Transformer Test Report

TMM-2A TEST REPORT KVA 6000

Volts (No Load) HV LV 11000 3450

Transformer Nameplate Phases

Amperes HV 314.9

LV 1004.1

HV 3

1. Vector Group Dyn11 Identification

R 415 V Y 415 V B H.V. Side

L.V. Side

Dyn11 Conditions RY = Rn + nY Yb = Yy Bb < By

Vector Group Dyn11 Identification Test Details (On Tap Position 3) Before T/F Overhauling 416 = 75 + 341 310 = 310 311 < 438 Voltage Ratio Test

Tap Position 1 2 3 4 5

Voltage(RY) 416 417 416 416 416

Before T/F Overhauling HV Side Voltage(YB) Voltage(BR) Voltage(rn) 418 417 71.9 418 417 73.8 418 417 75.7 418 417 77 418 417 79.9

Voltage(RY) 417 242 95

Before T/F Overhauling HV Side Voltage(YB) Voltage(BR) Voltage(rn) 338.4 79.6 75.7 418 177 43 322 417 17

LV Side Voltage(yn) 72.1 74 76 78 80

Magnetic Balance Te

Tap Position 3 3 3

Components LV – E (1 KV) HV – E (5 KV)

LV Side Voltage(yn) 61 76 58

Insulation Resistance & Polarisation Index (Mete Before T/F Overhauling IR (1 Minute) IR (10 Minutes) PI (10 Minutes) 688 MΩ 807 MΩ 1.17 994 MΩ 1.08 GΩ 1.08

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TMM-2A TEST REPORT HV – LV (5 KV)

544 MΩ

550 MΩ

1.01

Winding Resistance Meas Before T/F Overhauling (With Analog Motor Checker at Knob Position 4) Text HV Side LV Side Actual Value (%) 20 20 20 18 18 Calculated Value(Ω) 0.40 0.40 0.40 0.36 0.36

BD Value Before T/F Overhauling(KV) - Old Oil 19

After T/F Overhauling(KV) – New Oil 60

Tan Delta Testing (After T/F O HV Side Mode UST UST GST GST GST-G GST-G

Voltage (KV) 2 6 2 6 2 6

Capacitane (pf) 6095 6097 8223 8223 2126 2126

Note – Magnetising current test is not carried out before overhauling. Prepared By: Checked By:

Mr. Suraj Pal

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Tan Delta (%) 5.505 5.505 4.639 4.638 2.165 2.163

TMM-2A TEST REPORT Transformer Nameplate Details Phases LV Diagram No. 3 RDM1087

Maker's serial no. M1087/1

Type of Frequency Cooling (Hz) ONAN 50

Impedance Volts 7.09

Connection Symbols Dyn11

ctor Group Dyn11 Identification Test R r y

r

R,r

30o n

b n

y b y b B

Y

B

Y

(On Tap Position 3) After T/F Overhauling 419 = 76 + 343 311 = 312 312 < 340 Voltage Ratio Test

Voltage(RY) 418 418 418 419 419

After T/F Overhauling HV Side Voltage(YB) Voltage(BR) Voltage(rn) 419 418 72 419 418 74 419 418 76 420 419 78 420 419 80

LV Side Voltage(yn) 72 74 76 78 80

Voltage(RY) 418 240 86

After T/F Overhauling HV Side Voltage(YB) Voltage(BR) Voltage(rn) 346 73 76 419 179 43 332 418 15

LV Side Voltage(yn) 62 76 60

LV Side Voltage(bn) 72 73.8 75.8 77.9 79.9

Tap Position 1 2 3 4 5

Magnetic Balance Test LV Side Voltage(bn) 14 32 75.9

Tap Position 3 3 3

tance & Polarisation Index (Meter Serial No. - METMD1-10-002) PI (10 Minutes) 1.17 1.08

Components LV – E (1 KV) HV – E (5 KV)

IR (1 Minute) 835 MΩ 951 MΩ

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After T/F Overhauling IR (10 Minutes) 930 MΩ 1.01 GΩ

PI (10 Minutes) 1.11 1.06

TMM-2A TEST REPORT 1.01

HV – LV (5 KV)

Winding Resistance Measurement ition 4) LV Side 17 rn (mΩ) 0.34 5.11

Parameter Current (mA)

391 MΩ

397 MΩ

1.01

After T/F Overhauling (With Vendor's Resistance Meter) LV Side HV Side yn (mΩ) bn (mΩ) Tap Position RY (mΩ) YB (mΩ) 5.13 5.27 1 123.1 122.0 2 119.9 118.9 3 116.7 115.8 4 114.3 113.7 5 111.5 110.3

Magnetising Current Test ( After T/F Overhauling ) HV Side (LV Open) LV Side (HV Open) R Y B Parameter r y 44 30 32 Current (A) 0.61 0.66

Tan Delta Testing (After T/F Overhauling) Tan Delta (%) 5.505 5.505 4.639 4.638 2.165 2.163

Mode UST UST GST GST GST-G GST-G

Voltage (KV) 1 2 1 2 1 2

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LV Side Capacitane (pf) 6100 6100 9961 9960 3860 3860

Tan Delta (%) 5.508 5.508 4.689 4.690 3.395 3.397

TMM-2A TEST REPORT Year Manuf. 1993

of

LV Side Voltage(bn) 72 74 76 78 80

LV Side Voltage(bn) 13 32 76

PI (10 Minutes) 1.11 1.06

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TMM-2A TEST REPORT 1.01

er) de BR (mΩ) 123.0 119.8 116.7 113.8 110.9

V Open) b 0.67

Tan Delta (%) 5.508 5.508 4.689 4.690 3.395 3.397

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