30-35 Mva-11

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E N E R G Y P A C E N G I N E E R I N G L T D. FORM NO. : Dated :

POWER TRANSFORMER TESTING LABORATORY REF : EELF/TR-30/35 REV : SL. NO: 30/35-4-0023/1700 0001

EELF /11 30-09-11

FACTORY TEST REPORT OF 30/35 MVA , 132/11 KV POWER TRANSFORMER Transformer Rating Sheet Name of the Client

:

RAHIMAFROOZ POWER PLANT

Job Description

:

30/35 MVA,132/11 KV , 3-phase, 50Hz Power Transformer

Vector Group

:

YNd1

Connections

:

Three-Phase

Type of Tap Changer

:

ON-Load Tap Changer

Winding Designation

:

HV

Terminal Notation

:

A

Rated Capacity in MVA ONAN ONAF

: :

30 35

30 35

Rated Voltage (in kV) Rated Current (in Ampere) ONAN ONAF Basic Insulation level (in kV) Line Terminals

:

132

11

: :

131.22 153.08

1574.59 1837.02

:

LI-650, AC-275

LI-75, AC-28

Standard

:

BS-171/IEC-76

LV Voltage

:

11000 Volts in all Tap Positions.

Serial No.

:

30/35-4-0023/1700 0001

** **

ONAN : ONAF :

LV B

C

N

a

b

c

Oil Natural Air Natural. Oil Natural Air Forced.

Test Performed by Sajal Rahman Azad Assistant Engineer, (Testing)

Checked by Asim Kumar Bhakta Manager ,(Testing), EELF

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E N E R G Y P A C E N G I N E E R I N G L T D.

POWER TRANSFORMER TESTING LABORATORY REF : EELF/TR-30/35 REV : SL. NO: 30/35-4-0023/1700 0001

FORM NO. : Dated :

EELF /11 30-09-11

HV Voltages and Currents in different tap position

** **

Tap Position

Voltage

1 2 3 4 5 6 7 8 9 10 11 12 13a 13b 13c 14 15 16 17 18 19 20 21 22 23 24 25

145200 143550 141900 140250 138600 136950 135300 133650 132000 130350 128700 127050 125400 125400 125400 123750 122100 120450 118800 117150 115500 113850 112200 110550 108900 107250 105600

Currents in Ampere 30 MVA 35 MVA 139.17 119.29 140.77 120.66 142.40 122.06 144.08 123.50 145.80 124.97 147.55 126.47 149.35 128.02 151.20 129.60 153.09 131.22 155.02 132.88 157.01 134.58 159.05 136.33 161.14 138.12 161.14 138.12 161.14 138.12 163.29 139.96 165.50 141.86 167.76 143.80 170.09 145.80 172.49 147.85 174.95 149.96 177.49 152.13 180.10 154.37 182.79 156.68 185.56 159.05 188.41 161.50 191.36 164.02

Principal Tap Position : 9 Step Voltage 1.25% of 132000 Volt

Test Performed by Sajal Rahman Azad Assistant Engineer, (Testing)

Checked by Asim Kumar Bhakta Manager ,(Testing), EELF

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POWER TRANSFORMER TESTING LABORATORY REF : EELF/TR-30/35 REV : SL. NO: 30/35-4-0023/1700 0001

FORM NO. : Dated :

EELF /11 30-09-11

Measurement of Insulation Resistance Test Voltage = Mean Transformer Oil Temperature = Time (Seconds) 15

HV – E 625

60

840

1510

2100

DAR = IR60 / IR15

1.34

2.15

1.9

Note :

DAR = =

**

5kV 30ºC Insulation Resistance (Mega Ohms) LV – E HV – LV 700 1100

Di electric absorption Ratio Insulation Resistance after 60 seconds Insulation Resistance after 15 seconds

Insulation Resistance measured by 5kV Electronic BM !4 Mega-ohm Meter, manufactured by Megger Industries Ltd., England, Calibrated by Cali-Labs, Bhopal, India, Calibration due on 28-08-2012.

Test Performed by Sajal Rahman Azad Assistant Engineer, (Testing)

Checked by Asim Kumar Bhakta Manager ,(Testing), EELF

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E N E R G Y P A C E N G I N E E R I N G L T D.

