In this paper

the actual operation of the arrester leakage current sensor is tested in a 1 000 kV UHV substation.There are some problems

such as too large data acquisition error and drastic changes.To solve the problem of inaccurate data collection of lightning arrester leakage current in UHV substation purposefully.Verify that the arrester leakage current sensor acquisition accuracy is affected by the power frequency magnetic field under setting up a test environment in the substation reactor area

both are approximately linear.Establish a power frequency magnetic field simulation environment in the laboratory

perform acquisition accuracy tests on current sensors with different structures under power frequency magnetic field interference

it shows that the passive fully enclosed leakage current sensor has the best resistance to power frequency magnetic field.It provides a reference for the design and selection of on-line monitoring equipment for UHV substation.