Assignment:
Question 1. (a) Using the Murray Loop test, determine the distance to an earth fault on one of the cores of a uniform three-core underground cable. Ra = 2 ohms, Rb = 1 ohm and the cable length is 300 m.
(b) If the cable measurement is accurate to ±1% what length of excavation would be required to locate the fault?
Question 2. A cable run consists of 100 m of 120 mm2 three-core cable jointed to 100 m of 240 mm2 cable. The ratio of the potentiometer resistances in a Murray Loop test, Rb/(Rb + Ra), is 1/3
For an earth on one core of the cables, determine the location of the fault.
Provide complete and step by step solution for the question and show calculations and use formulas.