文章摘要
郭金刚,司磊,袁志军,等.光纤电流互感器光路故障自诊断告警算法[J].电力系统自动化,2018,42(21):172-177. DOI: 10.7500/AEPS20171117005.
GUO Jingang,SI Lei,YUAN Zhijun, et al.Self-diagnosing Alarm Algorithm for Optical Path Fault of Fiber Optical Current Transformer[J].Automation of Electric Power Systems,2018,42(21):172-177. DOI: 10.7500/AEPS20171117005.
光纤电流互感器光路故障自诊断告警算法
Self-diagnosing Alarm Algorithm for Optical Path Fault of Fiber Optical Current Transformer
DOI:10.7500/AEPS20171117005
关键词: 光纤电流互感器  干涉光强  光路故障告警  调制解调方法
KeyWords: fiber optical current transformer(FOCT)  interference light intensity  light path fault alarm  modulation and demodulation methods
上网日期:2018-08-29
基金项目:国家电网公司总部科技项目(KY-SG-2017-1-LJDKY)
作者单位E-mail
郭金刚 国网内蒙古东部电力有限公司电力科学研究院, 内蒙古自治区呼和浩特市 010000  
司磊 北京航天时代光电科技有限公司, 北京市 100094 slxjy2007@sina.com 
袁志军 国网内蒙古东部电力有限公司电力科学研究院, 内蒙古自治区呼和浩特市 010000  
林海丹 国网吉林省电力有限公司电力科学研究院, 吉林省长春市 130000  
石海鹏 国网内蒙古东部电力有限公司电力科学研究院, 内蒙古自治区呼和浩特市 010000  
敖明 国网吉林省电力有限公司电力科学研究院, 吉林省长春市 130000  
摘要:
      介绍了全光纤电流互感器工作原理及光路告警原理,提出并实现光纤电流互感器干涉光强调制解调算法。在调制偏置波形的基础上,引入周期性误差量δ,通过解调算法有效解调出干涉光强大小。测试表明,干涉光强的解调能够有效反映出光纤电流互感器光路衰减、偏振态劣化、突然断裂等故障,同时误差量δ的引入并不影响原来电流大小、调制器误差量ε的解调,光纤电流互感器闭环系统仍然能够在-40 ℃~+70 ℃范围内,保持GBT20840.8标准0.2级准确度。实验结果证明了所述方法的正确性。
Abstract:
      The working principle of fiber optical current transformer(FOCT)and fault alarm principle of optical path are introduced. The interference light intensity modulation and demodulation methods of FOCT are proposed and realized. The error δ is introduced periodically on the basis of modulating waveform, so the interference light intensity is effectively demodulated by the demodulation algorithm. The test shows that the demodulation of the interference light intensity can effectively reflect the failures of the FOCT, such as the attenuation of the optical path, the deterioration of the polarization state, and the sudden fracture. Meanwhile, the introduction of the error δ does not affect the original current and the modulator error ε, and the 0. 2-level accuracy of GBT20840. 8 standard can be achieved within the range of -40 ℃~+70 ℃ in the FOCT closed-loop system. The correctness of the method is proved by experimental results.
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