| 引用本文: | 童 歆,全江涛,徐 菁,夏 天,王 亮.基于电阻取样法测量变压器中性点直流电流的传感器设计与应用[J].电力自动化设备,2015,35(11): |
| TONG Xin,QUAN Jiangtao,XU Jing,XIA Tian,WANG Liang.Design and application of DC sensor based on resistance sampling for measuring neutral DC current of transformer[J].Electric Power Automation Equipment,2015,35(11): |
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| 摘要: |
| 基于电阻取样法设计了用于测量中性点直流的直流传感器。基于电阻取样法的测量原理和双积分型A／D转换器调理电路工作原理，实现了变压器不停电安装中性点电流在线监测装置。设计的直流传感器输出特性与温度基本呈线性关系，便于在线对传感器进行校正。当测量电流大于10 A时，其测量误差为2%；当测量电流小于10 A时，其测量误差小于0.2 A。设计的直流传感器成功运用于现场测量，监测数据表明其运行可靠。 |
| 关键词: 变压器 中性点电流 直流偏磁 在线监测 双积分A／D转换器 测量 传感器 |
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| Design and application of DC sensor based on resistance sampling for measuring neutral DC current of transformer |
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TONG Xin1, QUAN Jiangtao1, XU Jing2, XIA Tian1, WANG Liang3
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1.State Grid Hubei Electric Power Research Institute，Wuhan 430077，China;2.State Grid Hubei Yichang Electric Power Supply Company，Yichang 443000，China;3.Wuhan New Electric Technology Co.，Ltd.，Wuhan 430074，China
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| Abstract: |
| A DC sensor based on the resistance sampling method is designed to realize the installation of the online neutral DC current monitoring equipment during the transformer operation，which is based on the measuring principle of resistance sampling method and the operating principle of dual-integral A／D converter. The output characteristic of designed DC sensor is basically linear with the working temperature，which can be easily online corrected. When the measurement is larger than 10 A，its error is 2% while the measuring error is smaller than 0.2 A when the measurement is smaller than 10 A. The designed sensor is successfully applied on site and the monitored data show its reliability. |
| Key words: electric transformers neutral current DC biasing online monitoring dual-integral A／D converter measurements sensors |
