| 引用本文: | 陈昊,沙浩源,钱其隆,任旭超,刘怀宇,徐伟伦.低通道依赖的变电站动力电缆漏电流监测方法[J].电力自动化设备,2023,43(1): |
| CHEN Hao,SHA Haoyuan,QIAN Qilong,REN Xuchao,LIU Huaiyu,XU Weilun.Leakage current monitoring method of power cable in substation with low channel dependence[J].Electric Power Automation Equipment,2023,43(1): |
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| 摘要: |
| 为缓解变电站动力电缆漏电状态判断算法对理想通信条件的高度依赖，提出了一种低通道依赖的变电站动力电缆漏电流监测方法。首先，在监测信号同步计算中对传统的参考相量法进行改进，以电源侧为相位差计算的参考基准，消除了负荷波动对信号同步计算的影响。然后，提出基于电流差动原理的复合漏电流判据，以解决系统在未采集到对比基准时的电缆漏电状态判断问题。同时，针对变电站实际运行中漏电流监测系统可能出现的非理想通信情况，建立了与之相匹配的不同漏电判断模式及相应的判断方法，实现了在信息不全的情况下动力电缆漏电状态的正常监测。最后，通过仿真及江苏某500 kV变电站实际数据对所提方法的有效性与优越性进行验证。结果表明，该方法能够在不同通信条件下灵活切换漏电判断模式，显著提高了对漏电状态判断的准确性与可靠性。 |
| 关键词: 动力电缆 改进参考相量同步法 复合漏电流判据 判断模式 漏电流监测 智能运检 |
| DOI：10.16081/j.epae.202206016 |
| 分类号:TM247 |
| 基金项目:国家重点研发计划项目(2018YFB1500800) |
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| Leakage current monitoring method of power cable in substation with low channel dependence |
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CHEN Hao1, SHA Haoyuan1, QIAN Qilong2, REN Xuchao1, LIU Huaiyu1, XU Weilun2
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1.State Grid Jiangsu Electric Power Co.,Ltd. EHV Branch Company, Nanjing 211102, China;2.State Grid Jiangsu Electric Power Co.,Ltd. Nanjing Power Supply Branch Company, Nanjing 210019, China
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| Abstract: |
| In order to alleviate the high dependence of the power cable leakage state judgment algorithm in substation on ideal communication conditions, a leakage current monitoring method of power cable in substation with low channel dependence is proposed. Firstly, the traditional reference vector method is improved in the monitoring signal synchronization calculation, and the power supply side is used as the reference for the phase difference calculation, which eliminates the influence of the volatility on the synchronization calculation. Then, a composite leakage current criterion based on the principle of current differential is proposed to solve the problem of judging the cable leakage state when the system does not collect the comparison reference. At the same time, according to the non-ideal communication situation that may occur in the leakage current monitoring system of the substation in operation, different leakage judgment modes and corresponding judgment methods are established to match them. The normal monitoring of the leakage state of the power cable is realized under the condition of incomplete information. Finally, the effectiveness and superiority of the proposed method are verified by simulation and actual data of a 500 kV substation in Jiangsu grid. The results show that the algorithm can flexibly switch the leakage judgment modes under different communication conditions, which significantly improves the accuracy and reliability of the leakage state judgment. |
| Key words: power cable refined synchronization method based on reference vector composite leakage current criterion judgment mode leakage current monitoring intelligent maintenance |
