基于分布式光纤振动传感的海底电缆绝缘击穿故障检测
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摘要
为了研究分布式光纤振动传感技术检测海底电缆绝缘击穿的可行性,进行了绝缘击穿实体试验。搭建了绝缘击穿实体试验系统,利用高压脉冲对具有绝缘缺陷的海缆进行冲击;利用分布式光纤振动传感测量设备实时监测缆体沿线的振动信号,利用时空谱图直观展示了击穿故障前后的信号变化,并对击穿点的振动信号进行了时频分析。结果表明,海缆绝缘击穿时会产生强烈的振动,该振动信号的频率成分分布于0~1 000 Hz范围内,分布式光纤振动传感可有效实现海缆绝缘击穿故障的检测和定位。
In order to study the feasibility of distributed optical fiber vibration sensing technology to detect the insulation breakdown of submarine power cables,an insulation breakdown test was carried out.The insulation breakdown test system was set up.The submarine power cables with insulation defect was impacted using the high voltage pulse.The vibration signal of the cable body is monitored in real time using the distributed fiber vibration sensing sensor.The signal changes before and after the breakdown are presented using the time-space spectrogram.The time-frequency analysis of the vibration signal at the breakdown spot is carried out too.Results indicate that a strong vibration will be generated when the submarine power cable insulation is broken down.The frequency of vibration signal is within the range of 0 ~ 1 000 Hz.Detection and location of submarine power cable insulation breakdown can be effectively realized using distributed optical fiber vibration sensor.
In order to study the feasibility of distributed optical fiber vibration sensing technology to detect the insulation breakdown of submarine power cables,an insulation breakdown test was carried out.The insulation breakdown test system was set up.The submarine power cables with insulation defect was impacted using the high voltage pulse.The vibration signal of the cable body is monitored in real time using the distributed fiber vibration sensing sensor.The signal changes before and after the breakdown are presented using the time-space spectrogram.The time-frequency analysis of the vibration signal at the breakdown spot is carried out too.Results indicate that a strong vibration will be generated when the submarine power cable insulation is broken down.The frequency of vibration signal is within the range of 0 ~ 1 000 Hz.Detection and location of submarine power cable insulation breakdown can be effectively realized using distributed optical fiber vibration sensor.
引文
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[5]Wenzel D,Schichler U,Borsi H,et al.Recognition of partial discharges on power units by directional coupling[C]∥Austria Inst.High Voltage Eng,1995:5626-5630.
[6]Heizmann T,Aschwanden T,Hahn H,et al.On-site partial discharge measurements on premoulded cross-bonding joints of 170k V XLPE and EPR cables[J].IEEE Transactions on Power Delivery,1998,13(2):330-335.
[7]颜廷纯,倪承波,周鲁川,等.基于瞬时性故障行波测距的电力电缆绝缘监测技术[J].电气应用,2012,31(3):24-27.
[2]徐丙垠.电力电缆故障探测技术[M].北京:机械工业出版社,1999.
[3]吴明祥,欧阳本红,李文杰.交联电缆常见故障及原因分析[J].中国电力,2013,46(5):66-70.
[4]Katsuta G,Toya A,Muraoka K,et al.Development of a method of partial discharge detection in extra-high voltage cross-linked polyethylene insulated cable lines[J].IEEE Transactions on Power Delivery,1992,7(3):1068-1079.
[5]Wenzel D,Schichler U,Borsi H,et al.Recognition of partial discharges on power units by directional coupling[C]∥Austria Inst.High Voltage Eng,1995:5626-5630.
[6]Heizmann T,Aschwanden T,Hahn H,et al.On-site partial discharge measurements on premoulded cross-bonding joints of 170k V XLPE and EPR cables[J].IEEE Transactions on Power Delivery,1998,13(2):330-335.
[7]颜廷纯,倪承波,周鲁川,等.基于瞬时性故障行波测距的电力电缆绝缘监测技术[J].电气应用,2012,31(3):24-27.