某地区配电线路防雷现状分析及防雷装置研究

Study on Lighting Protection Situation and Device of 10 kV Distribution Lines

随着10 kV配电线路绝缘化率的提升,雷击导线断线问题日益凸显,雷击断线约占配网雷击跳闸事故的49%,因此有必要研制针对性的防雷改造装置,有效降低雷击断线几率,提高配电线路的供电可靠性。以某地区典型配电线路为研究对象,分析和总结了该地区线路和故障概况;研制了双间隙型氧化锌避雷器,介绍了该装置的结构和原理,通过试验确定了该装置的主间隙和辅助间隙的规格参数,测试了该装置的伏秒特性和工频续流遮断能力。最后,通过在典型线路上进行工程运用,验证该装置的防雷效果。

Lightning-caused line break became more and more serious with application of 10 kV Insulation-covered distribution lines.According to statistic,49%of lightning stroke tripping happen on distribution lines.It is necessary to develop lighting protection device to reduce lightning-caused break probability and improve power supply reliability.By taking typical 10 kV distribution lines as example,the situation and tripping scenarios are analyzed in detail.An arrester with two cascade gaps are adopted and improved.The spherical electrode and main gap parameters are determined by experiments.The volt-second characteristic of lightning impulse and current cut-down ability are also tested.The lighting protection ability of arrester with two cascade gaps are both verified by engineering application.