Automatic Measurement Technology of Transformer Winding Short Circuit Impedance Based on Partial Discharge Ultrasonic Signal
In order to prevent transformer winding deformation and extend the service life of the transformer,an auto-matic measurement technology for transformer winding short-circuit impedance based on partial discharge ultrasonic signals is proposed.Obtain the ultrasonic signal of transformer partial discharge,and use wavelet to extract the fea-tures of transformer partial discharge ultrasonic signal.By using the bidirectional two-dimensional principal component analysis algorithm(2DPCA)to reduce the dimensionality of redundant feature information and combining the energy change rate of features,the short-circuit status of transformer windings is detected.If a transformer experiences a winding short circuit,combined with the equivalent circuit model of the transformer,the short-circuit impedance of the transformer winding can be automatically measured,and the measurement results can be corrected by reducing the automatic measurement error of the transformer.The experimental results show that the error of this method in auto-matically measuring the short-circuit impedance of transformer windings is small,and an excessive load rate will not affect the automated measurement results of transformer winding short-circuit impedance using this method.At the same time,the transformer winding status can be detected based on partial discharge ultrasonic signals.
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