CN111856343B - Transformer winding deformation analysis method, device, equipment and storage medium - Google Patents
Transformer winding deformation analysis method, device, equipment and storage medium Download PDFInfo
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- CN111856343B CN111856343B CN202010783804.9A CN202010783804A CN111856343B CN 111856343 B CN111856343 B CN 111856343B CN 202010783804 A CN202010783804 A CN 202010783804A CN 111856343 B CN111856343 B CN 111856343B
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/72—Testing of electric windings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
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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
- G01R31/50—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
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/62—Testing of transformers
Abstract
The application discloses a transformer winding deformation analysis method, a device, equipment and a storage medium, wherein the method comprises the following steps: acquiring a test frequency band and a reference frequency band of a transformer winding, wherein the configuration process of the reference frequency band comprises the following steps: the method comprises the steps that a phase-frequency curve is segmented based on an initial frequency point, a zero-crossing frequency point and a termination frequency point of the phase-frequency curve of a transformer winding reference frequency response sequence; calculating to obtain the deformation coefficient of the transformer winding according to the test frequency band and the reference frequency band based on a preset deformation coefficient calculation formula; and obtaining the deformation degree corresponding to the deformation coefficient based on the corresponding relation between the deformation coefficient and the deformation degree according to the deformation coefficient, and taking the deformation degree as the deformation degree of the transformer winding. The method solves the technical problem that the deformation degree of the transformer winding cannot be accurately analyzed due to the fact that deformation analysis of different transformer windings has large difference due to different winding structure types and capacities of different transformers when the transformer winding is analyzed in the prior art.
Description
The application requests the priority of Chinese patent application with application number 201911380103.4, which is applied on the day of 12 and 27 in 2019.
Technical Field
The present disclosure relates to the field of transformer analysis, and in particular, to a transformer winding deformation analysis method, apparatus, device, and storage medium.
Background
Transformers play a very critical role in the power transmission and conversion of an electric power system, and it is therefore crucial for the electric power system to ensure stable operation of the transformers. The short-circuit fault is one of main faults in the operation of a power grid system, and when the short-circuit fault occurs to the power grid system, the accumulated deformation of a transformer winding is caused under the impact of short-circuit current, so that the transformer is mainly damaged. Therefore, how to accurately analyze the accumulated deformation degree of the transformer winding is the most effective method for preventing the transformer from being damaged.
The frequency response method is a transformer winding deformation analysis method which is widely applied at present, and has the characteristics of high test sensitivity and strong anti-interference capability. When the transformer winding deformation is analyzed using the frequency response method, the analysis frequency band is generally divided into three fixed frequency bands, i.e., a low frequency band (1kHz to 100kHz), a middle frequency band (100kHz to 600kHz), and a high frequency band (600kHz to 1MHz), and then the transformer winding deformation is analyzed based on the divided frequency bands. Although the deformation analysis of the winding can be performed by a fixed frequency division method for different transformers, the deformation degree of the transformer winding cannot be accurately analyzed.
Disclosure of Invention
In view of the above, the present application provides a transformer winding deformation analysis method, apparatus, device and storage medium, which are used to solve the technical problem that, in the existing transformer winding deformation analysis, due to different transformer winding structure types and different capacities, the deformation analysis of different transformer windings has a large difference, so that the deformation degree of the transformer winding cannot be accurately analyzed.
The application provides a transformer winding deformation analysis method in a first aspect, which includes:
acquiring a test frequency band and a reference frequency band of a transformer winding, wherein the configuration process of the reference frequency band comprises the following steps: segmenting the phase-frequency curve to obtain the reference frequency band based on the initial frequency point, the zero-crossing frequency point and the termination frequency point of the phase-frequency curve of the reference frequency response sequence of the transformer winding;
calculating to obtain the deformation coefficient of the transformer winding according to the test frequency band and the reference frequency band based on a preset deformation coefficient calculation formula;
and obtaining the deformation degree corresponding to the deformation coefficient based on the corresponding relation between the deformation coefficient and the deformation degree according to the deformation coefficient, and taking the deformation degree as the deformation degree of the transformer winding.
