三相四线制电能表失流判断方法改进及应用  

Improvement and Application of Determination to Three-Phase Four-Wire Meter Flow Loss

作　　者：张文霞[1] 

机构地区：[1]内蒙古电力科学研究院,内蒙古呼和浩特010020

出　　处：《内蒙古电力技术》2013年第4期83-85,共3页Inner Mongolia Electric Power

摘　　要：在计量0.4 kV系统用电负荷中,普遍采用的是通过写入到电能表中的计算表达式来判断三相负荷电流不平衡及其电流回路是否有失流或接线错误等情况,该方法不准确,多数情况下电能表报警均属误报。针对这一问题,通过改变三相四线制电能表结构,增加中性线电流采集模块,将采集到的中性线电流输入到电能表中,并设定与三相负荷电流向量和的模数差值,利用差值可以准确判断电能表电流回路的运行情况。改进后的失流判断方法在具体应用中能够保证电能计量的准确性。In measuring 0.4 kV power system load, the usual way to determine the unbalancing of the three phase, and flow loss or wiring error is through the evaluates expressions written to the watt-hour meter, which is not accurate resulted in false positives. Therefore,change the structure of three-phase four-wire watt-hour meter, increase the neutral current acquisition module, input the collected neutral point current to the watt-hour meter, and set the difference of vector sum with three-phase load current, which can be used to accurately judge the watt-hour meter operations of current loop.

关 键 词：0 4 KV系统 三相四线制电能表 电能计量 失流判断 零序电流 

分 类 号：TM933.1[电气工程—电力电子与电力传动]