Power frequency magnetic field interference suppression method for online frequency response analysis of power transformers
Yangchun Cheng,
Xiangdong Liu,
Yufei Sha
et al.
Abstract:Frequency response analysis is widely used for the offline diagnosis of winding deformations in power transformers. To apply this approach to a working transformer, the magnitude of the response current needs to be measured by using Rogowski coil sensors across a load current. The saturation of the power frequency magnetic field in these current sensors must be prevented to ensure accurate measurement of such small response currents. Here, a method is presented to suppress the power frequency magnetic field us… Show more
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