文章摘要
李政洋,李景禄,苏盛,等.基于配电网单相接地故障分区的中性点智能电阻接地方法[J].电力系统自动化,2019,43(6):145-150. DOI: 10.7500/AEPS20180808003.
LI Zhengyang,LI Jinglu,SU Sheng, et al.Neutral Point Intelligent Resistance Grounding Method Based on Single-phase Grounding Fault Zone of Distribution Network[J].Automation of Electric Power Systems,2019,43(6):145-150. DOI: 10.7500/AEPS20180808003.
基于配电网单相接地故障分区的中性点智能电阻接地方法
Neutral Point Intelligent Resistance Grounding Method Based on Single-phase Grounding Fault Zone of Distribution Network
DOI:10.7500/AEPS20180808003
关键词: 配电网  小电阻接地  高阻死区  供电可靠性  人身安全  电网安全
KeyWords: distribution network  small resistance grounding  high resistance dead zone  power supply reliability  personal safety  grid security
上网日期:2019-02-19
基金项目:已申请国家发明专利(申请号:2017111358593)
作者单位E-mail
李政洋 长沙理工大学电气与信息工程学院, 湖南省长沙市 410007 851182178@qq.com 
李景禄 长沙理工大学电气与信息工程学院, 湖南省长沙市 410007  
苏盛 长沙理工大学电气与信息工程学院, 湖南省长沙市 410007  
张春辉 长沙信长电力科技有限公司, 湖南省长沙市 410076  
刘洋 长沙理工大学电气与信息工程学院, 湖南省长沙市 410007  
易洲楠 长沙理工大学电气与信息工程学院, 湖南省长沙市 410007  
摘要:
      配电网经小电阻接地方式存在高阻死区,对人身安全、供电可靠性、电网安全皆有一定影响。为了解决小电阻接地方式存在的问题,提出了一种基于单相接地故障分区的配电网智能电阻接地方法。该方法根据电网中性点位移电压及故障线路电流变化将故障分区,在高阻故障区采用双增量启动,快速选线切除故障;在中、低阻故障区采用不同的延时处理,使瞬时性故障恢复,提高配电网的供电可靠性和人身及电网的安全性。开发的装置经试验证明,其具有5 000 Ω的高阻识别处理能力,能使达65 A电流幅值的瞬时性故障恢复,并能准确判断及切除永久性故障。相比小电阻接地方式,智能电阻接地能够有效提高人身安全、电网安全和供电可靠性。
Abstract:
      The distribution network using the small resistance grounding method has a high resistance dead zone, which has certain impact on personal safety, power supply reliability, and grid security. In order to solve the problem of small resistance grounding method, an intelligent resistance grounding method based on single-phase grounding fault zone is proposed. The method divides the faults according to the grid neutral point displacement voltage and fault line current change. In the high resistance fault zone, the double incremental start-up is adopted, and the fault lines are fast selected to remove faults. In the medium and low resistance fault zones, different delay processing methods are adopted to recover transient faults, improving the power supply reliability of distribution network and the personal safety and the power grid security. The developed device has been proved by experiment. It has a high resistance recognition processing capability of 5 000 Ω, which can recover the temporary fault of current amplitude of 65 A, and can accurately judge and remove the permanent fault. Compared with the small resistance grounding method, the intelligent resistance grounding method can effectively improve personal safety, grid security and power supply reliability.
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