of the receiving-end transformers. Calculate the fault current in the 2 kV feeder lines, in the primary and secondary windings of the receiving-end transformers and at the load terminals (200 V terminals).

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Author:Robert L. Boylestad
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Electrical engineering
Three transformers, each rated 20 kVA, 2 kV/200 V,
are connected A/A and are fed
through a 2000 V (line-to-line) 3-phase feeder
having a reactance of 0.7 ohm/phase. The
reactance of each
transformer is 0.0051 pu. All resistances are to be
ignored. At its sending-end the feeder receives
power
through the secondary terminals of a 3-phase Y/A
connected transformer whose 3-phase rating is
200 kVA,
20/2 kV (line-to-line). The reactance of the
sending-end transformer is 0.06 pu on its own
rating. The
voltage applied to the primary terminals is 20 kV
(line-to-line).
A 3-phase fault takes place at the 200 V terminals
of the receiving-end transformers. Calculate the
fault
current in the 2 kV feeder lines, in the primary and
secondary windings of the receiving-end
transformers
and at the load terminals (200 V terminals).
Transcribed Image Text:Three transformers, each rated 20 kVA, 2 kV/200 V, are connected A/A and are fed through a 2000 V (line-to-line) 3-phase feeder having a reactance of 0.7 ohm/phase. The reactance of each transformer is 0.0051 pu. All resistances are to be ignored. At its sending-end the feeder receives power through the secondary terminals of a 3-phase Y/A connected transformer whose 3-phase rating is 200 kVA, 20/2 kV (line-to-line). The reactance of the sending-end transformer is 0.06 pu on its own rating. The voltage applied to the primary terminals is 20 kV (line-to-line). A 3-phase fault takes place at the 200 V terminals of the receiving-end transformers. Calculate the fault current in the 2 kV feeder lines, in the primary and secondary windings of the receiving-end transformers and at the load terminals (200 V terminals).
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