BI-DIRECTIONAL SURGE PROTECTION SYSTEM FOR POWER LINE

摘要

PURPOSE: A bi-directional surge protection system for power line is provided to suppress the surge entering from both directions of the power line by attenuating RF interference components of the surge instantaneously input from both directions of the power line. CONSTITUTION: A system comprises first and second low pass filters(22,20) connected in serial between a power(11) and a load(12); the first varistor terminal(14) arranged at the front end of the first low pass filter and which has a varistor connected in parallel between the power line and ground; the second varistor terminal(18) arranged at the rear end of the second low pass filter and which has a varistor connected in parallel between the power line and ground; and the third varistor terminal(16) arranged between first and second low pass filters and which has a varistor connected in parallel between the power line and ground.