Power Transformer Testing Format
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TEST REPORT FOR POWER TRANSFORMER Location: POWER TRANSFORMER ROOM
LARSEN & TOUBRO LTD.
DATE : 12/10/2019
CLIENT: M/s. INDIAN OIL CORPORATION LIMITED - IOCL. PROJECT : LPG BOTTLING PLANT AT GORKHPUR, UP
Sheet No 1 of 4
Location: POWER TRANSFORMER i.
GENERAL DETAILS NAME PLATE DETAILS Make
Serial No.
: - DT6272/ 01
Manufacturing Year Rated Power
: - 10/2018
Total Mass
: - 1600 KVA
Location
: Power Transformer :
Rated Voltage
: - 11000 V (HV)
Rated Current
: - 83.98 A (HV)
: - 433 V (LV) No. of Phase Winding Material Temperature rise Type of tap charger ii.
:-3 : - Copper
: - CG Power & Industrial Solution Ltd. : - 5800 Kg
: - 2133.4 A (LV) : - 50 Hz : - ONAN
: - 40°C (OIL) & 45°C (WDG)
Frequency Type of cooling Impedance
: - OFF load tap charger
Vector group
: - Dyn11
: - 6.48 % (HV-LV)
INSULATION RESISTANCE TEST
Reference Winding HV – EARTH
Applied Voltage 5000 V DC
IR value in G ohms 60 secs 600 secs 2.98 4.44
Polarization Index PI = 600s/60s 1.48
HV – LV
5000 V DC
3.14
6.27
2.0
LV – EARTH
500 V DC
>1GΩ
-
-
iii. WINDING RESISTANCE TEST LV side OTI: 42 oC Winding
WTI: 40 oC Resistance (mΩ) Site value @ 40 °C
2u – 2n
63 mΩ
2v – 2n
62 mΩ
2w – 2n
62 mΩ
Tested By L&T Name: SARAVANAN.A SIGN :
Witnessed by L&T Name: Mr. SATYENDRA KUMAR SIGN :
Client by IOCL Name: SIGN :
TEST REPORT FOR POWER TRANSFORMER Location: POWER TRANSFORMER ROOM
LARSEN & TOUBRO LTD.
DATE : 12/10/2019
CLIENT: M/s. INDIAN OIL CORPORATION LIMITED - IOCL. PROJECT : LPG BOTTLING PLANT AT GORKHPUR, UP
Sheet No 2 of 4
OTI: 42 oC Resistance (mΩ) Site value @ 40 °C
HV side Tap Position
WTI:
40 oC
U-V
V-W
W-U
1(MAX)
176 mΩ
178 mΩ
172 mΩ
2
189 mΩ
189 mΩ
192 mΩ
3(N)
204 mΩ
202 mΩ
206 mΩ
4
214 mΩ
216 mΩ
215 mΩ
5(MIN)
239 mΩ
227 mΩ
228 mΩ
iv.
MAGNETISING CURRENT TEST Applied voltage on HV side (V) IU – IV 1V – IW 1W – 1U
Tap Position
1U
Measured current in mA 1V 1W
1(MAX)
409
412
411
11.1
8.3
9.5
3(N)
409
412
411
11.9
8.9
9.9
5(MIN)
409
412
411
12.7
9.3
10.6
v. Voltage applied at
MAGNETIC BALANCE TEST Voltage measured at HV (V) 1U-1V 1V-1W 1W-1U
2u-2v
Voltage measured at LV (V) 2v-2w
2w-2u
Roff
226
410
184
14.23
13.50
0.908
Yoff
136
270
409
2.94
15.43
12.53
Boff
410
286
123
15.77
3.65
12.12
Tested By L&T Name: SARAVANAN.A SIGN :
Witnessed by L&T Name: Mr. SATYENDRA KUMAR SIGN :
Client by IOCL Name: SIGN :
TEST REPORT FOR POWER TRANSFORMER Location: POWER TRANSFORMER ROOM
LARSEN & TOUBRO LTD.
DATE : 12/10/2019
CLIENT: M/s. INDIAN OIL CORPORATION LIMITED - IOCL. PROJECT : LPG BOTTLING PLANT AT GORKHPUR, UP vi.
Sheet No 3 of 4
VECTOR GROUP TEST
Short the terminal 1U & 2U & apply 3 phase 415 volts across the HV terminals.
