CN116296346A

CN116296346A - Method, device and storage medium for determining mechanical faults of transformer winding

Info

Publication number: CN116296346A
Application number: CN202310547688.4A
Authority: CN
Inventors: 袁耀; 杨家辉; 黎文浩; 赵林杰; 张曦; 鲍连伟; 黄克捷; 朱俊霖; 雷园园
Original assignee: CSG Electric Power Research Institute
Current assignee: CSG Electric Power Research Institute
Priority date: 2023-05-15
Filing date: 2023-05-15
Publication date: 2023-06-23
Anticipated expiration: 2043-05-15
Also published as: CN116296346B

Abstract

The application provides a method, a device and a storage medium for determining mechanical faults of a transformer winding, wherein the method comprises the following steps: acquiring a first short-circuit force; under the condition that a winding of the transformer has a short circuit fault, obtaining a second short circuit force; obtaining a vibration characteristic quantity; determining whether the first short-circuit force meets a first condition, determining whether the second short-circuit force meets a second condition, determining whether the vibration characteristic quantity meets a third condition, and obtaining a determination result, wherein the first condition is that the first short-circuit force is larger than a preset short-circuit force, the second condition is that the second short-circuit force is larger than the preset short-circuit force, and the third condition is that the vibration characteristic quantity is larger than the preset characteristic quantity; and determining whether the winding of the transformer has mechanical failure according to the determination result. The method solves the problem that whether the mechanical fault occurs in the transformer winding cannot be accurately determined by adopting a single vibration monitoring and evaluating method in the prior art.

Description

Method, device and storage medium for determining mechanical faults of transformer winding

Technical Field

The application relates to the technical field of transformers, in particular to a method for determining mechanical faults of a transformer winding, a device for determining the mechanical faults of the transformer winding, a storage medium, a processor and electronic equipment.

Background

The evaluation and diagnosis of the mechanical structure state of the transformer winding usually adopts a vibration monitoring and evaluating method, and the vibration monitoring and evaluating method can realize live detection or online monitoring, but because vibration signals are collected at the wall of the transformer, the vibration signals can be influenced by superposition of iron core vibration signals and electric parameters such as direct current magnetic bias, voltage current harmonic waves and the like, so that the misdiagnosis rate of the mechanical state of the transformer winding is higher when the single vibration monitoring and evaluating method is adopted, and in addition, the single vibration monitoring and evaluating method can not know which side winding (for example, the transformer winding is generally divided into a high-voltage side winding, a medium-voltage side winding and a low-voltage side winding) has abnormality and which type of abnormality is specific.

In the prior art, a single vibration monitoring and evaluating method cannot accurately determine whether a mechanical fault occurs in a transformer winding, and possible fault positions and fault types of the winding cannot be identified.

Disclosure of Invention

The primary purpose of the application is to provide a method for determining mechanical faults of a transformer winding, a device for determining mechanical faults of a transformer winding, a storage medium, a processor and electronic equipment, so as to at least solve the problem that whether the mechanical faults occur in the transformer winding cannot be accurately determined by adopting a single vibration monitoring and evaluating method in the prior art.

To achieve the above object, according to one aspect of the present application, there is provided a method of determining a mechanical failure of a transformer winding, the method comprising: acquiring a first short-circuit force, wherein the first short-circuit force is used for representing electromagnetic force born by a winding of a transformer under the action of rated short-circuit current in the winding of the transformer, and the rated short-circuit current is determined by short-circuit capacity of the winding of the transformer and short-circuit impedance of the winding of the transformer; obtaining a second short-circuit force under the condition that the windings of the transformer have short-circuit faults, wherein the second short-circuit force is used for representing electromagnetic force applied to the windings of the transformer under the action of short-circuit impact current peaks in the windings of the transformer; obtaining a vibration characteristic quantity, wherein the vibration characteristic quantity is used for representing the mechanical state of the winding of the transformer and is determined by a vibration signal of a tank wall of the transformer; determining whether the first short-circuit force meets a first condition, determining whether the second short-circuit force meets a second condition, determining whether the vibration characteristic quantity meets a third condition, and obtaining a determination result, wherein the first condition is that the first short-circuit force is larger than a preset short-circuit force, the second condition is that the second short-circuit force is larger than the preset short-circuit force, and the third condition is that the vibration characteristic quantity is larger than the preset characteristic quantity; and determining whether the winding of the transformer has mechanical failure according to the determination result.

Optionally, determining whether the winding of the transformer has a mechanical failure according to the determination result includes: determining that the mechanical failure occurs to a first extent in the winding of the transformer, in a case where the determination result is a first determination result, the first determination result indicating that the first short-circuit force satisfies the first condition, the second short-circuit force satisfies the second condition, and the vibration feature satisfies the third condition; in the case where the determination result is at least one of a second determination result, a third determination result, and the fourth determination result, it is determined that the mechanical failure of the winding of the transformer occurs to a second degree, the second determination result indicates that the first short-circuit force satisfies the first condition and the second short-circuit force does not satisfy the second condition and the vibration characteristic amount satisfies the third condition, the third determination result indicates that the first short-circuit force satisfies the first condition and the second short-circuit force satisfies the second condition, the vibration characteristic amount does not satisfy the third condition, the fourth determination result indicates that the first short-circuit force does not satisfy the first condition and the second short-circuit force does not satisfy the second condition, and the vibration characteristic amount satisfies the third condition; and determining that the mechanical failure occurs to a third degree in the winding of the transformer in the case where the determination result is a fifth determination result, the fifth determination result indicating that the first short-circuit force satisfies the first condition and the second short-circuit force does not satisfy the second condition, and the vibration feature does not satisfy the third condition, the first degree being greater than the second degree, the second degree being greater than the third degree.

Optionally, the transformer includes a plurality of windings, one corresponding to each phase, the phases including an a phase, a B phase, and a C phase, and determining whether the second shorting force satisfies a second condition includes: acquiring a target phase, and determining a plurality of target windings according to the target phase, wherein the target phase is the phase of the winding with the short-circuit fault, and the target windings are the windings of the target phase; determining whether the second shorting force of each of the target windings satisfies the second condition.

Optionally, the transformer includes a plurality of windings, one of the windings corresponds to one phase, the phase includes an a-phase, a B-phase, and a C-phase, the second shorting force has a plurality of types, the second shorting force of one type corresponds to one fault type, and after determining whether the second shorting force satisfies a second condition, the method further includes: and determining that the mechanical fault of a target fault type occurs in the target winding under the condition that the second short-circuit force of the target winding meets the second condition, wherein the target fault type is the fault type corresponding to the second short-circuit force type of the target winding.

