Chen Ruiguo

Study of partial discharge feature based on complex wavelet for large power transformer

The paper presents an approach to realize the complex wavelet method which used in extracting PD (partial discharge) signal features of large power transformer. Real Wavelet Transformation (RWT) is used to analyze and process the signals from the weak insulation in the transformer. But RWT just only extract the eigenvalue of PD signal from real part. Complex Wavelet Transformation (CWT) can extract the eigenvalue from both real part and imaginary part. In this way, the eigenvalue of the PD signal will contain the information from two spaces, and enhance the accuracy of analysis.

Research of multipolar permanent magnet motor with wide constant power for workover

This paper attempts to present an optimal design strategy and characteristics of multipolar permanent magnet synchronous motor(MPMSM) with wide constant power for workover. The structures of stator lamination, rotor lamination and stator winding are analyzed. And how temperature influences the performance of the motor is presented. Moreover, how to calculate air-gap length and the size of permanent magnet of MPMSM are discussed. The MATLAB is used to design the prototype. And, the computer simulation results of magnetic field of the motor are shown by ANSOFT according to its model. The structure and design method of this motor can be used on common MPMSM.