Vector Group: Dyn11 Measured between
Measured values (V)
Condition
Measured between
Measured values (V)
1U-1V
412
Input
1V-1W
412
1W-1U
411
Input
-
0
W1W2
392
<
V2W1
410
U12N+ 2NV1
9.22+398
=
U1V1
406.8
U1V1
405
=
U1W1
406
Vector group Dyn11 is confirmed: YES vii. Tap position
VOLTAGE RATIO TEST Applied Voltage in side HV (V) AC 1U-1V 1V-1W 1W-1U
Measured voltage in LV side (V) AC 2U-2V 2V-2W 2W-2U
Measured voltage in LV side (V) AC 2U-2N 2V-2N 2W-2N
1(MAX)
409
412
411
15.6
15.4
15.5
8.7
8.9
8.9
2
410
411
411
16.0
15.9
15.89
9.04
9.01
8.9
3(NOR)
409
412
409
16.35
16.26
16.20
9.31
9.27
9.31
4
409
412
411
16.72
16.72
16.71
9.53
9.57
9.60
5(MIN)
409
412
411
17.2
17.16
17.04
9.72
9.84
9.75
viii.
TRANSFORMER AUXILIARY PROTECTION CHECK
Tested By L&T Name: SARAVANAN.A SIGN :
Witnessed by L&T Name: Mr. SATYENDRA KUMAR SIGN :
Client by IOCL Name: SIGN :
TEST REPORT FOR POWER TRANSFORMER Location: POWER TRANSFORMER ROOM
LARSEN & TOUBRO LTD.
DATE : 12/10/2019
CLIENT: M/s. INDIAN OIL CORPORATION LIMITED - IOCL. PROJECT : LPG BOTTLING PLANT AT GORKHPUR, UP
Sheet No 4 of 4
Protection elements
Operation check up to HT PANEL
1.
Buchholz Alarm
Ok
2.
Winding Temperature High Alarm (WTI)
Ok
3.
Oil Temperature High Alarm
Ok
4.
MOG Alarm
Ok
5.
Buchholz Trip
Ok
6.
Oil Temperature High Trip
Ok
ix.
GENERAL CHECK Description
Operation check
1.
Check for any leakage of oil
No
2.
Check for any mechanical damage
No
3.
Check for tightness of terminal & connections
Okay
4.
Check for condition of silica gel
Blue / try
SETTINGS 1.
Setting of OTI alarm
85oC
2.
Setting of OTI trip
90oC
3.
Setting of WTI alarm
95oC
4.
Setting of WTI trip
100oC
x.
TRANSFORMER IS FIT FOR COMMISSIONING YES
Tested By L&T Name: SARAVANAN.A SIGN :
Witnessed by L&T Name: Mr. SATYENDRA KUMAR SIGN :
Client by IOCL Name: SIGN :
LARSEN & TOUBRO LTD.
DATE : 12/10/2019
CLIENT: M/s. INDIAN OIL CORPORATION LIMITED - IOCL. PROJECT : LPG BOTTLING PLANT AT GORKHPUR, UP
Sheet No 1 of 4
Location: POWER TRANSFORMER i.
GENERAL DETAILS NAME PLATE DETAILS Make
Serial No.
: - DT6272/ 01
Manufacturing Year Rated Power
: - 10/2018
Total Mass
: - 1600 KVA
Location
: Power Transformer :
Rated Voltage
: - 11000 V (HV)
Rated Current
: - 83.98 A (HV)
: - 433 V (LV) No. of Phase Winding Material Temperature rise Type of tap charger ii.
:-3 : - Copper
: - CG Power & Industrial Solution Ltd. : - 5800 Kg
: - 2133.4 A (LV) : - 50 Hz : - ONAN
: - 40°C (OIL) & 45°C (WDG)
Frequency Type of cooling Impedance
: - OFF load tap charger
Vector group
: - Dyn11
: - 6.48 % (HV-LV)
INSULATION RESISTANCE TEST
Reference Winding HV – EARTH
Applied Voltage 5000 V DC
IR value in G ohms 60 secs 600 secs 2.98 4.44
Polarization Index PI = 600s/60s 1.48
HV – LV
5000 V DC
3.14
6.27
2.0
LV – EARTH
500 V DC
>1GΩ
-
-
iii. WINDING RESISTANCE TEST LV side OTI: 42 oC Winding
WTI: 40 oC Resistance (mΩ) Site value @ 40 °C
2u – 2n
63 mΩ
2v – 2n
62 mΩ
2w – 2n
62 mΩ
Tested By L&T Name: SARAVANAN.A SIGN :
Witnessed by L&T Name: Mr. SATYENDRA KUMAR SIGN :
Client by IOCL Name: SIGN :
TEST REPORT FOR POWER TRANSFORMER Location: POWER TRANSFORMER ROOM
LARSEN & TOUBRO LTD.
