CN111650510A - Fault judgment method and device for brushless excitation motor, computer equipment and medium - Google Patents

Fault judgment method and device for brushless excitation motor, computer equipment and medium Download PDF

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CN111650510A
CN111650510A CN202010396962.9A CN202010396962A CN111650510A CN 111650510 A CN111650510 A CN 111650510A CN 202010396962 A CN202010396962 A CN 202010396962A CN 111650510 A CN111650510 A CN 111650510A
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effective value
positive
fault
brushless
stator
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CN111650510B (en
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潘国传
郝亮亮
陈新琪
顾范华
章良健
陶开华
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Taizhou Power Plant Of Zhejiang Zheneng Electric Power Co ltd
Beijing Jiaotong University
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Taizhou Power Plant Of Zhejiang Zheneng Electric Power Co ltd
Beijing Jiaotong University
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/34—Testing dynamo-electric machines
    • G01R31/346—Testing of armature or field windings
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/34—Testing dynamo-electric machines
    • G01R31/343—Testing dynamo-electric machines in operation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/52—Testing for short-circuits, leakage current or ground faults

Abstract

The invention discloses a fault judgment method, a fault judgment device, computer equipment and a medium of a brushless excitation motor, wherein the method comprises the following steps: acquiring voltage data of the two ends of a positive pole and a negative pole of a stator excitation winding of a brushless excitation motor to ground; fourier analysis is carried out on the voltage data, and a positive effective value U under preset harmonic frequency is calculated+And negative effective value U‑(ii) a Based on the positive effective value U+And the negative pole effective value U‑And judging whether the grounding part of the stator exciting winding of the brushless exciting motor has a fault or not. According to the embodiment of the invention, the positive pole effective value U under the preset harmonic frequency is determined by performing Fourier analysis on the voltage to earth data at the positive and negative poles+And negative effective value U‑And judging whether the grounding position of the stator exciting winding has a fault or not based on the two effective values. The embodiment of the invention has the characteristics of simple operation and intuitive judgment,the safety of the brushless excitation motor is ensured.

Description

Fault judgment method and device for brushless excitation motor, computer equipment and medium
Technical Field
The invention relates to the technical field of relay protection of main equipment of a power system. And more particularly, to a method, an apparatus, a computer device, and a medium for determining a fault of a brushless excitation motor.
Background
The excitation system is an important component of a large-scale generator, and the excitation system with excellent performance and high reliability is the basis for ensuring the safety of the generator and the stable operation of a power system. Compared with static excitation, the brushless excitation system cancels a carbon brush and a slip ring of a generator, remarkably improves the reliability of the excitation system, and is a preferred excitation mode of a high-capacity nuclear power unit.
Taking an 11-phase annular brushless excitation motor commonly used in a power plant as an example, a stator winding of the 11-phase annular brushless excitation motor often has two-point ground faults, so that serious potential safety hazards are brought to the operation of unit equipment, and the power production is greatly influenced.
However, in the prior art, no corresponding fault judgment mode is set for the two-point grounding of the stator excitation winding of the brushless excitation motor, and no relevant research for short-circuit fault protection of the excitation winding is found in the currently published data. The related regulation standard does not provide a clear method for judging the internal faults of the stator and rotor windings of the brushless excitation motor.
Therefore, it is necessary to provide a new method, apparatus, computer device, and medium for determining a fault of a brushless excitation motor.
Disclosure of Invention
The invention aims to provide a fault judgment method, a fault judgment device, computer equipment and a medium of a brushless excitation motor, which are used for solving at least one of the problems in the prior art;
in order to achieve the purpose, the invention adopts the following technical scheme:
the first aspect of the present invention provides a method for determining a fault of a brushless excitation motor, including:
acquiring voltage data of the two ends of a positive pole and a negative pole of a stator excitation winding of a brushless excitation motor to ground;
fourier analysis is carried out on the voltage data, and a positive effective value U under preset harmonic frequency is calculated+And negative effective value U-；
Based on the positive effective value U+And the negative pole effective value U-And judging whether the grounding part of the stator exciting winding of the brushless exciting motor has a fault or not.
Optionally, the positive effective value U is used as the basis+And the negative pole effective value U-Judging whether the stator exciting winding grounding part of the brushless exciting motor has a fault or not comprises the following steps:
based on the positive effective value U+And the negative pole effective value U-Determining a total effective value U;
setting a voltage data threshold xi to earth under a preset harmonic frequency;
and comparing the total effective value U with the voltage data threshold value xi, and judging whether the grounding part of the stator exciting winding of the brushless exciting motor has a fault or not when U is more than or equal to xi.
