单相接地补偿及选线的微机控制系统

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离电流有功分量及有功功率作为判所。计算简明可靠。该装置通过多次试验，动作迅速灵敏，选线准确，有很好的应用价值。

Microcomputer Control System for Compensating Single-phase Earthing Current and Selecting Line

Aim at a n-arc suppression reactor earthing power system, a suit of microcomputer system for compensating single-phase earthing current and selecting line was designed. This suit of equipment adopts XBSG type arc 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, it is proved that this suit of equipment is very sensitive and credible.