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Q: Voltage drop, transformer, 3 phase system ( No Answer,   0 Comments )
Subject: Voltage drop, transformer, 3 phase system
Category: Science > Physics
Asked by: pkuanko-ga
List Price: $5.00
Posted: 14 Aug 2006 18:12 PDT
Expires: 03 Sep 2006 17:50 PDT
Question ID: 756029
A 200MVA 345kV D/34.5 kV Y substation transformer has an 8% leakage
reactance. The transformer links 345kV transmission and 34.5 kV
distribution. Neglect winding R and magnetizing current and source
impedance. Use Tx ratings as base and find
(a) per unit magnitude of voltage drop and low side voltage when rated
current at 0.8 pf lagging enters HV terminals,
(b) For a bolted 3 phase fault (impedance = 0) on LV side, find Fault
MVA (p.u.) (=fault current x nom volts). Note bolted fault means a
short circuit bolted on to the wires at zero impedance.
Please give me full working, I will give you a good tip.
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