CN110030920B - Method and device for testing deformation of transformer winding and storage medium - Google Patents
Method and device for testing deformation of transformer winding and storage medium Download PDFInfo
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Abstract
The embodiment of the application relates to a method and a device for testing transformer winding deformation and a storage medium, so as to conveniently and accurately determine whether the transformer winding deformation exists or not and determine the deformation degree of the transformer when the winding deformation exists. The test method comprises the following steps: determining the capacitance of each winding after being grounded relative to the other two windings; determining a capacitance change rate corresponding to each winding based on the capacitance; and determining the deformation conditions of the middle winding and the inner winding based on the capacitance change rate.
Description
Technical Field
The embodiment of the application relates to the technical field of power engineering, in particular to a method and a device for testing transformer winding deformation and a storage medium.
Background
When the power transformer is subjected to short-circuit impact, the radial leakage flux is smaller than the axial leakage flux, the radial electrodynamic force is dominant, the instantaneous current directions of the high-voltage and low-voltage windings are opposite, the outer side winding is under tension, the inner side winding is under repulsion, and the area of a main leakage magnetic air channel between the windings is always increased. However, the current of the low-voltage winding is usually several times that of the high-voltage winding, the electromagnetic force borne by the low-voltage winding is several ten times to hundreds times that of the high-voltage winding, and the specified non-proportional extension strength (Rp0.2) difference of the high-voltage winding and the low-voltage winding is generally not more than 100%, so the radial deformation of the low-voltage winding is the main mode of the deformation of the power transformer winding.
In the prior art, a winding frequency response analysis method, a low-voltage short-circuit impedance method, an electric capacity method and the like are commonly used for judging the radial deformation of a power transformer winding. The winding frequency response analysis method and the low-voltage short-circuit impedance method have corresponding industry standards for analysis and judgment, namely DL/T911 frequency response analysis method for winding deformation of a power transformer and DL/T1093 reactance method detection judgment guide rule for winding deformation of the power transformer.
The frequency response analysis method is characterized in that under the action of voltage with higher frequency, each winding of the power transformer can be regarded as a passive linear double-port network formed by distributed parameters such as linear resistance, inductance (mutual inductance) and capacitance, and the internal characteristics of the passive linear double-port network can be described by a transfer function H (j omega). If the winding is deformed, parameters such as distributed inductance and capacitance inside the winding are inevitably changed, so that the zero point and the pole of the equivalent network transfer function H (j omega) are changed, and the frequency response characteristic of the network is changed. The frequency band range related to the frequency response analysis method is specified to be 1 kHz-1000 kHz in the national standard DL/T911. The frequency response analysis method usually adopts a longitudinal comparison mode and a transverse comparison mode, the longitudinal comparison mode has higher sensitivity, but the original amplitude-frequency response characteristic of the transformer needs to be obtained in advance, the influence caused by the change of the detection condition and the detection mode needs to be eliminated, and the field application is difficult. The transverse comparison mode compares the amplitude-frequency response characteristics of the three-phase windings of the transformer at the same voltage level, so that the field application is more convenient, but the possibility that the three-phase windings of the power transformer are deformed to the similar degree or the amplitude-frequency response characteristics of the three-phase windings of the normal transformer are different needs to be eliminated, and misjudgment is easy to occur in field judgment.
The low-voltage short-circuit impedance method is convenient to implement on site, but has low sensitivity, and can not accurately judge which winding is deformed.
The capacitance method in the prior art is the analysis of the capacitance change of the winding of the deformed power transformer winding, and the winding deformation condition is not quantitatively analyzed.
In view of the above, a method is needed that can be conveniently implemented on site and can accurately determine whether or not a power transformer winding is deformed and the degree of deformation.
Disclosure of Invention
In order to solve the problems in the prior art, at least one embodiment of the present application provides a method and an apparatus for testing transformer winding deformation, and a storage medium, so as to determine whether the power transformer winding deformation and the deformation degree of the power transformer winding deformation are more convenient and accurate.
