基于极化去极化电流法的冲击电容器油膜绝缘老化检测

Aging Detection of Oil Film Insulation for Surge Capacitor Based on Polarization － depolarization Current Method

摘要:

利用极化去极化电流法( PDC) 对冲击电容器油膜绝缘老化状态进行检测。介绍了该方法的理论依据，搭建了 极化去极化电流测试平台，对未老化油膜以及不同老化程度的油膜进行了极化去极化电流的测试，得到了对应的极 化去极化电流曲线、介质损耗以及直流电导率，分析了极化去极化电流曲线产生差异的原因。试验结果表明，通过对 冲击电容器油膜的极化去极化电流进行分析，可以合理检测油膜的老化状态。

Abstract:

The polarization － depolarization current ( PDC) method is used to detect the aging state of oil film insulation of surge capacitor． The theoretical basis of the proposed method is introduced，and the testing platform for polarization － depolarization current is built． Polarization － depolarization current of the unaged oil film and the oil film with different degree of aging are measured． The corresponding polarization － depolarization current curve，dielectric loss and DC conductivity are obtained． The causes for the difference in polarization － depolarization current curves are analyzed． The experimental results show that the aging state of oil film can be reasonably detected by analyzing the polarization － depolarization current of oil film of surge capacitor．