Optionally, one of the windings corresponds to a voltage level, and after determining whether the second shorting force satisfies a second condition, the method further comprises: and uploading the target phase and a target voltage level to a cloud server when the second short-circuit force of the target winding meets the second condition, wherein the target voltage level is the voltage level of the target winding.

Optionally, the vibration feature quantity at least includes a vibration amplitude, a high-low frequency vibration power ratio, a vibration power entropy, a vibration power parity harmonic ratio, a first stable feature value and a second stable feature value, and the obtaining the vibration feature quantity includes: according to

Determining the vibration amplitude, wherein +.>

For the vibration amplitude, +.>

Is the vibration signal; according to

Determining the high-low frequency vibration power ratio, wherein +.>

For said high-low frequency vibration power ratio, < >>

，

，/>

For the power spectrum +.>

Is obtained by performing fourier transform on an autocorrelation function of the vibration signal; according to->

Determining the vibration power entropy, wherein ∈>

For the said entropy of the vibration power,

，/>

，/>

，/>

is a frequency correction coefficient; according to->

Determining a vibration power parity harmonic ratio, wherein +. >

A parity harmonic ratio for the vibration power; according to->

Determining a first stable characteristic value and according to +.>

Determining a second stability characteristic, wherein ∈>

For the first stable characteristic value, +.>

For the second stable characteristic value, +.>

For a first preset value,/o>

For a second preset value,/->

，/>

For the amplitude of the vibration signal at a first preset frequency,/or->

For the amplitude of the load current signal of the transformer at a second preset frequency, +.>

For the rated current of the transformer, +.>

，/>

For the phase angle of the vibration signal at the first preset frequency,/or->

A phase angle at the second preset frequency for the load current signal.

According to another aspect of the present application, there is provided a device for determining a mechanical failure of a transformer winding, the device comprising: a first acquisition unit for acquiring a first short-circuit force for characterizing an electromagnetic force received by a winding of a transformer under the action of a rated short-circuit current in the winding of the transformer, the rated short-circuit current being determined by a short-circuit capacity of the winding of the transformer and a short-circuit impedance of the winding of the transformer; a second obtaining unit, configured to obtain a second short-circuit force when a short-circuit fault occurs in the winding of the transformer, where the second short-circuit force is used to characterize an electromagnetic force received by the winding of the transformer under the action of a short-circuit impact current peak value in the winding of the transformer; a third acquisition unit for acquiring a vibration characteristic quantity, which is used for representing the mechanical state of the winding of the transformer and is determined by a vibration signal of a tank wall of the transformer; a first determining unit, configured to determine whether the first short-circuit force meets a first condition, determine whether the second short-circuit force meets a second condition, and determine whether the vibration feature quantity meets a third condition, to obtain a determination result, where the first condition is that the first short-circuit force is greater than a preset short-circuit force, the second condition is that the second short-circuit force is greater than the preset short-circuit force, and the third condition is that the vibration feature quantity is greater than a preset feature quantity; and the second determining unit is used for determining whether the winding of the transformer has mechanical faults according to the determination result.

According to still another aspect of the present application, there is provided a computer readable storage medium, where the computer readable storage medium includes a stored program, and when the program runs, the device in which the computer readable storage medium is controlled to execute any one of the above-mentioned methods for determining a mechanical fault of a transformer winding.

According to yet another aspect of the present application, a processor is provided, which is configured to run a program, where the program, when run, performs any one of the methods for determining a mechanical failure of a transformer winding.

According to an aspect of the present application, there is provided an electronic device, including: one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs comprising a determination method for performing any one of the transformer winding mechanical faults.

By applying the technical scheme, the first short-circuit force meets the first condition to indicate that the congenital short-circuit resistance of the winding of the transformer is unqualified, the second short-circuit force meets the second condition to indicate that the electromagnetic force generated by the short-circuit impact current peak value in the winding of the transformer exceeds the short-circuit resistance of the winding of the transformer, the vibration characteristic quantity meets the third condition to indicate that the mechanical state of the winding of the transformer is extremely poor, and at the moment, according to the determination result, whether the winding of the transformer has mechanical faults can be determined.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. In the drawings:

fig. 1 shows a block diagram of a hardware architecture of a mobile terminal performing a method of determining a mechanical failure of a transformer winding according to an embodiment of the present application;

FIG. 2 illustrates a flow diagram of a method for determining a mechanical fault of a transformer winding provided in accordance with an embodiment of the present application;

fig. 3 shows a block diagram of a determination device for mechanical faults of a transformer winding according to an embodiment of the present application.

Detailed Description

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

In order to make the present application solution better understood by those skilled in the art, the following description will be made in detail and with reference to the accompanying drawings in the embodiments of the present application, it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, shall fall within the scope of the present application.

It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe the embodiments of the present application described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

As described in the background art, in order to solve the problem that in the prior art, whether a mechanical fault occurs in a transformer winding cannot be accurately determined by using a single vibration monitoring and evaluating method, the embodiment of the application provides a method for determining a mechanical fault in a transformer winding, a device for determining a mechanical fault in a transformer winding, a storage medium, a processor and an electronic device.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

The method embodiments provided in the embodiments of the present application may be performed in a mobile terminal, a computer terminal or similar computing device. Taking the operation on a mobile terminal as an example, fig. 1 is a block diagram of a hardware structure of a mobile terminal of a method for determining a mechanical fault of a transformer winding according to an embodiment of the present invention. As shown in fig. 1, a mobile terminal may include one or more (only one is shown in fig. 1) processors 102 (the processor 102 may include, but is not limited to, a microprocessor MCU or a processing device such as a programmable logic device FPGA) and a memory 104 for storing data, wherein the mobile terminal may also include a transmission device 106 for communication functions and an input-output device 108. It will be appreciated by those skilled in the art that the structure shown in fig. 1 is merely illustrative and not limiting of the structure of the mobile terminal described above. For example, the mobile terminal may also include more or fewer components than shown in fig. 1, or have a different configuration than shown in fig. 1.

The memory 104 may be used to store a computer program, for example, a software program of application software and a module, such as a computer program corresponding to a display method of device information in an embodiment of the present invention, and the processor 102 executes the computer program stored in the memory 104 to perform various functional applications and data processing, that is, to implement the above-described method. Memory 104 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include memory remotely located relative to the processor 102, which may be connected to the mobile terminal via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof. The transmission means 106 is arranged to receive or transmit data via a network. Specific examples of the network described above may include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, simply referred to as NIC) that can connect to other network devices through a base station to communicate with the internet. In one example, the transmission device 106 may be a Radio Frequency (RF) module, which is used to communicate with the internet wirelessly.

