电力电缆VLF Tanδ老化诊断标准的统计分析

Journal of The Korean Institute of Electrical and Electronic Material Engineers Pub Date : 2020-01-01 DOI:10.4313/JKEM.2020.33.1.1

Woosung Jung, Seong Min Kim, Lim, Jangseob, Jin Lee

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引用次数: 0

摘要

在本研究中，目的是改进用于根据地下配电电缆水树退化对VLF tanδ (TD)数据库和故障率进行统计比较的标准。利用威布尔分布将韩电准则的老化条件划分为6个等级，并利用韩电获得的VLF大数据组寿命参数的统计终点对“即将失效”条件进行量化。此外，还提出了TD、DTD和统计归一化因子的二维组合准则。这些标准对即将发生故障的电缆的检测具有很高的再现性。因此，与韩电的VLF-2012标准相比，如果采用延长版的VLF-2019标准，更换电缆的资产管理费用将有所减少。

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A Statistical Analysis to the VLF Tanδ Criteria for Aging Diagnosis in Power Cables

In this study, the objective is to improve the criteria used for statistical comparison of the VLF tanδ (TD) database and failure rate according to water-tree degradation in underground distribution power cables. The aging condition of the KEPCO criteria is divided into 6 levels using the Weibull distribution, and the “failure imminent” condition is quantified by using the statistical end-point of the lifetime parameter of the VLF big-data group obtained from KEPCO. Moreover, new criteria with a 2-dimensional combination of TD, DTD, and a statistical normalized factor are suggested. These criteria exhibit high reproducibility for the detection of cables in an imminent failure state. Consequently, it is expected that the adoption of the extended VLF-2019 criteria will reduce the asset management cost of cable replacement compared to the VLF-2012 criteria of KEPCO.

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Journal of The Korean Institute of Electrical and Electronic Material Engineers

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