500kV油浸倒立式电流互感器故障实例及分析

Failure Example and Analysis on 500kV Oil-immersed Inverted Current Transformer

油浸倒立式电流互感器较传统正立式电流互感器相比有诸多优点,在500kV电网中大批量使用。但实际设备运行事故却时有发生,且绝缘事故占有较大比例。本文从倒立式电流互感器绝缘设计的3个关键部位出发,分析倒立式电流互感器的绝缘结构,并举出3起相应的故障实例。对倒立式电流互感器在使用中出现问题的原因进行分析,并从产品优化设计、工艺管控、设备运维等方面给出建议。

The oil-immersed inverted current transformer possesses many advantages compared to the tradi-tional upright current transformer and has a large-scale application in the 500kV power system.But acci-dents have occurred in the actual operation and a large proportion of them are insulation accidents.Starting from the three key parts of the insulation design of the inverted current transformer,this paper analyzes the insulation structure of the inverted current transformer and gives three examples of the corresponding faults.The reason of the problems in the use of inverted current transformer is analyzed and suggestion from the point of product optimization design,process control and equipment operation and maintenance is given.