In this embodiment, a method for determining a mechanical failure of a transformer winding operating on a mobile terminal, a computer terminal or similar computing device is provided, it being noted that the steps illustrated in the flowchart of the figures may be performed in a computer system such as a set of computer executable instructions, and although a logical sequence is illustrated in the flowchart, in some cases the steps illustrated or described may be performed in a different order than that illustrated herein.

Fig. 2 is a flow chart of a method of determining a mechanical failure of a transformer winding according to an embodiment of the present application. As shown in fig. 2, the method comprises the steps of:

step S201, acquiring a first short-circuit force,

wherein the first short-circuit force is used for representing electromagnetic force applied to the winding of the transformer under the action of rated short-circuit current in the winding of the transformer, and the rated short-circuit current is determined by short-circuit capacity of the winding of the transformer and short-circuit impedance of the winding of the transformer;

specifically, the method of acquiring the first short-circuit force is as follows:

according to the short-circuit capacity of the windings of the transformer and the short-circuit impedance of the windings of the transformer specified in the GB1094.5 national standard, calculating rated short-circuit currents in the windings (high-voltage windings comprise A-phase high-voltage windings, B-phase high-voltage windings and C-phase high-voltage windings; medium-voltage windings comprise A-phase low-voltage windings, B-phase low-voltage windings and C-phase low-voltage windings; low-voltage windings comprise A-phase voltage regulation windings, B-phase voltage regulation windings and C-phase voltage regulation windings) of the transformer under different short-circuit fault types (fault types comprise single-phase, two-phase short-circuit and three-phase short-circuit);

Calculating leakage magnetic fields of windings of the transformer under different short circuit fault types (including single-phase grounding, two-phase short circuit and three-phase short circuit) by taking rated short circuit current of each winding of the transformer as input according to basic data of the transformer, wherein the basic data of the transformer at least comprise short circuit impedance of each winding of the transformer, structural size of each winding of the transformer and types of each winding of the transformer, and the structural size of each winding of the transformer at least comprises geometric height, radial thickness, inner diameter of the winding, main channel distance between the windings, upper end face distance of the winding from an upper iron yoke, lower end face distance of the winding from a lower iron yoke, innermost winding distance from an iron core and outermost winding distance from an oil tank;

according to rated short-circuit current of each winding of the transformer and leakage magnetic field of each winding of the transformer, calculating a first short-circuit force F of each winding of the transformer according to a calculation formula and a method disclosed in a transformer design principle, wherein the first short-circuit force F comprises an outer coil average annular tensile stress F1, an inner coil average annular compressive stress F2, a wire radial bending stress F3 in a span between stays or cushion blocks, a wire axial bending stress F4 in a span between the radial cushion blocks, a maximum axial compressive stress F5 on each solid winding related to wire inclination, a compressive stress of the radial cushion blocks or a compressive stress F6 of wire paper insulation in a layered winding and a compressive stress F7 of a paperboard laminated end ring.

Step S202, in case of short-circuit fault of the winding of the transformer, obtaining a second short-circuit force,

wherein the second short-circuit force is used for representing electromagnetic force applied to the winding of the transformer under the action of a short-circuit impact current peak value in the winding of the transformer;

specifically, the method of acquiring the second short-circuit force is as follows:

taking short-circuit impulse current peaks in windings of a transformer as input, and calculating leakage magnetic fields of the windings (a high-voltage side winding, a medium-voltage side winding, a low-voltage side winding and a voltage regulating side winding) of the transformer under the short-circuit fault type corresponding to the short-circuit fault by adopting a finite element modeling method according to basic data of the transformer, wherein the short-circuit current peaks are obtained from a wave recording device in a transformer substation;

according to rated short-circuit current of each winding of the transformer and leakage magnetic field of each winding of the transformer, calculating a second short-circuit force Fi of each winding under the short-circuit fault according to a calculation formula and a method disclosed in a transformer design principle, wherein i represents an ith short-circuit fault, and each type of short-circuit force comprises an outer coil average annular tensile stress Fi1, an inner coil average annular compressive stress Fi2, a wire radial bending stress Fi3 in a span between stays or cushion blocks, a wire axial bending stress Fi4 in a span between the radial cushion blocks, a maximum axial compressive stress Fi5 on each solid winding related to wire inclination, a compressive stress of the radial cushion blocks or a compressive stress Fi6 of wire paper insulation in a layered winding and a compressive stress Fi7 of a paperboard laminated end ring.

Step S203, the vibration characteristic amount is acquired,

wherein the vibration characteristic quantity is used for representing the mechanical state of the winding of the transformer and is determined by a vibration signal of a tank wall of the transformer;

specifically, a vibration acceleration sensor is adopted to collect vibration signals of the tank wall of the transformer, the sampling rate of the vibration signals is Fs, the sampling rate is usually not lower than 8kHz, the vibration acceleration sensor is at least arranged on the tank wall of the high-voltage outgoing line side of the transformer, corresponding to the upper, middle and lower parts of the high-voltage winding A phase, the high-voltage winding B phase and the high-voltage winding C phase, and if the conditions are met, the vibration acceleration sensor is also arranged on the tank wall of the medium-voltage outgoing line side of the transformer.

The vibration characteristic quantity at least includes a vibration amplitude, a high-low frequency vibration power ratio, a vibration power entropy, a vibration power parity harmonic ratio, a first stable characteristic value and a second stable characteristic value, and the step S203 may be implemented as:

according to

Determining the vibration amplitude, wherein +.>

For the vibration amplitude, +.>

Is the vibration signal;

according to

Determining the ratio of the high frequency vibration power to the low frequency vibration power, wherein +.>

For the high-low frequency vibration power ratio, +.>

，/>

，/>

For the power spectrum +.>

Is obtained by carrying out Fourier transform on the autocorrelation function of the vibration signal;

In particular, the method comprises the steps of,

for->

Normalized power spectrum obtained by normalization processing, < >>

Is->

Accumulated vibration power of the frequency band.

According to

Determining the vibration power entropy, wherein ∈>

For the above vibration power entropy->

，

，/>

，/>

Is a frequency correction coefficient;

in particular, the method comprises the steps of,

for the probability of the power spectrum distribution, +.>

Is the corrected power spectrum.

