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A VarleyBridge is connected to a faulty three-core copper cable by two identical copper leads of resistance Rl.


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

                        2Rx = 2RcRi

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


 (c) Determine the distance to the fault by modifying the expression in (b) and using  

(d) Using  

(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 .



  • 5 years ago
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