基于80296和CPLD的补偿电网微机选线装置的设计

Design of microcomputer-based fault line selection device for compensated distribution networks based on 80296 and complex programmable logic device

分析了补偿电网单相接地故障时故障线路与非故障线路零序电流的分布特性,将补偿电流融入到选线的计算和判断中,提出了一种新的接地选线方法———电流融合法,该方法具有计算简单、保护裕度大选线准确快速的特点,并在此基础上设计了以INTEL80296和CPLD为主控单元的微机选线装置,该装置对装设了预调式消弧线圈的补偿电网的选线具有很高的准确性。

This paper analyzes the distribution characteristic of zero-sequence current of the faulty line and the healthy line in the compensation network when a single phase ground fault occured. It fuses the compensated current into the computation and judgement of fault feeder detection and presents a new arithmetic of detecting fault feeders the fused current method. This method has the advantages of simpleness computation and high protective margin and accuracy. Base on fused current method, the microcomputer fault line selection device is designed,which takes INTEL80296 microprocessor and CPLD as main control units. This device has a high accuracy of earthed fault feeder detection in the compensation network with pre-adjusting arc suppression coil grounding setted.