According to

Determining a vibration power parity harmonic ratio, wherein +.>

A parity harmonic ratio of the vibration power;

according to

Determining a first stable characteristic value and according to +.>

Determining a second stability characteristic, wherein ∈>

For the first stable characteristic value, +.>

For the second stable characteristic value, +.>

For a first preset value,/o>

For a second preset value,/->

，/>

At a first preset frequency for the vibration signalAmplitude at>

For the amplitude of the load current signal of the above-mentioned transformer at a second preset frequency, +.>

For the rated current of the above-mentioned transformer, +.>

，

For the phase angle of the vibration signal at the first preset frequency,/or->

For the phase angle of the load current signal at the second predetermined frequency.

Specifically, the first preset frequency is 100Hz, and the second preset frequency is 50Hz.

In this embodiment, the vibration characteristic quantity is extracted from the vibration signal of the transformer tank wall: vibration amplitude, high-low frequency vibration power ratio, vibration power entropy, vibration power parity harmonic ratio, first stability characteristic value and second stability characteristic value, these vibration characteristic values can reflect the mechanical state of the winding of the transformer.

Step S204, determining whether the first short-circuit force meets a first condition, determining whether the second short-circuit force meets a second condition, and determining whether the vibration characteristic quantity meets a third condition, so as to obtain a determination result, wherein the first condition is that the first short-circuit force is larger than a preset short-circuit force, the second condition is that the second short-circuit force is larger than the preset short-circuit force, and the third condition is that the vibration characteristic quantity is larger than the preset characteristic quantity;

specifically, the first short-circuit force meeting the first condition indicates that the innate short-circuit resistance of the transformed winding is not qualified, the second short-circuit force meeting the second condition indicates that the electromagnetic force generated by the short-circuit impact current peak value in the transformer winding exceeds the short-circuit resistance of the transformer winding, the vibration characteristic quantity meeting the third condition indicates that the mechanical state of the transformer winding is extremely poor, the first short-circuit force not meeting the first condition indicates that the innate short-circuit resistance of the transformed winding is qualified, the second short-circuit force not meeting the second condition indicates that the electromagnetic force generated by the short-circuit impact current peak value in the transformer winding does not exceed the short-circuit resistance of the transformer winding, and the vibration characteristic quantity meeting the third condition indicates that the mechanical state of the transformer winding is normal.

Specifically, according to the types of windings (such as flat wires, transposed wires, self-adhesive transposed wires and the like) of the transformer, according to the national standard of GB1094.5, calculating the preset short-circuit force of each winding of the transformer, wherein the preset short-circuit force corresponding to the outer coil average annular tensile stress F1 and the outer coil average annular tensile stress Fi1 is FL1, the preset short-circuit force corresponding to the inner coil average annular compressive stress F2 and the inner coil average annular compressive stress Fi2 is FL2, the preset short-circuit force corresponding to the wire width-direction bending stress F3 in the span between the stays or the cushion blocks and the wire width-direction bending stress Fi3 in the span between the stays or the cushion blocks is FL3, the preset short-circuit force corresponding to the wire axial bending stress F4 in the span between the radial pads and the wire axial bending stress Fi4 in the span between the radial pads is FL4, the preset short-circuit force corresponding to the maximum axial compressive stress F5 on each solid winding related to wire inclination and the maximum axial compressive stress Fi5 on each solid winding related to wire inclination is FL5, the preset short-circuit force corresponding to the compressive stress F6 of the wire paper insulation in the radial pad or the layered winding and the compressive stress Fi6 of the wire paper insulation in the radial pad or the layered winding is FL6, and the preset short-circuit force corresponding to the compressive stress F7 of the paperboard lamination end ring and the compressive stress Fi7 of the paperboard lamination end ring is FL7.

Specifically, when any one of an outer coil average annular tensile stress Fi1, an inner coil average annular compressive stress Fi2, a brace, or a wire radial bending stress Fi3 in a span between pads of a winding of the transformer, a wire axial bending stress Fi4 in a span between pads in a radial direction, a maximum axial compressive stress Fi5 on each solid winding related to wire inclination, a compressive stress Fi6 of wire paper insulation in a radial pad, or a compressive stress Fi7 of a wire paper insulation in a layered winding, and a compressive stress Fi7 of a cardboard laminate end ring is greater than a corresponding preset short-circuit force, a first short-circuit force of the winding of the transformer is determined to satisfy a first condition, and when any one of an outer coil average annular tensile stress Fi1, an inner coil average annular compressive stress Fi2, a wire radial bending stress Fi3 in a span between braces, or a wire axial bending stress Fi4 in a span between pads in a radial direction, a maximum axial compressive stress Fi5 on each solid winding related to wire inclination, a compressive stress Fi6 of a wire paper insulation in a radial pad, or a cardboard laminate end of a wire paper insulation in a layered winding and a corresponding preset short-circuit force is determined to satisfy a second condition.

Specifically, the preset characteristic quantities corresponding to the amplitude V1, the high-low frequency vibration power ratio V2, the vibration power entropy V3 and the vibration stability V5 of the winding of the transformer are epsilon 1, epsilon 2, epsilon 3, epsilon 51 and epsilon 52 respectively, when V4 is less than or equal to 0.1, I50/Ie is less than or equal to 0.7, the direct current bias current is less than 1A, the voltage harmonic distortion rate is less than or equal to 5% and the current harmonic distortion rate is less than or equal to 5%, whether V1 is greater than epsilon 1 is determined, whether V2 is greater than epsilon 2 is determined, whether V3 is greater than epsilon 3 is determined, whether V4 is greater than epsilon 4 is determined, whether V5 is greater than epsilon 5 is determined, and when any three of the amplitude V1, the high-low frequency vibration power ratio V2, the vibration power entropy V3 and the vibration stability V5 are greater than the corresponding preset characteristic quantities, the vibration characteristic quantity of the winding of the transformer is determined to meet a third condition, otherwise, the vibration characteristic quantity of the winding of the transformer is determined to not meet the third condition, wherein the direct current bias current can be monitored directly, and the voltage bias current and the harmonic distortion rate GB/distortion rate are calculated by adopting a harmonic distortion rate calculation method of 14549.

The transformer includes a plurality of windings, one corresponding to each of the windings, where the phases include an a phase, a B phase, and a C phase, and determining whether the second shorting force satisfies the second condition in step S203 may be implemented as:

Acquiring a target phase, and determining a plurality of target windings according to the target phase, wherein the target phase is the phase of the winding with the short-circuit fault, and the target winding is the winding with the target phase;

determining whether said second shorting force of each said target winding satisfies said second condition.

