Identification Method of Brushless Exciter Armature Winding Short Circuit and Diode Phase Fault

Abstract

The present invention relates to a method for identifying armature winding short-circuit and diode phase failure faults in a brushless exciter, comprising the following steps: obtaining the excitation current of the stator excitation winding of the brushless exciter; preprocessing the excitation current to obtain a preprocessed current; and identifying armature winding short-circuit and diode phase failure faults in the brushless exciter based on the preprocessed current. The present invention can accurately identify whether a brushless exciter fault is an armature winding short-circuit or a diode phase failure, and then perform corresponding control based on the identification result. This method can avoid serious consequences caused by misjudgment, improve unit safety, prevent excitation system shutdown caused by misjudgment, and effectively enhance reliability.

Description

Technical Field

[0001] The present invention relates to the technical field of power systems, and more particularly to a method for identifying armature winding short circuit and diode phase failure faults of a brushless exciter. Background Art

[0002] The excitation system is a crucial component of large generators. A high-performance, highly reliable excitation system is essential for ensuring generator safety and stable power system operation. Compared to static excitation, brushless excitation systems eliminate the generator's carbon brushes and slip rings, significantly improving excitation system reliability and becoming the preferred excitation method for large-capacity nuclear power units. Multiphase brushless excitation systems not only reduce the individual diode capacity requirements of high-power excitation systems but also enhance the quality of the rectified voltage and improve system fault tolerance.

[0003] Because the rectifier diodes rotate at high speed and only one fuse is installed at the output of each bridge arm, single-phase open-circuit faults caused by diode damage are common in actual operation. In the initial stages of an open-circuit fault, the exciter can still provide normal current to the main generator. However, if the fault is allowed to worsen, it will seriously affect the normal operation of the main generator, resulting in serious consequences. For example, a single-phase ground fault on phase C of the No. 3 main transformer at a power plant caused a phase open fault in the exciter's rotating diode and a stator winding ground fault. The rotating diode then misidentified a two-phase open fault, triggering an excitation system shutdown and requiring nearly 20 days of emergency repairs.

[0004] At the same time, the short-circuit fault of the rotating armature winding is also one of the typical internal faults of the brushless exciter. The fault will deteriorate rapidly, and the excitation current level provided by the exciter to the main generator will decrease. The heat generated by the huge short-circuit current caused by the fault may also burn the winding or even the motor, causing serious consequences.

[0005] Generally speaking, diode failures have minor consequences and can be triggered by an alarm; only severe multi-phase open circuits trigger a trip. However, armature winding failures have serious consequences, requiring rapid and reliable shutdown even for non-metallic faults. Therefore, it's necessary to identify both types of faults and employ different handling methods depending on the specific fault. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a method for identifying armature winding short circuit and diode phase failure of a brushless exciter in response to the defects of the prior art.

[0007] The technical solution adopted by the present invention to solve the technical problem is to construct a method for identifying armature winding short circuit and diode phase failure of a brushless exciter, comprising the following steps:

[0008] Obtain the excitation current of the stator excitation winding of the brushless exciter;

[0009] Preprocessing the excitation current to obtain a preprocessed current;

[0010] An armature winding short circuit fault and a diode phase failure fault of the brushless exciter are identified according to the preprocessed current.

[0011] In the method for identifying armature winding short circuit and diode phase failure of a brushless exciter according to the present invention, obtaining the excitation current of the stator excitation winding of the brushless exciter includes:

[0012] The excitation current in the stator excitation winding is sampled at the brushless exciter end to obtain a sampled current; the sampled current is the excitation current.

[0013] In the method for identifying armature winding short circuit and diode phase failure of a brushless exciter of the present invention, the pre-processed current includes: the effective value of the fundamental wave and the effective value of the fifth harmonic of the excitation current.

[0014] In the method for identifying armature winding short circuit and diode phase failure of a brushless exciter according to the present invention, preprocessing the excitation current to obtain the preprocessed current includes:

[0015] Performing Fourier analysis and calculation on the excitation current to obtain the effective value of the fundamental wave of the excitation current and the effective value of the fifth harmonic of the excitation current.

