摘要
在谐振接地系统的各种选线装置中,零序电流突变量法得到了较多的运用。但在实用中,如当发生间歇性电弧接地故障时,盲目地使用零序电流突变量法将造成选线失效。本文在阐述其运用原理基础上提出了基于小波分析的零序电流突变量法,使得系统能够自动识别故障类型,自适应地采用零序电流突变量法或暂态选线方法,从而提高了选线成功率。研究表明,该方法在选线装置中的引入将大大提高谐振接地电网的选线性能。
The method of zero-sequence current incremental quantity is widely applied to various fault line selection devices of resonant grounding system. However, in case of intermittent arc-earth faults, the blind use of this method will cause the failure in fault line selection. This paper presents the application principle of this method, then introduces the wavelet analysis into this method in order to enable the system to identify the earthing fault types automatically and adopt the zero-sequence current incremental quantity method or transient fault line selection method self adaptively. The fault line selection performance of the resonant grounding power grid would be greatly improved with this method introduced to the line selection equipment.
出处
《华东电力》
北大核心
2013年第10期2115-2118,共4页
East China Electric Power
关键词
谐振接地
零序电流突变量
小波分析
自适应
选线
resonant grounding
zero-sequence current incremental quantity
wavelet analysis
self-adaptation
fault line selection