In this embodiment, the target phase, i.e., the phase of the winding having the short-circuit fault, is obtained from the transformer substation internal wave recording device, for example, the short-circuit fault is that the single-phase ground fault occurs in the a-phase pressure winding, at this time, the target phase is determined to be the a-phase low-pressure winding, the a-phase pressure winding and the a-phase high-pressure winding, the outer coil average annular tensile stress Fi1 of the a-phase low-pressure winding, the inner coil average annular compressive stress Fi2, the wire radial bending stress Fi3 in the span between the stays or pads, the wire axial bending stress Fi4 in the span between the radial pads, the maximum axial compressive stress Fi5 on each entity winding related to wire inclination, whether the compressive stress Fi6 of the wire paper insulation in the radial pad or the compressive stress Fi7 of the laminate end ring is greater than the corresponding preset short-circuit force, the outer coil average annular stress Fi1 of the a-phase pressure winding, the wire radial bending stress Fi2 in the inner coil average annular stress Fi2 between the stays or pads, the wire radial bending stress Fi3 in the span between the inner coil average annular stress Fi, the wire radial bending stress Fi4 in the span between the inner coil average annular stress Fi or pads, the wire bending stress Fi4 in the span between the radial winding and the corresponding large entity winding and the axial stress Fi4 of the wire inclination related to the wire, the wire paper insulation in the layer winding, and the wire insulation stress Fi6 and the laminate end ring of the laminate end ring, and the layer of the laminate layer, and the wire insulation is determined to be greater than the corresponding axial stress or not Whether the compressive stress Fi6 of the radial pad or the compressive stress Fi7 of the wire paper insulation in the layer windings and the compressive stress Fi7 of the paperboard laminate end turns are greater than the corresponding preset short circuit forces.

The transformer includes a plurality of windings, one of the windings corresponds to one phase, the one phase includes an a phase, a B phase, and a C phase, the second short-circuit force has a plurality of types, the second short-circuit force of one type corresponds to one fault type, and in order to determine a type of mechanical fault of the winding of the transformer, in an alternative scheme, after determining whether the second short-circuit force satisfies the second condition in step S203, the method further includes:

and determining that the mechanical fault of a target fault type occurs in the target winding when the second short-circuit force of the target winding satisfies the second condition, the target fault type being the fault type corresponding to the type of the second short-circuit force of the target winding.

In this embodiment, taking the target winding as the a-phase low-voltage winding as an example, when Fi1> FL1 or Fi2> FL2 or Fi3> FL3, it is determined that the a-phase low-voltage winding is deformed in the radial direction, when Fi4> FL4, it is determined that the a-phase low-voltage winding is likely to be deformed in the axial direction, and when Fi5> FL5 or Fi6> FL6 or Fi7> FL7, it is determined that the a-phase low-voltage winding is axially compressed and loosened.

In order to determine the location of the occurrence of the mechanical failure of the winding of the transformer, in an alternative, after determining in step S203 whether the second shorting force satisfies the second condition, the method further comprises:

And uploading the target phase and a target voltage level to a cloud server when the second short-circuit force of the target winding satisfies the second condition, wherein the target voltage level is the voltage level of the target winding.

In this embodiment, for example, the short-circuit fault is a single-phase earth fault occurring in the a-phase voltage winding, at this time, it is determined that the target phase is the a-phase, the target winding is the a-phase low-voltage winding, the a-phase voltage winding and the a-phase high-voltage winding, the second short-circuit force of the a-phase low-voltage winding satisfies the first condition, the second short-circuit force of the a-phase voltage winding does not satisfy the first condition, the second short-circuit force of the a-phase high-voltage winding does not satisfy the first condition, that is, the target voltage level is the low voltage, the a-phase and the low voltage are uploaded to the cloud server, and the operator is notified of the position where the mechanical fault occurs in the a-phase low-voltage winding of the transformer.

Step S205, determining whether the winding of the transformer has mechanical failure according to the determined result.

Specifically, the first short-circuit force meets the first condition to indicate that the congenital short-circuit resistance of the winding of the transformer is unqualified, the second short-circuit force meets the second condition to indicate that the electromagnetic force generated by the short-circuit impact current peak value in the winding of the transformer exceeds the short-circuit resistance of the winding of the transformer, the vibration characteristic quantity meets the third condition to indicate that the mechanical state of the winding of the transformer is extremely poor, and at the moment, according to the determination result, whether the winding of the transformer has mechanical faults or not can be determined.

Step S205 may be implemented as:

step S2051 of determining that the mechanical failure occurs to a first degree in the winding of the transformer when the determination result is a first determination result, the first determination result indicating that the first short-circuit force satisfies the first condition, the second short-circuit force satisfies the second condition, and the vibration characteristic amount satisfies the third condition;

step S2052 of determining that the winding of the transformer has the mechanical failure to a second degree if the determination result is at least one of a second determination result, a third determination result, and a fourth determination result, wherein the second determination result indicates that the first short-circuit force satisfies the first condition, the second short-circuit force does not satisfy the second condition, the vibration characteristic amount satisfies the third condition, the third determination result indicates that the first short-circuit force satisfies the first condition, the second short-circuit force satisfies the second condition, the vibration characteristic amount does not satisfy the third condition, the fourth determination result indicates that the first short-circuit force does not satisfy the first condition, the second short-circuit force does not satisfy the second condition, and the vibration characteristic amount satisfies the third condition;

Step S2053, when the determination result is a fifth determination result, of determining that the mechanical failure occurs to a third degree in the winding of the transformer, wherein the fifth determination result indicates that the first short-circuit force satisfies the first condition, the second short-circuit force does not satisfy the second condition, the vibration characteristic amount does not satisfy the third condition, and the first degree is greater than the second degree, and the second degree is greater than the third degree.

In this embodiment, when determining the severity of a mechanical fault occurring in a winding of a transformer, the first short-circuit force, the occurrence of the short-circuit fault, the second short-circuit force, and the vibration characteristic amount are comprehensively considered, and the specific method is as follows:

the 4 factors of the first short-circuit force, the short-circuit fault, the second short-circuit force and the vibration characteristic quantity are respectively represented by codes {1,0}, wherein: the first short-circuit force satisfies a first condition {1}, and the first short-circuit force does not satisfy the first condition {0}; the occurrence of short-circuit fault is {1}, and the non-occurrence of short-circuit fault is {0}; the second short-circuit force satisfies a second condition {1}, and the second short-circuit force does not satisfy the second condition {0}; the vibration feature quantity satisfies the third condition {1}, and the vibration feature quantity does not satisfy the third condition {0};

When the code {1, 1} (the above first determination result), it is determined that the winding of the transformer is already in a serious state (it is determined that the winding of the transformer is mechanically failed to a first degree), and the power outage check should be immediately performed.

