A pre-selection valve control circuit for an ultra-high voltage converter station oil draining system

Abstract

The utility model relates to the electric control system technical field of the fire fighting and environmental protection facilities of extra -high voltage converter station, concretely is a kind of extra -high voltage converter station accident oil discharge system front selection valve control circuit.The control circuit includes double power switching module, miniature circuit breaker, far / local switching switch, manual button, high -power relay, intermediate relay and a variety of control contact point.Valve A and valve B's linkage control are realized by relay logic, have local, remote, fire linkage and liquid level interlock multiple control mode, cancel programmable logic controller (PLC), simple structure, strong anti -interference ability, low in cost, high reliability, it is applicable to the strong electromagnetic interference environment of extra -high voltage converter station.The utility model effectively promoted the response speed and operating reliability of accident oil discharge system, with good practicality and popularization value.

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