FAULT PRESSURE RELAY FOR POWER TRANSFORMER

摘要

A fault pressure relay for a power transformer is provided to allow a field worker or manger to recognize a fault pressure detection state by including an LED(Light Emitting Diode) display. A sensing bellows senses a pressure change of insulating oil inside a power transformer(1). A manifold(130) transmits pressure by distributing silicon working fluid pressed by the sensing bellows to an actuator bellows(151) and a control bellows(152). An actuator operates a micro switch(170) by operation of the actuator bellows and the control bellows to detect fault pressure. A needle valve(200) is installed on a path from the manifold to the control bellows to function as a flow control unit for restricting a flow rate of the silicon working fluid.