基于脉冲同步的配电电缆局部放电在线监测及定位方法  

Online Monitoring and Location Method of Partial Discharge of Distribution Cable Based on Pulse Synchronization

作　　者：霍鹏[1,2] 李锐鹏 张子骁 任少义 HUO Peng;LI Ruipeng;ZHANG Zixiao;REN Shaoyi(Xi’an Jiaotong University,Xi’an 710049,China;Longyuan(Beijing)Renewable Energy Engneering Technology Co.,Ltd.,Beijing 100034,China;Xi’an XD Switchgear Electric Dalian Co.,Ltd.,Xi’an 710077,China;Xi’an High Voltage Apparatus Research Institute Co.,Ltd.,Xi’an 710077,China)

机构地区：[1]西安交通大学,西安7140049 [2]龙源(北京)新能源工程技术有限公司,北京100034 [3]西安西电开关电气有限公司,西安710077 [4]西安高压电器研究院股份有限公司,西安710077

出　　处：《高压电器》2024年第8期129-138,共10页High Voltage Apparatus

摘　　要：为了解决配网电缆局部放电在线定位难题,文中提出了一种基于脉冲同步的配电电缆局部放电双端在线定位方法,并研制了面向泛在电力物联网的配电电缆在线监测系统。首先,通过向电缆中注入脉冲信号,实现双端系统的时钟同步,并获得高频信号在电缆中的传播速度,解决了到达时间分析方法在配网电缆应用中同步困难的问题,并提出了采用基于能量法估计的局部放电脉冲到达时间,提高局部放电定位结果的鲁棒性。然后,描述了面向泛在物联网的配网电缆局部放电在线监测要求和架构。其次,详细讨论了关键硬件的实现方法,包括增益可调的高频电流互感器和感性脉冲注入装置。最后,为了验证提出方法和系统的有效性,在实验室10 kV电缆上进行了局部放电模拟试验,实验结果表明,提出的定位方法相比于传统的基于GPS同步的定位方法定位精度显著提升。此外,利用研制的测试系统对风电场真实的35 kV电缆进行了现场测试,验证了提出方法的可行性。For solving the problem of partial discharge online location of cable of distribution network,a kind of two-terminal online location method of partial discharge of distribution cable based on pulse synchronization is proposed in this paper,and an online monitoring system of distribution cable for ubiquitous power internet of things is developed.First,the clock synchronization of the two-terminal system is achieved by injecting pulse signals into the cable,and the propagation speed of the high-frequency signal in the cable is obtained.The problem that the arrival time analysis method is difficult to synchronize in the application of the distribution cable is solved,the estimation of the partial discharge pulse arrival time based on the energy method is proposed to improve the robustness of the partial discharge location results.Then,the requirements and architecture of partial discharge(PD)online monitoring of cable of distribution network for the ubiquitous internet of things are described.Then,the realization method of key hardware,including high frequency current transformer with adjustable gain and inductive pulse injection device,is discussed in detail.Finally,partial discharge simulation tests are performed on 10 kV cable in the laboratory in order to verify the effectiveness of the proposed method and system.The experimental results show that,compared with the traditional location method based on GPS synchronization,the location accuracy of the proposed location method is significantly improved.In addition,the developed test system is used to test the real 35 kV cable in the wind farm at site,and the feasibility of the proposed method is verified.

关 键 词：电缆 局部放电 定位 同步 泛在物联网 

分 类 号：TM855[电气工程—高电压与绝缘技术]