Research and application of optical current transducer based on lock-in amplifier in the measurement of EHV DC

WANG Can1; WU Fei-fei2

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Research and application of optical current transducer based on lock-in amplifier in the measurement of EHV DC

更新时间：2025-11-18

- Research and application of optical current transducer based on lock-in amplifier in the measurement of EHV DC
- Vol. 31, Issue 1, Pages: 14-18(2011)
- 作者机构：
  
  1. 湖南省电力公司超高压管理局
  2. 湖南省电力公司调度通信局
- 作者简介：
- 基金信息：
- DOI：
  CLC： TM452
- Published：2011
- 稿件说明：
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[1]王灿,吴菲菲.基于锁定放大器的光学电流互感器的研究及应用[J].湖南电力,2011,31(01):14-18.

WANG Can1, WU Fei-fei2. Research and application of optical current transducer based on lock-in amplifier in the measurement of EHV DC[J]. 2011, 31(1): 14-18.
[1]王灿,吴菲菲.基于锁定放大器的光学电流互感器的研究及应用[J].湖南电力,2011,31(01):14-18. DOI：

WANG Can1, WU Fei-fei2. Research and application of optical current transducer based on lock-in amplifier in the measurement of EHV DC[J]. 2011, 31(1): 14-18. DOI：

摘要

随着电力系统的发展

传统的直流互感器因为种种缺点已经难以适应超高压直流测量的需要。光学电流互感器自问世以来

以其无饱和、高绝缘、抗电磁干扰等诸多优点成为传统电磁式电流互感器的替代产品。但长期以来因种种不利因素的困扰OCT的实用化迟迟没有提上日程。本文针对提高光学电流互感器的输出信噪比展开研究

分析OCT的信噪特性

进行基于相关检测原理的锁定放大器在提高OCT测量精度中的研究和应用

并应用于超高压直流电流的测量中。

Abstract

As the development of the electric power system

traditional DC transducers cannot satisfy measuring requirement of EHV DC.Because of the advantages such as anti-electromagnetism interference

small physical volume and no saturation

the optical current transducers（OCT） based on Faraday effects principle will take place of the conventional current transducers to be employed in the current measurement of the electric power system in the future.But many disadvantages has obstructed the practical turn of OCT for a long time.In this paper

a method to improve the signal/noise ratio（SNR） is discussed and the SNR characteristics of OCT is analysed.The application method to enhance precision for lock-in-amplifier（LIA） based on correlative detection theory is put forward

and it is used in the measurement of EHV DC.

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