POWER TRANSFORMER TESTING LABORATORY REF : EELF/TR-30/35 REV : SL. NO: 30/35-4-0023/1700 0001

FORM NO. : Dated :

EELF /11 30-09-11

Measurement of Turn Ratio Tap Position 1 2 3 4 5 6 7 8 9 10 11 12 13a 13b 13c 14 15 16 17 18 19 20 21 22 23 24 25

HT Voltage 145200 143550 141900 140250 138600 136950 135300 133650 132000 130350 128700 127050 125400 125400 125400 123750 122100 120450 118800 117150 115500 113850 112200 110550 108900 107250 105600

LT Voltage 11000 11000 11000 11000 11000 11000 11000 11000 11000 11000 11000 11000 11000 11000 11000 11000 11000 11000 11000 11000 11000 11000 11000 11000 11000 11000 11000

Calculative ratio 7.621 7.534 7.447 7.361 7.274 7.188 7.101 7.014 6.928 6.841 6.754 6.668 6.581 6.581 6.581 6.495 6.408 6.321 6.235 6.148 6.062 5.975 5.888 5.802 5.715 5.629 5.542

Measured Ratio Phase A 7.615 7.529 7.442 7.354 7.268 7.180 7.094 7.008 6.921 6.833 6.748 6.661 6.575 6.575 6.575 6.489 6.403 6.316 6.229 6.142 6.061 5.969 5.883 5.797 5.710 5.623 5.537

Phase B 7.611 7.528 7.441 7.356 7.268 7.182 7.096 7.009 6.922 6.837 6.750 6.664 6.579 6.579 6.579 6.492 6.404 6.318 6.231 6.145 6.059 5.972 5.886 5.791 5.712 5.627 5.540

Phase C 7.620 7.529 7.443 7.359 7.271 7.187 7.097 7.013 6.927 6.840 6.752 6.667 6.581 6.581 6.581 6.492 6.408 6.322 6.237 6.148 6.062 5.975 5.889 5.801 5.716 5.630 5.544

REMARKS: The Voltage Ratio between HT & LT Side of the Transformer for every Tap position is OK. Polarity of the Transformer is OK. The vector Group of the Transformer is YNd1. ** Turn Ratio is measured by Eltel Turn Ratio Meter (Model TRM 100.) Manufactured by Eltel Industries, Bangalore, India , Calibrated by Cali-Labs, Bhopal, India, Test Performed by Sajal Rahman Azad Assistant Engineer, (Testing)

Checked by Asim Kumar Bhakta Manager ,(Testing), EELF

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FORM NO. : Dated :

POWER TRANSFORMER TESTING LABORATORY REF : EELF/TR-30/35 REV : SL. NO: 30/35-4-0023/1700 0001

EELF /11 30-09-11

Calibration due on 28-08-2012.

Measurement of Winding Resistance Tap Position : 9 30 C

Temperature :

LT Side

a -b

:

12.08

m ohms

b- c

:

11.92

m ohms

c -a

:

12.27

m ohms

Average

:

12.09

Average Phase resistance

m ohms

:

18.135

m ohms

Average Phase resistance (AT 75  C) :

21.199

m ohms

1.078

ohms

HT Side

Average

A–N

: 1.079 ohms

B–N

: 1.078 ohms

C–N

: 1.077 ohms :

Average Phase resistance (AT 75  C) :

1.26

ohms

**

Winding Resistance measured by Eltel TRWM-5 Digital Transformer Winding Resistance Meter, manufactured by Eltel Industries, Bangalore, India.