In a first aspect, the present application provides a method for testing deformation of a transformer winding, the transformer including an outer winding, a middle winding, and an inner winding, the method including:
determining the capacitance of each winding after being grounded relative to the other two windings;
determining a capacitance change rate corresponding to each winding based on the capacitance;
and determining the deformation conditions of the middle winding and the inner winding based on the capacitance change rate.
In a second aspect, an embodiment of the present application provides a device for testing deformation of a transformer winding, including:
the capacitance testing module is configured to determine the capacitance of each winding after being grounded relative to the other two windings;
a capacitance change rate determination module configured to determine a capacitance change rate corresponding to each winding based on the capacitance;
and the deformation evaluation module is configured to determine the deformation conditions of the middle winding and the inner winding based on the capacitance change rate.
In a third aspect, embodiments of the present application provide a non-transitory computer-readable storage medium storing computer instructions that cause a computer to perform the method as described above.
In the embodiment of the application, whether the transformer winding (especially the middle winding and the inner winding) is deformed or not and the deformation degree are determined through the capacitance change between the adjacent windings, so that the field implementation is convenient and the accuracy is high.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic longitudinal sectional view of a transformer according to an embodiment of the present disclosure;
fig. 2 is a flowchart of a method for testing deformation of a transformer winding according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram illustrating a variation law between capacitance variation and winding deformation according to an embodiment of the present disclosure;
fig. 4 is a schematic diagram of a device for testing deformation of a transformer winding according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, 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 some embodiments of the present application, but not all 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.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
The transformer referred to in the present application may include an outer winding, a middle winding, an inner winding, and a core, and a schematic diagram of a longitudinal section thereof is shown in fig. 1, and capacitance distribution among the windings is shown as C1, C2, and C3. Wherein the inner and outer diameters of each winding are R as shown in the figureW3Outer, RW2Inner and RW2Outer sum RW1And (4) the following steps. For a three-winding transformer, winding deformation may be as follows: one is that the middle winding is the winding that is most easily deformed, and if the middle group is deformed, the inner winding may also be deformed due to the extrusion of the middle winding, especially when the middle winding is significantly deformed; another situation is that the middle winding is not deformed and only the inner winding is deformed. The method for testing the deformation of the transformer winding can be applied to the two situations.
In a first aspect, the present application provides a method for testing deformation of a transformer winding, the transformer including an outer winding, a middle winding and an inner winding, the method as shown in fig. 2, including:
the capacitance of each winding is determined 201 relative to the other two windings after grounding.
Based on the capacitance, the rate of change of capacitance for each winding is determined 202.
And 203, determining the deformation conditions of the middle winding and the inner winding based on the capacitance change rate.
In one possible embodiment, the capacitance comprises:
the external winding has a first capacitance relative to the middle winding, the internal winding and the ground;
the middle winding has a second capacitance relative to the outer winding, the inner winding and the ground;
the inner winding has a third capacitance relative to the middle winding, the outer winding and ground.
In the embodiment of the present application, the first capacitance is represented by Cw1Expressed as C, the second capacitancew2The third capacitance is represented by Cw3And (4) showing.
In one possible embodiment, for step 201, there may be implemented the following specific manner, including:
the external winding is short-circuited end to end, the middle winding is short-circuited end to end and grounded, the internal winding is short-circuited end to end and grounded, the iron core of the transformer is grounded, and the first capacitance C is determined in a reverse wiring modew1；
The middle winding is short-circuited end to end, the external winding is short-circuited end to end and grounded, the internal winding is short-circuited end to end and grounded, the iron core of the transformer is grounded, and the second capacitance C is determined in a reverse connection modew2；
The internal winding is short-circuited end to end, the external winding is short-circuited end to end and grounded, the middle winding is short-circuited end to end and grounded, the iron core of the transformer is grounded, and the third capacitance C is determined in a reverse wiring modew3。
In embodiments of the present application, the rate of change of capacitance may include a first change in response to the external windingRate Δ Cw1Second rate of change Δ C corresponding to the middle windingw2Third rate of change Δ C corresponding to inner windingw3。
In step 202, C may be applied according to the first capacitancew1Second capacitance of Cw2Third capacitance with Cw3Determining a first rate of change Δ Cw1Second rate of change Δ Cw2Third rate of change Δ Cw3The method comprises the following steps:
first rate of change Δ Cw1Determined by the following formula:
ΔCw1＝(Cw1-Cw2)/Cw2×100 (1)
second rate of change Δ Cw2Determined by the following formula:
ΔCw2＝(Cw2-Cw1)/Cw1×100 (2)
third rate of change Δ Cw3Determined by the following formula:
ΔCw3＝(Cw3-Cw2)/Cw2×100 (3)
in step 203, the first rate of change Δ C is determined based on step 202w1Second rate of change Δ Cw2Third rate of change Δ Cw3The deformation conditions of the middle winding and the inner winding can be judged, specifically:
determining that the middle winding is deformed, and meeting the following conditions:
first rate of change Δ Cw1Less than or equal to a first threshold;
second rate of change Δ Cw2Greater than or equal to the second threshold.