Optionally, the configuration process of the reference frequency band specifically includes:
acquiring an initial frequency point, a zero-crossing frequency point and an end frequency point of a phase-frequency curve of a reference frequency response sequence of the transformer winding;
and calculating the frequency range of the reference frequency band according to the starting frequency point, the zero-crossing frequency point and the termination frequency point based on a preset frequency calculation formula to obtain the corresponding reference frequency band.
Optionally, the zero-crossing frequency points specifically include a first zero-crossing frequency point, a second zero-crossing frequency point, a third zero-crossing frequency point, and a fourth zero-crossing frequency point;
the obtaining of the first zero-crossing frequency point, the second zero-crossing frequency point, the third zero-crossing frequency point, and the fourth zero-crossing frequency point of the phase-frequency curve of the reference frequency response sequence of the transformer winding specifically includes:
sequentially increasing the frequency based on the initial frequency point, and respectively recording the first two points where the phase-frequency curve and the horizontal axis intersect as the first zero-crossing frequency point and the second zero-crossing frequency point;
and sequentially reducing the frequency based on the termination frequency point, and recording the first two points of the intersection of the phase-frequency curve and the horizontal axis as the fourth zero-crossing frequency point and the third zero-crossing frequency point respectively.
Optionally, the number of the reference frequency bands is six;
the six reference frequency bands are respectively a first reference frequency band, a second reference frequency band, a third reference frequency band, a fourth reference frequency band, a fifth reference frequency band and a sixth reference frequency band;
based on a preset frequency calculation formula, calculating the frequency range of the reference frequency band according to the starting frequency point, the zero-crossing frequency point and the ending frequency point, and obtaining the corresponding reference frequency band specifically comprises:
and calculating the frequency range of the reference frequency band according to the starting frequency point, the zero-crossing frequency point and the termination frequency point based on the respective corresponding preset frequency calculation formulas of the six reference frequency bands to obtain the corresponding reference frequency bands.
Optionally, the preset frequency calculation formula corresponding to the first reference frequency band is:
in the formula (f)1For the frequency corresponding to the starting frequency point, fn1Corresponding to said first zero-crossing frequency point, P (f)n1) Is the phase value of the first zero-crossing frequency point, faIs the frequency range of the first frequency band, P (f)n1+1) And adding the phase value corresponding to 1 frequency point to the first zero-crossing frequency point.
Optionally, the preset frequency calculation formula corresponding to the second reference frequency band is:
in the formula (f)bIs the frequency range of the second frequency band, fn2Is the second point of cross-frequency, P (f)n2) Is the phase value of the second zero-crossing frequency point, P (f)n2+1) And the second zero-crossing frequency point is increased by 1 phase value corresponding to the frequency point.
Optionally, the preset deformation coefficient calculation formula includes:
in the formula (I), the compound is shown in the specification,
is the average of the sequence of magnitudes of the test frequency band,
is the average value of the amplitude sequence of the reference frequency band, M1(fi) The ith test amplitude of the amplitude sequence of the test frequency band is obtained; m0(fi) And the number is the ith reference amplitude of the amplitude sequence of the reference frequency band, R is a deformation coefficient, and n is the number of frequency points.
The present application provides in a second aspect a transformer winding deformation analysis apparatus, including:
the acquisition unit is used for acquiring a test frequency band and a reference frequency band of the transformer winding, wherein the configuration process of the reference frequency band is as follows: the method comprises the steps that a phase-frequency curve of a transformer winding reference frequency response sequence is segmented based on an initial frequency point, a zero-crossing frequency point and a termination frequency point of the phase-frequency curve;
the calculation unit is used for calculating and obtaining the deformation coefficient of the transformer winding according to the test frequency band and the reference frequency band based on a preset deformation coefficient calculation formula;
and the analysis unit is used for obtaining the deformation degree corresponding to the deformation coefficient according to the deformation coefficient and based on the corresponding relation between the deformation coefficient and the deformation degree, and taking the deformation degree as the deformation degree of the transformer.
A third aspect of the present application provides a transformer winding deformation analysis apparatus, including a processor and a memory;
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute the transformer winding deformation analysis method according to the first aspect according to instructions in the program code.
A fourth aspect of the present application provides a storage medium for storing program code for performing the transformer winding deformation analysis method of the first aspect.