**

Calibrated by Cali-Labs, Bhopal, India, Calibration due on 28-08-2012. Test Performed by Sajal Rahman Azad Assistant Engineer, (Testing)

Checked by Asim Kumar Bhakta Manager ,(Testing), EELF

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E N E R G Y P A C E N G I N E E R I N G L T D. FORM NO. : Dated :

POWER TRANSFORMER TESTING LABORATORY REF : EELF/TR-30/35 REV : SL. NO: 30/35-4-0023/1700 0001

EELF /11 30-09-11

Measurement of No-Load Loss and No-Load Current Transformer is energized from LV side. Test Frequency Tap Position

% of Nominal Voltage 100

: :

Test Voltage RMS (V)

No-Load Current IO (A)

Va-b =11000

Ia =2.35 Ib =2.42 Ic =2.94

Vb-c=11000

No Load Loss

Watt meter Reading (W1) ( KW )

50 Hz 9 [Principal Tap]

Watt meter Reading (W2) ( KW )

Watt meter Reading (W3) ( KW )

Remarks CT Ratio =3

5.2

=

27.7

4.2

18.3

PT Ratio =55

KW

**

No-Load Loss measured by Digital Power Analyzer WT-230, manufactured by YOKOGAWA, Japan

**

Digital Power Analyzer WT-230 Calibrated by Cali-Labs, Bhopal, India, Calibration due on 28-082012.

Test Performed by Sajal Rahman Azad Assistant Engineer, (Testing)

Checked by Asim Kumar Bhakta Manager ,(Testing), EELF

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E N E R G Y P A C E N G I N E E R I N G L T D.

POWER TRANSFORMER TESTING LABORATORY REF : EELF/TR-30/35 REV : SL. NO: 30/35-4-0023/1700 0001

FORM NO. : Dated :

EELF /11 30-09-11

Measurement of Impedance Voltage and Load Loss Test Voltage Frequency Reference base HV Tap Position

: : :

50 Hz 30 MVA under ONAN 9 [Principal Tap]

Supply from LV Side with HV Side shorted at Principal Tap at Rated Current Temperature : Rated Current (A) 1574.6

Applied Current (A)

IA = 1135 IB = 1146 IC = 1137 IAVG =1139

30  C Applied Voltage (V) VA-N = 623 VB-N = 642 VC-N = 615 VAVG = 627

Watt meter Reading (W1)

Watt meter Reading (W2)

Watt meter Reading (W3)

35

31

38

Remarks CT Ratio= 300 PT Ratio=10

At 30C Load loss (KW)

=

( 35+31+38 )*(1574.6/1139 )2 = 198.761

% Resistance

=

0.662

% Reactance

=

13.631

% Impedance

=

13.648

Impedance Voltage =

627*1.732*1574.6/1139 V =1501.28

**

Load Loss measured by Digital Power Analyzer WT-230, manufactured by YOKOGAWA, Japan

**

Digital Power Analyzer WT-230 Calibrated by Cali-Labs, Bhopal, India, Calibration due on 28-082012 .

Test Performed by Sajal Rahman Azad Assistant Engineer, (Testing)

Checked by Asim Kumar Bhakta Manager ,(Testing), EELF

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E N E R G Y P A C E N G I N E E R I N G L T D.

POWER TRANSFORMER TESTING LABORATORY REF : EELF/TR-30/35 REV : SL. NO: 30/35-4-0023/1700 0001

FORM NO. : Dated :

EELF /11 30-09-11

Required Formula for various Calculation:

1) Load loss (At normal Temp) = (W1+W2+W3) 2) Temperature factor = (235 + 75) / (235 + tC) 3) % Impedance at normal temp. = Impedance Voltage * 100 / Rated Voltage 4) % Resistance at normal temp. = Load loss /10*Rated KVA 5) % Reactance = Sqrt (% Impedance at normal temp2 - % Resistance at normal temp2) % Impedance at 75C = Sqrt (% Reactance2 +% Resistance at 75C2 )

Test Performed by Sajal Rahman Azad Assistant Engineer, (Testing)

Checked by Asim Kumar Bhakta Manager ,(Testing), EELF

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E N E R G Y P A C E N G I N E E R I N G L T D.

POWER TRANSFORMER TESTING LABORATORY REF : EELF/TR-30/35 REV : SL. NO: 30/35-4-0023/1700 0001

FORM NO. : Dated :

EELF /11 30-09-11

CALCULATION OF LOAD LOSS & IMPEDENCE FROM WINDING RESISTENCE ._______________

AT NORMAL TAP POSITION : 9 (30 MVA BASE) HV I*I*R LOSS AT 30  C LV I*I*R LOSS AT 30  C

= 3*131.212*1.078 = 55.676 KW = 3*909.092*0.01835 = 45.521 KW

I*I*R LOSS AT 30  C MEASURED LOAD LOSS AT 30  C STRAY LOSS AT 30  C

= 55.676+45.521

I*I*R LOSS AT 75  C STRAY LOSS AT 75  C

= 198.671– 101.197

= 101.197 = 198.671 =97.474

KW. KW KW.

