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Determine the distance to the fault

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Reference no: EM13902168

A Varley Bridge is connected to a faulty three-core copper cable by two identical copper leads of resistance R1.

(a) Show that for the initial reading (connection to earth);

                                                2Rx = 2Rc - Ri      

(b) By multiplying the rhs brackets and collecting terms, show the effect of the leads is given by:

Rx = (Rf-Ri/Rf) Rc-(RiRi/Rf)

(c) Determine the distance to the fault by modifying the expression in (b) and using Rx/Rc = x/L 

(d) Using  R = ΡL/A

(e) Determine the distance to a fault on a 200 m, 120 mm2 copper cable if copper 10 mm2 test leads of length 10 m are used and Ri/Rf = 0.2.

Reference no: EM13902168

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