Research on automatic phase alignment and calibration method of transformer bushing FDS measurement based on adaptive Kalman filter

The safety and reliability of transformers are directly related to the stable operation of power grids. Bushings are one of the key components of transformers. At present, frequency domain dielectric spectroscopy measurement technology is widely used in the evaluation of transformer insulation status. However, the phase alignment effect of the measurement results of this method is poor, and the calibration method relies on manual adjustment or simple fixed algorithms, which cannot guarantee high accuracy and real-time performance. Based on the Kalman filter algorithm, this paper considers the actual operation of the bushing and proposes an automatic phase alignment and calibration method for FDS measurement. The automatic correction of phase error in realtime measurement is realized, the FDS measurement accuracy is improved, and the phase error is reduced.