Optionally, the brushless excitation motor is an 11-phase brushless excitation motor, and the preset harmonic frequency is 550 Hz.
Optionally, the total effective value U is the positive effective value U+And the negative pole effective value U-And (4) summing.
Optionally, the voltage to ground data threshold ξ is the sum of the positive and negative voltage to ground harmonics at a preset harmonic frequency.
A second aspect of the present invention provides a failure determination apparatus for the method, including:
the voltage data acquisition unit is used for acquiring voltage data of the positive and negative poles of the excitation winding of the brushless excitation motor stator to the ground;
an analysis and calculation unit for analyzing the electricityFourier analysis is carried out on the pressure data, and the positive pole effective value U under the preset harmonic frequency is calculated+And negative effective value U-；
A fault determination unit for determining a fault based on the positive effective value U+And the negative pole effective value U-And judging whether the grounding part of the stator exciting winding of the brushless exciting motor has a fault or not.
A third aspect of the invention provides a computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the above method when executing the program.
A fourth aspect of the invention provides a computer-readable storage medium, on which a computer program is stored, characterized in that the program, when executed by a processor, implements the above-mentioned method.
The invention has the following beneficial effects:
according to the embodiment of the invention, the positive pole effective value U under the preset harmonic frequency is determined by performing Fourier analysis on the voltage to earth data at the positive and negative poles+And negative effective value U-And judging whether the grounding position of the stator exciting winding has a fault or not based on the two effective values. The embodiment of the invention has the characteristics of simple operation and intuitive judgment, and ensures the safety of the brushless excitation motor.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 illustrates a flow diagram of a determination method of one embodiment of the invention;
FIG. 2 is a flow chart of a determination method according to another embodiment of the present invention;
figure 3 shows a schematic diagram of the stator coordinates of a brushless excitation motor of an embodiment of the invention;
fig. 4 is a schematic diagram illustrating an analysis process of harmonic current characteristics of stator exciting current when two points of a stator of a brushless exciting motor are grounded according to an embodiment of the present invention;
fig. 5 shows a block diagram of a computer apparatus of an embodiment of the present invention.
Detailed Description
In order to more clearly illustrate the invention, the invention is further described below with reference to preferred embodiments and the accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
As shown in fig. 1, an embodiment of the present invention discloses a method for determining a fault of a brushless excitation motor, which specifically includes:
s1, acquiring voltage data of the two ends of the positive pole and the negative pole of the stator excitation winding of the brushless excitation motor to ground;
s2, carrying out Fourier analysis on the voltage data, and calculating a positive effective value U under a preset harmonic frequency+And negative effective value U-；
S3, based on the positive effective value U+And the negative pole effective value U-And judging whether the grounding part of the stator exciting winding of the brushless exciting motor has a fault or not.
According to the embodiment of the invention, the positive pole effective value U under the preset harmonic frequency is determined by performing Fourier analysis on the voltage to earth data at the positive and negative poles+And negative effective value U-And judging whether the stator excitation winding ground is in fault or not based on the two effective values. The embodiment of the invention has the characteristics of simple operation and intuitive judgment, and ensures the safety of the brushless excitation motor.
In a specific example, the voltage-to-ground data in the present embodiment may be acquired using a voltage transformer or a hall element;
in some optional implementations of this embodiment, S3 further includes:
s31, based on the positive effective value U+And the negative pole effective value U-Determining a total effective value U;
s32, setting a voltage data threshold xi to ground under a preset harmonic frequency;
and S33, comparing the total effective value U with the voltage data threshold xi, and judging whether the grounding position of the stator exciting winding of the brushless exciting motor has a fault when U is larger than or equal to xi.
In some optional implementations of this embodiment, the brushless excitation motor is an 11-phase brushless excitation motor, and the preset harmonic frequency is 550 Hz.
In some optional implementations of this embodiment, the total effective value U is the positive effective value U+And the negative pole effective value U-And (4) summing.
In some optional implementations of this embodiment, the voltage-to-ground data threshold ξ is a sum of positive and negative pole voltage-to-ground harmonics at a preset harmonic frequency.
In an alternative embodiment of the invention, the failure occurrence is set as: when the total effective value U is larger than a voltage data threshold value xi under the preset harmonic frequency, namely when U is larger than or equal to xi, judging that the brushless excitation motor has a stator two-point ground fault; and xi is a preset threshold value of the sum of the 550Hz positive and negative ground harmonic voltages, and the threshold value can reliably avoid the sum of the 550Hz positive and negative ground harmonic voltages under various working conditions in normal operation.