Determining that the inner winding is deformed, and satisfying the following conditions:
second rate of change Δ Cw2Less than or equal to a third threshold;
third rate of change Δ Cw3Greater than or equal to a fourth threshold.
In the embodiment of the application, the first threshold, the second threshold, the third threshold, and the fourth threshold may be set according to theoretical data, may also be set according to historical data, or may be modified according to actual conditions, so as to have general applicability. Of course, for some application scenarios with more primary accuracy requirements, the first threshold, the second threshold, the third threshold, and the fourth threshold may be determined in other manners, but the test method for determining the deformation of the transformer is still within the protection scope of the present application.
In the embodiment of the application, on the basis of determining the deformation of the middle winding and the inner winding, the second change rate Δ C can be further determinedw2And a third rate of change Δ Cw3The deformation levels of the middle and inner windings, respectively, are determined, which may include the presence of visible deformation, significant deformation, and severe deformation.
In one possible implementation, the second rate of change Δ C may be based onw2Determining the deformation degree of the middle winding within the preset threshold range; and, based on the third rate of change Δ Cw3And determining the deformation degree of the middle winding within the preset threshold range. It should be noted that the preset threshold range may have different ranges according to different windings, may be set according to theoretical data, may also be set according to historical data, or may be modified according to actual situations.
For a clearer understanding of the present application, specific modifications and determinations of the degree of modification are described. Assuming that the first capacitance C has been testedw1A second capacitance Cw2And a third capacitance Cw3(ii) a And determines the first rate of change deltac based on the above-mentioned capacitance and equations (1) -3w1A second rate of change Δ Cw2And a third rate of change Δ Cw3. And the first threshold value is set to be-1.5%, the second threshold value is set to be 3%, the third threshold value is set to be-1.5% and the fourth threshold value is set to be 2% based on the theoretical data.
Specifically, when the winding is determined to be deformed, the condition for judging the deformation of the middle winding is as follows:
ΔCw1≤-1.5％；
ΔCw2≥3％。
ΔCw1≤-1.5％，ΔCw2more than or equal to 3 percent, the middle part is woundThe set deforms.
The conditions for determining the deformation of the inner winding are as follows:
ΔCw2≤-1.5％；
ΔCw3≥2％。
ΔCw2≤-1.5％，ΔCw3and more than or equal to 2 percent of the total weight is satisfied, the internal winding deforms.
Assuming that a preset threshold range for determining the deformation degree is available, when the deformation degree of the winding is specifically determined, the deformation degree of the middle winding is judged as follows:
3％≤ΔCw2<4%, visible deformation exists in the winding W2;
4％≤ΔCw2<6%, then there is significant deformation of the W2 winding;
6％≤ΔCw2then there is severe deformation of the W2 winding.
The deformation degree of the inner winding is judged as follows:
2％≤ΔCw3if the winding is less than 3%, visible deformation exists in the winding W3;
3％≤ΔCw3if the winding is less than 5%, the winding W3 is deformed obviously;
5％≤ΔCw3the W3 winding is severely deformed.
And determining the winding deformation based on the original radius data and the capacitance change rate of the transformer, wherein the winding capacitance change and the winding deformation have a spiral change trend.