[0016] In the method for identifying armature winding short circuit and diode phase failure faults of a brushless exciter according to the present invention, identifying the armature winding short circuit fault and diode phase failure fault of the brushless exciter according to the preprocessed current includes:

[0017] The effective value of the fundamental wave is divided by the effective value of the fifth harmonic to obtain a determination coefficient; the determination coefficient is the ratio of the effective value of the fundamental wave to the effective value of the fifth harmonic;

[0018] The armature winding short circuit fault and the diode phase failure fault of the brushless exciter are identified according to the judgment coefficient.

[0019] In the method for identifying armature winding short circuit and diode phase failure faults of a brushless exciter according to the present invention, identifying the armature winding short circuit fault and diode phase failure fault of the brushless exciter according to the judgment coefficient includes:

[0020] comparing the judgment coefficient with a reference value;

[0021] Obtaining a comparison result between the judgment coefficient and the reference value;

[0022] Obtaining a change trend of the effective value of the fundamental wave within a preset time period;

[0023] The armature winding short circuit fault and the diode phase failure fault of the brushless exciter are identified according to the comparison result and the change trend within the preset time period.

[0024] In the method for identifying armature winding short circuit and diode phase failure faults of a brushless exciter according to the present invention, identifying the armature winding short circuit fault and diode phase failure fault of the brushless exciter according to the comparison result and the change trend within the preset time period includes:

[0025] If the comparison result is that the judgment coefficient is greater than or equal to the reference value, then:

[0026] Determining whether the change trend within the preset time period is a continuous decrease;

[0027] If so, it is determined that the fault of the brushless exciter is an armature winding short circuit fault.

[0028] In the method for identifying armature winding short circuit and diode phase failure faults of a brushless exciter according to the present invention, identifying the armature winding short circuit fault and diode phase failure fault of the brushless exciter according to the comparison result and the change trend within the preset time period includes:

[0029] If the comparison result is that the judgment coefficient is smaller than the reference value, it is determined that the fault of the brushless exciter is a diode phase failure.

[0030] In the method for identifying armature winding short circuit and diode phase failure of a brushless exciter described in the present invention, the preset time period is 0.1s.

[0031] In the method for identifying armature winding short circuit and diode phase failure faults of a brushless exciter according to the present invention, after the step of identifying the armature winding short circuit fault and diode phase failure fault of the brushless exciter according to the preprocessed current, the method further comprises:

[0032] Output a fault protection control signal according to the identification result.

[0033] In the method for identifying armature winding short circuit and diode phase failure fault of the brushless exciter of the present invention, the fault protection control signal includes: a diode fault alarm signal or an armature winding fault shutdown control signal;

[0034] Outputting a fault protection control signal according to the identification result includes:

[0035] If the identification result is an armature winding short-circuit fault, outputting the armature winding fault shutdown control signal;

[0036] If the identification result is a diode phase failure, the diode failure alarm signal is output.

[0037] The present invention also provides a device for identifying armature winding short circuit and diode phase failure of a brushless exciter, comprising:

[0038] An acquisition unit, used for acquiring the excitation current of the stator excitation winding of the brushless exciter;

[0039] a preprocessing unit, configured to preprocess the excitation current to obtain a preprocessed current;

[0040] An identification unit is used to identify the armature winding short circuit fault and the diode phase failure fault of the brushless exciter according to the preprocessed current.

[0041] In the device for identifying armature winding short circuit and diode phase failure of a brushless exciter according to the present invention, the acquisition unit includes:

[0042] A sampling module is used to sample the excitation current in the stator excitation winding at the brushless exciter end to obtain a sampled current; the sampled current is the excitation current.

[0043] The present invention also provides a brushless exciter, comprising:

[0044] Memory, used to store programs;

[0045] The processor is used to load the program to execute the method for identifying the armature winding short circuit and diode phase failure of the brushless exciter as described above.

[0046] The present invention also provides a storage medium storing a computer program, which, when executed by a processor, implements the method for identifying armature winding short circuit and diode phase failure of a brushless exciter as described above.