Fig. 2 shows a method for determining a fault of a brushless exciter according to another embodiment of the present invention, which takes an 11-phase brushless exciter as an example, and is performed in a computer sequentially according to the following steps:
measuring the voltages to earth of the positive and negative ends of a stator winding of the 11-phase brushless exciter, and sending sampling data to a computer;
step (2), Fourier analysis is carried out on the sampled positive and negative voltage to earth data, 550Hz harmonic waves are taken, and the effective values are respectively calculated to be U+And U-；
And (3) solving that the sum of the effective values of the two is U:
U＝U++U-；
step (4), fault judgment:
when U is larger than or equal to xi, judging that the 11-phase brushless exciter has stator two-point grounding fault; where ξ is a preset threshold of the sum of the positive and negative 550Hz harmonic voltages to ground.
In the embodiment, when the 11-phase brushless exciter has a stator two-point grounding fault, large 550Hz high-frequency harmonic voltage to the ground appears on the positive and negative poles of the stator winding, the harmonic voltage is the embodiment of the high-frequency internal potential of the exciter stator winding caused by the armature reaction magnetic field during the fault, and the potential acts on the harmonic component of the exciting current during the fault formation of the large inductance of the exciting winding. Therefore, in the embodiment of the invention, by utilizing the characteristic of the 11-phase brushless exciter when the two-point ground fault of the stator occurs, only the voltage data of the positive and negative ends of the stator excitation winding to the ground voltage is acquired from the brushless excitation motor end, and the voltage data is subjected to Fourier analysis to obtain the positive effective value U under the preset harmonic frequency+And negative effective value U-The method can realize simple and effective judgment of the stator two-point earth fault, and is more sensitive than a scheme based on excitation current detection.
The principle of the invention is as follows, and still takes an 11-phase annular brushless excitation motor as an example:
as shown in fig. 3, assuming that the w turns of field winding under the 1 st pole are shorted to the ground, when the w turns of field winding pass through the dc current I, a rectangular wave magnetic potential is generated, and the rectangular wave magnetic potential f (x) is obtained by performing harmonic analysis on the rectangular wave magnetic potential in the entire circumference [ -5 pi, 5 pi ] interval of the motor:
Figure BDA0002487980780000041
since the rectangular wave magnetomotive force is axisymmetrical to the rotor coordinate d, only the cosine term is present in the above formula. In the formula:
Figure BDA0002487980780000042
in the formula, FkMagnetomotive force being a k-th harmonicβ is the field coil short pitch ratio, and since the field coil of a salient pole machine can be regarded as a concentrated full pitch coil, β is 1.
Thus:
Figure BDA0002487980780000043
as can be seen from the above formula, when k is an even number, FkEqual to zero. Therefore, the magnetomotive force generated by the excitation fault additional circuit does not contain even harmonics, and contains fundamental waves, odd harmonics, and fractional harmonics such as 1/5 and 2/5. These magnetomotive forces acting on the uneven air gap will generate a series of harmonic magnetic fields, taking k ═ v/5 (ν ═ 1,2 …) times of magnetomotive force as an example:
B(x)＝Fk(x)·λ(x) (4)
unlike a non-salient pole generator, the air gap permeability coefficient without considering the influence of teeth and grooves is as follows:
Figure BDA0002487980780000051
thus:
Figure BDA0002487980780000052
from the above formula, the excitation fault additional loop direct current component current generates a magnetic field containing fundamental wave, odd-order and fractional harmonic. Wherein, contains lambda0The term (b) represents a space magnetic field of the same order as the excitation magnetomotive force, and the air-gap magnetic field also contains (v/5 ± 2l) harmonics (l ═ 0,1,2 …) due to the influence of the air-gap permeance harmonics, and these magnetic fields all rotate synchronously with the rotor.
When the two points of the stator are in ground fault, fractional electromotive force in the armature winding is superposed into fundamental wave and odd electromotive force in normal operation, and the phase change mode of the load rotation rectifier is changed. But regardless of the change in the commutation pattern of the rotating commutator, because each fractional electromotive force will each cause a harmonic current of the corresponding frequency in the armature phase current.
