl. No

Description

a.

Emergency Trip :

b.

ON - OFF Indication (Mechanical) :

C.

ON - OFF Indication (Electrical) :

d.

Spring Charge limit switch :

e.

C.B Auxiliary Contacts :

f.

Auto Trip Indication :

g.

Test/Service limit switch:

h.

Test-Service position indication (Mechanical):

i.

Test-Service position indication (Electrical):

Status

10. Interlock checks: Sl. No 1 2 3 4 5 6

Description

Status

When the Circuit Breaker in Service position, Check the operation of Earth Switch. When the Earth Switch is closed, check the rack-in operation of Circuit Breaker. When the Circuit Breaker in Service position, Check the operation of Busbar Earth Switch. When the Busbar Earth Switch is closed, check the rack-in operation of Circuit breaker. Check the operation of Circuit Breaker in between Test & Service position. When the Circuit Breaker in Service position, open the access door.

Tested by ABB

Witnessed by Contractor

Witnessed by Consultant

Signature Name Date Page: 11 / 25

SITE ACCEPTANCE TEST

Sl. No

Description

Status

7

When the Earth Switch is open, open the VT access door.

8

When the VT access door is open, open the Earth Switch.

9

When the Circuit Breaker in Service position & closed, check the rack-out operation of Breaker.

11. INSTRUMENTS USED FOR TESTING Description

Serial No

Calibration Validity

12. Remarks :

Tested by ABB

Witnessed by Contractor

Witnessed by Consultant

Signature Name Date Page: 12 / 25

SITE ACCEPTANCE TEST

1.5 TEST REPORT FOR CURRENT TRANSFORMER 1.Location

:

Designation

:

2.Name Plate Details : Make Sl.No.

: : R Y B

Ratio Class Burden Kpv

: : : :

Resistance

:

3.General Inspection and Pre commissioning checks as per check list : 4. (i) Insulation Resistance Measurement Megger Used :

Date :

5000 V PHASE

CORE R-Phase

Y-Phase

B-Phase

Primary - Secondary Core I Primary - Secondary Core II Primary - Secondary Core III Primary - Earth 5. Print out from CT Analyzer is attached .

Tested by ABB

Witnessed by Contractor

Witnessed by Consultant

Signature Name Date Page: 13 / 25

SITE ACCEPTANCE TEST

ii) Insulation Resistance Measurement

Date :

Megger Used : 500 V PHASE

BETWEEN CORES R-Phase

Y-Phase

B-Phase

Secondary Core I - Earth Secondary Core II - Earth Secondary Core III - Earth Secondary Core I - Core II Secondary Core I - Core III Secondary Core II - Core III 6.Continuity Test : Continuity Check Between Terminals : CORES

BETWWEN TERMINALS

CORE I

PHASE R-Phase

Y-Phase

B-Phase

1S1 - 1S2 1S1 - 1S3

CORE II

2S1 - 2S2 2S1 - 2S3

CORE III

3S1 - 3S2 3S1 - 3S3

Tested by ABB

Witnessed by Contractor

Witnessed by Consultant

Signature Name Date Page: 14 / 25

SITE ACCEPTANCE TEST

7. Secondary Winding Resistance ( In Ohms ) : CORES

Temp : PHASE

TERMINAL R-Phase

CORE I

1S1 - 1S2 1S1 - 1S3

CORE II

2S1 - 2S2 2S1 - 2S3

CORE III

3S1 - 3S2 3S1 - 3S3

Y-Phase

B-Phase

8. Polarity Test : With 1.5 V D.C Supply Connect +VE AT P1 and -VE AT P2 CORES

CONNECT NULL DEFLECTION METER BETWEEN

CORE I CORE II CORE III

1S1 (+VE),

1S2 (-VE)

1S1 (+VE),

1S3 (-VE)

2S1 (+VE) ,

2S2 (-VE)

2S1 (+VE),

2S3 (-VE)

3S1 (+VE),

3S2 (-VE)

3S1 (+VE),

3S3 (-VE)

Tested by ABB

PHASE R-Phase Y-Phase

Witnessed by Contractor

B-Phase

Witnessed by Consultant

Signature Name Date Page: 15 / 25

SITE ACCEPTANCE TEST

9. RATIO TEST (a) Selected Ratio : PHASE REF

PRI. CURRENT %

ACTUAL

SEC. CURRENT Core-1

Core-2

THEORITICAL ACTUAL RATIO RATIO Core-1 Core-2

(1S1-1S2) (1S1-1S2) R

Y

B

(b) Selected Ratio : PHASE REF

PRIMARY CURRENT %

ACTUAL

SECONDARY CURRENT

THEORITICAL RATIO

Core-1 Core-2 (1S1-1S3) (1S1-1S3)

ACTUAL RATIO Core-1

Core-2

R

Y

B

Tested by ABB

Witnessed by Contractor

Witnessed by Consultant

Signature Name Date Page: 16 / 25

SITE ACCEPTANCE TEST

10. Magnetizing Curve Performance : Ratio : R-Phase

Y - Phase

B - Phase

Core - 1

Core - 1

Core - 1

1S1 – 1S2 V

I (mA)

1S1 – 1S3 V

I (mA)

Tested by ABB

1S1 – 1S2 V

I (mA)

1S1 – 1S3 V

I (mA)

Witnessed by Contractor

1S1 – 1S2 V

I (mA)

