A 15,000 KVA, 6.9 KV generator, star connected has positive, negative and zero sequence reactances of 0.25, 0.25 and 0.08 p.u. respectively. A reactor of 0.06 p.u. reactance on the generator rating is placed in the line from neutral to ground: A double line to ground fault occurs at the terminals of the generator when it is operating at its rated voltage and unloaded. Find the unitial r.m.s. line and ground wire current for a solidly grounded fault, and also the voltage to ground of the unfaulted line. (UPSC-1975) Ans: L-1,-4970 A; I, 5480 A; V₂=69.7 KV
A 15,000 KVA, 6.9 KV generator, star connected has positive, negative and zero sequence reactances of 0.25, 0.25 and 0.08 p.u. respectively. A reactor of 0.06 p.u. reactance on the generator rating is placed in the line from neutral to ground: A double line to ground fault occurs at the terminals of the generator when it is operating at its rated voltage and unloaded. Find the unitial r.m.s. line and ground wire current for a solidly grounded fault, and also the voltage to ground of the unfaulted line. (UPSC-1975) Ans: L-1,-4970 A; I, 5480 A; V₂=69.7 KV
Power System Analysis and Design (MindTap Course List)
6th Edition
ISBN:9781305632134
Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Chapter3: Power Transformers
Section: Chapter Questions
Problem 3.56P: Three single-phase two-winding transformers, each rated 3kVA,220/110volts,60Hz, with a 0.10 per-unit...
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![A 15,000 KVA, 6.9 KV generator, star connected has positive, negative and zero
sequence reactances of 0.25, 0.25 and 0.08 p.u. respectively. A reactor of 0.06 p.u. reactance
on the generator rating is placed in the line from neutral to ground: A double line to ground
fault occurs at the terminals of the generator when it is operating at its rated voltage and
unloaded. Find the unitial r.m.s. line and ground wire current for a solidly grounded fault,
and also the voltage to ground of the unfaulted line.
(UPSC-1975)
Ans: 1-1,-4970 A; I, 5480 A; V. 69.7 KV](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F9e221d50-56f3-4ab7-a430-35d269ad39b3%2Fb0773696-efb3-4fa5-91fb-3b579d6bf727%2Fuqdn8vp_processed.jpeg&w=3840&q=75)
Transcribed Image Text:A 15,000 KVA, 6.9 KV generator, star connected has positive, negative and zero
sequence reactances of 0.25, 0.25 and 0.08 p.u. respectively. A reactor of 0.06 p.u. reactance
on the generator rating is placed in the line from neutral to ground: A double line to ground
fault occurs at the terminals of the generator when it is operating at its rated voltage and
unloaded. Find the unitial r.m.s. line and ground wire current for a solidly grounded fault,
and also the voltage to ground of the unfaulted line.
(UPSC-1975)
Ans: 1-1,-4970 A; I, 5480 A; V. 69.7 KV
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