Experimental study on breakdown characteristics of polymethylmethacrylate under fast pulse
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摘要: 基于CKP1000脉冲源建立了实验平台，实验获得了单次脉冲、不同脉宽、均匀电场下有机玻璃的击穿场强和击穿时延，对有机玻璃的击穿过程进行了分析。实验脉冲的幅值约为230 kV，前沿760~960 ps，脉宽2.3~4.0 ns（FWHM），试样的平均厚度为1.1 mm。实验结果表明，随着脉冲宽度从2.3 ns增加至4.0 ns，有机玻璃的平均击穿场强从301 kV/mm降至276 kV/mm，平均击穿时延则基本保持不变，其中前沿760 ps，脉宽约2.3 ns时对应击穿时延的分散性增大。Abstract: A single pulse breakdown experiment was performed on polymethylmethacrylate(PMMA) using a uniform field geometry, and the breakdown strength and breakdown time delay were obtained. The applied pulse amplitude was about 230 kV, rise time 760-960 ps, pulse width 2.3-4.0 ns(FWHM), and the specimen mean thickness was 1.1 mm. The experimental result shows that as the pulse width increases from 2.3 ns to 4.0 ns，the average breakdown strength of PMMA reduces from 301 kV/mm to 276 kV/mm, the average breakdown time delay approximately has a fixed value, but the standard deviation rises under the pulse with rise time 760 ps, pulse width 2.3 ns. Finally, based on the breakdown phenomena observed by stereomicroscope, the breakdown process was analyzed.
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Key words:
- polymethylmethacrylate /
- pulse breakdown /
- breakdown strength /
- breakdown time delay
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