Analysis on Fault Mechanism of Fiber-optical Current Transformers with Sine Wave Modulation

Fubin PANG; Peng LI; Xu WEI; Jieqing DENG; Yu LIU

doi:10.7500/AEPS20200401004

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Analysis on Fault Mechanism of Fiber-optical Current Transformers with Sine Wave Modulation

Application Research | 更新时间：2025-06-16

- Analysis on Fault Mechanism of Fiber-optical Current Transformers with Sine Wave Modulation
- Automation of Electric Power Systems Vol. 44, Issue 17, Pages: 153-160(2020)
- 作者机构：
  
  1.国网江苏省电力有限公司电力科学研究院，江苏省南京市 211103
  2.国网江苏省电力有限公司，江苏省南京市210024
- 作者简介：
- 基金信息：
  
  National Natural Science Foundation of China
- DOI：10.7500/AEPS20200401004
  CLC：
- Received：01 April 2020，
  
  Revised：2020-05-06，
  
  Published Online：17 July 2020，
  
  Published：10 September 2020
- 稿件说明：
移动端阅览
庞福滨,李鹏,魏旭等.正弦波调制的全光纤电流互感器故障机理分析[J].电力系统自动化,2020,44(17):153-160.

PANG Fubin,LI Peng,WEI Xu,et al.Analysis on Fault Mechanism of Fiber-optical Current Transformers with Sine Wave Modulation[J].Automation of Electric Power Systems,2020,44(17):153-160.
庞福滨,李鹏,魏旭等.正弦波调制的全光纤电流互感器故障机理分析[J].电力系统自动化,2020,44(17):153-160. DOI： 10.7500/AEPS20200401004.

PANG Fubin,LI Peng,WEI Xu,et al.Analysis on Fault Mechanism of Fiber-optical Current Transformers with Sine Wave Modulation[J].Automation of Electric Power Systems,2020,44(17):153-160. DOI： 10.7500/AEPS20200401004.

摘要

正弦波调制的全光纤电流互感器(FOCT)在直流输电工程中得到了广泛应用，但其在实际运行中故障率远高于电磁式电流互感器，严重威胁电网的安全运行。为研究FOCT的故障机理，建立了FOCT输出信号模型，分析了其调制、解调的基本方法，给出了计算被测电流时所用信号处理方法的影响因素，指出FOCT的光回路及调制回路通过改变探测器输出信号中二次谐波分量的大小而影响FOCT的工作状态，当两回路参数的改变造成二次谐波幅度低于FOCT检测要求时将导致其出现测量故障，并据此将FOCT的故障划分为光回路故障和调制回路故障。仿真计算了光回路和调制回路对二次谐波影响的基本规律，并给出了2种故障的特征差别。最后，开展了FOCT的光回路和调制回路故障模拟试验，试验结果验证了理论分析的正确性。

Abstract

The current transformer (FOCT) with sine wave modulated fiber-optical has been widely used in DC transmission project

but its failure rate is much higher than that of electromagnetic current transformer in actual operation

which seriously threatens the safe operation of power grid. In order to study the fault mechanism of FOCT

the output signal model of FOCT is established

and the basic methods of modulation and demodulation are analyzed. The influencing factors of signal processing methods used to calculate the measured current are given. It is pointed out that the optical circuit and modulation circuit of FOCT affect the working state of FOCT by changing the second harmonic component in the output signal of the detector. When the second harmonic amplitude is lower than the detection requirements of FOCT caused by changing parameters of two circuits

it will lead to measurement fault. According to this

FOCT faults can be divided into optical circuit fault and modulation circuit fault. The influence of the optical circuit and the modulation circuit on the second harmonic is simulated

and the characteristic difference between the two kinds of faults is given. Finally

the simulation tests of optical circuit and modulation circuit faults for FOCT are carried out. The test results verify the correctness of the theoretical analysis.

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references

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