When the codes are {1, 0} (the third determination result), {1, 0, 1} (the second determination result), and {0, 1, 0, 1} (the fourth determination result), determining that the winding of the transformer is in an abnormal state (determining that the winding of the transformer has a second degree of mechanical failure), suggesting to strengthen the operation and maintenance, and avoiding the occurrence of a short-circuit failure again;

when the code is {1, 0} (the fifth determination result), determining that the winding of the transformer is in an attention state (determining that the winding of the transformer has a third degree of mechanical failure), suggesting continuous tracking to avoid the occurrence of short-circuit failure again;

when the codes are {0, 0 and 1}, judging that the winding of the transformer is in an attention state, suggesting continuous tracking, avoiding short circuit faults again, and possibly showing signs of reduction of compaction force, loosening and the like of the winding of the transformer;

when the codes are {0, 1, 0} and {0, 0}, it is determined that the transformer winding is in a normal state, and no other measures are taken.

Since the first short-circuit force, the occurrence of the short-circuit fault, the second short-circuit force and the vibration characteristic quantity are comprehensively considered, the severity of the mechanical fault occurring in the winding of the transformer can be more accurately determined.

Through the embodiment, the first short-circuit force meets the first condition to indicate that the innate short-circuit resistance of the transformer winding is unqualified, the second short-circuit force meets the second condition to indicate that the electromagnetic force generated by the short-circuit impact current peak value in the transformer winding exceeds the short-circuit resistance of the transformer winding, the vibration characteristic quantity meets the third condition to indicate that the mechanical state of the transformer winding is extremely poor, and at the moment, according to the determination result, whether the transformer winding has mechanical faults can be determined.

The embodiment of the application also provides a device for determining the mechanical fault of the transformer winding, and the device for determining the mechanical fault of the transformer winding can be used for executing the method for determining the mechanical fault of the transformer winding. The device is used for realizing the above embodiments and preferred embodiments, and is not described in detail. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. While the means described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware, is also possible and contemplated.

The following describes a device for determining a mechanical fault of a transformer winding provided in an embodiment of the present application.

Fig. 3 is a schematic diagram of a determination device of a mechanical failure of a transformer winding according to an embodiment of the present application. As shown in fig. 3, the apparatus includes:

a first acquisition unit 10 for acquiring a first short-circuit force,

A second acquisition unit 20 for acquiring a second short-circuit force in case of a short-circuit failure of the winding of the transformer,

A third acquisition unit 30 for acquiring the vibration characteristic quantity,

The vibration characteristic quantity at least comprises a vibration amplitude, a high-low frequency vibration power ratio, a vibration power entropy, a vibration power parity harmonic ratio, a first stable characteristic value and a second stable characteristic value, and the third acquisition unit comprises a first determination module, a second determination module, a third determination module, a fourth determination module and a fifth determination module:

the first determining module is used for determining the first determining module according to the following conditions

Determining the vibration amplitude, wherein +.>

For the vibration amplitude, +.>

Is the vibration signal;

the second determining module is used for determining the following parameters according to

For the high-low frequency vibration power ratio, +.>

，/>

，/>

For the power spectrum +.>

in particular, the method comprises the steps of,

for->

Normalized power spectrum obtained by normalization processing, < >>

Is->

Accumulated vibration power of the frequency band.

The third determining module is configured to, according to

Determining the vibration power entropy, wherein ∈>

Entropy of the vibration power，/>

，/>

，/>

，/>

Is a frequency correction coefficient;

in particular, the method comprises the steps of,

for the probability of the power spectrum distribution, +.>

Is the corrected power spectrum.

The fourth determining module is configured to, according to

Determining a vibration power parity harmonic ratio, wherein +.>

A parity harmonic ratio of the vibration power;

the fifth determination module is used for determining the following parameters

Determining a first stable characteristic value and according to +.>

Determining a second stability characteristic, wherein ∈>

For the first stable characteristic value, +.>

For the second stable characteristic value, +.>

For a first preset value,/o>

For a second preset value,/->

，/>

For the amplitude of the vibration signal at a first preset frequency,/or->

For the rated current of the above-mentioned transformer, +.>

，/>

For the phase angle of the vibration signal at the first preset frequency,/or->

A first determining unit 40, configured to determine whether the first short-circuit force meets a first condition, and determine whether the second short-circuit force meets a second condition, and determine whether the vibration feature quantity meets a third condition, to obtain a determination result, where the first condition is that the first short-circuit force is greater than a preset short-circuit force, the second condition is that the second short-circuit force is greater than the preset short-circuit force, and the third condition is that the vibration feature quantity is greater than the preset feature quantity;

The transformer comprises a plurality of windings, one corresponding to each phase, the phase comprising an a phase, a B phase and a C phase, the second acquisition unit comprising a first acquisition module and a sixth determination module,

The acquisition module is used for acquiring a target phase and determining a plurality of target windings according to the target phase, wherein the target phase is the phase of the winding with the short-circuit fault, and the target winding is the winding with the target phase;

and a sixth determining module configured to determine whether the second shorting force of each of the target windings satisfies the second condition.

The transformer comprises a plurality of windings, one of the windings corresponding to each of the phases comprising an a-phase, a B-phase and a C-phase, the second shorting force having a plurality of types, the second shorting force of one type corresponding to one fault type, in order to determine the type of mechanical fault of the winding of the transformer, in an alternative arrangement the device further comprises:

and a third determining unit configured to determine that the mechanical fault of a target fault type occurs in the target winding when the second short-circuit force of the target winding satisfies the second condition, the target fault type being the fault type corresponding to the type of the second short-circuit force of the target winding.

One of the windings corresponds to a voltage level, and in order to determine the location of the occurrence of a mechanical failure of the winding of the transformer, in an alternative arrangement the device further comprises an uploading unit,

And the uploading unit is configured to upload the target phase and a target voltage level to a cloud server when the second short-circuit force of the target winding satisfies the second condition, where the target voltage level is the voltage level of the target winding.

A second determining unit 50 for determining whether a mechanical failure occurs in the winding of the transformer according to the determination result.