[0047] The present invention provides a method for identifying armature winding short-circuit and diode phase failure faults in a brushless exciter, comprising the following steps: obtaining the excitation current of the stator excitation winding of the brushless exciter; preprocessing the excitation current to obtain a preprocessed current; and identifying armature winding short-circuit and diode phase failure faults in the brushless exciter based on the preprocessed current. The present invention accurately identifies whether a brushless exciter fault is an armature winding short-circuit or a diode phase failure, and then implements appropriate control based on the identification result. This method avoids serious consequences caused by misjudgment, improves unit safety, prevents excitation system shutdown caused by misjudgment, and effectively enhances reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0049] Figure 1 1 is a flow chart of a method for identifying armature winding short circuit and diode phase failure of a brushless exciter provided by an embodiment of the present invention;

[0050] Figure 2 The present invention provides a block diagram of the principle of a device for identifying armature winding short circuit and diode phase failure of a brushless exciter. DETAILED DESCRIPTION

[0051] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0052] refer to Figure 1 , Figure 1 This is a flow chart of an optional embodiment of a method for identifying armature winding short circuit and diode phase failure of a brushless exciter provided by the present invention.

[0053] like Figure 1 As shown, the method for identifying the armature winding short circuit and diode phase failure of the brushless exciter includes the following steps:

[0054] Step S101: Acquire the excitation current of the stator excitation winding of the brushless exciter.

[0055] Optionally, in an embodiment of the present invention, obtaining the excitation current of the stator excitation winding of the brushless exciter includes: sampling the excitation current in the stator excitation winding at the brushless exciter end to obtain the sampled current; the sampled current is the excitation current.

[0056] Step S102: pre-process the excitation current to obtain a pre-processed current.

[0057] The pre-processed current includes: the effective value of the fundamental wave and the effective value of the fifth harmonic of the excitation current.

[0058] Optionally, in an embodiment of the present invention, preprocessing the excitation current to obtain the preprocessed current includes: performing Fourier analysis and calculation on the excitation current to obtain the effective value of the fundamental wave of the excitation current and the effective value of the fifth harmonic of the excitation current.

[0059] Specifically, the excitation current in the stator excitation winding is sampled at the brushless exciter end, and after obtaining the sampled current (i.e., the excitation current), Fourier analysis is performed on the sampled excitation current to obtain the effective value of the fundamental wave and the effective value of the fifth harmonic of the excitation current.

[0060] Step S103: Identify the armature winding short circuit fault and diode phase failure fault of the brushless exciter according to the preprocessed current.

[0061] Optionally, in some embodiments, identifying the armature winding short-circuit fault and the diode phase failure fault of the brushless exciter based on the preprocessed current includes: taking the effective value of the fundamental wave and the effective value of the fifth harmonic as the quotient to obtain a judgment coefficient; the judgment coefficient is the ratio of the effective value of the fundamental wave to the effective value of the fifth harmonic; and identifying the armature winding short-circuit fault and the diode phase failure fault of the brushless exciter based on the judgment coefficient.

[0062] Optionally, in some embodiments, identifying the armature winding short-circuit fault and the diode phase failure fault of the brushless exciter based on the judgment coefficient includes: comparing the judgment coefficient with a reference value; obtaining a comparison result of the judgment coefficient and the reference value; obtaining a change trend of the effective value of the fundamental wave within a preset time period; and identifying the armature winding short-circuit fault and the diode phase failure fault of the brushless exciter based on the comparison result and the change trend within the preset time period.

[0063] Optionally, in some embodiments, the armature winding short-circuit fault and diode phase failure fault of the brushless exciter are identified based on the comparison result and the change trend within a preset time period, including: if the comparison result is that the judgment coefficient is greater than or equal to the reference value, then: determine whether the change trend within the preset time period is continuously decreasing; if so, determine that the fault of the brushless exciter is an armature winding short-circuit fault.

[0064] Furthermore, the armature winding short circuit fault and diode phase failure fault of the brushless exciter are identified based on the comparison result and the change trend within a preset time period, including: if the comparison result is that the judgment coefficient is less than the reference value, then the fault of the brushless exciter is judged to be a diode phase failure fault.

[0065] Optionally, in an embodiment of the present invention, the preset time period is 0.1s.

[0066] Specifically, let the reference value be: ζ; the effective value of the fundamental wave be I (1) , the effective value of the 5th harmonic is I (5) , then the judgment coefficient can be expressed as:

[0067] R=I (1) / I (5) .

