Analysis of the influence to fault detecting of DC system from distributed capacitance
Analysis of the influence to fault detecting of DC system from distributed capacitance
复制标题
DOI：
10.1109/cyber.2015.7288223
复制
发表时间：
2015-06
期刊：
影响因子：
--
通讯作者：
Dong Zhiyun;Lei Xing;L. Gaoyuan;Ding Hongnin;Xu Zhaode
中科院分区：
文献类型：
--
作者：
Dong Zhiyun;Lei Xing;L. Gaoyuan;Ding Hongnin;Xu Zhaode
注入信号是直流系统中最常用的故障检测方法。但由于变电站中分布电容的存在，往往会误判故障。本文考虑了特高压变电站二次电缆的敷设，采用了对地二次电缆的典型电容值和电阻值。分析了当注入信号为低频方波时，分布电容对故障检测的影响。在此基础上，提出了基于注入信号的积分方法，该方法可以区分故障分支和非故障分支。进一步讨论了时间常数和注入信号频率的影响。
Inject signal is the most popular method used for fault detecting in the DC system. However, it usually misjudges faults due to the existence of distributed capacitance in substations. In this paper, the EHV substation secondary cable laying is considered, and typical capacitance and resistance values of secondary cable to the ground are used. We analyse the influence of distributed capacitance on fault detection when the injected signal is a low-frequency square wave. And then the integral method based on the inject signal is proposed, which can distinguish fault branches from non-fault branches. Furthermore, the influence of the time constant and injected signal frequency is discussed.