Question
Download Solution PDFWhat is the purpose of a lighting arrester connected between the line and earth in a power S/M?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFLightning arresters or surge diverters:
- A lightning arrester or a surge diverter is a protective device which conducts the high voltage surges on the power system to the ground
- It consists of a spark gap in series with a non-linear resistor
- The length of the gap is so set that normal line voltage is not enough to cause an arc across the gap, but a dangerously high voltage will break down the air insulation and form an arc
- The property of the non-linear resistance is that its resistance decreases as the voltage (or current) increases and vice-versa
- One end of the diverter is connected to the terminal of the equipment to be protected and the other end is effectively grounded
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