异频法的计量装置二次回路错误接线识别方法  

Research and application of the secondary circuit measurement circuit connection error base on the different frequency

作　　者：何兆磊 朱梦梦 HE Zhaolei;ZHU Mengmeng(Yunnan power grid co.Ltd Qujing Power Supply Bureau,Qujing 655000,Yunnan,China;Yunnan power grid co.Ltd electric power research institute,Kunming 650217,China)

机构地区：[1]云南电网有限责任公司曲靖供电局,云南曲靖655000 [2]云南电网有限责任公司电力科学研究院,昆明650217

出　　处：《云南电力技术》2018年第4期38-40,45,共4页Yunnan Electric Power

摘　　要：针对现有计量二次回路正确性验收过程中存在的问题,提出一种基于异频特征信号的计量二次回路接线错误判别方法。对电流互感器等效电路进行建模并分析其二次侧阻抗特性,从理论上验证该方法的可靠性。利用信号发生器在互感器二次端子处注入异频特征信号,通过高精度传感器在电能表尾端检测高频特征信号,实现了在不拆接二次回路的情况下判断回路的相别、极性、通断。该种方法及设备可以巧妙高效的解决电能计量装置投运前验收工作所存在的问题,提高现场作业安全保障,保证计量准确性、公正性。Aiming at the problems existing in the process of acceptance work of correctness of the secondary circuit measuremenL this paper presents a method for error identification of the secondary circuit connection based on the different frequency characteristic signal. By modelling the equivalent circuit of the current transformer and analysing its secondary side impedanee~ the reliability of this method can be proved theoretically. By means of injecting the different frequency characteristic signal into the secondary terminal of the transformer by the signal generator, and detecting the different frequency characteristic signal by the high precision sensor at the end of the electric energy meter, judging the phase identifieation, polarity and break-make can be achieved without disconnecting the secondary circuit. This method and equipment can be a clever and efficient solution to the existing problems of acceptance work before putting the energy metering device into operation, improves the safety of site staff, ensure the accuracy of measurement and fairness.

关 键 词：计量二次回路 错误判别 特征信号 

分 类 号：TM74[电气工程—电力系统及自动化]