13eku /luv 2p:(1+0 For the following power system, all the impedances are in p.u, except for Zn. Assume pre-fault voltage=1.0 p.u. 3 Lond Line (Sbase X= lo4 20MUA 138kv /buv Zp:(I+jo) A Bas Xu: 30l -- Single-lihe Drayram, a. Draw the sequence networks b. Using the sequence networks, find: i. Pre-fault phase currents (in p.u, with angles). ii. Three-Phase short-circuit phase currents (in p.u. with angles) for a fault at: (Neglect pre-fault currents and assume pre-fault voltage=1.0 p.u.) 1. Bus 2 2. Bus 3 ii. Short-Circuit Capacity (assume VI=1.0 p.u. for each bus) at: 1. Bus 2 2. Bus 3 3. Explain why the SCC of Bus 2 is greater than SCC of bus 3.

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1- For the following power system, all the impedances are in p.u, except for Zn.
Assume pre-fault voltage=1.0 p.u.
13.8kv
Loud
3
Line
2OMUA
YBase 138ku
O Gen.
2SMV A X,= lou
Zp-(I+jo),
138kv /uv
Xu: 30l
Single-Iihe Decgrann.
.
a. Draw the sequence networks
b. Using the sequence networks, find:
i. Pre-fault phase currents (in p.u, with angles).
ii. Three-Phase short-circuit phase currents (in p.u. with angles) for a fault at:
(Neglect pre-fault currents and assume pre-fault voltage=1.0 p.u.)
1. Bus 2
2. Bus 3
ii. Short-Circuit Capacity (assume VI=1.0 p.u. for each bus) at:
1. Bus 2
2.
Bus 3
3. Explain why the SCC of Bus 2 is greater than sCC of bus 3.
Transcribed Image Text:1- For the following power system, all the impedances are in p.u, except for Zn. Assume pre-fault voltage=1.0 p.u. 13.8kv Loud 3 Line 2OMUA YBase 138ku O Gen. 2SMV A X,= lou Zp-(I+jo), 138kv /uv Xu: 30l Single-Iihe Decgrann. . a. Draw the sequence networks b. Using the sequence networks, find: i. Pre-fault phase currents (in p.u, with angles). ii. Three-Phase short-circuit phase currents (in p.u. with angles) for a fault at: (Neglect pre-fault currents and assume pre-fault voltage=1.0 p.u.) 1. Bus 2 2. Bus 3 ii. Short-Circuit Capacity (assume VI=1.0 p.u. for each bus) at: 1. Bus 2 2. Bus 3 3. Explain why the SCC of Bus 2 is greater than sCC of bus 3.
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