The second determination unit includes a seventh determination module, an eighth determination module and a ninth determination module,

the seventh determining module is configured to determine that the mechanical failure occurs to a first extent in the winding of the transformer when the determination result is a first determination result, where the first determination result indicates that the first short-circuit force satisfies the first condition, the second short-circuit force satisfies the second condition, and the vibration feature satisfies the third condition;

the eighth determination module is configured to determine that the winding of the transformer has the mechanical failure to a second extent if the determination result is at least one of a second determination result, a third determination result, and a fourth determination result, the second determination result indicates that the first short-circuit force satisfies the first condition, the second short-circuit force does not satisfy the second condition, the vibration feature quantity satisfies the third condition, the third determination result indicates that the first short-circuit force satisfies the first condition, the second short-circuit force satisfies the second condition, the vibration feature quantity does not satisfy the third condition, the fourth determination result indicates that the first short-circuit force does not satisfy the first condition, the second short-circuit force does not satisfy the second condition, and the vibration feature quantity satisfies the third condition;

The ninth determination module is configured to determine that the mechanical failure occurs to a third degree in the winding of the transformer when the determination result is a fifth determination result, where the fifth determination result indicates that the first short-circuit force satisfies the first condition, the second short-circuit force does not satisfy the second condition, and the vibration feature does not satisfy the third condition, and the first degree is greater than the second degree, and the second degree is greater than the third degree.

The device for determining the mechanical fault of the transformer winding comprises a processor and a memory, wherein the first acquisition unit, the second acquisition unit, the third acquisition unit, the first determination unit, the second determination unit and the like are all stored in the memory as program units, and the processor executes the program units stored in the memory to realize corresponding functions. The modules are all located in the same processor; alternatively, the above modules may be located in different processors in any combination.

The processor includes a kernel, and the kernel fetches the corresponding program unit from the memory. The inner core can be provided with one or more than one, and the problem that whether the transformer winding has mechanical faults or not cannot be accurately determined by adopting a single vibration monitoring and evaluating method in the prior art is solved by adjusting the parameters of the inner core.

The memory may include volatile memory, random Access Memory (RAM), and/or nonvolatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM), among other forms in computer readable media, the memory including at least one memory chip.

The embodiment of the invention provides a computer readable storage medium, which comprises a stored program, wherein the program is controlled to control equipment where the computer readable storage medium is located to execute the method for determining the mechanical faults of the transformer winding.

Specifically, the method for determining the mechanical faults of the transformer winding comprises the following steps:

step S201, acquiring a first short-circuit force,

step S203, the vibration characteristic amount is acquired,

The embodiment of the invention provides a processor, which is used for running a program, wherein the method for determining the mechanical faults of the transformer winding is executed when the program runs.

step S201, acquiring a first short-circuit force,

step S203, the vibration characteristic amount is acquired,

The embodiment of the invention provides equipment, which comprises a processor, a memory and a program stored in the memory and capable of running on the processor, wherein the processor realizes at least the following steps when executing the program:

step S201, acquiring a first short-circuit force,

step S203, the vibration characteristic amount is acquired,

The device herein may be a server, PC, PAD, cell phone, etc.

The present application also provides a computer program product adapted to perform a program initialized with at least the following method steps when executed on a data processing device:

Step S201, acquiring a first short-circuit force,

step S203, the vibration characteristic amount is acquired,

It will be appreciated by those skilled in the art that the modules or steps of the invention described above may be implemented in a general purpose computing device, they may be concentrated on a single computing device, or distributed across a network of computing devices, they may be implemented in program code executable by computing devices, so that they may be stored in a storage device for execution by computing devices, and in some cases, the steps shown or described may be performed in a different order than that shown or described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple modules or steps of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.

It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

In one typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.

The memory may include volatile memory in a computer-readable medium, random Access Memory (RAM) and/or nonvolatile memory, etc., such as Read Only Memory (ROM) or flash RAM. Memory is an example of a computer-readable medium.

Computer readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.

It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises an element.

From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

1) According to the method for determining the mechanical faults of the transformer winding, the first short-circuit force is obtained; obtaining a second short-circuit force under the condition that the windings of the transformer have short-circuit faults; obtaining a vibration characteristic quantity; determining whether the first short-circuit force meets a first condition, determining whether the second short-circuit force meets a second condition, determining whether the vibration characteristic quantity meets a third condition, and obtaining a determination result, wherein the first condition is that the first short-circuit force is larger than a preset short-circuit force, the second condition is that the second short-circuit force is larger than the preset short-circuit force, and the third condition is that the vibration characteristic quantity is larger than the preset characteristic quantity; and determining whether the winding of the transformer has mechanical failure according to the determination result. According to the method, the first short-circuit force meets the first condition to indicate that the congenital short-circuit resistance of the transformer winding is unqualified, the second short-circuit force meets the second condition to indicate that the electromagnetic force generated by the short-circuit impact current peak value in the transformer winding exceeds the short-circuit resistance of the transformer winding, the vibration characteristic quantity meets the third condition to indicate that the mechanical state of the transformer winding is extremely poor, at the moment, whether the transformer winding has a mechanical fault or not can be determined according to the determination result, and because the method comprehensively considers the congenital short-circuit resistance of the transformer winding and whether the electromagnetic force generated by the short-circuit impact current peak value in the transformer winding exceeds the short-circuit resistance and vibration characteristic quantity of the transformer winding when determining whether the transformer winding has the mechanical fault or not, the problem that whether the transformer winding has the mechanical fault or not can not be accurately determined by adopting a single vibration monitoring and evaluating method in the prior art is solved.

2) The device for determining the mechanical faults of the transformer winding comprises: the first acquisition unit is used for acquiring a first short-circuit force; a second obtaining unit, configured to obtain a second short-circuit force when a short-circuit fault occurs in the winding of the transformer; a third acquisition unit configured to acquire a vibration characteristic amount; a first determining unit configured to determine whether the first short-circuit force satisfies a first condition, determine whether the second short-circuit force satisfies a second condition, and determine whether the vibration feature quantity satisfies a third condition, and obtain a determination result, where the first condition is that the first short-circuit force is greater than a preset short-circuit force, the second condition is that the second short-circuit force is greater than the preset short-circuit force, and the third condition is that the vibration feature quantity is greater than the preset feature quantity; and a second determining unit for determining whether the winding of the transformer has a mechanical failure according to the determination result. The first short-circuit force meets the first condition to indicate that the congenital short-circuit resistance of the transformer winding is unqualified, the second short-circuit force meets the second condition to indicate that the electromagnetic force generated by the short-circuit impact current peak value in the transformer winding exceeds the short-circuit resistance of the transformer winding, and the vibration characteristic quantity meets the third condition to indicate that the mechanical state of the transformer winding is extremely poor.