According to the technical scheme, the embodiment of the application has the following advantages:
the inventor finds that the winding mode and the capacity of the transformer winding have great influence on the frequency response when researching the prior art, and corresponding fault frequency bands can be different even under the same fault type. If the fixed frequency division method is adopted to analyze the deformation of the transformer, the deformation analysis of different transformer windings has larger difference due to different winding structure types and capacities of different transformers, so that the deformation degree of the transformer windings cannot be accurately analyzed.
The application provides a transformer winding deformation analysis method, firstly obtaining a test frequency band and a reference frequency band of a transformer winding, then obtaining a deformation coefficient of the transformer winding by calculation according to the test frequency band and the reference frequency band based on a preset deformation coefficient calculation formula, then obtaining a corresponding transformation degree of the deformation coefficient according to the corresponding relation due to the corresponding relation between the deformation coefficient and the deformation degree, wherein the deformation degree is the deformation degree of the transformer winding, in the analysis process, the reference frequency band is obtained by segmenting a phase-frequency curve through an initial frequency point, a zero-crossing frequency point and an end frequency point of the phase-frequency curve of a transformer winding reference frequency response sequence, and the initial frequency point, the zero-crossing frequency point and the end frequency point corresponding to different phase-frequency curves are different phase-frequency curves, the points for dividing the reference frequency band are different according to different phase-frequency curves, the reference frequency band obtained after segmentation is different according to the phase-frequency curve (namely the transformer winding), the segmentation of the different phase-frequency curves is different, and compared with the fixed segmentation in the prior art, the transformer winding deformation analysis method can divide the corresponding frequency band according to the characteristics of the different transformer windings, so that the technical problem that the deformation analysis of the different transformer windings has larger difference due to different winding structures and capacities of different transformers when the transformer windings are analyzed in the prior art is solved, and the deformation degree of the transformer windings cannot be accurately analyzed.
Drawings
Fig. 1 is a schematic flow chart of a first embodiment of a transformer winding deformation analysis method according to an embodiment of the present application;
fig. 2 is a schematic flow chart of a transformer winding deformation analysis method according to a second embodiment of the present application;
fig. 3 is a schematic structural diagram of a transformer winding deformation analysis apparatus in an embodiment of the present application.
Detailed Description
The embodiment of the application provides a transformer winding deformation analysis method, a transformer winding deformation analysis device, transformer winding deformation analysis equipment and a storage medium, and solves the technical problem that when transformer windings are analyzed, due to the fact that the winding structure types and the capacities of different transformers are different, deformation analysis of different transformer windings has large difference, and therefore the deformation degree of the transformer windings cannot be accurately analyzed.
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, a schematic flow chart of a transformer winding deformation analysis method according to a first embodiment of the present application is shown.
The acquisition of the test frequency band can be obtained by testing the frequency response sequence of the transformer winding through a frequency tester.
It should be noted that an amplitude-frequency curve and a phase-frequency curve can be obtained through a frequency response sequence of a transformer winding, and researches show that a zero-crossing frequency point usually indicates sudden changes of the capacitance and the inductance of a system, and also indicates that sudden changes occur due to the influence of different parameters, so that the zero-crossing frequency point can be used for frequency band division of the phase-frequency curve of the transformer winding.
102, calculating the deformation coefficient of the transformer winding according to the test frequency band and the reference frequency band based on a preset deformation coefficient calculation formula.
It can be understood that the preset deformation coefficient calculation formula is a transformer winding correlation coefficient formula, and the deformation coefficients of the transformer winding in each reference frequency band are obtained through the average value of the amplitudes of the frequency response sequences corresponding to the test frequency band and the reference frequency band based on the deformation coefficient calculation formula.
And 103, obtaining the deformation degree corresponding to the deformation coefficient based on the corresponding relation between the deformation coefficient and the deformation degree according to the deformation coefficient, and taking the deformation degree as the deformation degree of the transformer winding.
