Transformer Testing | Type Test and Routine Test of Transformer
Transformer Testing manualFull description
transformer
transformer
Power Transformer Testing and Monitoring Commercial Brochure by OmicronDescripción completa
Transformer basics, construction (very detailed) and aplicationFull description
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Descrição: power transformer
Descripción: Witness Testing procedure for ABB Transformer. 1. Ratio, Polarity Phase sequence Test 2.Volatge Withstand Test 3.Measurement of No Load Loss And No Load Current 4. Induced Voltage Withstand Tes...
POWER TRANSFORMER 1 Insulation Resistance Measurement Procedure a. For LT systems, use only 500V or 1000V Megger. b. For MV & HV systems, use 2500V or 5000V Megger. c. Remove Earth from Transformer neutral. d. Measure as per table below.
1
2
Circuit
1W
2
1U - E 2U - E 1U - 2U
1
2
1
2
Megger Used MV & HV 5kV 5kV 5kV
2 Winding Resistance Measurement WINDING RESISTANCE METER
I I1
I P1
I P2
I I2
Circuit 1U-1N 1V-1N 1W-1N 2U-2N 2V-2N 2W-2N
1
2
1
2
1W
1
2
2
Tap No Resistance Ω All Taps
3 Magnetic Current Test
415 V AC
mA
1
2
1W
2
1
2
1
2
mA
mA
mA
Applied Voltage 1U-1V 1V-1W 1W-1U 1U-1N, 1V-1N,1W-1N
Measured Current 1U 1V 1W 1N
1
2
1W
2
1
2
1
2
Applied Voltage Measured Voltage 1U1N 1V1N 1W1N 1U1N 1V1N 1W1N 2U2N 415 415 415 Applied Voltage Measured Voltage 1U1V 1V1W 1W1U 1U1V 1V1W 1W1U 2U2V 415 415 415 -
2V2N
2W2N
2V2W
2W2U
Measured voltage
415 V AC
4 Magnetic Balance Test
5 Vector Group Confirmation. Dyn1
1U 2U
1U 2W
2n
2U
2V
2W 2V
1V 1
1V
1
Conditions: 1 -1U and 2u should be shorted. 2 -Apply 415V to 1U,1V&1W 3 -Satisfy the following conditions. 1U1W = 1U2n + 1W2n 1W2w = 1W2V 1V2v < 1V2w
Dyn11 1U
1U
2U 2n
2U
2V 2W 2V
2W
1
1V 3 -Satisfy the following conditions. 1U1V = 1U2n + 1V2n 1V2w = 1V2v 1W2w < 1W2v
1
1V
5 Vector Group Confirmation. 1U 2U
Ynd1
1U 2W 2V 2U 2W
1N 2V
1
1
1V
1V
3 -Satisfy the following conditions. 1U1N = 1U2v + 2v1N 1W2v = 1V2v 1V2v < 1V2w
YNyn0
1U
1U
2U 2n 2V
2W 2U 1N2n 2W
1
1N 2V
1V 3 -Satisfy the following conditions. 1W2w = 1V2v 1W2n = 1V2n 1U1N = 1U2n + 1N2n
6 7 8 9 10
Short Circuit Test and Differential Stability. REF Stability Test Cooler Circuits Temperature Indicators Calibration Auxilliary Protection Circuits
1
1V
V
6 Short Circuit Test and Differential Stability. Stable Condition.
Apply 3-Ph AC Voltage
N
R
Y
B
Diff Relay P1
S1
300/1 A S2
S1
S2
S1
S2
P2
B-Ph Id Y-Ph Id R-Ph Id P1
S1
500/1 A S1
S1
S2
S2
S2
P2
Temporary Short
Example: Short Circuit Current Calculation. Rating : 100MVA HV Voltage 220 kV Current 262.43 A % of Impedance (%Z) = 8.05%
LV 132kV 437.40 A
HV MVA = LV MVA = 100MVA √3 x 220000 x I1 = √3 x 123000 x I2 = 100,000,000 √3 x 220000 x I1 = 100,000,000 I1 = 100,000,000 / (√3 x 220000) I1 = 262.43A √3 x 123000 x I2 = 100,000,000 I2 = 100,000,000 / (√3 x 132000) I2 = 437.40A %Zv = 8.05% = 220kV x % of impedance = 220000 x (8.05/100) %Zv = 17,710 V If We may apply 415 V to HV side HV I primary = (415 x 262.43) / 17710 HV I primary = 6.15 A HV sec = 6.15 / 300 HV sec = 0.0205A LV I primary = (415 x 437.4) / 17710 LV I primary = 10.25 A LV sec = 10.25 / 500 LV sec = 0.0205 A
