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why the present day surge diverters use non-linear resistance elements

Question asked by aarthivg in #Coffee Room on May 14, 2012
aarthivg · May 14, 2012
Rank B1 - LEADER
why the present day surge diverters use non-linear resistance elements? Posted in: #Coffee Room
Anuj Aggarwal
Anuj Aggarwal · May 14, 2012
Rank D3 - MASTER
Non linear resistor has the property to block the current upto a certain level to which it is set i.e. it will block the current from passing through upto a preset value and allows the current to pass through it when current exceeds( as in case of lightning surge ) , thus grounding the lightning surge and hence prevents that large current from reaching the equipment which is to be protected.
westom · May 15, 2012
Best protection for cable TV is a wire from that cable to earth ground. Other incoming utilities (ie telephone, AC electric) cannot make that same low impedance connection. So a protector makes that connection. Non-linear means each wire remains unconnected in normal operation. And connected low impedance to earth during a transient. Cable has better protection. But non-linear resistors are required so that telephone and AC electric service is not shorted out by the earth ground connection.

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