As shown in fig. 3, a 180000kVA three-winding transformer is taken as an example, wherein the winding in the transformer deforms, and the change rule between the capacitance change and the winding deformation conforms to the "spiral change trend between the winding capacitance change and the winding deformation". The concrete description is as follows: let R2/R1 be K constant, R2 be the radius of the middle winding of the transformer, R1 be the radius of the outer winding of the transformer, and for a new transformer, K is fixed, and when the winding is short-circuited and impacted, the winding will deform radially or axially, and the capacitance formula can be as follows:
CWW＝(17.7πW H)/Ln(R2/R1)÷1000 (4)
in actual detection, most transformers are subjected to radial deformation according to the situation of disassembling the transformers, so that H, B, C,Wremain unchanged. The rate of change in capacitance is:
△C＝(C2-C1)/C1 (5)
assuming that R1 is not deformed, X is the deformation amount of the radius R2 of the middle winding of the transformer, X is (R2'-R2)/R2, and R2' is the radius of the deformed middle winding, the following formula can be derived:
R2'＝(X+1)R2 (6)
C2＝(17.7πW H)/Ln(R2'/R1)÷1000 (7)
C1＝(17.7πW H)/Ln(R2/R1)÷1000 (8)
△C＝Ln(R2/R1)/Ln(R2'/R1)-1 (9)
(△C+1)Ln((X+1)K)＝LnK (10)
(X+1)K＝K1/(△C+1) (11)
X＝K(1/(△C+1)-1)-1 (12)
from the above formula, the relationship between the winding variation and the capacitance variation is an exponential function.
According to the three-winding transformer structure: if K is 1.333, the curve relation function or formula: x is 1.333(1 /(△C+1)-1)1, according to the spiral change trend between the change of the winding capacitance and the deformation of the winding.
It should be noted that, the specific value of the preset threshold range in the embodiment is only for clearer description, and may be set or adjusted according to different transformers or according to different requirements, and the application is not limited thereto.
In the embodiment of the application, whether the transformer winding (especially the middle winding and the inner winding) is deformed or not and the deformation degree are determined through the capacitance change between the adjacent windings, so that the field implementation is convenient and the accuracy is high.
In a second aspect, an embodiment of the present application provides a device for testing deformation of a transformer winding, as shown in fig. 4, including:
a capacitance test module 401 configured to determine the capacitance of each winding after being grounded with respect to the other two windings;
a capacitance change rate determination module 402 configured to determine a capacitance change rate corresponding to each winding based on the capacitance;
a deformation evaluation module 403 configured to determine deformation of the middle winding and the inner winding based on the rate of change of capacitance.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described apparatuses and modules may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In a third aspect, embodiments of the present application provide a non-transitory computer-readable storage medium storing computer instructions, where the computer instructions cause a computer to execute the method for testing deformation of a transformer winding.
Those of ordinary skill in the art will appreciate that the various illustrative modules and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiments provided in the present application, it should be understood that the execution sequence of the steps of the method embodiments can be arbitrarily adjusted unless there is an explicit precedence sequence. The disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the modules is merely a logical division, and in actual implementation, there may be other divisions, for example, multiple modules or components may be combined or integrated into another system, or some features may be omitted, or not implemented. 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 modules, and may be in an electrical, mechanical or other form.
In addition, functional modules in the embodiments of the present application may be integrated into one processing module, or each of the modules may exist alone physically, or two or more modules are integrated into one module.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the embodiments of the present application may be essentially implemented or make a contribution to the prior art, or may be implemented in the form of a software product stored in a storage medium and including several 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 methods described in the embodiments of the present application.
It should be noted that, in this document, 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 an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Those skilled in the art will appreciate that although some embodiments described herein include some features included in other embodiments instead of others, combinations of features of different embodiments are meant to be within the scope of the application and form different embodiments.
Although the embodiments of the present application have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations fall within the scope defined by the appended claims.
