Research on the Influence of Fault Grounding Resistance on Electrical Energy Information under Single-Phase Grounding Fault

Abstract

The highest rate of single-phase grounding fault occurs in small-current grounding system, accounting for about 80% of the distribution network grounding faults, single-phase grounding fault routing methods are based on the identification of electrical energy information under single-phase grounding faults in the distribution network. Therefore, it is an important prerequisite for accurate single-phase grounding fault routing to obtain the change law of electrical energy information under different fault states. In this article , by establishing the simulation model of single-phase grounding fault in distribution network, we simulate and analyze the change law of electric energy information under 10 Ω, 100 Ω and 1000 Ω fault grounding resistance, and the results show that: with the increase of fault grounding resistance, the current amplitude of fault phase gradually decreases and the voltage amplitude gradually increases. Fault grounding resistance from 10 Ω to 1000 Ω process, the fault phase current amplitude from 476 A to 32.72 A, the current amplitude reduced by about 14 times. The fault phase voltage increases from 7.317 kV to 9.852 kV, and the voltage amplitude is close to the normal working voltage. The fault grounding resistance has a large impact on the electrical energy information of the distribution network.