And obtaining the deformation degree of the transformer winding in each reference frequency band by analyzing the corresponding relation between the deformation coefficient and the deformation degree in each reference frequency band. It is understood that the deformation coefficients obtained through step 102 are multiple, and one deformation coefficient corresponds to one deformation degree, and that there may be multiple deformation degrees, and these deformation degrees may be for different fault types of the transformer winding, that is, multiple types of fault types may exist in one transformer winding at the same time, that is, the deformation degree types, for example, a severe turn-to-turn short circuit fault, a severe distortion and bulge deformation fault, a severe overall displacement fault may exist in the transformer winding at the same time, and may also be one of the above three deformation types.
The first embodiment of the method for analyzing the deformation of the transformer winding is that a starting frequency point, a zero-crossing frequency point and an ending frequency point of a phase-frequency curve of a reference frequency response sequence of the transformer winding are obtained, the phase zero-crossing frequency point usually indicates capacitive and inductive sudden changes of the transformer winding and also indicates sudden changes of different parameters, the phase-frequency curve of the reference frequency response sequence is segmented by using the starting frequency point, the zero-crossing frequency point and the ending frequency point to obtain a reference frequency band, a frequency range of the reference frequency band is obtained by calculation based on a preset deformation coefficient calculation formula, a deformation coefficient of the reference frequency band is obtained by the deformation coefficient calculation formula, and the deformation degree of the transformer winding is obtained by analysis based on a corresponding relation between the deformation coefficient and the deformation degree. The method and the device have the advantages that corresponding frequency division band deformation analysis is carried out on different transformer windings, the deformation degrees of the different transformer windings can be accurately analyzed, and the technical problem that the deformation degrees of the transformer windings cannot be accurately analyzed due to the fact that the deformation analysis of the different transformer windings has large differences due to different winding structures and capacities of different transformers in the process of analyzing the transformer windings in the prior art is solved.
The above is a first embodiment of a transformer winding deformation analysis method provided by the embodiments of the present application, and the following is a second embodiment of the transformer winding deformation analysis method provided by the embodiments of the present application.
Referring to fig. 2, a flow chart of a transformer winding deformation analysis method according to a second embodiment of the present application is shown.
It should be noted that, the frequency response sequence of the transformer winding may be tested by the frequency tester, so as to obtain the test frequency band of the transformer winding.
It should be noted that, a frequency response sequence of the transformer winding when leaving the factory is obtained, a phase-frequency curve of the transformer winding is obtained according to the response frequency sequence, and a start point of the phase-frequency curve is defined as a start frequency point and an end point is defined as an end frequency point.
And 203, sequentially increasing the frequency based on the initial frequency point, recording the first two points of the intersection of the phase-frequency curve and the transverse axis as a first zero-crossing frequency point and a second zero-crossing frequency point respectively, sequentially decreasing the frequency based on the termination frequency point, and recording the first two points of the intersection of the phase-frequency curve and the transverse axis as a fourth zero-crossing frequency point and a third zero-crossing frequency point respectively.
It should be noted that, in the research, the inventor finds that the frequency is sequentially increased from the starting point and the stopping point of the phase frequency curve, and when the frequency curve crosses zero for the first time and the second time; and reducing the frequency from the end frequency point of the phase-frequency curve, wherein when the frequency curve passes through the zero frequency points for the first time and the second time, the four zero-crossing frequency points are suitable to be used as points for dividing the frequency response sequence when the transformer winding leaves the factory.
And 204, calculating the frequency range of the reference frequency band according to the starting frequency point, the zero-crossing frequency point and the termination frequency point based on the preset frequency calculation formulas corresponding to the six reference frequency bands respectively to obtain the corresponding reference frequency bands.
Assuming that the initial frequency point of the frequency response sequence when the transformer winding leaves the factory is f1The obtained four zero-crossing frequency points are respectively the first zero-crossing frequency point fn1Second zero-crossing frequency point fn2A third zero-crossing frequency point fn3Fourth zero-crossing frequency point fn4The termination frequency point is f1000。
Then, the preset frequency calculation formulas corresponding to the six reference frequency bands are respectively:
in the formula (f)aIs the frequency range of the first frequency band, f1For the frequency corresponding to the starting frequency point, fn1Frequency corresponding to the first zero-crossing frequency point, P (f)n1) Is the phase value of the first zero-crossing frequency point, P (f)n1+1) And adding the phase value corresponding to 1 frequency point to the first zero-crossing frequency point.
