Research Of The Grounding Measurement System Based On Virtual Instruments In Substation

In the present grounding measurements in substations, the large electric current method is used to raise the ratio of signal to noise, but this method does not obviously decrease the measurement error. The test instruments are unwieldy, and it is easy to threaten personal safety. At present, the small electric current method is widely used in the grounding measurements of ground grids in foreign countries. The test instruments based on this method are highly precise, but costly.The author develops a grounding measurement system of substations based on the Virtual Instruments, which uses LabVIEW as the development software and adopts the small electric current method. The FFT method is used to process the measurement data, which can decrease the measurement error. The testing process is easy to operate, and the cost of the grounding measurement system is relatively low. It is easy to maintain and expand the grounding measurement system. The test experimentations verify that the grounding measurement system of this paper can fulfill the demand of the small electric current test, and be applied to the engineering measurements.