作者：周翔¹, 雷民¹, 严强虎²

作者单位：1. 中国电力科学研究院有限公司，湖北 武汉 430074;
2. 武汉工程大学电气信息学院，湖北 武汉 430205

关键词：高压高阻标准箱;标准电阻选型;量程自动切换;温湿度检测与控制

摘要：

随着绝缘电阻表、兆欧表等电力测试设备标称使用电压、电阻的增大，对此类设备进行校准的高压高阻标准装置测量范围较小、误差较大的问题更加突出，急需对高压高阻标准箱进行改进。首先通过电阻选型设计标准电阻多档位电路，然后以单片机MSP430F149为主控器，设计高电压测量及量程自动切换模块、温湿度检测与控制模块，通过设计的标准箱可以实现对最高15 kV电压和最高200 GΩ电阻的测量和校准。经上一级计量机构的证书认定，标准箱进行电压测量的各量程示值误差均小于0.5%，对标准电阻校准时最大允许误差在100 Ω~0.1 MΩ电阻范围内为±0.2%，在0.1~10 MΩ范围内为±0.5%，在10 MΩ~200 GΩ范围内为±1%。

An improved design of high voltage and large resistance standard device
ZHOU Xiang¹, LEI Min¹, YAN Qianghu²
1. China Electric Power Research Institute Co., Ltd., Wuhan 430074, China;
2. School of Electrical and Information Engineering, Wuhan Institute of Technology, Wuhan 430205, China
Abstract: With the increase of the nominal voltage and resistance of the electronic insulation resistance meter and other electrical testing equipment, an improved standard device needs to be developed to resolve this situation that the measuring range is small and the error is large. Firstly, the circuit of standard resistance multi-gear has been designed by selecting suitable resistor, and then based on MSP430F149 single-chip microcomputer, the modules of temperature and humidity control system and high voltage measuring with range automatic conversion have been designed. It has achieved measurement of voltage up to 15 kV and calibration of resistance up to 200 GΩ. At last by obtaining the certificate from the superior metrology department, the indication error of each range which used to measure voltage is less than 0.5% and the maximum allowable error of the standard resistance calibration is ±0.2% when calibrating the resistance from 100 Ω to 0.1 MΩ, ±0.5% when calibrating the resistance from 0.1 MΩ to 10 MΩ, and ±1% when calibrating the resistance from 10 MΩ to 200 GΩ.
Keywords: high voltage and large resistance standard device;standard resistance selection;range automatic switching;temperature and humidity detection and control
2020, 46(11):96-101  收稿日期: 2020-03-31;收到修改稿日期: 2020-05-02
基金项目: 国家电网公司科学技术项目（52199916024X）
作者简介: 周翔(1991-),男,安徽淮北市人,硕士,研究方向为高压计量测试
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