Using the Murray Loop test, determine the distance to an earth fault on one of the cores of a… 1 answer below »

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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 = 2.5 ohms, Rb = 2.5 ohms and the cable length is 40 m. b) If the cable measurement is accurate to ±1% what length of excavation would be required to locate the fault? i) A ring main (FIGURE 1) consists of 10 km of 120 mm2 three-core cable from the Service Mains jointed to 5 km of 300 mm2 cable from the Distribution Substation. The potentiometer ratio from a Murray Loop test performed at the Substation is 1/6. Draw and label a diagram of the cable between the Sub Station and the Service Mains ii) For an earth on one core of the cables, determine the location of the fault.

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