基于多指标综合评价的配电网接地故障山火风险等级划分

近年来由电力故障引发的森林火灾时有发生，配电网接地故障若未被及时切除，故障电弧可能引燃周边植被，进而引发森林火灾。为开展差异化的防山火措施，提出一种基于多指标综合评价的配电网接地故障山火风险等级划分方法。结合无人机巡线数据、配电线路历史故障数据、气象数据及自主设计的植被电弧燃烧性实验，分析相关山火风险因子。利用德尔菲网络分析法确定各山火风险因子权重及风险得分，加权求和得到山火风险综合得分，从而确定配电线路山火风险等级。对湖南电网某10 kV配电线路进行实际案例分析，验证了该方法能较为准确地划分配电线路山火风险等级，明确线路山火防治重要区段，为面向山火防治的配电线路接地故障处置装置运行机理提供有力辅助参考。

A method for dividing the forest fire risk levels caused by a ground fault risk levels on distribution lines based on multiple index comprehensive evaluation

In recent years, forest fires caused by power faults have occurred from time to time. If a ground fault in power distribution is not cut off in time, the fault arc discharge may ignite the surrounding vegetation, thereby leading to a forest fire. A method for dividing the forest fire risk levels (FFRLs) caused by a ground fault on distribution lines (DLs) based on multiple index comprehensive evaluation is proposed in order to carry out forest fire prevention measures in a differentiated manner. This paper analyzes the relevant forest fire risk factors based on the integration of unmanned aerial vehicle patrol data, the historical fault data of DLs, meteorological data and the self-designed experiment of an arc combustion characteristic parameter (ACCP). The weights and risk scores of various forest fire risk factors are determined by a Delphi technique network-analytic process. Then the comprehensive risk score is calculated by weighting and summing the factors. The FFRLs of DLs can be determined. An actual case analysis with a 10 kV DL in the Hunan power grid verifies that the method can divide FFRLs of DLs accurately, clarify the important sections of forest fire prevention and control of DLs, and a powerful reference can be provided for the ground fault disposal device of DLs facing forest fire prevention and control.