In order to ascertain lightning-caused breaking mechanism of 10 kV overhead transmission lines and improve the liability of distribution network system

in this paper

from 2 aspects of the simulation and experimental research

the lightning-caused breaking mechanism are analyzed.A mathematical model of multiple physical field coupling during lightning-caused breaking is established.The influence of interaction of heat

electricity

magnetism and force on the course of lightning-caused breaking is analyzed.The 10 kV line lightning test platform is built

the lightning breakdown point distribution test is carried out

and the arc plasma discharge diagnosis and arc shape evolution p

rocess

micro mechanism of internal lightning are analyzed.The simulation and test results show that lightning flashover position is in the insulator near 100

2

00 mm. According to the power supply position

two kinds of simulation models are established.When the power supply position on the left side

arc root is steady combustion at a position after 0.03 s

then lightning-caused breaking fault may occur. Therefore

the paper provides the basis for the lightning-caused breaking protection of 10 kV overhead transmission lines.