Device and method for detection of inter-turn state of large motor stator winding

Abstract

The invention discloses a device and a method for detecting the inter-turn state of a stator winding of a large motor, and belongs to the product in the field of non-destructive state detection of the stator winding of a large motor. Using the transient rotating magnetic field pulse passing through the two adjacent windings of the stator, it will superimpose and couple the field strength pulse that shows the direction of rotation of the motor. Intuitively, the electric field fluctuation data of the full length of the three-dimensional three-phase windings are displayed in the form of two-dimensional wave waveforms, which are specifically expressed as the distribution parameters of each winding of the motor. For example, which phase of the winding and the inter-turn insulation of the coil decrease, the waveform corresponding to the time domain position of the coil will have a corresponding fault reflection, and each cycle waveform fully reflects the transient electromagnetic characteristics of the corresponding coupling coil turn, which truly reflects the health of the coil.

Description

technical field [0001] The invention relates to a large-scale motor stator winding turn-to-turn state detection device and method, and belongs to the product in the field of large-scale motor stator winding non-destructive state detection. Background technique [0002] At present, for the state detection of large motor stator windings at home and abroad, lumped parameter detection and distributed parameter detection are generally used. The lumped parameter detection includes DC resistance, insulation resistance, partial discharge, dielectric loss, etc., and the distributed parameter detection includes inter-turn insulation impact test. , AC impedance divider method, etc. The detection of inter-turn defects in windings is relatively rough, and only a general judgment can be made on the stator windings. Only when the motor windings are in a serious condition can there be an intuitive performance, and it is impossible to achieve accurate state positioning detection of the entir...

AI Technical Summary

Problems solved by technology

The detection of inter-turn defects in windings is relatively rough, and only a general judgment can be made on the stator windings. Only when the motor windings are in a serious condition can there be an intuitive performance, and it is impossible to achieve accurate state positioning detection of the entire life cycle of the motor windings.

There is no corresponding theory and corresponding detection means for the basic phase-phase coupling magnetic field coupled out of each phase winding

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