摘要
通过对电缆中间接头局部放电现象的监测可以及时判断其中间接头的绝缘状况,并及早发现绝缘缺陷,降低配电网电缆故障率.提出一种基于相敏光时域反射仪(phase-sensitive optical time-domain reflectometry,φ-OTDR)的分布式光纤传感系统,以相邻弱光栅间的光纤作为传感单元,通过检测相邻弱光纤光栅的干涉信号,可以得到电缆中间接头局部放电声波振动信号的频率、相位和位置等相关信息,从而判断局部放电的强弱及放电位置.实验模拟电缆中间接头局部放电情形,搭建电缆接头局部放电光纤监测系统.在10 k V电压等级下进行实时监测实验,成功检测出局部放电产生的声波信号,其频谱主要分布于9~15 kHz.将传感光纤与电缆复合,或沿电缆铺设,能够做到实时的分布式在线监测.
Monitoring the partial discharge of the intermediate joint of cable can help to judge the insulation condition in time and find latent defects in cable joints as early as possible,so as to reduce occurrence of insulation fault.In this paper,we propose a distributed acoustic sensing(DAS)system based on the enhanced phase-sensitive optical time-domain reflectometry(φ-OTDR)technology.By detecting and analyzing the interference signals between the two adjacent weak fiber Bragg gratings(FBGs)in optical array which is paved along with cable,we can obtain the frequencies,phases,and positions of acoustic signals generated by partial discharge of the cable joint,and then determine the strength and location of partial discharge.In our experiment,by simulating partial discharge of cable intermediate connector in laboratory environment at the voltage of 10 k V,the fiber optic monitoring system is set up,and the acoustic signal by partial discharge is successfully detected.Experimental results show that the proposed DAS system can accurately distinguish weak signal with different frequency and have better frequency response from 9 k Hz to 15 k Hz.The DAS system can achieve the real-time distributed on-line monitoring of partial discharge by the combination of sensing fiber and cable.
作者
皮昊书
韦盈释
陈金锋
陈子涵
吴中
马楠
PI Haoshu;WEI Yingshi;CHEN Jinfeng;CHEN Zihan;WU Zhong;MA Nan(Futian Power Supply Bureau,Shenzhen Power Supply Bureau Co.Ltd.,Shenzhen 518031,Guangdong Province,P.R.China)
出处
《深圳大学学报（理工版）》
EI
CAS
CSCD
北大核心
2020年第1期57-62,共6页
Journal of Shenzhen University(Science and Engineering)
基金
中国南方电网有限责任公司科技研究资助项目(SZKJXM20170324).
关键词
光纤传感
相敏光时域反射仪
弱光纤光栅
干涉信号
电缆接头
局部放电
fiber optics sensors
phase-sensitive optical time-domain reflectometry(φ-OTDR)
weak fiber Bragg grating
interference signal
cable joint
partial discharge
作者简介
Corresponding author:CHEN Jinfeng,Engineer,E-mail:cjfwy163@163.com;皮昊书(1985—),深圳供电局有限公司福田供电局工程师.研究方向:电气工程及其自动化.E-mail:phs0810@163.com