1S1 – 1S3 V

I (mA)

Witnessed by Consultant

Signature Name Date Page: 17 / 25

SITE ACCEPTANCE TEST

10. Magnetizing Curve Performance : Ratio : R-Phase

Y - Phase

B - Phase

Core - 2

Core - 2

Core - 2

2S1 – 2S2 V

I (mA)

2S1 – 2S3 V

I (mA)

Tested by ABB

2S1 – 2S2 V

I (mA)

2S1 – 2S3 V

I (mA)

Witnessed by Contractor

2S1 – 2S2 V

I (mA)

2S1 – 2S3 V

I (mA)

Witnessed by Consultant

Signature Name Date Page: 18 / 25

SITE ACCEPTANCE TEST

10. Magnetizing Curve Performance : R-Phase

Y - Phase

B - Phase

Core -1

Core -2

Core -3

Core -1

Core -2

Core -3

Core -1

Core -2

Core -3

1S1-1S2

2S1-2S2

3S1-3S2

1S1-1S2

2S1-2S2

3S1-3S2

1S1-1S2

2S1-2S2

3S1-3S2

V

V

V

V

V

V

V

V

V

I (mA)

I (mA)

I (mA)

Tested by ABB

I (mA)

I (mA)

I (mA)

Witnessed by Contractor

I (mA)

I (mA)

I (mA)

Witnessed by Consultant

Signature Name Date Page: 19 / 25

SITE ACCEPTANCE TEST

11. Burden Measurement : Phase Ref

Core Ref

Applied Current in Amps

Measured Voltage in Volts

Core - 1 R Phase

Core - 2 Core - 3 Core - 1

Y - Phase

Core - 2 Core - 3

B - Phase

Core - 1 Core - 2 Core - 3

11.1 CT Model used

12. INSTRUMENTS USED FOR TESTING Description

Serial No

Calibration Validity

13. Remarks : Tested by ABB

Witnessed by Contractor

Witnessed by Consultant

Signature Name Date Page: 20 / 25

SITE ACCEPTANCE TEST

1.6 TEST REPORT FOR VOLTAGE TRANSFORMER 1.Location

:

Designation : 2.Name Plate Details : Make : Sl.No.

: R Y B

Ratio

:

Burden

:

3.General Inspection and Pre commissioning checks as per check list : 4 i) Insulation Resistance Measurement

Date :

Megger Used : 5000V PHASE

CORE R-Phase

Y-Phase

B-Phase

Primary - Secondary Core I Primary - Secondary Core II Primary - Secondary Core III Primary - Earth

Tested by ABB

Witnessed by Contractor

Witnessed by Consultant

Signature Name Date

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SITE ACCEPTANCE TEST

ii) Insulation Resistance Measurement Megger Used : 500 V

Date :

PHASE

BETWEEN CORES R-Phase

Y-Phase

B-Phase

Secondary Core I - Earth Secondary Core II - Earth Secondary Core I - Core II 5. Secondary Winding Resistance ( In Ohms ) : CORE

Temp : PHASES

TERMINAL R -PHASE

Y - PHASE

B - PHASE

CORE - 1 CORE - 2

6. Primary Winding Resistance ( in Ohms ) : CORE

Temp : PHASES

TERMINAL R -PHASE

Y - PHASE

B - PHASE

CORE - 1 CORE - 2

7. Polarity Test : With V D.C Supply Connect Battery at Secondary Terminals and note the deflection in Primary Terminals. R - PHASE Core-1

Core-2

Tested by ABB

Y - PHASE Core-1

Core-2

Witnessed by Contractor

B - PHASE Core-1

Core-2

Witnessed by Consultant

Signature Name Date Page: 22 / 25

SITE ACCEPTANCE TEST

8. Ratio Test : PHASE

SECONDARY VOLTAGE

PRIMARY VOLTAGE

BETWEEN

THEORITIC AL RATIO

ACTUAL RATIO

VALUE

a-n R - PH

da – dn a-n da – dn a-n

Y - PH

da – dn a-n da – dn a-n

B - PH

da – dn a-n da – dn

9. Burden Measurement : Phase Ref

R Phase Y - Phase B - Phase

Core Ref

Applied Voltage in Volts

Measured Current in mA

Core - 1 Core - 2 Core - 1 Core - 2 Core - 1 Core - 2 Tested by ABB

Witnessed by Contractor

Witnessed by Consultant

Signature Name Date

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SITE ACCEPTANCE TEST

10. No Load Test : Duration : 30 mins Phase Ref

Core Ref

Applied Voltage at Secondary in Volts

Measured Current in Amps

Core - 1

R Phase

Core - 2 Core - 1

Y - Phase

Core - 2 Core - 1

B - Phase

Core - 2

11. VT model used

12. Remarks :

Tested by ABB

Witnessed by Contractor

Witnessed by Consultant

Signature Name Date Page: 24 / 25

SITE ACCEPTANCE TEST

1.8 OUTPUT – SIGNALS – FUNCTION Location: Designation 1.

Designation

Local Indication

Signal Status

CB TRUCK IN TEST POSITION CB TRUCK IN SERVICE POSITION E/S OPEN E/S CLOSED CB MOTOR SPRING CHARGE FAILURE HEATERS ON LOAD SHEDDING TRIP

2. Remarks :

Tested by ABB

Witnessed by Contractor

Witnessed by Consultant

Signature Name Date

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