100523924 Power Transformer Testing Procedures
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6 Short Circuit Test and Differential Stability. 6 Short Circuit Test and Differential Stability. Stable Condition. Apply 3-Ph AC Voltage Diff Relay P1 S1 300/1 A S2 S1 N R Y B S2 S1 S2 S1 P2 S2 B-Ph Y-Ph R-Ph Id Id P1 S1 500/1 A S1 S2 Id S1 S2 S2 P2 Temporary Short
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Transcript of 100523924 Power Transformer Testing Procedures
6 Short Circuit Test and Differential Stability.6 Short Circuit Test and Differential Stability.
Stable Condition.
Apply 3-Ph AC Voltage
Diff RelayP1 S1
300/1 AS2
S1
N R Y B
S2S1
S2S1
P2 S2
B-Ph
Y-Ph
R-Ph
Id
Id
P1 S1
500/1 AS1
S2
Id
S1S2
S2
P2
Temporary Short
Example:Short Circuit Current Calculation.
Rating : 100MVAHV LV
Voltage 220 kV 132kVCurrent 262.43 A 437.40 A% of Impedance (%Z)
HV MVA = LV MVA = 100MVA
√3 x 220000 x I1 = √3 x 123000 x I2 = 100,000,000√3 x 220000 x I1 = 100,000,000I1 = 100,000,000 / (√3 x 220000)I1 = 262 43A
= 8.05%
I1 = 262.43A
√3 x 123000 x I2 = 100,000,000I2 = 100,000,000 / (√3 x 132000)I2 = 437.40A
%Zv = = 220kV x % of impedance
8.05% 220kV x % of impedance = 220000 x (8.05/100)
%Zv = 17,710 V
If We may apply 415 V to HV sideHV I primary = (415 x 262.43) / 17710HV I primary = 6.15 AHV sec = 6.15 / 300HV 0 0205AHV sec = 0.0205A
LV I primary = (415 x 437.4) / 17710LV I primary = 10.25 ALV sec = 10.25 / 500LV sec = 0.0205 A
Unstable Condition
S1
Apply 3-Ph AC Voltage
S2S1
S2S1
S2
Id
Id
S1
S2
Id
Id
S1S2
S1S2
S2
Temporary Short
