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

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Abstract 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.

Key words： high voltage current-limiting fuse explosive melting pad-mounted transformer fault

Received: 17 May 2018 Published: 31 August 2018

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	Articles by authors
	Yuan Yizhuan
	Zhang Xiaofeng
	Mao Qiwu
	Zhang Weitao
	Zhong Zhijin

Cite this article:

Yuan Yizhuan,Zhang Xiaofeng,Mao Qiwu等. Analysis of explosive melting fault of high voltage current-limiting fuse of pad-mounted transformer for wind turbine applications[J]. Electrical Engineering, 2018, 19(8): 63-67.

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http://dqjs.cesmedia.cn/EN/Y2018/V19/I8/63

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