精准消除PT二次回路压降的方法与应用  

The method and application for effectively eliminating voltage drop in the PT secondary circuit

作　　者：李鹏程 张玉平[2] 姚明哲[3] 徐宏伟 陈伟亮 

机构地区：[1]贵州电网有限责任公司电力科学研究院,贵州贵阳550000 [2]安顺供电局,贵州安顺561000 [3]上海电力学院自动化工程学院,上海200090

出　　处：《贵州电力技术》2016年第2期55-58,18,共5页Guizhou Electric Power Technology

摘　　要：电压互感器(PT)二次回路压降是导致电力企业少计电量的主要原因之一。本文采用精密电阻模块与电压跟随器模块同时工作于PT二次回路的方法精准有效消除PT二次回路压降。该方法计算选择与电能表阻抗匹配的精密电阻模块并联接入PT二次回路出口端,电压跟随器模块串联接入电能表端,其结果等同于电能表接在PT出口端形成计量二次回路,准确消除了PT二次回路从出口端至电能表端的压降。实际应用现场的测试数据分析表明,使用该方法制造的装置有效解决了PT二次回路压降问题,装置运行稳定可靠,具备很高的推广价值。The voltage drop in the PT secondary circuit was one of the main reasons of leakage of electricity measurement. A new method based on voltage follower and precision resistors working in the PT secondary circuit at the same time,was proposed to eliminate the voltage drop accurately. The precision resistors that were matching the resistors of electric energy meter,connect in parallel to the secondary circuit near the PT. The voltage follower was series connection to the secondary circuit near the electric energy meter. The device eliminated accurately the voltage drop between PT and the meter. The analysis of measurement data from practical applications verified the performance of the proposed device and its application feasibility,had a high popularization value.

关 键 词：PT 二次回路压降 精密电阻 电压跟随器 

分 类 号：TM93[电气工程—电力电子与电力传动]