电流互感器断线情况下的接地距离保护改进方案

发布时间：2018-02-24 09:04

本文关键词： 继电保护 TA断线接地距离保护超越动作拒动接地　出处：《电力自动化设备》2014年12期 　论文类型：期刊论文

【摘要】：由于对供电可靠性的要求越来越高,有必要研究在电流互感器(TA)断线情况下发生故障时,距离保护的动作行为。基于保护安装处测得的故障回路电阻,分析了TA断线对接地距离保护的影响。由分析可知,接地距离保护受潮流方向和故障相别影响:在电源侧,当相位超前于断线相的相别发生区内故障时,接地距离保护容易拒动,当相位滞后于断线相的相别发生区外故障时,接地距离保护容易误动;而负荷侧的接地距离保护动作情况与电源侧相反。结合TA断线识别方法提出了自适应接地距离保护方案,并对方案进行了理论分析和试验验证;针对TA回路和保护配置给出了改进建议。
[Abstract]:Because of the higher and higher demand for the reliability of power supply, it is necessary to study the action behavior of distance protection when the current transformer is broken. Based on the fault circuit resistance measured at the protection installation, it is necessary to study the action behavior of the distance protection when the current transformer is broken. The influence of TA breakage on grounding distance protection is analyzed. From the analysis, it can be seen that the grounding distance protection is affected by the direction of power flow and the fault phase. On the power side, when the phase is ahead of the broken phase, the fault occurs in the area where the phase is ahead of the broken phase. The earthing distance protection is easy to refuse operation, when the phase lag behind the broken phase, the fault occurs outside the area, the ground distance protection is easy to misoperate. On the other hand, the operation of earthing distance protection on load side is contrary to that of power side. Combined with TA breaking line identification method, an adaptive earthing distance protection scheme is put forward, and the scheme is theoretically analyzed and tested. Suggestions for improvement of TA loop and protection configuration are given.
【作者单位】：国电南京自动化股份有限公司;
【分类号】：TM773

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