Diagnostic testing of MV XLPE cables with low density of water trees

Conference Record of the the 2002 IEEE International Symposium on Electrical Insulation (Cat. No.02CH37316) Pub Date : 2002-04-07 DOI:10.1109/ELINSL.2002.995892

S. Hvidsten, J. T. Benjaminsen

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引用次数: 18

Abstract

In this paper, results from diagnostic measurements performed on service aged 12 and 24 kV (MV) XLPE cables equipped with strippable insulation screens are reported. The main purpose of this work has been to examine if condition assessment can be performed on such cables having typically low density of vented water trees. The actual condition of the cables was determined by laboratory AC breakdown tests and water tree examinations performed on the same cables. Secondly, the influence on the diagnostic testing of the joints installed on the cables has been examined. The results show that it is not possible to distinguish the ageing status for cables having breakdown voltages of 5 U. and higher. The evaluation criteria need to be further developed, in order to examine if the condition of cables with breakdown voltages lower than 5 U. can be reliably assessed. Joints with resistive field grading can have very high resistive losses preventing a reliable condition assessment of the cable insulation.

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低水树密度中压交联聚乙烯电缆的诊断试验

本文报告了对12和24 kV (MV) XLPE电缆进行诊断测量的结果，这些电缆配备了可剥离绝缘屏蔽。这项工作的主要目的是检查是否可以在具有典型的低密度喷水树的电缆上进行状态评估。电缆的实际状况由实验室交流击穿试验和对同一电缆进行的水树试验确定。其次，分析了安装在电缆上的接头对诊断试验的影响。结果表明，对于击穿电压在5u以上的电缆，无法区分其老化状态。为了检验击穿电压低于5 u的电缆是否能够可靠地评估其状态，需要进一步制定评估标准。具有电阻场等级的接头可能具有非常高的电阻损耗，从而无法对电缆绝缘进行可靠的状态评估。

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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Conference Record of the the 2002 IEEE International Symposium on Electrical Insulation (Cat. No.02CH37316)

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