文章摘要
齐郑,庄舒仪,何锡祺,等.基于母线扰动信号的配电网混合线路行波故障测距技术[J].电力系统自动化,2019,43(13):124-130. DOI: 10.7500/AEPS20180726009.
QI Zheng,ZHUANG Shuyi,HE Xiqi, et al.Traveling Wave Fault Location Technology for Hybrid Lines in Distribution Network Based on Disturbance Signal Injection at Busbar[J].Automation of Electric Power Systems,2019,43(13):124-130. DOI: 10.7500/AEPS20180726009.
基于母线扰动信号的配电网混合线路行波故障测距技术
Traveling Wave Fault Location Technology for Hybrid Lines in Distribution Network Based on Disturbance Signal Injection at Busbar
DOI:10.7500/AEPS20180726009
关键词: 配电网  单相接地故障  架空线—电缆混合线路  行波故障测距  最小二乘估计
KeyWords: distribution network  single-phase grounding fault  overhead-cable hybrid line  traveling wave fault location  least-square estimation
上网日期:2019-04-26
基金项目:国家自然科学基金资助项目(51777067)
作者单位E-mail
齐郑 华北电力大学院电气与电子工程学院, 北京市 102206  
庄舒仪 华北电力大学院电气与电子工程学院, 北京市 102206 zhuangshuyi2014@126.com 
何锡祺 中国南方电网电力调度控制中心, 广东省广州市 510530  
黄哲洙 国网沈阳供电公司, 辽宁省沈阳市 110003  
摘要:
      中压配电网母线处施加扰动信号与故障指示器相配合实现故障区段定位的技术,得到越来越多的广泛应用。母线处扰动信号源能够产生行波信号,这为故障测距提供了可能。文中提出了一种基于母线扰动信号的单端故障行波测距技术。在发生永久性单相接地故障后,将非故障相母线经电阻接地,依据行波传输原理选取某个有效的线模分量,通过测量该线模分量反射行波到达时刻与扰动信号产生时刻的时间差计算故障距离。分析研究了多分支架空线—电缆混合线路的故障测距解决方案,并应用最小二乘估计对多次测距的结果进行有效融合,得到更为准确的测距结果。仿真与现场试验结果证实了测距技术的准确性。
Abstract:
      The technology of disturbance signal injection at the busbar of medium voltage distribution network and cooperating with fault indicators to locate fault section has been used more and more widely. Disturbance signal sources at busbar can provide traveling wave signals, which provides the possibility of fault location. This paper proposes a traveling wave fault location method based on disturbance signal injection at busbar. If a permanent single-phase grounding fault occurs, the non-fault phase is switched to the ground via a resistance. Then an appropriate aerial mode component is selected according to the principle of traveling wave transmission and the fault distance can be calculated by the time difference between the arrival time of this component and the injection time of disturbance signal. Meanwhile, a solution to calculate the fault distance in the hybrid overhead-cable lines with branches is proposed. The least-square estimation is utilized to effectively merge multiple location results in order to improve the accuracy of fault location. The accuracy of the proposed technology is verified by the simulation and field test results.
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