谐振接地电网单相接地故障选线的研究  

Research on Detecting Single-phase-to-ground Faulted Feeder in Resonant Grounded Power Distribution System

作　　者：陈奎[1] 唐轶[1] 刘长江[1] 董海波[1] 

机构地区：[1]中国矿业大学,徐州221008

出　　处：《高电压技术》2007年第1期61-65,共5页High Voltage Engineering

基　　金：中国矿业大学青年科研基金资助项目(2005A010)

摘　　要：为解决小电流接地系统单相接地选线中谐振接地电网的单相接地选线问题和现场应用中现有方法存在的选线不准确问题,在详细分析补偿电网零序测量电流分布后将消弧线圈补偿电流融入小电流接地选线计算和判断中,提出了一种新的针对谐振接地电网的、基于单相接地故障工频稳态量分析的小电流接地选线算法。EMTP仿真分析显示该算法具有较高的保护裕度。初步挂网运行试验也证明了该方法具有较高的选线准确性。In the resonant grounded power distribution system, the magnitude and direction of zero sequence measuring current in the faulty line is different from the current in the ungrounded power system when a single phase earth fault happens because of the compensation effect of the inductive current in arc suppression coil on the capacity ground current. Because the magnitude of zero sequence measuring current is connected with the compensation degree of arc suppression coil, the condition in resonant grounded power distribution system is more complicated than in ungrounded power system. Therefore the fault detection in a resonant grounded power distribution system is a tickler in indirectly earthed power system and the most existing methods used in field have the question which cannot find the faulty line accurately. On the basis of detailed analysis of the zero sequence measurement current distribution in resonant grounded power distribution system, a new detecting one-phase-to-ground fault feeder calculation method is proposed in this paper, which adds the arc suppressing coil compensation current to the zero sequence current of every feeders,is armed at the resonant grounded power distribution system and is based on the stable state analysis. EMPT simulation and analysis show that this calculation method has effectively raised the protecting abundant degree. The operation results of the power system indicated that the device which is developed in the calculation method has a high accuracy in the detecting fault feeder in the indirectly earthed power system regardless of running state including under compensation state, full compensation state and over compensation state.

关 键 词：配电网 小电流接地电网 小电流接地选线 单相接地故障 准确性 

分 类 号：TM864[电气工程—高电压与绝缘技术]