李纳纳,王宾.小电流接地配电网馈线单相接地故障零序阻抗特性分析[J].电测与仪表,2024,61(6):58-64. LI Nana,WANG Bin.The analysis of zero sequence impedance characteristics of feeder in distribution system with neutral point non-effective grounding[J].Electrical Measurement & Instrumentation,2024,61(6):58-64.
小电流接地配电网馈线单相接地故障零序阻抗特性分析
The analysis of zero sequence impedance characteristics of feeder in distribution system with neutral point non-effective grounding
Based on the transient zero sequence characteristics, this paper studies the zero sequence transient characteristics of low current grounding system in frequency domain. Starting from the characteristic variable of zero sequence impedance at the line inlet which changes with frequency, this paper deeply excavates the impedance characteristics of zero sequence impedance of each feeder in the distribution network system, discusses the variation law of amplitude and phase angle of zero sequence impedance with frequency in detail, and analyzes different neutral grounding modes and whether the line is sound or not, so as to make better use of zero sequence transient signal and improve fault diagnosis The correct rate of detection lays a solid foundation. Finally, a simulation model is built by PSCAD to verify the characteristics.