In addition, f isaComprises the following steps: according to the starting frequency point of f1And a first zero-crossing frequency point fn1Based on the calculation formula (1), the frequency range of one frequency band is calculated.
In the formula (f)bFrequency range of b frequency bandGo round, fn2Is the second zero-crossing frequency point, P (f)n2) Is the phase value of the second zero-crossing frequency point, P (f)n2+1) And adding the phase value corresponding to 1 frequency point to the second zero-crossing frequency point.
In addition, f isbComprises the following steps: according to the first zero-crossing frequency point fn1And a second zero-crossing frequency point fn2And (4) calculating the obtained frequency range of one frequency band based on the calculation formula (2).
In the formula (f)cFrequency range of the third frequency band, fn3Is the third passing frequency point, P (f)n3) Is the phase value of the third zero-crossing frequency point, P (f)n3-1) And reducing the phase value corresponding to 1 frequency point for the third zero-crossing frequency point.
In addition, f iscComprises the following steps: according to the second zero-crossing frequency point fn2And a third zero-crossing frequency point fn3Based on the calculation formula (3), the frequency range of one frequency band is calculated.
In the formula (f)dFrequency range of the fourth frequency band, fn4Is the fourth passing frequency point, P (f)n4) Is the phase value of the fourth zero-crossing frequency point, P (f)n4-1) The fourth zero crossing frequency point is increased by the phase value corresponding to 1 frequency point.
In addition, f isdComprises the following steps: according to a third zero-crossing frequency point fn3And a fourth zero-crossing frequency point fn4And (4) calculating the obtained frequency range of one frequency band based on the calculation formula (4).
In the formula (f)eFrequency range of the fifth frequency band。，f1000Is the termination frequency point.
In addition, f iseComprises the following steps: according to a fourth zero-crossing frequency point fn4And a termination frequency point f1000Based on the calculation formula (5), the frequency range of one frequency band is calculated.
In the formula (f)fA frequency range of a sixth frequency band.
In addition, f isfComprises the following steps: according to a fourth zero-crossing frequency point fn4And a termination frequency point f1000Based on the calculation formula (6), a frequency range is calculated.
And dividing the phase-frequency curve of the frequency response sequence of the transformer winding when leaving the factory into six frequency bands by the calculation formula, and obtaining the specific frequency ranges of the six frequency bands.
And step 205, calculating the deformation coefficient of the transformer winding according to the test frequency band and the reference frequency band based on a preset deformation coefficient calculation formula.
It can be understood that the average value of the amplitudes corresponding to each test frequency band and each reference frequency band of the transformer winding is calculated to obtain the deformation coefficient of the transformer winding in each reference frequency band based on a deformation coefficient calculation formula.
The deformation coefficient calculation formula is as follows:
in the formula (I), the compound is shown in the specification,
to be the average of the sequence of magnitudes of the test frequency band,
is the average of the amplitude sequence of the reference frequency band, M1(fi) For the ith test frame of the amplitude sequence of the test frequency bandA value; m0(fi) Is the ith reference amplitude of the amplitude sequence of the reference frequency band, R is the deformation coefficient, and n is the number of frequency points.
And step 206, obtaining the deformation degree corresponding to the deformation coefficient according to the deformation coefficient and based on the corresponding relation between the deformation coefficient and the deformation degree, and taking the deformation degree as the deformation degree of the transformer winding.
The deformation relationship of the transformer winding in each reference frequency band is obtained by analyzing the corresponding relationship between the deformation coefficient and the deformation degree in each reference frequency band, and it should be noted that one transformer winding can have multiple types of fault types, that is, the types of the deformation degrees, at the same time.
If the deformation coefficient is more than or equal to 0.9 and less than or equal to 0.95 in the low frequency band, the winding is indicated to have slight turn-to-turn short circuit fault; if R < 0.9, the winding may have a severe turn-to-turn short fault.
If the distortion coefficient is more than or equal to 0.9 and less than or equal to 0.95 in the middle frequency band, the winding is possibly slightly distorted and bulges; if R < 0.9, the winding may have severe distortion and bulge distortion failures.
