谐振接地系统接地故障选线技术分析

文章介绍了谐波法、有功分量法、注入信号法、中电阻法、残流增量法、小扰动法、首半波法、新型暂态法、行波法、综合法等几种谐振接地系统接地故障选线新方法的基本选线原理,分析了各种选线方法的选线可靠性以及安全性、适用性等其他性能。从国内外的应用情况来看,以中电阻法为代表的主动式选线方法和基于暂态信息的被动式选线方法最具发展潜力。对于稳定性接地故障,中电阻法效果较为理想;而暂态选线法则在处理间歇性接地故障、弧光接地故障中成功率更高。综合来看,暂态法在保持高选线成功率的基础上,在系统安全性、经济适用性等方面具有更为明显的优势。但由于暂态法的原理不如中电阻法简单明了,用户接受起来有一定困难。用户应根据具体条件谨慎选择各种选线方法。

The Technology Analysis of Earth Fault Protection in Resonant Grounded System

The basic principle of several new methods of earth fault protection in resonant grounded system are introduced, such as harmonic method, active component method, injecting signal method, the shunt resistance method, the remnant current increment method, the small disturbance method, the traveling wave method, the initial polarity method, the transient signals method, integrated method and so on. The performances of these methods about reliability, security, and serviceability, so on are analyzed. From the application in field, the active methods represented by the shunt resistance method and the passive methods based on transient signals have the greatest development potential. For the stable earth fault, the effect of the shunt resistance method is better; for the intermittency earth fault and the arc earth fault, the transient signals method is better. In the same time, the transient signals method has the obvious advantage in the system security, economical serviceability and so on. But the principle of the transient signals method is not simple as the shunt resistance method, so the users accept it with a little difficulty. These methods should be selected seriously according to the practical conditions.