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.
出处
《贵州电力技术》
2016年第2期55-58,18,共5页
Guizhou Electric Power Technology
关键词
PT
二次回路压降
精密电阻
电压跟随器
potential transformer
voltage drop in secondary circuit
precision resistors
voltage follower
