本文選題：直流電纜 + 雷電沖擊試驗(yàn)��； 參考：《高電壓技術(shù)》2015年08期

【摘要】：針對(duì)直流電纜雷電沖擊試驗(yàn)中電壓測(cè)量波形存在異常抖動(dòng)、不符合標(biāo)準(zhǔn)的問題,對(duì)沖擊電壓發(fā)生器先接分壓器,后接試品接線方式(記為方式Ⅰ)的沖擊試驗(yàn)放電回路進(jìn)行了理論分析,并在Pspice環(huán)境下進(jìn)行仿真,觀察電容分壓器兩端的測(cè)量波形與試品兩端的實(shí)際波形之間的差異。分析認(rèn)為,電容分壓器與電纜試品之間存在的引線電感導(dǎo)致測(cè)量波形與試品實(shí)際波形有一定的偏差,當(dāng)引線電感過大時(shí)甚至?xí)l(fā)生異常抖動(dòng)。為此,提出了先接試品,后接分壓器的接線方式(記為方式Ⅱ)。在不同的引線電感下,比較了2種接線方式下測(cè)量波形和實(shí)際波形的一致度以及時(shí)間參數(shù)(波前時(shí)間、半峰值時(shí)間)的測(cè)量誤差以驗(yàn)證方式Ⅱ的合理性。研究結(jié)果表明:采用方式Ⅰ,隨著引線電感的增大,測(cè)量波形的異常抖動(dòng)幅度增大,且與實(shí)際波形的偏差愈來愈大,時(shí)間參數(shù)的測(cè)量誤差也隨之增加;而采用方式Ⅱ,即使引線電感較大,測(cè)量波形也不會(huì)出現(xiàn)異常抖動(dòng),能較好地逼近實(shí)際波形,同時(shí)測(cè)量誤差被限制在較小值。采用方式Ⅱ?qū)﹄娎|試品進(jìn)行了現(xiàn)場(chǎng)雷電沖擊試驗(yàn),結(jié)果表明試驗(yàn)波形的異常抖動(dòng)消失,與仿真結(jié)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，

本文編號(hào)：2088418