The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A method of determining a mechanical failure of a transformer winding, the method comprising:

acquiring a first short-circuit force, wherein the first short-circuit force is used for representing electromagnetic force born by a winding of a transformer under the action of rated short-circuit current in the winding of the transformer, and the rated short-circuit current is determined by short-circuit capacity of the winding of the transformer and short-circuit impedance of the winding of the transformer;

obtaining a second short-circuit force under the condition that the windings of the transformer have short-circuit faults, wherein the second short-circuit force is used for representing electromagnetic force applied to the windings of the transformer under the action of short-circuit impact current peaks in the windings of the transformer;

obtaining a vibration characteristic quantity, wherein the vibration characteristic quantity is used for representing the mechanical state of the winding of the transformer and is determined by a vibration signal of a tank wall of the transformer;

Determining whether the first short-circuit force meets a first condition, determining whether the second short-circuit force meets a second condition, determining whether the vibration characteristic quantity meets a third condition, and obtaining a determination result, wherein the first condition is that the first short-circuit force is larger than a preset short-circuit force, the second condition is that the second short-circuit force is larger than the preset short-circuit force, and the third condition is that the vibration characteristic quantity is larger than the preset characteristic quantity;

and determining whether the winding of the transformer has mechanical failure according to the determination result.

2. The method of claim 1, wherein determining whether the winding of the transformer is mechanically faulty based on the determination comprises:

determining that the mechanical failure occurs to a first extent in the winding of the transformer, in a case where the determination result is a first determination result, the first determination result indicating that the first short-circuit force satisfies the first condition, the second short-circuit force satisfies the second condition, and the vibration feature satisfies the third condition;

in the case where the determination result is at least one of a second determination result, a third determination result, and a fourth determination result, it is determined that the winding of the transformer is mechanically failed to a second degree, the second determination result indicates that the first short-circuit force satisfies the first condition and the second short-circuit force does not satisfy the second condition and the vibration feature satisfies the third condition, the third determination result indicates that the first short-circuit force satisfies the first condition and the second short-circuit force satisfies the second condition and the vibration feature does not satisfy the third condition, the fourth determination result indicates that the first short-circuit force does not satisfy the first condition and the second short-circuit force does not satisfy the second condition and the vibration feature satisfies the third condition;

And determining that the mechanical failure occurs to a third degree in the winding of the transformer in the case where the determination result is a fifth determination result, the fifth determination result indicating that the first short-circuit force satisfies the first condition and the second short-circuit force does not satisfy the second condition, and the vibration feature does not satisfy the third condition, the first degree being greater than the second degree, the second degree being greater than the third degree.

3. The method of claim 1, wherein the transformer includes a plurality of windings, one corresponding to each phase, the phase including an a-phase, a B-phase, and a C-phase, and determining whether the second shorting force satisfies a second condition includes:

acquiring a target phase, and determining a plurality of target windings according to the target phase, wherein the target phase is the phase of the winding with the short-circuit fault, and the target windings are the windings of the target phase;

determining whether the second shorting force of each of the target windings satisfies the second condition.

4. A method according to claim 3, wherein the transformer comprises a plurality of windings, one of the windings corresponding to each phase, the each phase comprising an a-phase, a B-phase and a C-phase, the second shorting force having a plurality of types, the second shorting force of one type corresponding to one fault type, the method further comprising, after determining whether the second shorting force meets a second condition:

And determining that the mechanical fault of a target fault type occurs in the target winding under the condition that the second short-circuit force of the target winding meets the second condition, wherein the target fault type is the fault type corresponding to the second short-circuit force type of the target winding.

5. A method according to claim 3, wherein one of the windings corresponds to a voltage level, the method further comprising, after determining whether the second shorting force satisfies a second condition:

and uploading the target phase and a target voltage level to a cloud server when the second short-circuit force of the target winding meets the second condition, wherein the target voltage level is the voltage level of the target winding.

6. The method of claim 1, wherein the vibration signature includes at least a vibration amplitude, a high-low frequency vibration power ratio, a vibration power entropy, a vibration power parity harmonic ratio, a first stability signature and a second stability signature, and wherein obtaining the vibration signature includes:

according to

Determining the vibration amplitude, wherein +.>

For the vibration amplitude, +.>

Is the vibration signal;

According to

Determining the high-low frequency vibration power ratio, wherein +.>

For the high-low frequency vibration power ratio,

，/>

，/>

for the power spectrum +.>

By performing a fourier transform on the autocorrelation function of the vibration signalConversion of folium Ricini;

according to

Determining the vibration power entropy, wherein ∈>

For the vibration power entropy, < >>

，

，/>

，/>

Is a frequency correction coefficient;

according to

Determining a vibration power parity harmonic ratio, wherein +.>

A parity harmonic ratio for the vibration power;

according to

Determining a first stable characteristic value and according to +.>

Determining a second stability characteristic, wherein ∈>

For the first stable characteristic value, +.>

For the second stable characteristic value, +.>

For a first preset value,/o>

For a second preset value,/->

，/>

For the amplitude of the vibration signal at a first preset frequency,/or->

For the rated current of the transformer, +.>

，/>

For the phase angle of the vibration signal at the first preset frequency,/or->

A phase angle at the second preset frequency for the load current signal.

7. A device for determining a mechanical failure of a transformer winding, the device comprising:

a first acquisition unit for acquiring a first short-circuit force for characterizing an electromagnetic force received by a winding of a transformer under the action of a rated short-circuit current in the winding of the transformer, the rated short-circuit current being determined by a short-circuit capacity of the winding of the transformer and a short-circuit impedance of the winding of the transformer;

A second obtaining unit, configured to obtain a second short-circuit force when a short-circuit fault occurs in the winding of the transformer, where the second short-circuit force is used to characterize an electromagnetic force received by the winding of the transformer under the action of a short-circuit impact current peak value in the winding of the transformer;

a third acquisition unit for acquiring a vibration characteristic quantity, which is used for representing the mechanical state of the winding of the transformer and is determined by a vibration signal of a tank wall of the transformer;

a first determining unit, configured to determine whether the first short-circuit force meets a first condition, determine whether the second short-circuit force meets a second condition, and determine whether the vibration feature quantity meets a third condition, to obtain a determination result, where the first condition is that the first short-circuit force is greater than a preset short-circuit force, the second condition is that the second short-circuit force is greater than the preset short-circuit force, and the third condition is that the vibration feature quantity is greater than a preset feature quantity;

and the second determining unit is used for determining whether the winding of the transformer has mechanical faults according to the determination result.

8. A computer readable storage medium, characterized in that the computer readable storage medium comprises a stored program, wherein the program when run controls a device in which the computer readable storage medium is located to perform the method of determining a mechanical failure of a transformer winding according to any one of claims 1 to 6.

9. A processor for running a program, wherein the program when run performs the method of determining a mechanical failure of a transformer winding according to any of claims 1 to 6.

10. An electronic device, comprising: one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs comprising a method for performing the determination of a mechanical failure of a transformer winding of any of claims 1-6.