环网配电系统短路故障早期辨识研究

Early detection for short-circuit fault in ring main unit distribution system

短路故障早期发现,将有利于提高环网柜配电系统运行可靠性,为此,提出环网配电系统短路故障早期辨识方法研究。基于小波包细节分解算法,研究环网柜系统全相角范围的短路故障早期辨识方法;以三相短路故障为例,建立环网配电系统短路故障仿真模型,分析短路故障及其相关线路的早期故障信号特性,提出基于短路故障早期检测的环网柜故障线路判定方法。仿真实验验证了环网柜配电系统短路故障早期检测及其故障线路判别方法的有效性,为环网配电系统保护研究提供了有益的探索。

It is important for the early detection of short-circuit fault to ring main unit（ RMU） distribution system.A method of short-circuit early detection is expound to RMU system in this paper. Firstly,based on wavelet-packet detail decomposition algorithm,an early detection for short-circuit is discussed in the full range of phase angle.Secondly,for an example of three-phases short-circuit fault,a simulation model for RMU distribution system is set up to analyze the early feature for a fault line and relative lines. A judgment method is put forward to distinguish the fault line of RMU with short-circuit early detection. Furthermore,by results of simulation experiment,it is effective for the fault line identification with short-circuit early detection,that offers a helpful research for the protection to RMU distribution system.