干涉型光纤传感局放超声检测灵敏度影响研究
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摘要
针对电力设备局部放电检测灵敏度要求较高的问题,提出不同长度的延迟光纤对基于干涉型Sagnac光纤传感技术的局部放电超声检测系统灵敏度的影响,设计电力设备局部放电模拟装置,搭建干涉型Sagnac光纤法检测局部放电系统,进行局部放电光纤法检测灵敏度理论分析与试验验证。试验证明,在10 kV电压等级下,传感光纤长度在10 km以内,当延迟光纤的长度约为12～18 km时,局部放电频域信号中心频率强度有最大值;当延迟光纤长度为12.353 km时,传感光纤对局部放电时域信号响应的灵敏度较高。研究表明,调节合适的延迟光纤长度,可以提高干涉型Sagnac光纤法检测局部放电时域和频域信号的灵敏度,可为电力设备局部放电光纤法检测灵敏度的提升提供新的思路。
According to the partial discharge(PD) of power equipment requires high detection sensitivity, the detection of Sagnac optical fiber sensing technology of PD system and the influence of different length of delay fibers on the sensitivity of PD detection based on Sagnac optical fiber sensing technique is investigated. In the laboratory, PD signal of power equipment is simulated, a PD optical fiber detection system is built, and the theoretical analysis and experimental verification of sensitivity of PD detection using Sagnac optical fiber sensing are realized. Under the situation of 10 kV voltage and 10 km length of the sensing fiber, the experimental results show that the intensity of PD center frequency is up to maximum at the length of 12-18 km of delay fiber; when the length of the delay fiber is 12.353 km, there is a high sensitivity response to PD timedomain signal. The research shows that the sensitivity of PD signal in time and frequency domain detecting by the optical fiber sensing technology of Sagnac can be improved in proper length of delay fiber, which provides a novel method for improving the sensitivity of partial discharge optical fiber detection in power equipment.
According to the partial discharge(PD) of power equipment requires high detection sensitivity, the detection of Sagnac optical fiber sensing technology of PD system and the influence of different length of delay fibers on the sensitivity of PD detection based on Sagnac optical fiber sensing technique is investigated. In the laboratory, PD signal of power equipment is simulated, a PD optical fiber detection system is built, and the theoretical analysis and experimental verification of sensitivity of PD detection using Sagnac optical fiber sensing are realized. Under the situation of 10 kV voltage and 10 km length of the sensing fiber, the experimental results show that the intensity of PD center frequency is up to maximum at the length of 12-18 km of delay fiber; when the length of the delay fiber is 12.353 km, there is a high sensitivity response to PD timedomain signal. The research shows that the sensitivity of PD signal in time and frequency domain detecting by the optical fiber sensing technology of Sagnac can be improved in proper length of delay fiber, which provides a novel method for improving the sensitivity of partial discharge optical fiber detection in power equipment.
引文
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[12]JANG T S, LEE S S, KWON I B, et al. Noncontact detection of ultrasonic waves using fiber optic Sagnac interferometer[J]. Ultrasonics Ferroelectrics&Frequency Control IEEE Transactions on, 2002,49(6):767-775.
[13]周力行,何蕾,李卫国.变压器局部放电超声信号特性及放电源定位[J].高电压技术,2003, 29(5):11-13.
[14]吴瑞东,王宇,王东,等.光纤振动传感系统相位调制模块的嵌人式设计[J].传感技术学报,2017, 30(2):200-205.
[2]乔学光,邵志华,包维佳,等.光纤超声传感器及应用研究进展[J].物理学报,2017,66(7):111-130.
[3]王有元,王亚军,熊俊,等.振荡波电压下10 kV交联聚乙烯电缆中间接头的局部放电特性[J].高电压技术,2015,41(4):1068-1074.
[4]周远翔,刘睿,张云霄,等.硅橡胶电树枝老化显微图像与局部放电特性对应关系[J].高电压技术,2015,41(1):132-139.
[5]ROSOLEM J B, DINI D C, PENZE R S,,et al. Fiber optic bending sensor for water level monitoring:development and field test:a review[J]. IEEE Sensors Journal, 2013, 13(11):4113-4120.
[6]MA G, MAO N, LI Y, et al. The reusable load cell with protection applied for online monitoring of overhead transmission lines based on fiber Bragg grating[J]. Sensors,2016, 16(6):922.
[7]孙强,秦威,孙睿頔.基于Sagnac干涉的新型光缆径路探测方法研究[J].铁道学报,2014(4):60-64.
[8]LAMELARIVERA H, GARCIASOUTO J A. High resolution interferometric fiber-optic sensor of vibrations in high-power transformers[J]. Optics Express, 2006, 14(21):9679.
[9]郭经红,陈硕,绿立冬,等.电力光纤传感技术及其工程应用[M].北京:科学出版社,2016:84-86.
[10]HE W, SHANGGUAN C, ZHU L, et al. Tunable and stable multi-wavelength erbium-doped fiber laser based on a double Sagnac comb filter with polarization-maintaining fibers[J].Optik-International Journal for Light and Electron Optics,2017, 137:254-261.
[11]何存富,阮力,冯欢,等.基于3×3耦合器的环型Sagnac干涉仪管道监测系统实验研究[J].光电子·激光,2015(6):1125-1131.
[12]JANG T S, LEE S S, KWON I B, et al. Noncontact detection of ultrasonic waves using fiber optic Sagnac interferometer[J]. Ultrasonics Ferroelectrics&Frequency Control IEEE Transactions on, 2002,49(6):767-775.
[13]周力行,何蕾,李卫国.变压器局部放电超声信号特性及放电源定位[J].高电压技术,2003, 29(5):11-13.
[14]吴瑞东,王宇,王东,等.光纤振动传感系统相位调制模块的嵌人式设计[J].传感技术学报,2017, 30(2):200-205.