摘要
低压配电网发生单相断线故障时需要快速应对,而依靠人工巡线发现故障的方法耗时费力。针对低压配电线路单相断线故障展开研究,按照接地情况将其分为3种类型分别进行故障特征的分析,提出基于零序电流幅值与各支路三相电流有效值变化特征的单相断线故障判据,并通过仿真实验进行验证。最后,基于电力物联网设计低压配电网单相断线故障识别报警系统,利用IED、LoRa无线自组网络以及智能网关等关键技术,实现对全局线路信息的采集、通信以及智能化研判,并通过云平台实现移动端的实时监测以及警报接收。
Single-phase disconnection faults in low-voltage distribution networks need to be dealt with quickly,but fault detection methods relying on manual line inspection are time-consuming and laborious.According to the grounding situation,single-phase disconnection faults of low-voltage distribution lines are divided into three types,and the fault characteristics are analyzed respectively.A single-phase disconnection fault criterion based on the variation characteristics of the zero sequence current amplitude and the effective value of the three-phase current of each branch is proposed and verified by simulation experiments.Finally,based on the power Internet of Things,a single-phase line break fault identification and alarm system for low-voltage distribution network is designed.Key technologies such as IED,LoRa self-organizing network and intelligent gateway are used to realize the collection,communication and intelligent research and judgment of global line information,and real-time monitoring and alarm receiving of mobile terminal are realized through cloud platform.
作者
李天友
杨智奇
刘松喜
LI Tianyou;YANG Zhiqi;LIU Songxi(College of Electrical Engineering and Automation,Xiamen University of Technology,Xiamen 361024,China;College of Electrical Engineering and Automation,Fuzhou University,Fuzhou 350108,China;State Grid Fujian Electric Power Co.,Ltd.,Fuzhou 350009,China)
出处
《供用电》
2020年第12期1-7,共7页
Distribution & Utilization
基金
国家电网有限公司总部科技项目(5213302000G1)。
关键词
低压配电网
单相断线
故障识别
零序电流
电力物联网
low-voltage distribution network
single-phase disconnection
fault identification
zero-sequence current
power internet of things
