荧光光纤布置方式对局部放电信号检测的影响研究

Influence of fluorescent fibers layout methods on detection of partial discharge signals

局部放电(partial discharge,PD)光测法具有抗干扰能力强、灵敏度高等特点,是电气设备绝缘状态检测的重要和有效方法之一,其信号检出能力与荧光光纤传感器的布置方式息息相关。本文搭建了荧光光纤PD检测实验平台,研究了直线布置和阿基米德布置两种情况下传感器与绝缘缺陷相对距离的变化对PD检测效果的影响,并与常用的特高频法进行了对比。结果表明:阿基米德布置比直线布置具有更高的灵敏度;当荧光光纤与PD缺陷的距离小于45cm时,这两种布置方式下光测法的灵敏度都高于特高频法。对于直线布置,水平距离增加比垂直距离增加对PD检测的不利影响更大。对于阿基米德布置,荧光光纤横向偏移对检测PD的影响大于水平距离。最后,根据两种布置方式的特点和开关柜容易出现PD的位置,给出了荧光光纤在开关柜布置的建议。

Partial discharge optical measurement method has strong anti-interference ability and high sensitivity,becoming one of the most important and effective methods to evaluate the insulation condition of electrical equipment,whose signal detection capability is closely related to the layout way of fluorescent fiber sensor.An experimental platform for fluorescent fiber PD detection was built in this paper.The influence of the relative distance between sensor and insulation defect on the PD detection effect was studied in linear layout and Archimedean layout,and then compared with the commonly used UHF method.The results show that the sensitivity of the Archimedes layout is better than the linear layout.When the distance between fluorescent fiber and PD defect is less than 45 cm,the two layout methods of fluorescent fiber sensors have higher detection sensitivity than that of the UHF sensors.For the linear layout,increasing horizontal distance has a more detrimental effect on PD detection than increasing vertical distance.For the Archimedean layout,the lateral offset of fluorescent fiber has a greater effect on the detection PD than the horizontal distance.Finally,according to the characteristics of the two layouts and the location of switchgear where PD is likely to occur,recommendations for placing fluorescent fibers in the switchgear were given.