场强的提高对局部放电测试的影响

局部放电 (PD)是检测 XL PE电缆缺陷的一种重要手段 ,缺陷会造成电缆的局部场强的不均匀 ,在施加外部电压后引起局部放电的现象。本文提出 :在 XL PE电缆承受耐压的过程中 ,采用提高场强的方法 ,能更有效地发现 PD缺陷 ,从而降低 XL PE电缆在运行中的击穿事故。

Affection of increase in field-strength on PD measurement

PD measurement is an important means to detect defects on XLPE cables. Defects on cable insulation will cause inhomogeneity of field strength, which gives rise to partial discharge (PD) when an outside voltage is applied. This article indicates that by increasing the field strength of the cable under voltages, PD site may be effectively detected, which helps lowering breakdown accidents of XLPE cables in operation.