Question
Download Solution PDFMurray loop test is conducted on a 500 m underground cable for locating ground fault by looping it with a sound cable of the same length and cross-section. If the ratio of other arms of the testing system is 4 : 1, then at what distance is the fault located from the testing end of the cable?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept
The problem involves the Murray loop test, which is used to locate a ground fault in an underground cable.
The distance of the fault from the testing end is given by:
\(d= {L \over 1+{R_2\over R_1}}\)
where, d = Distance
L = Total cable length
Calculation
Given, L = 500 m
Ratio of other arms in the testing system = 4:1
\({R_2\over R_1}=4\)
\(d= {500\over 1+4}\)
d = 100 m
So, d = 100 m from the test end.
However, in the Murray loop test, the fault location is measured along one side of the looped cable, meaning the fault is actually at 2 × 100 = 200 m from the test end.
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