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

A technology for synchronous motors and internal faults, applied in the direction of motor generator testing, etc., can solve the problems of increased maintenance workload, difficulty in application, large quantity, etc., and achieve the effect of reducing the workload of operation and maintenance

CN114441962APending Publication Date: 2022-05-06TSINGHUA UNIV
0 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2022-05-06

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

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.
Need to check novelty before this filing date? Find Prior Art

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...

Examples

Embodiment Construction

[0072] Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary, and are intended to be used to explain the present application, but should not be construed as a limitation to the present application.

[0073] The following describes the method and device for diagnosing internal faults in the stator and rotor windings of the electrically excited synchronous motor according to the embodiments of the present application with reference to the accompanying drawings.

[0074] in particular, figure 1 This is a schematic flowchart of a method for diagnosing internal faults of stator and rotor windings of an electrically excited synchronous motor according to an embodiment of t...