= 101.197 [(235+75)/(235+30)] = 118.299 KW = 97.474 /[(235+75)/(235+30)] =83.382 KW.

LOAD LOSS AT 75  C = I*I*R LOSS AT 75  C + STRAY LOSS AT 75  C = 201.681 KW. LOAD LOSS AT 75  C (35 MVA Base) =201.681*(35/30)2 =274.51 KW CALCULATION OF % IMPEDENCE: % % % %

RESISTENCE AT 30  C = LOAD LOSS / (10*KVA) = 198671/(10*30000) IMPEDENCE AT 30 C = (IMPEDENCE VOLTAGE / RATED VOLTAGE) * 100 REACTANCE = SQRT. [(% IMPEDENCE AT 30  C )2 - (% RESISTENCE AT 30  C) 2 ] RESISTENCE AT 75  C = LOAD LOSS AT 75  C/(10*KVA) = 201681 /(10*30000)

= 0.662 = 13.648 = 13.631 = 0.672

% IMPEDENCE AT 75  C = SQRT.[( % REACTANCE )2 + (% RESISTENCE AT 75  C) 2 ] = 13.648 % IMPEDENCE AT 75  C (35 MVA Base)

Test Performed by Sajal Rahman Azad Assistant Engineer, (Testing)

= 13.648*35/30 =15.922

Checked by Asim Kumar Bhakta Manager ,(Testing), EELF

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E N E R G Y P A C E N G I N E E R I N G L T D.

POWER TRANSFORMER TESTING LABORATORY REF : EELF/TR-30/35 REV : SL. NO: 30/35-4-0023/1700 0001

FORM NO. : Dated :

EELF /11 30-09-11

Vector Group Test Terminals C and c joined together. Voltage across the terminals VA-B = 401 V VB-C = 401 V VC-A= 398 V

Voltage measured across

:

Terminal B – a= 373 V Terminal B – b = 373 V Terminal A – a = 374 V Terminal A – b= 407 V

As the terminal voltage across A-b > Voltage across All Other Terminals & B-b = A-a = B-a , The Vector Group Test is confirmed as YNd1. **

Voltage measured by HIOKI 3261 Digital Meter, manufactured by HIOKI, Japan , Calibrated by Cali-Labs, Bhopal, India, Calibration due on 28-08-2012 .

Test Performed by Sajal Rahman Azad Assistant Engineer, (Testing)

Checked by Asim Kumar Bhakta Manager ,(Testing), EELF

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E N E R G Y P A C E N G I N E E R I N G L T D.

POWER TRANSFORMER TESTING LABORATORY REF : EELF/TR-30/35 REV : SL. NO: 30/35-4-0023/1700 0001

FORM NO. : Dated :

EELF /11 30-09-11

Power Frequency (Separate Source Voltage) Withstand Test LV / HV + Earth

:

22 kV at 50Hz for 60 seconds

The Transformer withstood the test successfully.

**

High voltage test is Performed by 500 kV High Voltage Transformer , manufactured by JIANGDU SHENGHUA HIGH VOLTAGE ELECTRICAL EQUIPMENT CO., China , by Cali-Labs, Bhopal, India, Calibration due on 28-08-2012.

Test Performed by Sajal Rahman Azad Assistant Engineer, (Testing)

Checked by Asim Kumar Bhakta Manager ,(Testing), EELF

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E N E R G Y P A C E N G I N E E R I N G L T D.

