风力发电组合式变压器用高压限流熔断器爆熔故障的原因分析  

Analysis of explosive melting fault of high voltage current-limiting fuse of pad-mounted transformer for wind turbine applications

作　　者：袁乙专 张晓峰 毛启武 张伟涛 钟志锦 Yuan Yizhuan;Zhang Xiaofeng;Mao Qiwu;Zhang Weitao;Zhong Zhijin(Pearl Electric Co.,Ltd,Guangzhou 511400)

机构地区：[1]明珠电气股份有限公司,广州511400

出　　处：《电气技术》2018年第8期63-67,71,共6页Electrical Engineering

摘　　要：高压限流熔断器发生爆熔等故障,是影响组合式变压器安全运行的主要威胁之一。针对风力发电组合式变压器用高压限流熔断器爆熔问题,分析故障的主要原因在于:设计选型时未满足熔断器降容要求、引线铜片处渗油、长时间热量累积造成绝缘加速老化。经额定电流为31.5A的熔断器温升试验表明,高压限流熔断器内部温度比外部油温高出25K是可能的,即外部油温在75℃或以上时,圆干筒内的温度将达到100℃。本文提出设计时应根据熔断器实际安装位置合理降容,并以1600k VA组合式变压器为例,给出了设计选型改进实例。文中的研究对高压限流熔断器的应用具有重要的参考意义。One of the major threats to safe operation of the pad-mounted transformer is the failure of high voltage current-limiting fuse such as explosion melting.In view of explosive melting problem of high voltage current-limiting fuse of pad-mounted transformer for wind turbine applications,the main failure cause is analyzed.One reason is that the design and selection did not meet the requirements for reducing fuse capacity.The second reason is oil seeping at copper sheet of lead wire.The third reason is that heat accumulation for a long time causes accelerated aging of insulation.The temperature rise test of the fuse with rated current of 31.5A indicates that it is possible that the internal temperature of the high voltage current-limiting fuse is 25K higher than the external oil temperature.That is,when the external oil temperature is at or above 75℃,the temperature in the dry cylinder will reach 100℃.It is suggested that the design should be reasonably reduced capacity according to the actual installation of high voltage current-limiting fuse.Taking 1600kVA pad-mounted transformer as an example,the improvement example of design and selection is presented.The study of this paper has important reference significance for the application of high voltage current-limiting fuse.

关 键 词：高压限流熔断器 爆熔 组合式变压器 故障 

分 类 号：TM563.1[电气工程—电器]