Research on single-phase-to-earth fault location based on Hilbert-huang transform

Distribution network in our country mostly uses the neutral point grounding way directly namely the small current grounding system, and the single-phase earth fault of distribution network fault is about 80%. When single-phase earth fault occurs, the system can still run 1 ~ 2 h. This request in the electric power, as soon as possible accurately find out the fault line and the location, based on traditional switch quantity matrix algorithm is difficult to meet the requirements, so this paper puts forward the online positioning strategy based on Hilbert huang transform.