不同接线方式下直流电缆雷电冲击试验研究

发布时间：2018-07-01 16:46

  本文选题：直流电缆 + 雷电冲击试验　； 参考：《高电压技术》2015年08期

【摘要】：针对直流电缆雷电冲击试验中电压测量波形存在异常抖动、不符合标准的问题,对冲击电压发生器先接分压器,后接试品接线方式(记为方式Ⅰ)的冲击试验放电回路进行了理论分析,并在Pspice环境下进行仿真,观察电容分压器两端的测量波形与试品两端的实际波形之间的差异。分析认为,电容分压器与电缆试品之间存在的引线电感导致测量波形与试品实际波形有一定的偏差,当引线电感过大时甚至会发生异常抖动。为此,提出了先接试品,后接分压器的接线方式(记为方式Ⅱ)。在不同的引线电感下,比较了2种接线方式下测量波形和实际波形的一致度以及时间参数(波前时间、半峰值时间)的测量误差以验证方式Ⅱ的合理性。研究结果表明:采用方式Ⅰ,随着引线电感的增大,测量波形的异常抖动幅度增大,且与实际波形的偏差愈来愈大,时间参数的测量误差也随之增加;而采用方式Ⅱ,即使引线电感较大,测量波形也不会出现异常抖动,能较好地逼近实际波形,同时测量误差被限制在较小值。采用方式Ⅱ对电缆试品进行了现场雷电冲击试验,结果表明试验波形的异常抖动消失,与仿真结果一致。
[Abstract]:Aiming at the problem of abnormal jitter in voltage measurement waveform in lightning impulse test of DC cable, the voltage divider is connected to impulse voltage generator first. The impact test discharge circuit of the connection mode (described as mode I) is theoretically analyzed and simulated under PSpice to observe the difference between the measured waveforms at the two ends of the capacitor divider and the actual waveforms at the two ends of the test. The analysis shows that the lead inductance between the capacitor divider and the cable sample leads to a certain deviation between the measured waveform and the actual waveform of the sample. When the lead inductance is too large an abnormal jitter will even occur. For this reason, the connection mode of connecting the test sample first and then the divider is put forward (mode 鈪，

本文编号：2088418