Investigation on Online Fault Location Techniques During Factory Testing on Manufactured Cable Lengths

N. Guerrini, G. Mazzanti, B. Diban, I. Troia
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Abstract

The operational constraints for the supply and exercise of HV extruded cable systems requires a fast and reliable localization of possible faults in cable insulation. Methods are available in the literature for offline fault location for both underground and (long) submarine cables installed in the field. The main method used is Time Domain Reflectometry (TDR), which works well when the fault impedance is low, but other methods are also available for relatively high fault impedances. However, such methods require a subsequent fault pin-pointing that works well offline and in the field. On the other side, there is the need of an effective and extremely-accurate localization method that can be applied on factory tests as well as on site. The purpose of this work is to get insights on such effective online fault localization technique in factory-tested cables, based on the analysis of the fault curve and on its comparison to different offline fault localization methods.
成品电缆长度出厂测试在线故障定位技术研究
高压挤压电缆系统的供应和运行限制要求对电缆绝缘中可能出现的故障进行快速可靠的定位。文献中提供了离线故障定位方法,用于安装在现场的地下和(长)海底电缆。常用的主要方法是时域反射法(TDR),该方法在故障阻抗较低时效果良好,但在故障阻抗较高时也可采用其他方法。然而,这种方法需要后续的故障定位,这种定位在离线和现场都能很好地工作。另一方面,需要一种既适用于工厂测试也适用于现场测试的有效且极其精确的定位方法。本工作的目的是通过对故障曲线的分析,并将其与不同的离线故障定位方法进行比较,了解这种有效的在线故障定位技术在工厂测试电缆中的应用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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