Protective device for temporary system overvoltages

H - Electricity – 02 – H

Patent

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323/6

H02H 9/04 (2006.01)

Patent

CA 2040163

ABSTRACT An apparatus and method for a power overvoltage protection system for limiting sudden transition line overvoltages. the apparatus and method include a voltage divider having a first varistor block and a second varistor block electrically connected in series. The first block and the second block each having a plurality of varistors. The first block exists in a non conductive mode during normal operation of the power system. A thyristor circuit having a voltage sensor and a pair of oppositely coupled thyristors, is electrically connected between the first and second blocks and ground. The voltage sensor continuously senses line voltage Vo, and a trigger mechanism continu- ously compares the sensed voltage Vo with a predetermined critical voltage of magnitude Vp to form a ratio. When the voltage Vo exceeds a predetermined threshold value of approximately 1.1 or 1.2 PU, the thyristor is activated into a conductive mode so that the line voltage Vo is entirely absorbed by the first block of the remaining voltage Vo through the oppositely coupled thyristor pair to ground. The thyristor is reset into non-conductive mode when the Vo/Vp ratio falls below the predetermined value. A-43490/AJT/JAS June 15, 1990

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