Power substation magnetic field measurement using digital signal processing techniques

In this paper, a method is presented for measurement of power frequency mag netic fields due to distorted sinusoidal currents in power system. The prop osed method is an integral approach and consists of a multi-rate digital si gnal processor, an adaptive filter, and an overlap processor. In field test , actual test results are accomplished by a standard area-type measurement setup to identify and characterize magnetic fields distribution of a 69kV S F6 -gas insulated substation (GIS) using the proposed method.