A single-phase ground fault of the AC substation will cause electrical interference to the adjacent pipeline, mainly reflected in the touch voltage, step voltage, and coating breakdown voltage of the pipeline exceed the safety threshold. In order to evaluate the electrical interference effect of an AC substation on adjacent pipelines, the numerical simulation method is used to calculate the relevant safety parameters of the pipeline during the single-phase ground fault of the substation. For the case of touch voltage of the pipeline exceeding the safety threshold, the mitigation methods have been obtained by the software calculation. The specific mitigation method is to connect the pipeline to the grounding of the valve room through the solid state decoupler, and then set the gradient mitigation line in parallel with the pipeline near the substation.

Subject
Substations, Voltage, Valves, Zinc anodes, Pipelines, Soil resistivity, Grounding, Joints, Health, safety, and environment, Zinc, Electrical interference, Electrodes, Fault currents
Keywords:
AC substation, Pipeline, Valve chamber, Electrical interference
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2022
Association for Materials Protection and Performance (AMPP)
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