MV design guide - Schneider Electric
MV design guide - Schneider Electric
MV design guide - Schneider Electric
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Design rules<br />
Short-circuit currents<br />
Here is a problem<br />
to solve!<br />
Exercice data<br />
Supply at 63 kV<br />
Short-circuit power of the source: 2 000 <strong>MV</strong>A<br />
c Network configuration:<br />
Two parallel mounted transformers and an alternator.<br />
c Equipment characteristics:<br />
v transformers:<br />
- voltage 63 kV / 10 kV<br />
- apparent power: 1 to 15 <strong>MV</strong>A, 1 to 20 <strong>MV</strong>A<br />
- short-circuit voltage: U sc<br />
= 10 %<br />
v Alternator :<br />
- voltage: 10 kV<br />
- apparent power: 15 <strong>MV</strong>A<br />
- X'd transient: 20 %<br />
- X"d sub-transient: 15 %<br />
c Question:<br />
v determine the value of short-circuit current at the busbars,<br />
v the breaking and closing capacities of the circuit breakers D1 to D7.<br />
Single line diagram<br />
Alternator<br />
15 <strong>MV</strong>A<br />
X'd = 20 %<br />
X''d = 15 %<br />
G1<br />
T1<br />
Transformer<br />
15 <strong>MV</strong>A<br />
Usc = 10 %<br />
63 kV<br />
T2<br />
Transformer<br />
20 <strong>MV</strong>A<br />
Usc = 10 %<br />
D3<br />
D1<br />
10 kV<br />
D2<br />
Busbars<br />
D4 D5 D6 D7<br />
18 Merlin Gerin <strong>MV</strong> <strong>design</strong> <strong>guide</strong> <strong>Schneider</strong> <strong>Electric</strong>
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