Importance

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Abstract

A multiple element current sharing surge voltage protector is connected in parallel between a voltage source and the input of an electrical load. The protective network includes a low pass shunt capacitor filter, a first suppressor having a selenium varistor clamping device connected in parallel shunt relation with the low pass capacitor filter, and a second suppressor having a plurality of MOV varistor clamping devices connected in parallel shunt relation with the low pass capacitor filter and the selenium suppressor. The parallel connected MOV varistors remain substantially in a non-conducting, open circuit condition until the surge voltage exceeds the turn-on clamping voltage of the MOV suppressors. After turn-on of the MOV varistors, the total surge current flow is divided through the selenium varistor and the multiple MOV varistors, and the shunt capacitor. The devices and quantities of each are selected for the desired suppression V/I curve to achieve maximum clamping as close to the peak of the power sine wave at a broad range of currents without disturbing the input power waveform and without abrupt changes in the suppression curve.

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First Claim