If the deformation coefficient is more than or equal to 0.9 and less than or equal to R and less than or equal to 0.95 in the high frequency band, the winding is possible to have serious integral displacement fault, and if R is less than 0.9, the winding is possible to have serious integral displacement fault.
The application provides a second embodiment of a transformer winding deformation analysis method, which divides the frequency of a transformer winding into six specific reference frequency bands based on a preset frequency calculation formula according to the phase-frequency curve, the initial frequency point, the zero-crossing frequency point and the end frequency point of a frequency response sequence when the transformer winding leaves a factory, respectively calculates the deformation coefficients of the six reference frequency bands based on the preset deformation coefficient formula according to the corresponding amplitudes of a test frequency band and the reference frequency band, and obtains the deformation degree of the transformer winding according to the corresponding relation between the deformation coefficients and the deformation degrees, and the embodiment performs corresponding sub-band deformation analysis on different transformer windings, thereby solving the problem that the deformation analysis of different transformer windings has larger difference due to different winding structures and capacities of different transformers in the prior art, thereby the technical problem of transformer winding deformation degree can not be accurately analyzed.
The above is a second embodiment of the transformer winding deformation analysis method provided in the embodiments of the present application, and the following is an embodiment of a transformer winding deformation analysis device provided in the embodiments of the present application, and refer to fig. 3 specifically.
In this embodiment, an apparatus for analyzing transformer winding deformation includes:
the acquisition unit 301 is configured to acquire a test frequency band and a reference frequency band of a transformer winding, where a configuration process of the reference frequency band is as follows: the method comprises the steps that a phase-frequency curve is segmented based on an initial frequency point, a zero-crossing frequency point and a termination frequency point of the phase-frequency curve of a reference frequency response sequence of a transformer winding;
the calculating unit 302 is configured to calculate a deformation coefficient of the transformer winding according to the test frequency band and the reference frequency band based on a preset deformation coefficient calculation formula;
and an analyzing unit 303, configured to obtain a deformation degree corresponding to the deformation coefficient based on the correspondence between the deformation coefficient and the deformation degree according to the deformation coefficient, and use the deformation degree as the deformation degree of the transformer.
In this embodiment, corresponding sub-band deformation analysis is performed on different transformer windings, so that the deformation degrees of the different transformer windings can be accurately analyzed, and the technical problem that the deformation degrees of the transformer windings cannot be accurately analyzed due to the fact that the deformation analysis of the different transformer windings has large differences because the winding structures and the capacities of the different transformers are different in the analysis of the transformer windings in the prior art is solved.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
The embodiment of the application also provides transformer winding deformation analysis equipment, which comprises a processor and a memory; the memory is used for storing the program codes and transmitting the program codes to the processor; the processor is configured to perform the optimization method of the first embodiment or the second embodiment according to instructions in the program code.
The embodiment of the present application further provides a storage medium, wherein the storage medium is used for storing a program code, and the program code is used for executing the optimization method of the first embodiment or the second embodiment.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described device embodiments are merely illustrative, and for example, the division of the units is only one logical functional division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another grid network to be installed, or some features may be omitted or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. A transformer winding deformation analysis method is characterized by comprising the following steps:
acquiring a test frequency band and a reference frequency band of a transformer winding, wherein the configuration process of the reference frequency band comprises the following steps: segmenting the phase-frequency curve to obtain the reference frequency band based on the initial frequency point, the zero-crossing frequency point and the termination frequency point of the phase-frequency curve of the reference frequency response sequence of the transformer winding;
calculating to obtain the deformation coefficient of the transformer winding according to the test frequency band and the reference frequency band based on a preset deformation coefficient calculation formula;
and obtaining the deformation degree corresponding to the deformation coefficient based on the corresponding relation between the deformation coefficient and the deformation degree according to the deformation coefficient, and taking the deformation degree as the deformation degree of the transformer winding.
2. The transformer winding deformation analysis method according to claim 1, wherein the configuration process of the reference frequency band specifically comprises:
acquiring an initial frequency point, a zero-crossing frequency point and an end frequency point of a phase-frequency curve of a reference frequency response sequence of the transformer winding;
and calculating the frequency range of the reference frequency band according to the starting frequency point, the zero-crossing frequency point and the termination frequency point based on a preset frequency calculation formula to obtain the reference frequency band.
