Author(s): Liao Chunqiong, Li Hanshuang, YaoYonghong
Pages: 163-164
Year: 2015 Issue:  9
Journal: Electronic Test
Keyword:  transformer; pressure release; tripping signal;
Abstract: Transformer pressure release protection,as the transformer of non electric quantity protection, the protection principle is when fuel fault,the tank body pressure release valve of the micro switch action connected to the transformer tripping circuit to realize the protection of transformer.That when a fault occurs in the transformer,transformer oil is vaporized to produce large amounts of gas,also due to the rapid expansion of the volume of oil in the oil tank of the transformer,the transformer oil tank internal pressure is rising rapidly.When the transformer oil tank internal pressure rises to transformer pressure release valve set pressure,the transformer pressure release valve fretting switch quickly closed,also transformer pressure release valve in 2 milliseconds immediately opened,the transformer oil tank pressure drops sharply.At the same time the transformer pressure release valve fretting action quickly closed switch,transformer tripping outlet loop is switched on,all sides of the transformer circuit breaker is tripped.In order to prevent the further expansion of the transformer fault.But in the actualoperation, fre quent transformer pressure protection misoperation accident.This paper proceeds from the reality of field operation of transformer pressure release protecting make some comparative analysis,provide guidance for field operation.