智能单相接地及选线系统

Microcomputer-Based System for Detecting and Compensation of Single-phase Earthing Current

针对中性点经消弧线圈接地的小电流接地系统 ,设计了一套单相接地补偿及选线的微机保护装置。本装置采用三相五柱式消弧线圈 ,由PWM脉宽电路供电 ,可实现在线实时调节补偿电流 ,并有效减小谐波电流 ;接地选线装置采用零序电流有功分量及有功功率作为判据 ,计算简便明了且可靠。该装置通过多次动摸试验 ,动作迅速灵敏 ,选线准确 。

Aim at a n-arc suppression reactor earthing power system,we design a suit of microcomputer system for compensating single-phase earthing current and selecting line.This suit of equipment adopts XBSG type are suppression reactor,supplying power by PWM circuit,it can adjust compensating current time by time,and minishes harmonic wave;selecting line part adopts a kind of new criterion-the wattful power component of zero sequence current,simple and convenient for computing and be dependable.By a few times of dynamic model test prove,this suit of equipment is very sensitive and credible.