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首页> 外文会议>Conseil International des Grands Reseaux Electriques;International Council on Large Electric Systems;CIGRE session >Development and Application of Compact Type On-line PD System at on-site for detecting PD by applying AC withstand voltage in underground power cable
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Development and Application of Compact Type On-line PD System at on-site for detecting PD by applying AC withstand voltage in underground power cable

机译：地下电力电缆中施加交流耐压的紧凑型在线局部放电在线检测系统的开发与应用

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Extra high voltage underground power cable (UGC) is critical to establish backbone gridnetwork and its economical and social effect is strongly immense in case of faults. In thisregard, since more than three decades, Partial Discharge (PD) measurement has becomeaccepted as one of the effective method to diagnose. In order to carry out PD test forcommissioning test, recently, portable PD measurement has been introduced during applyingnominal voltage after completing AC withstand test. However, this conventional methodlacks reliability in terms of detecting irregularly and inadequately repeated PD signal; indeed,this method is not able to detect PD occurrence during AC withstand test owing to thesecurity problems. For this reason, the compact type PD monitoring system has beendeveloped to assure cable performance in case of applying initial voltage, and has beenintroduced on commissioning test for 345 kV underground cables in actual grid.In this study, this system shows several advantages comparing with the conventional one asfollows; higher possibility to detect PD signal comparing with conventional one by carryingout PD test during commissioning test: Applying AC withstand voltage for PD test, i.e.250kV in 1 hour for 345 kV UGC. Improvement of the reliability to increase accuracy toanalyze PD signal by introducing frequency analysis, pulse analysis and time differenceanalysis, simultaneouslyIn accordance with the statistical result, the failure rate of XLPE cable is over 50% within 1year after commissioning. Accordingly, it is able to provide the solution for reducing initialfailure and for analyzing fault parameter of XLPE cable by carrying out AC withstand testand PD test at the same time. Furthermore this compact type PD monitoring system is able toprovide cost reduction against installation cost of the conventional PD system. Directconnection between UGC monitoring system and this system is another advantage to monitorPD performance in actual grid.
机译：超高压地下电力电缆（UGC）对于建立骨干网至关重要 如果发生故障，网络及其经济和社会影响将非常巨大。在这个 自三十多年来以来，局部放电（PD）测量已成为 被公认为是诊断的有效方法之一。为了进行PD测试 调试测试，最近，在应用过程中引入了便携式PD测量 完成交流耐压测试后的标称电压。但是，这种常规方法 在检测不规则和不适当的重复PD信号方面缺乏可靠性;的确， 由于这种方法，在交流耐压测试期间无法检测到PD的发生 安全问题。因此，紧凑型PD监控系统已经成为 开发用于在施加初始电压的情况下确保电缆性能的技术，并且已经 介绍了实际电网中345 kV地下电缆的调试测试。 在这项研究中，该系统显示出与传统系统相比的一些优势： 跟随;与传统方式相比，携带PD信号检测PD信号的可能性更高 在调试测试期间退出PD测试：对PD测试施加交流耐压，即 对于345 kV UGC，在1小时内达到250 kV。提高可靠性以提高精度 通过引入频率分析，脉冲分析和时差来分析PD信号 同时分析 根据统计结果，交联聚乙烯电缆的故障率在1％以内超过50％ 调试后一年。因此，能够提供用于减少初始的解决方案。 交流耐压测试，分析交联聚乙烯电缆的故障并分析其故障参数 和PD同时进行测试。此外，这种紧凑型PD监控系统能够 与传统的PD系统的安装成本相比，可以降低成本。直接的 UGC监控系统与此系统之间的连接是监控的另一个优势 实际网格中的PD性能。

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