为了研究变压器油中针板间隙的冲击击穿特性,搭建了冲击电压变压器油间隙击穿试验平台,对油中针板间隙进行包括标准雷电、标准操作等5种波形参数的冲击击穿试验.结果表明:冲击电压的波形参数对间隙的击穿时间有显著的影响,击穿时间随着波前时间的增加而增加.电极曲率半径会影响间隙的流注起始电压和击穿电压以及对应的间隙最大场强.间隙距离除了影响间隙击穿电压外,还对流注起始最大场强和间隙击穿最大场强产生影响.在施加电压幅值范围内,击穿过程中观测到的流注发展平均速度比较稳定,冲击电压波前时间、电极曲率半径和间隙距离未对流注发展平均速度产生影响.
In order to study the impulse breakdown characteristics of needle plate gap in transformer oil,an impulse voltage test platform was set up.Then breakdown tests were carried out for the needle plate gap in oil under standard lightning and standard switching impulse voltages with five waveform parameters.The results show that the waveform parameters of impulse voltage have obvious effect on the breakdown time,and the breakdown time increases with the increase of wave front time.The curvature radius of electrode affects the streamer initiation voltage and breakdown voltage as well as the corresponding maximum field strength.Except affects the breakdown voltage,the gap distance also affects the streamer initiation and breakdown maximum field strength.The average velocity of streamer is stable in the breakdown tests,and the wave front time,electrode curvature radius,and gap distance have no effect on the average velocity of streamer.
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