电压互感器二次断线对三相三线计量的影响分析  

Influence analysis of voltage transformer secondary disconnection on three-phase three-wire measurement

作　　者：邓得政 赵若阳 Deng Dezheng;Zhao Ruoyang(State Grid Tianjin Dongli Power Supply Company,Tianjin 300300;State Grid Tianjin Chengnan Power Supply Company,Tianjin 300000)

机构地区：[1]国网天津东丽供电公司,天津300300 [2]国网天津城南供电公司,天津300000

出　　处：《电气技术》2020年第5期98-102,共5页Electrical Engineering

摘　　要：本文结合智能电表计量特性,利用相量图法分析了电压互感器二次回路断线时接入三相三线电能表的二次侧电压幅值和相位的变化,并在此基础上提出了断线相的判别方法,推导了二次断线各种情况下的有功计量公式及更正系数的计算公式。Combined with smart metering characteristics, the change of the voltage amplitude and phase of the secondary side under PT secondary circuit disconnection of the three-phase three-wire meter was analyzed by phasor diagram method. Then disconnection phase judgment method was gived based on the analysis of voltage changes. Finally, the formula of active power and correction coefficient under various conditions of secondary disconnection were derived.

关 键 词：二次回路断线 三相三线 电压变化 

分 类 号：TM933.4[电气工程—电力电子与电力传动] TM451