[0068] Therefore, after calculating the R value, compare R with ζ; if R ≥ ζ, and I (1) If it decreases continuously within 0.1s, it is judged that the brushless exciter has a rotating armature winding short-circuit fault. Otherwise, it is judged that the brushless exciter has a rotating diode open-circuit fault (i.e., a phase failure).

[0069] Therefore, in the embodiment of the present invention, the method for identifying armature winding short circuit and diode phase failure fault of the brushless exciter can quickly and effectively distinguish armature winding short circuit fault or diode phase failure fault (for example, it can quickly distinguish between non-metallic armature winding short circuit fault and diode phase failure fault) by utilizing the effective value of the fundamental wave and the effective value of the 5th harmonic of the brushless exciter, thereby effectively avoiding serious consequences caused by misjudging the non-metallic armature winding short circuit fault as a diode phase failure fault, and can quickly identify the non-metallic armature winding short circuit fault to achieve a fast and reliable shutdown action, avoiding serious consequences, improving the safety and reliability of the brushless exciter, and also avoiding emergency repairs due to misjudgment of the diode, thereby improving efficiency and reducing costs.

[0070] Specifically, using an actual 39-phase brushless exciter as an example, a finite element simulation model of the exciter was used to calculate the potential for a sudden rotating armature winding short-circuit fault during normal operation. Because the fundamental wave and odd harmonics only appear during transient fault conditions and vary with the moment of fault occurrence, for a more comprehensive analysis, the present invention analyzed 15 fault moments occurring within a cycle, as shown in Table 1 below.

[0071]

[0072] Table 1: Analysis of the stator excitation current when the rotating armature winding of a real 39-phase brushless exciter is short-circuited

[0073] It can be seen from Table 1 that for faults occurring at different times, the ratio of the fundamental wave to the fifth harmonic in the stator excitation current is different, among which the minimum is 6.82 and the maximum is 54.78.

[0074] When a diode open-circuit fault occurs in the brushless exciter, a two-phase open-circuit fault occurs, and a two-phase open-circuit fault occurs, the effective values ​​of the harmonics of the excitation current of the brushless exciter are shown in Tables 2 to 4 respectively.

[0075]

[0076] Table 2: Harmonic analysis of stator excitation current when one rotating diode is open circuit

[0077]

[0078] Table 3: Stator excitation current harmonic analysis when one phase of the rotating diode is open circuit

[0079]

[0080] Table 4: Stator excitation current harmonic analysis when two phases of rotating diode are open circuit

[0081] Tables 2-4 show that regardless of the diode fault, the ratio of the fundamental to the fifth harmonic in the stator excitation current of the exciter does not exceed 1. At this time, the content of odd harmonics is very small for single-phase and two-phase open-circuit faults, while normal operation can also produce certain odd harmonics due to manufacturing variations. Therefore, to prevent misjudgment, the present invention also determines the change in the fundamental component over a continuous 0.1s period. When the rotating armature winding is short-circuited, the odd harmonics in the transient process continuously decrease, while diodes do not have this characteristic. Therefore, by determining the ratio of the effective values ​​of the fundamental to the fifth harmonic in the stator excitation current and simultaneously determining whether the fundamental decreases continuously over a continuous 0.1s period, if so, the brushless exciter armature winding short-circuit fault can be identified; otherwise, it is a brushless exciter diode open-phase fault. Furthermore, the present invention's determination method is highly effective and reliable.

[0082] Furthermore, in some embodiments, the method for identifying the armature winding short circuit and diode phase failure fault of the brushless exciter includes, after the step of identifying the armature winding short circuit fault and diode phase failure fault of the brushless exciter based on the preprocessed current, outputting a fault protection control signal based on the identification result.

[0083] Optionally, in an embodiment of the present invention, the fault protection control signal includes: a diode fault alarm signal or an armature winding fault shutdown control signal.

[0084] In some embodiments, outputting a fault protection control signal according to the identification result includes: outputting an armature winding fault shutdown control signal if the identification result is an armature winding short circuit fault; and outputting a diode fault alarm signal if the identification result is a diode open phase fault.

