作者：李磊¹, 杨光², 何泽昊², 刘洋洋¹, 刘小琛¹, 朱重冶³

作者单位：1. 国网天津市电力公司电力科学研究院，天津 300384;
2. 国网天津市电力公司，天津 300000;
3. 宁波三维电测设备有限公司，浙江 宁波 315032

关键词：无线压降测试;同步采样;守时误差;电压互感器

摘要：

该文介绍一种新的电压互感器二次压降测试理念，即采用晶振守时的概念进行压降测量，通过测试主从机之间的晶振变化规律，获得预期的压降相位差值。该方法无需利用外部信号同步，只要测试前进行几分钟的预热，自校后就可保持长达1 h以上的高精度压降测量状态，可以解决之前采用GPS同步法带来的各种问题，满足变电站现场的无线压降测量需求。文章给出详细的原理分析和实测数据，验证守时同步测量法的可行性，该方法的成功是对无线压降测试技术的补充和完善，拓展后对于在线压降监测研究也有积极的意义。

Research on wireless voltage drop test technology based on punctuality principle
LI Lei¹, YANG Guang², HE Zehao², LIU Yangyang¹, LIU Xiaochen¹, ZHU Chongye³
1. State Grid Tianjin Electric Power Company Electric Power Research Institute, Tianjin 300384, China;
2. State Grid Tianjin Electric Power Company, Tianjin 300000, China;
3. Ningbo Sunrise Instruments Co., Ltd., Ningbo 315032, China
Abstract: This paper introduces a new concept of voltage transformer secondary voltage drop measurement, that is, using the concept of crystal oscillator time-keeping to measure the voltage drop. By testing the crystal oscillator change between the master and slave, the expected voltage drop phase difference is obtained. This method does not need to use external signal synchronization, as long as a few minutes of preheating before the test, it can maintain a high-precision voltage drop measurement state for more than 1 h after self calibration, which solves various problems brought by GPS synchronization method before, and can meet the needs of wireless voltage drop measurement in the substation site. In this paper, detailed principle analysis and measured data are given to verify the feasibility of the time-keeping synchronous measurement method. The success of this method is the supplement and improvement of wireless voltage drop measurement technology, and the expansion of this method is also of positive significance for online voltage drop monitoring research.
Keywords: wireless voltage drop test;simultaneous sampling;punctuality error;voltage transformer
2020, 46(10):157-164  收稿日期: 2020-05-29;收到修改稿日期: 2020-06-30
基金项目:
作者简介: 李磊(1985-),男,天津市人,高级工程师,硕士,主要从事电能计量技术研究
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