重频纳秒高压脉冲下变压器油击穿特性的实验研究

介绍了重频纳秒高压脉冲下变压器油绝缘特性研究的现状和成果。进行了重频（1 Hz～1 kHz）纳秒高压脉冲下25#变压器油击穿特性的实验研究。实验发现相对于单次纳秒脉冲，重频脉冲下25#变压器油的击穿场强与频率相关，频率提高，击穿场强降低，但不是线性关系，在频率超过100 Hz时变压器油的击穿场强变化较小，在10~100 Hz时变压器油的击穿场强迅速下降。初步总结了重复频率、脉冲宽度和击穿场强的关系，对重频脉冲下变压器油的击穿机理进行了初步的探讨。

Study on transformer oil breakdown under repetitive nanosecond pulses

In this paper, the results of repetitive nanosecond breakdown in transformer oil are introduced. The breakdown characteristics of 25~# transformer oil under repetitive nanosecond pulses ranged from 1 Hz to 1 000 Hz and the gap distances range from 0.3~1.5 mm have been investigated. The breakdown waveforms of voltage, current and breakdown time have been measured. The results indicate that ns level high voltage pulse breakdown field is much higher than breakdown in DC and AC. The breakdown field value decreases with the repetitive rate increases. From 10 Hz to 100 Hz, the breakdown field falls quickly. When repetitive rates exceed 100 Hz, the field value fall down speed is slow. The experimental results show that the lowering of the breakdown elactric field under repetitive pulses conditions is likely due to the “accumulation effect”.