摘要
为及时准确掌握电力变压器的运行状态,简化变压器内部传感器的安装布置,针对局部放电和油温这两大变压器运行状态关键特征参量,提出基于法布里-珀罗干涉(Fabry-Perot interference)原理的变压器局部放电与油温多参量光纤传感方法。设计了谐振频率在121 kHz的光纤F-P超声探头,采用光强解调法,基于超声波信号实现了油中52.78 pC局部放电的测量;基于同一探头,采用光谱傅里叶解调算法,实现了变压器油温传感,经解调得到的F-P探头腔长变化与热电偶传感器测得的温度变化近似呈线性关系,R^(2)为0.97。研究了温度变化对F-P探头超声传感特性的影响,发现在油温变化时,F-P探头对局部放电超声信号检测的灵敏度出现周期性变化;同时,F-P探头输出光强的直流分量也将快速波动,基于这一特性,也可为监测变压器内部快速温升提供参考。该研究为电气设备状态单光纤多参量检测提供了一种思路。
To accurately and timely grasp the operating state of power transformers and simplify the arrangement of sensors inside transformers,a multi-parameter fiber optic sensing method for transformer’s partial discharge and oil temperature based on the Fabry-Perot(F-P)interference principle is proposed.A fiber optic F-P ultrasonic probe with a resonance frequency of 121 kHz is designed,and the light intensity demodulation method is used to achieve 52.78 pC partial discharge measurement in oil using the ultrasonic signal.Based on the same probe,the spectral Fourier demodulation algorithm is used to achieve transformer oil temperature sensing,the demodulated F-P probe cavity length change is approximately linear with the temperature change measured by the thermocouple sensor,and the R-square is 0.97.Furthermore,the influence of temperature change on the ultrasonic sensing characteristics of the F-P probe is studied,and it is found that the sensitivity of the F-P probe to partial discharge ultrasonic signal detection appears to change periodically when the oil temperature changes;at the same time,the DC component of the F-P probe output light intensity will also fluctuate rapidly.This characteristic can also provide a reference for monitoring the rapid temperature rise inside the transformer.The research in this paper proposes an idea for single fiber multi-parameter detection of electrical equipment state.
作者
张知先
雷嘉丽
陈伟根
蔚超
吴柯洁
项施叶子
ZHANG Zhixian;LEI Jiali;CHEN Weigen;WEI Chao;WU Kejie;XIANG Shiyezi(State Key Laboratory of Power Transmission Equipment&System Security and New Technology,Chongqing University,Chong-qing 400044,China;State Grid Jiangsu Electric Power Research Institute,Nanjing 210024,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2022年第1期58-65,共8页
High Voltage Engineering
基金
国家自然科学基金(U1766217)。
关键词
局部放电
变压器油温
法布里-珀罗干涉
光纤传感
多参量传感
partial discharge
transformer oil temperature
Fabry-Perot interference
fiber optic sensing
multi-parameter sensing