3. The transformer winding deformation analysis method according to claim 2, wherein the zero-crossing frequency points specifically include a first zero-crossing frequency point, a second zero-crossing frequency point, a third zero-crossing frequency point, and a fourth zero-crossing frequency point;
the obtaining of the first zero-crossing frequency point, the second zero-crossing frequency point, the third zero-crossing frequency point, and the fourth zero-crossing frequency point of the phase-frequency curve of the reference frequency response sequence of the transformer winding specifically includes:
sequentially increasing the frequency based on the initial frequency point, and respectively recording the first two points where the phase-frequency curve and the horizontal axis intersect as the first zero-crossing frequency point and the second zero-crossing frequency point;
and sequentially reducing the frequency based on the termination frequency point, and recording the first two points of the intersection of the phase-frequency curve and the horizontal axis as the fourth zero-crossing frequency point and the third zero-crossing frequency point respectively.
4. The transformer winding deformation analysis method according to claim 3, characterized in that the number of the reference frequency bands is six;
the six reference frequency bands are respectively a first reference frequency band, a second reference frequency band, a third reference frequency band, a fourth reference frequency band, a fifth reference frequency band and a sixth reference frequency band;
based on a preset frequency calculation formula, calculating the frequency range of the reference frequency band according to the starting frequency point, the zero-crossing frequency point and the ending frequency point, and obtaining the corresponding reference frequency band specifically comprises:
and calculating the frequency range of the reference frequency band according to the starting frequency point, the zero-crossing frequency point and the termination frequency point based on the respective corresponding preset frequency calculation formulas of the six reference frequency bands to obtain the corresponding reference frequency bands.
5. The transformer winding deformation analysis method according to claim 4, wherein the preset frequency calculation formula corresponding to the first reference frequency band is as follows:
in the formula (f)1For the frequency corresponding to the starting frequency point, fn1For the frequency corresponding to the first zero-crossing frequency point, P (f)n1) Is the phase value of the first zero-crossing frequency point, faIs the frequency range of the first frequency band, P (f)n1+1) And adding the phase value corresponding to 1 frequency point to the first zero-crossing frequency point.
6. The transformer winding deformation analysis method according to claim 5, wherein the preset frequency calculation formula corresponding to the second reference frequency band is as follows:
in the formula (f)bIs the frequency range of the second frequency band, fn2Is the second point of cross-frequency, P (f)n2) Is the phase value of the second zero-crossing frequency point, P (f)n2+1) And adding the phase value corresponding to 1 frequency point to the second zero-crossing frequency point.
7. The transformer winding deformation analysis method according to claim 1, wherein the preset deformation coefficient calculation formula comprises:
in the formula (I), the compound is shown in the specification,
is the average of the sequence of magnitudes of the test frequency band,
is the average value of the amplitude sequence of the reference frequency band, M1(fi) The ith test amplitude of the amplitude sequence of the test frequency band is obtained; m0(fi) And the number is the ith reference amplitude of the amplitude sequence of the reference frequency band, R is a deformation coefficient, and n is the number of frequency points.
8. A transformer winding deformation analysis device, comprising:
the acquisition unit is used for acquiring a test frequency band and a reference frequency band of the transformer winding, wherein the configuration process of the reference frequency band is as follows: the method comprises the steps that a phase-frequency curve of a transformer winding reference frequency response sequence is segmented based on an initial frequency point, a zero-crossing frequency point and a termination frequency point of the phase-frequency curve;
the calculation unit is used for calculating and obtaining the deformation coefficient of the transformer winding according to the test frequency band and the reference frequency band based on a preset deformation coefficient calculation formula;
and the analysis unit is used for obtaining the deformation degree corresponding to the deformation coefficient according to the deformation coefficient and based on the corresponding relation between the deformation coefficient and the deformation degree, and taking the deformation degree as the deformation degree of the transformer.
9. The transformer winding deformation analysis equipment is characterized by comprising a processor and a memory;
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute the transformer winding deformation analysis method according to any one of claims 1 to 7 according to instructions in the program code.
10. A storage medium for storing program code for performing the transformer winding deformation analysis method of any one of claims 1 to 7.
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