A study on analysis of defects for hydro generator power transmission cables using VLF testing and diagnostic measurements

2014 IEEE International Conference on Industrial Technology (ICIT) Pub Date : 2014-09-11 DOI:10.1109/ICIT.2014.6894957

Jeong-Ho Chang, Heung-Ho Lee, In-soo Kim

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引用次数: 3

Abstract

For decades DC (Direct Current) has been used to assess the condition of medium and high voltage power cables. There are several advantages using this DC test due to its low weight, portability, usability, and being cost-effective. Meanwhile, this DC method has its limitations including possible destructive consequences [1]. It has caused cable failures due to `charges' trapped in the insulation. This induced local field stress when AC power reenergized and accelerated the growth of water-trees. Therefore, recently the Very Low Frequency (VLF) test has been recommended to use as an installation test of XLPE insulated cables according to IEEE standards. In this paper the VLF cable test will be studied in detail for testing XLPE power cables using the Tan δ and Partial Discharge measurements. The focus is to detect any existing fault, defects, or irregularities at the inspection of the cables before any breakdowns occur. The test data on service aged XLPE cables used in hydro power generators will be analyzed.

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水轮发电机输电电缆缺陷的VLF检测与诊断方法研究

几十年来，直流(Direct Current)一直被用来评估中高压电力电缆的状态。由于其重量轻、便携、可用性和成本效益高，使用这种直流测试有几个优点。同时，这种直流电法也有其局限性，可能造成破坏性后果[1]。由于“电荷”被困在绝缘中，它导致电缆故障。当交流电源重新通电并加速水树生长时，会引起局部电场应力。因此，最近根据IEEE标准，推荐使用甚低频(VLF)测试作为交联聚乙烯绝缘电缆的安装测试。本文将详细研究利用Tan δ和局部放电测量来测试XLPE电力电缆的VLF电缆测试。检查的重点是在电缆发生故障之前，及时发现电缆存在的故障、缺陷或不规范现象。对水轮发电机用交联聚乙烯电缆的使用老化试验数据进行了分析。

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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2014 IEEE International Conference on Industrial Technology (ICIT)

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