POWER TRANSFORMER TESTING LABORATORY REF : EELF/TR-30/35 REV : SL. NO: 30/35-4-0023/1700 0001

FORM NO. : Dated :

EELF /11 30-09-11

Combined Induced Over Voltage Withstand Test & Power frequency withstand test HV Tap Position :1

Applying 16.835 KV across a-b Terminal , Keeping B-C shorted & earthed @ 150 HZ For 40 Sec Ia = 3.56 Amp

Voltage measured in Terminal A = 275 KV Applying 16.835 KV across b-c Terminal , Keeping C - A shorted @ 150 HZ For 40 Sec Ib = 3.4 Amp

Voltage measured in Terminal B = 275 KV Applying 16.835 KV across c - a Terminal , Keeping A -B shorted @ 150 HZ For 40 Sec Ic = 3.51 Amp

Voltage measured in Terminal C = 275 KV Remarks : The Transformer withstood the test successfully. **

All data of Induced Over Voltage Withstand test is measured by Digital Power Analyzer WT-230 manufactured by YOKOGAWA , Japan

**

Digital Power Analyzer WT-230 Calibrated by Cali-Labs, Bhopal, India, Calibration due on 28-08-2012.

Test Performed by Sajal Rahman Azad Assistant Engineer, (Testing)

Checked by Asim Kumar Bhakta Manager ,(Testing), EELF

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E N E R G Y P A C E N G I N E E R I N G L T D.

POWER TRANSFORMER TESTING LABORATORY REF : EELF/TR-30/35 REV : SL. NO: 30/35-4-0023/1700 0001

FORM NO. : Dated :

EELF /11 30-09-11

TEST OF OLTC

1.

OPEERATION BY HANDLE ……………………………………………

OK _____________

2.

RAISE OPERATION

………………………………………………………………..

_____________

3.

LOWER OPERATION ………………………………………………………………..

_____________

4.

STEP-BY-STEP OPERATION AT LOAD CONDITION ……………………..

_____________

5.

TAP POSITION INDICATOR

………………………………………………..

_____________

6.

EARTHING POINT

……………………………………………………………

_____________

7.

VISIUAL CHECK

……………………………………………………………

_____________

OK OK OK OK OK OK

Test Performed by Sajal Rahman Azad Assistant Engineer, (Testing)

Checked by Asim Kumar Bhakta Manager ,(Testing), EELF

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E N E R G Y P A C E N G I N E E R I N G L T D. FORM NO. : Dated :

POWER TRANSFORMER TESTING LABORATORY REF : EELF/TR-30/35 REV : SL. NO: 30/35-4-0023/1700 0001

EELF /11 30-09-11

Measurement of Di Electric strength of Transformer Oil

Testing method

:

BS-148

Temperature

:

30c

Sample No. 01

Electrode Gap ( mm ) 2.5 2.5 2.5

Break Down Voltage in KV 60 60 60

Average Value in KV

REMARKS

60

Satisfactory

#

Break down Voltage 32 KV is considered to be satisfactory. Bellow this level oil is prescribed to be centrifuged.

**

Di Electric strength of Transformer Oil is measured by FosterTM (Model OTS 60 AF ) Made in China, Calibrated by Cali-Labs, Bhopal, India, Calibration due on 28-08-2012.

Test Performed by Sajal Rahman Azad Assistant Engineer, (Testing)

Checked by Asim Kumar Bhakta Manager ,(Testing), EELF

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E N E R G Y P A C E N G I N E E R I N G L T D. FORM NO. : Dated :

POWER TRANSFORMER TESTING LABORATORY REF : EELF/TR-30/35 REV : SL. NO: 30/35-4-0023/1700 0001

EELF /11 30-09-11

Summary of Test Results Serial No 01 02 03 04 05 06 07 08 09 10

11 12

Particulars

Units

Visual Inspection Measurement of Insulation Resistance Measurement of Turn-ratio Measurement of Winding Resistance No-load Loss Load Loss at Principal Tap Position 9 ( 35 MVA Base ) Impedance at Principal Tap position 9 ( 35 MVA Base ) Vector Group Test

Remarks OK

Mega-ohms

OK OK OK

KW KW %

Power Frequency Withstand Test Combined Induced Over Voltage & Power frequency Withstand Test Test of On Load Tap Changer Di-Electric strength kV measurement of Transformer Oil

Test Performed by

27.7 274.51

OK OK

15.922

OK

YNd1

OK Withstood Withstood

OK 60

Satisfactory

Checked by

Sajal Rahman Azad Assistant Engineer, (Testing)

Prepared by :

Measured Value

Asim Kumar Bhakta Manager ,(Testing), EELF

Witnessed by :

Approved by :