Method and system for diagnosing internal faults of stator and rotor windings of electrically excited synchronous motor

Abstract

The invention relates to an internal fault diagnosis method and system for stator and rotor windings of an electrically excited synchronous motor, the electrically excited synchronous motor is internally provided with at least one detection coil, and the method comprises the steps: collecting the actual port voltage of the at least one detection coil, extracting at least one fault feature from the actual port voltage, based on the at least one fault feature, calculating the protection sensitivity of the stator internal short circuit fault and the monitoring sensitivity of the rotor excitation winding turn-to-turn short circuit fault; according to the protection sensitivity and/or the monitoring sensitivity, the internal fault type of the stator and rotor winding of the electrically excited synchronous motor is diagnosed, when the protection sensitivity is larger than or equal to a first preset threshold value, the fault type is a stator internal short-circuit fault, and when the monitoring sensitivity is larger than or equal to a second preset threshold value, the fault type is a stator internal short-circuit fault. The fault type is an excitation winding turn-to-turn short circuit fault. Therefore, the internal fault detection function of the stator and rotor winding is realized, the fault type is diagnosed on line by using an algorithm program, and the fault detection sensitivity is improved.

Description

technical field [0001] The present application relates to the technical field of power system detection, and in particular, to a method and system for diagnosing internal faults of stator and rotor windings of an electrically excited synchronous motor. Background technique [0002] As the basic equipment for electric energy production and application, the safe and reliable operation of synchronous motors is of great significance. The internal short circuit of the stator winding is a common and highly destructive fault in the synchronous motor, which must be removed in time to avoid or reduce the fault damage. [0003] Due to the poor processing technology in the manufacturing process and the combined influence of various mechanical, electrical and thermal effects during operation, the inter-turn short-circuit fault of the excitation winding caused by the easy wear of the inter-turn insulation is also a common fault of the synchronous motor. Although it is not as destructive...

AI Technical Summary

Problems solved by technology

[0005] This application provides a method and system for diagnosing the internal faults of the stator and rotor windings of an electric excitation synchronous motor, so as to solve the problem that the current transformers that need to be installed are large in size and large in number and difficult to apply when detecting internal faults in the stator and rotor windings of an electric excitation synchronous motor In the limited space such as mobile energy platform, the problem of increasing maintenance workload and other issues

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