POWER SYSTEM ANALYSIS TADP 641
Transcript of POWER SYSTEM ANALYSIS TADP 641
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POWER SYSTEM ANALYSIS
TADP 641
Case Example
SHORT CIRCUIT
CALCULATION
Juan Manuel Gers, PhD
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Example
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Example
Calculate the short circuit current for a three phase fault at busbar D.
Consider that the Hydro Power Station is under maintenance and therefore all the breakers associated are open.
Let base MVA = 75 MVA
Let base kV on 132 kV nominal part of system = 132 kV
The base kV on other parts of the system is obtained by referring this voltage through the interconnecting transformers.
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Example Solution
SUPPLYGRID
G3
G4
G5
G6
E'
T9
T10
T17
T18
T16
T15
E
D6
T20
T21
T13T11
D4B
D4A
T12
F'
F
D5
DT7
T8
D'
D2
C C'
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Positive Secuence Diagram for Fault at Busbar D
NEUTRAL BUS ' N '
E
G6
G5
G4
G3
T18
T17
T16
T15
FI
F
D5
D4B
D4A
D6
E
T10
T9
E'
SZ
D
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Positive Sequence Network
P.U.1E
FI
EE'
Z
F
E
I
AZ
D
ZB
FI
E
A
D
ZC
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Equivalent Impedances
The resulting positive sequence diagram is shown below:
..0712.04
285.0
4
151.0134.0upZ A
..0897.00327.0047.001.01768.0
1335.00433.0
2
094.001.0 up
xZ B
..0397.01607.0
0897.00712.0upZC
..19.250397.0
1up
Z
EI
c
F
Axx
xupcurrentBase 328
101323
1075.).1(
3
6
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Fault Current Calculation
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Solution of Example with Software
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Questions?