μ of the k-th phase armature winding1The/5 th harmonic current can be expressed as:
Figure BDA0002487980780000053
in the formula: mu.s1N is a constant; t is time;
harmonic current generates each harmonic magnetomotive force, and Fourier decomposition is carried out on the space magnetomotive force generated by the winding of one phase, and the number of the harmonic magnetomotive force is v1μ of/5, k-th phase armature winding1V generated by/5 th harmonic current1The/5 th order spatial harmonic magnetic potential can be expressed as:
Figure BDA0002487980780000054
the magnetic potential expression generated by the k-th phase winding is obtained as
Figure BDA0002487980780000055
In the formula (I); alpha is an electrical angle;
the magnetic potential generated by each phase winding is pulse vibration magnetic potential which can be decomposed into positive and reverse magnetic potential, and the magnetic potential with the same direction of rotation is respectively synthesized. The positive and reverse magnetic potentials are respectively:
Figure BDA0002487980780000061
Figure BDA0002487980780000062
by further mathematical derivation (a complicated process is omitted), the magnitudes of the positive and reverse magnetic potentials can be expressed as:
Figure BDA0002487980780000063
Figure BDA0002487980780000064
from the formulae (12) and (13): if and only if v1＝11n2+μ1(n2∈ N) time fv∑Is not zero, only 11n exists in armature reaction2+μ1The next positive rotational component. Similarly, if and only if v1＝11n2-μ1(n2∈ N) time fv∑Is not zero, only 11n exists in armature reaction2-μ1The sub-inversion component.
The analysis process of the harmonic current characteristics of the stator exciting current when the two points of the stator are in ground fault is shown in fig. 4. Mu in armature winding1V generated by 11 subharmonic current1A/11 th harmonic magnetomotive force, the number of pole pairs is v1[ mu ] of a synchronous rotational speed which is a forward rotation component of1/v1Multiple, relative stator speed of rotation | mu1/v11 times, the electromotive force induced in the stator at a frequency of | μ of the fundamental wave1-v1I.e., 550 times the subharmonic potential, |/11 times.
Through the calculation and analysis, the specific harmonic of the voltage to ground of the stator winding can reflect the two-point ground fault of the excitation winding of the stator of the exciter, and the embodiment of the invention utilizes the characteristic to determine the positive pole effective value U under the preset harmonic frequency by carrying out Fourier analysis on the voltage to ground data of the positive pole and the negative pole+And negative effective value U-And judging whether the stator excitation winding ground is in fault or not based on the two effective values. The embodiment of the invention has the characteristics of simple operation and intuitive judgment, and ensures the safety of the brushless excitation motor.
Another embodiment of the present invention discloses a failure determination device of a brushless excitation motor, the device including:
the voltage data acquisition unit is used for acquiring voltage data of the positive and negative poles of the excitation winding of the brushless excitation motor stator to the ground;
an analysis and calculation unit for performing Fourier analysis on the voltage data and calculating a positive effective value U under a preset harmonic frequency+And the negative electrode is effectiveValue U-；
A fault determination unit for determining a fault based on the positive effective value U+And the negative pole effective value U-And judging whether the grounding part of the stator exciting winding of the brushless exciting motor has a fault or not.
It should be noted that the principle and the working flow of the fault determination apparatus for a brushless excitation motor provided in this embodiment are similar to those of the fault determination method based on a brushless excitation motor, and reference may be made to the above description for relevant points, which is not described herein again.
Another embodiment of the present invention provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements: acquiring voltage data of the two ends of a positive pole and a negative pole of a stator excitation winding of a brushless excitation motor to ground; fourier analysis is carried out on the voltage data, and a positive effective value U under preset harmonic frequency is calculated+And negative effective value U-(ii) a Based on the positive effective value U+And the negative pole effective value U-And judging whether the grounding part of the stator exciting winding of the brushless exciting motor has a fault or not. In practice, the computer-readable storage medium may take any combination of one or more computer-readable media. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the present embodiment, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
A computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
Computer program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider).
As shown in fig. 5, another embodiment of the present invention provides a schematic structural diagram of a computer device. The computer device 12 shown in FIG. 5 is only an example and should not bring any limitations to the functionality or scope of use of embodiments of the present invention.
As shown in FIG. 5, computer device 12 is in the form of a general purpose computing device. The components of computer device 12 may include, but are not limited to: one or more processors or processing units 16, a system memory 28, and a bus 18 that couples various system components including the system memory 28 and the processing unit 16.
Bus 18 represents one or more of any of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, and a processor or local bus using any of a variety of bus architectures. By way of example, such architectures include, but are not limited to, Industry Standard Architecture (ISA) bus, micro-channel architecture (MAC) bus, enhanced ISA bus, Video Electronics Standards Association (VESA) local bus, and Peripheral Component Interconnect (PCI) bus.
