Lightning fault analysis of 10 kV hybrid distribution lines

摘要

Hybrid structure with electric cables and overhead lines are widely used in the 10 kV urban distribution network. In this paper, simulating conditions of the hybrid network are analyzed as an example, a fault simulation test platform combined of bare conductor, insulated conductor and insulators are established, the failure and the influencing factors are analyzed. The results show that: (1) the insulation damage of insulated conductors is the main reason of the line broken; (2) insulation damage will cause the vicious cycle of equipment insulation, which will causes the insulation damage of cable accessories, and then lead to the fault of the hybrid 10 kV distribution network. Aiming at the fault risk of the hybrid 10 kV distribution network, this paper puts forward some applicable countermeasures. The related research results can provide technical reference for the operation and maintenance of the hybrid 10 kV distribution network.