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Through analysis of measure data on three 220kV transformer substation in Shanxi China, the results show that harmonic current produced by electrification railroad injects into power system in a proportion through 110kV point of common coupling, and the infiltration coefficient is closed to 1 if harmonic current direction is 110kV to 35kV, this phenomenon coincides with usual law; but there has strong infiltration in harmonic voltage between 110kV and 220kV system, and the infiltration coefficient could be not negligible, it does not coincide with usual law. Therefore, 110kV harmonic distortion produced by electrification railroad not only infiltrates to 220kV system thought coupling transformer, but also disseminates even hundreds of kilometres thought electric fence

Analysis of Harmonics Infiltration Produced by Electrification Railroad on 220kv and 35kv Network