220 kV线路差异化防雷评估与改造技术

西藏电网220 kV线路差异化防雷评估与改造技术,以雷电监测数据、地形地貌为首要评估要素,综合考虑线路走廊的地闪密度、雷电流幅值、塔型、各基杆塔接地电阻实测值等多元参数,制定差异化的防雷技改方案.线路雷击闪络风险综合评估后的治理原则,以“堵”为主.在交直流线路混架的特殊架构下,结合220 kV环网运行经验、防雷调研成果、防雷措施的优缺点以及防雷适用范围的分析与比较,从安装线路避雷器及接地电阻改造入手,进行防雷综合治理,以期降低220 kV输电线路的雷击闪络风险.

220 kV Line Differential Lightning Protection Assessment and Retrofit Technology

Tibet Power Grid 220 kV line differentiation lightning evaluation and transformation techniques to lighming monitoring data, topography primary evaluation factors, considering the line corridor ground flash density, lightning current amplitude, tower, tower grounding resistance of the base measured values and other diversified parameters, to develop differentiated lightning revamping scheme. Line lighming flashover risk comprehensive assessment of governance principles, in order to ＂block＂ based. AC and DC lines mixed in a special frame structure, combined with 220 kV ring operating experience, lightning research results, as well as ighming protection lighming protection measures of the strengths and weaknesses of the scope of analysis and comparison, from installation and grounding resistance line arresters transformation start, carry out lightning comprehensive management, in order to reduce the 290 kV transmission line lightning flashover risk.