Claims (7)
1. A method for testing the deformation of a transformer winding, wherein the transformer comprises an outer winding, a middle winding and an inner winding, and the method is characterized by comprising the following steps:
determining the capacitance of each winding after being grounded relative to the other two windings; wherein the capacitance includes:
a first capacitance C of the external winding relative to the middle winding, the internal winding and the groundw1；
Second capacitance C of the middle winding relative to the outer winding, the inner winding and the groundw2；
Third capacitance C of the inner winding relative to the middle winding, the outer winding and the groundw3；
Determining a capacitance change rate corresponding to each winding based on the capacitance; wherein the rate of change in capacitance comprises:
first rate of change Δ C for the outer windingw1Wherein, Δ Cw1＝(Cw1-Cw2)/Cw2×100；
Second rate of change Δ C corresponding to the middle windingw2Wherein, Δ Cw2＝(Cw2-Cw1)/Cw1×100；
Third rate of change Δ C for inner windingw3Wherein, Δ Cw3＝(Cw3-Cw2)/Cw2×100；
Determining deformation conditions of the middle winding and the inner winding based on the capacitance change rate; determining the deformation degree of the middle winding based on the preset threshold range of the second change rate; and determining the deformation degree of the middle winding based on the preset threshold range of the third change rate.
2. The method of claim 1, wherein determining the capacitance of each winding after grounding with respect to the other two windings comprises:
the method comprises the following steps of short-circuiting the head and the tail of an external winding, short-circuiting the head and the tail of a middle winding and grounding, short-circuiting the head and the tail of an internal winding and grounding, grounding an iron core of a transformer, and determining the first capacitance in a reverse wiring mode;
the middle winding is short-circuited end to end, the external winding is short-circuited end to end and grounded, the internal winding is short-circuited end to end and grounded, the iron core of the transformer is grounded, and the second capacitance is determined in a reverse wiring mode;
and short-circuiting the head and the tail of the internal winding, short-circuiting the head and the tail of the external winding and grounding, short-circuiting the head and the tail of the middle winding and grounding, grounding the iron core of the transformer, and determining the third capacitance in a reverse wiring mode.
3. The test method according to claim 1, wherein it is determined that the middle winding is deformed, and the following condition is satisfied:
the first rate of change is less than or equal to a first threshold;
the second rate of change is greater than or equal to a second threshold.
4. The test method according to claim 1, wherein it is determined that the inner winding is deformed, and the following condition is satisfied:
the second rate of change is less than or equal to a third threshold;
the third rate of change is greater than or equal to a fourth threshold.
5. The test method according to claim 3 or 4, wherein the degree of deformation of the middle winding and the inner winding comprises the presence of visible deformation, significant deformation and severe deformation.
6. A transformer winding deformation testing device is characterized by comprising:
the capacitance testing module is configured to determine the capacitance of each winding after being grounded relative to the other two windings; wherein the capacitance includes:
first current of external winding relative to middle winding, internal winding and groundCapacity Cw1；
Second capacitance C of the middle winding relative to the outer winding, the inner winding and the groundw2；
Third capacitance C of the inner winding relative to the middle winding, the outer winding and the groundw3；
A capacitance change rate determination module configured to determine a capacitance change rate corresponding to each winding based on the capacitance; wherein the rate of change in capacitance comprises:
first rate of change Δ C for the outer windingw1Wherein, Δ Cw1＝(Cw1-Cw2)/Cw2×100；
Second rate of change Δ C corresponding to the middle windingw2Wherein, Δ Cw2＝(Cw2-Cw1)/Cw1×100；
Third rate of change Δ C for inner windingw3Wherein, Δ Cw3＝(Cw3-Cw2)/Cw2×100；
A deformation evaluation module configured to determine deformation conditions of the middle winding and the inner winding based on the capacitance change rate; determining the deformation degree of the middle winding based on the preset threshold range of the second change rate; and determining the deformation degree of the middle winding based on the preset threshold range of the third change rate.
7. A non-transitory computer-readable storage medium storing computer instructions for causing a computer to perform the method of any one of claims 1 to 5.
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| US8278939B2 (en) * | 2007-09-27 | 2012-10-02 | Indian Institute Of Technology, Bombay | Diagnostic method for determining deformations in a transformer winding |
| CN101776435A (en) * | 2010-01-07 | 2010-07-14 | 河北省电力研究院 | Dielectric-capacitance testing method of deformation degree of transformer winding |
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| CN107478949A (en) * | 2017-08-07 | 2017-12-15 | 中国电力科学研究院 | A kind of deformation of transformer winding inline diagnosis method and system |
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