A. When any feeder is coming there may be chance of occurring of surge voltage due to direct or indirect lightning or may be due to switching effects. So in order to save our equipment's connected to line from surge either we have to divert the surge to ground or absorb to decrease its effect. When the surge occurs surge arrester acts as short circuit and when surge is totally diverted then it acts as open circuit. The NON -LINEAR RESISTERS like METROSIL will be used in these devices.
Q. What is non linear resister?
A. Normal resister is which has liner characteristics for ohms law, means which will flow low currents for low voltages and high currents for high voltages. But nonlinear resister offers high resistance for low voltage and low resistance for high voltage.
Q. What is meant by SURGE?
A. A large amount of voltage is applied at very small time. Only small time has its effect on system.
The following are snaps of broken LA at field...
name plate of LA at field
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