DATE : 12/10/2019
CLIENT: M/s. INDIAN OIL CORPORATION LIMITED - IOCL. PROJECT : LPG BOTTLING PLANT AT GORKHPUR, UP
Sheet No 2 of 4
OTI: 42 oC Resistance (mΩ) Site value @ 40 °C
HV side Tap Position
WTI:
40 oC
U-V
V-W
W-U
1(MAX)
176 mΩ
178 mΩ
172 mΩ
2
189 mΩ
189 mΩ
192 mΩ
3(N)
204 mΩ
202 mΩ
206 mΩ
4
214 mΩ
216 mΩ
215 mΩ
5(MIN)
239 mΩ
227 mΩ
228 mΩ
iv.
MAGNETISING CURRENT TEST Applied voltage on HV side (V) IU – IV 1V – IW 1W – 1U
Tap Position
1U
Measured current in mA 1V 1W
1(MAX)
409
412
411
11.1
8.3
9.5
3(N)
409
412
411
11.9
8.9
9.9
5(MIN)
409
412
411
12.7
9.3
10.6
v. Voltage applied at
MAGNETIC BALANCE TEST Voltage measured at HV (V) 1U-1V 1V-1W 1W-1U
2u-2v
Voltage measured at LV (V) 2v-2w
2w-2u
Roff
226
410
184
14.23
13.50
0.908
Yoff
136
270
409
2.94
15.43
12.53
Boff
410
286
123
15.77
3.65
12.12
Tested By L&T Name: SARAVANAN.A SIGN :
Witnessed by L&T Name: Mr. SATYENDRA KUMAR SIGN :
Client by IOCL Name: SIGN :
TEST REPORT FOR POWER TRANSFORMER Location: POWER TRANSFORMER ROOM
LARSEN & TOUBRO LTD.
DATE : 12/10/2019
CLIENT: M/s. INDIAN OIL CORPORATION LIMITED - IOCL. PROJECT : LPG BOTTLING PLANT AT GORKHPUR, UP vi.
Sheet No 3 of 4
VECTOR GROUP TEST
Short the terminal 1U & 2U & apply 3 phase 415 volts across the HV terminals.
Vector Group: Dyn11 Measured between
Measured values (V)
Condition
Measured between
Measured values (V)
1U-1V
412
Input
1V-1W
412
1W-1U
411
Input
-
0
W1W2
392
<
V2W1
410
U12N+ 2NV1
9.22+398
=
U1V1
406.8
U1V1
405
=
U1W1
406
Vector group Dyn11 is confirmed: YES vii. Tap position
VOLTAGE RATIO TEST Applied Voltage in side HV (V) AC 1U-1V 1V-1W 1W-1U
Measured voltage in LV side (V) AC 2U-2V 2V-2W 2W-2U
Measured voltage in LV side (V) AC 2U-2N 2V-2N 2W-2N
1(MAX)
409
412
411
15.6
15.4
15.5
8.7
8.9
8.9
2
410
411
411
16.0
15.9
15.89
9.04
9.01
8.9
3(NOR)
409
412
409
16.35
16.26
16.20
9.31
9.27
9.31
4
409
412
411
16.72
16.72
16.71
9.53
9.57
9.60
5(MIN)
409
412
411
17.2
17.16
17.04
9.72
9.84
9.75
viii.
TRANSFORMER AUXILIARY PROTECTION CHECK
Tested By L&T Name: SARAVANAN.A SIGN :
Witnessed by L&T Name: Mr. SATYENDRA KUMAR SIGN :
Client by IOCL Name: SIGN :
TEST REPORT FOR POWER TRANSFORMER Location: POWER TRANSFORMER ROOM
LARSEN & TOUBRO LTD.
DATE : 12/10/2019
CLIENT: M/s. INDIAN OIL CORPORATION LIMITED - IOCL. PROJECT : LPG BOTTLING PLANT AT GORKHPUR, UP
Sheet No 4 of 4
Protection elements
Operation check up to HT PANEL
1.
Buchholz Alarm
Ok
2.
Winding Temperature High Alarm (WTI)
Ok
3.
Oil Temperature High Alarm
Ok
4.
MOG Alarm
Ok
5.
Buchholz Trip
Ok
6.
Oil Temperature High Trip
Ok
ix.
GENERAL CHECK Description
Operation check
1.
Check for any leakage of oil
No
2.
Check for any mechanical damage
No
3.
Check for tightness of terminal & connections
Okay
4.
Check for condition of silica gel
Blue / try
SETTINGS 1.
Setting of OTI alarm
85oC
2.
Setting of OTI trip
90oC
3.
Setting of WTI alarm
95oC
4.
Setting of WTI trip
100oC
x.
TRANSFORMER IS FIT FOR COMMISSIONING YES
Tested By L&T Name: SARAVANAN.A SIGN :
Witnessed by L&T Name: Mr. SATYENDRA KUMAR SIGN :
Client by IOCL Name: SIGN :
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