基于灵活接地系统的故障处理仿真与实践OA

After a single phase grounding fault occurs in the distribution network,the grounding method of the neutral point through arc suppression coils has issues of fault line selection and personal safety,while the grounding method with low resistance has problems of power supply reliability and high resistance identification.For this reason,in a certain distribution real-type test field of State Grid,centralized parameters are used to simulate distributed parameters.It is verified in practice that the flexible grounding method of the neutral point can self-extinguishes the instantaneous grounding arc and restore the insulation of the fault point when a transient ground-ing fault occurs in the power grid,ensuring the reliability of power supply.When it is determined to be a permanent grounding fault,the automatic switching switch dynamically switches to the arc suppression coil and resistance grounding method for rapid fault line se-lection,which has a strong ability to identify high resistance.It verifies the effectiveness and superiority of the flexible grounding method in handling single-phase grounding faults in distribution networks through the combination of simulation on the Matlab simula-tion platform and on-site practice,providing a reference for on-site application.