Example 11.24. Varley loop test is performed to locate an earth fault on a 20 km long cable. The resistance per km of the single conductor is 20 2. The loop is completed with a similar healthy conductor. At balance, the variable resistance connected to the faulty conductor is 200 2. The fixed resistors have equal values. Calcualte the distance of the fault from the test end.

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
Chapter10: System Protection
Section: Chapter Questions
Problem 10.16P
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Example 11.24. Varley loop test is performed to locate an earth fault on a 20 km long cable.
The resistance per km of the single conductor is 20 2. The loop is completed with a similar healthy
conductor. At balance, the variable resistance connected to the faulty conductor is 200 2. The fixed
resistors have equal values. Calcualte the distance of the fault from the test end.
Transcribed Image Text:Example 11.24. Varley loop test is performed to locate an earth fault on a 20 km long cable. The resistance per km of the single conductor is 20 2. The loop is completed with a similar healthy conductor. At balance, the variable resistance connected to the faulty conductor is 200 2. The fixed resistors have equal values. Calcualte the distance of the fault from the test end.
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