Computer device 12 typically includes a variety of computer system readable media. Such media may be any available media that is accessible by computer device 12 and includes both volatile and nonvolatile media, removable and non-removable media.
The system memory 28 may include computer system readable media in the form of volatile memory, such as Random Access Memory (RAM)30 and/or cache memory 32. Computer device 12 may further include other removable/non-removable, volatile/nonvolatile computer system storage media. By way of example only, storage system 34 may be used to read from and write to non-removable, nonvolatile magnetic media (not shown in FIG. 5, and commonly referred to as a "hard drive"). Although not shown in FIG. 5, a magnetic disk drive for reading from and writing to a removable, nonvolatile magnetic disk (e.g., a "floppy disk") and an optical disk drive for reading from or writing to a removable, nonvolatile optical disk (e.g., a CD-ROM, DVD-ROM, or other optical media) may be provided. In these cases, each drive may be connected to bus 18 by one or more data media interfaces. Memory 28 may include at least one program product having a set (e.g., at least one) of program modules that are configured to carry out the functions of embodiments of the invention.
A program/utility 40 having a set (at least one) of program modules 42 may be stored, for example, in memory 28, such program modules 42 including, but not limited to, an operating system, one or more application programs, other program modules, and program data, each of which examples or some combination thereof may comprise an implementation of a network environment. Program modules 42 generally carry out the functions and/or methodologies of the described embodiments of the invention.
Computer device 12 may also communicate with one or more external devices 14 (e.g., keyboard, pointing device, display 24, etc.), with one or more devices that enable a user to interact with computer device 12, and/or with any devices (e.g., network card, modem, etc.) that enable computer device 12 to communicate with one or more other computing devices. Such communication may be through an input/output (I/O) interface 22. Also, computer device 12 may communicate with one or more networks (e.g., a Local Area Network (LAN), a Wide Area Network (WAN), and/or a public network such as the Internet) via network adapter 20. As shown in FIG. 5, the network adapter 20 communicates with the other modules of the computer device 12 via the bus 18. It should be appreciated that although not shown in FIG. 5, other hardware and/or software modules may be used in conjunction with computer device 12, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems, among others.
The processor unit 16 executes various functional applications and data processing by executing programs stored in the system memory 28, for example, to implement a method for determining a fault of a brushless excitation motor according to an embodiment of the present invention.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.

Claims (8)

1. A fault judging method of a brushless excitation motor is characterized in that,
acquiring voltage data of the two ends of a positive pole and a negative pole of a stator excitation winding of a brushless excitation motor to ground;
fourier analysis is carried out on the voltage data, and a positive effective value U under preset harmonic frequency is calculated+And negative effective value U-；
Based on the positive effective value U+And the negative pole effective value U-And judging whether the grounding part of the stator exciting winding of the brushless exciting motor has a fault or not.
2. The method of claim 1, wherein the positive root mean square value U is based on+And the negative pole effective value U-Judging whether the stator exciting winding grounding part of the brushless exciting motor has a fault or not comprises the following steps:
based on the positive effective value U+And the negative pole effective value U-Determining a total effective value U;
setting a voltage data threshold xi to earth under a preset harmonic frequency;
and comparing the total effective value U with the voltage data threshold value xi, and judging whether the grounding part of the stator exciting winding of the brushless exciting motor has a fault or not when U is more than or equal to xi.
3. The method of claim 1, wherein the brushless field machine is an 11-phase brushless field machine and the predetermined harmonic frequency is 550 Hz.
4. The method of claim 1, wherein the total effective value U is the positive effective value U+And the negative pole effective value U-And (4) summing.
5. The method of claim 1, wherein the voltage to ground data threshold ξ is the sum of positive and negative voltage to ground harmonics at a preset harmonic frequency.
6. A failure determination apparatus for performing the method of any one of claims 1-5,
the voltage data acquisition unit is used for acquiring voltage data of the positive and negative poles of the excitation winding of the brushless excitation motor stator to the ground;
an analysis and calculation unit for performing Fourier analysis on the voltage data and calculating a positive effective value U under a preset harmonic frequency+And negative effective value U-；
A fault determination unit for determining a fault based on the positive effective value U+And the negative pole effective value U-And judging whether the grounding part of the stator exciting winding of the brushless exciting motor has a fault or not.
7. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the method according to any of claims 1-5 when executing the program.
8. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the method according to any one of claims 1-5.
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