[0085] Specifically, when the fault of the brushless exciter is identified as an armature winding short-circuit fault, an armature winding fault shutdown control signal is output to control a rapid shutdown to avoid serious consequences; when the fault of the brushless exciter is identified as a diode phase failure fault, a diode fault alarm signal is output to remind relevant personnel to make corresponding improvements or maintenance measures in advance.

[0086] refer to Figure 2 , which is a principle block diagram of an optional embodiment of the device for identifying armature winding short circuit and diode phase failure of a brushless exciter provided by the present invention.

[0087] Among them, the device for identifying the armature winding short circuit and diode phase failure fault of the brushless exciter can distinguish the faults through the method for identifying the armature winding short circuit and diode phase failure fault of the brushless exciter disclosed in the embodiment of the present invention.

[0088] Specifically, such as Figure 2 As shown, the device for identifying armature winding short circuit and diode phase failure of the brushless exciter includes:

[0089] The acquisition unit 201 is used to obtain the excitation current of the stator excitation winding of the brushless exciter:

[0090] The preprocessing unit 202 is used to preprocess the excitation current to obtain a preprocessed current:

[0091] The identification unit 203 is used to identify the armature winding short circuit fault and the diode phase failure fault of the brushless exciter according to the preprocessed current.

[0092] In some embodiments, the acquisition unit 201 includes: a sampling module, the sampling module is used to sample the excitation current in the stator excitation winding at the brushless exciter end to obtain the sampled current; the sampled current is the excitation current.

[0093] The present invention also provides a brushless exciter, comprising:

[0094] Memory, used to store programs.

[0095] The processor is used to load a program to execute the method for identifying armature winding short circuit and diode phase failure of a brushless exciter as disclosed in the embodiment of the present invention.

[0096] The present invention also provides a storage medium storing a computer program, which, when executed by a processor, implements the method for identifying armature winding short circuit and diode phase failure of a brushless exciter as disclosed in an embodiment of the present invention.

[0097] The present invention only needs to collect the stator excitation current in the stator excitation winding from the brushless exciter end. By analyzing the ratio of the fundamental wave and the fifth harmonic and the fundamental wave change trend, it can effectively distinguish between the rotating armature winding short-circuit fault and the rotating diode phase failure fault, effectively improving the safety and reliability of the nuclear power brushless exciter.

[0098] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method description.

[0099] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the above description has generally described the components and steps of each example according to their functions. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present invention.

[0100] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0101] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those skilled in the art to understand the present invention and implement it accordingly. They are not intended to limit the scope of protection of the present invention. All equivalent variations and modifications within the scope of the claims of the present invention are intended to be covered by the claims of the present invention.

Claims

1. A method for identifying armature winding short circuit and diode phase failure faults of a brushless exciter, characterized in that: The following steps are involved: Obtain the excitation current of the stator excitation winding of the brushless exciter; Preprocessing the excitation current to obtain a preprocessed current; The pre-processed current includes: the effective value of the fundamental wave and the effective value of the fifth harmonic of the excitation current; Identifying an armature winding short circuit fault and a diode open phase fault of the brushless exciter according to the preprocessed current; The identifying of the armature winding short circuit fault and the diode open phase fault of the brushless exciter according to the preprocessed current includes: The effective value of the fundamental wave is divided by the effective value of the fifth harmonic to obtain a determination coefficient; the determination coefficient is the ratio of the effective value of the fundamental wave to the effective value of the fifth harmonic; Identifying an armature winding short-circuit fault and a diode phase failure fault of the brushless exciter according to the judgment coefficient; The identifying of the armature winding short circuit fault and the diode phase failure fault of the brushless exciter according to the judgment coefficient includes: comparing the judgment coefficient with a reference value; Obtaining a comparison result between the judgment coefficient and the reference value; Obtaining a change trend of the effective value of the fundamental wave within a preset time period; The armature winding short circuit fault and the diode phase failure fault of the brushless exciter are identified according to the comparison result and the change trend within the preset time period.

2. The method for identifying armature winding short circuit and diode phase failure of a brushless exciter according to claim 1, characterized in that: The step of obtaining the excitation current of the stator excitation winding of the brushless exciter comprises: The excitation current in the stator excitation winding is sampled at the brushless exciter end to obtain a sampled current; the sampled current is the excitation current.

