摘要
在断路器无油化改造后的现场试验中发现一起35kVSF6断路器防跳动作不正确事故。经分析该断路器二次接线图,并现场试验,发现为断路器防跳回路中存在异常,防跳继电器接在储能触点后面,造成防跳继电器在断路器储能阶段无法正常起动并自保持,从而使防跳保护失去了应有的保护作用。提出并实现了该断路器防跳回路改造方案,改造后进行了多项防跳试验,证明防跳保护动作正确可靠,消除了事故隐患。
An incorrect action of anti-jumping protection of 35 kV SF6 breaker was founded on field tests after the oil-free reform of breakers.A nalysis of the breaker secondary circuit diagrams and field experiments were carried out and an abnormal phenomenon was founded in the breaker anti-jumping circuit that the anti-jumping relay was connectted after the energy storage contact.The anti-jumping protection lost its function because the anti-jumping relay could not start and self-hold in the energy storage process of breaker.A reform scheme of the breaker anti-jumping circuit was put forward and implemented.After the reform,some experiments proved the correct reaction of the anti-jumping protection and the hidden cause of accidents was eliminated.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2010年第12期138-140,共3页
Power System Protection and Control
关键词
断路器
防跳
二次回路
接线
防跳继电器
circuit breaker
anti-jumping
secondary circuit
relay wiring
anti-jumping relay