3. The method for identifying armature winding short circuit and diode phase failure of a brushless exciter according to claim 2, characterized in that: The preprocessing of the excitation current to obtain the preprocessed current includes: Performing Fourier analysis and calculation on the excitation current to obtain the effective value of the fundamental wave of the excitation current and the effective value of the fifth harmonic of the excitation current.

4. The method for identifying armature winding short circuit and diode phase failure of a brushless exciter according to claim 1, characterized in that: The identifying of the armature winding short circuit fault and the diode phase failure fault of the brushless exciter according to the comparison result and the change trend within the preset time period includes: If the comparison result is that the judgment coefficient is greater than or equal to the reference value, then: Determining whether the change trend within the preset time period is a continuous decrease; If so, it is determined that the fault of the brushless exciter is an armature winding short circuit fault.

5. The method for identifying armature winding short circuit and diode phase failure of a brushless exciter according to claim 4, characterized in that: The identifying of the armature winding short circuit fault and the diode phase failure fault of the brushless exciter according to the comparison result and the change trend within the preset time period includes: If the comparison result is that the judgment coefficient is smaller than the reference value, it is determined that the fault of the brushless exciter is a diode phase failure.

6. The method for identifying armature winding short circuit and diode phase failure of a brushless exciter according to claim 5, characterized in that: The preset time period is 0.1s.

7. The method for identifying armature winding short circuit and diode phase failure of a brushless exciter according to any one of claims 1 to 6, characterized in that: After the step of identifying the armature winding short circuit fault and the diode open phase fault of the brushless exciter according to the preprocessing current, the method further comprises: Output a fault protection control signal according to the identification result.

8. The method for identifying armature winding short circuit and diode phase failure of a brushless exciter according to claim 7, characterized in that: The fault protection control signal includes: a diode fault alarm signal or an armature winding fault shutdown control signal; Outputting a fault protection control signal according to the identification result includes: If the identification result is an armature winding short-circuit fault, outputting the armature winding fault shutdown control signal; If the identification result is a diode phase failure, the diode failure alarm signal is output.

9. A device for identifying armature winding short circuit and diode phase failure of a brushless exciter, characterized in that: include: An acquisition unit, used for acquiring the excitation current of the stator excitation winding of the brushless exciter; a preprocessing unit, configured to preprocess the excitation current to obtain a preprocessed current; The pre-processed current includes: the effective value of the fundamental wave and the effective value of the fifth harmonic of the excitation current; an identification unit, configured to identify an armature winding short-circuit fault and a diode phase failure fault of the brushless exciter according to the preprocessed current; The identifying of the armature winding short circuit fault and the diode open phase fault of the brushless exciter according to the preprocessed current includes: The effective value of the fundamental wave is divided by the effective value of the fifth harmonic to obtain a determination coefficient; the determination coefficient is the ratio of the effective value of the fundamental wave to the effective value of the fifth harmonic; Identifying an armature winding short-circuit fault and a diode phase failure fault of the brushless exciter according to the judgment coefficient; The identifying of the armature winding short circuit fault and the diode phase failure fault of the brushless exciter according to the judgment coefficient includes: comparing the judgment coefficient with a reference value; Obtaining a comparison result between the judgment coefficient and the reference value; Obtaining a change trend of the effective value of the fundamental wave within a preset time period; The armature winding short circuit fault and the diode phase failure fault of the brushless exciter are identified according to the comparison result and the change trend within the preset time period.

10. The device for identifying armature winding short circuit and diode phase failure of a brushless exciter according to claim 9, characterized in that: The acquisition unit includes: A sampling module is used to sample the excitation current in the stator excitation winding at the brushless exciter end to obtain a sampled current; the sampled current is the excitation current.

11. A brushless exciter, characterized in that: include: Memory, used to store programs; A processor is used to load the program to execute the method for identifying armature winding short circuit and diode phase failure of a brushless exciter according to any one of claims 1 to 8.

12. A storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method for identifying armature winding short circuit and diode phase failure of a brushless exciter as described in any one of claims 1 to 8 is implemented.

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