CN110030920A - A kind of test method of deformation of transformer winding, device and storage medium - Google Patents
A kind of test method of deformation of transformer winding, device and storage medium Download PDFInfo
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- CN110030920A CN110030920A CN201910413637.6A CN201910413637A CN110030920A CN 110030920 A CN110030920 A CN 110030920A CN 201910413637 A CN201910413637 A CN 201910413637A CN 110030920 A CN110030920 A CN 110030920A
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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
- G01B7/22—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge using change in capacitance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2605—Measuring capacitance
Abstract
The invention relates to a kind of test method of deformation of transformer winding, device and storage mediums, and to realize more convenient and accurately determine whether deformation of transformer winding deforms, and there are deformation extents when winding deformation for determining transformer.The test method comprises determining that each winding with respect to the capacitance after other two winding earths；Based on the capacitance, the corresponding rate of change of capacitance of each winding is determined；Based on the rate of change of capacitance, the deformation of middle part winding and internal winding is determined.
Description
Technical field
The invention relates to electric power project engineering fields, and in particular to a kind of test side of deformation of transformer winding
Method, device and storage medium.
Background technique
When power transformer is by short-circuit impact, width is less than axial leakage field to leakage field, and width is occupied an leading position to electric power, this
When high-low pressure winding transient current it is contrary, by tension, inside winding is always attempted to make between winding outside winding by repulsion
Main leakage airway area increases.But low pressure winding electric current is usually the several times of high-voltage winding, the electromagnetic force that low pressure winding is born
Be high-voltage winding decades of times to hundreds times, due to high-low pressure winding Proof strength of non-proportional (Rp0.2) difference generally not
Greater than 100%, therefore low pressure winding width is the Main Patterns of winding deformation of power transformer to deformation.
In the prior art, judge that Winding in Power Transformer width usually has winding frequency response analysis, low tension to deformation
Short circuit impedance method and capacitance method etc..Wherein, winding frequency response analysis has corresponding point with low-voltage short circuit impedance method
The professional standard of analysis and judgement, respectively DL/T 911 " frequency response analysis of winding deformation of power transformer " and DL/
T1093 " the reactance method detection of winding deformation of power transformer judges directive/guide ".
Frequency response analysis refers to that under the voltage effect of upper frequency, each winding of power transformer can be considered
One passive linear two-port network being made of linear resistance, inductance (mutual inductance) and capacitor equal distribution parameter, bulk properties can
It is described by transfer function H (j ω).If winding deforms, the parameters such as distributed inductance, capacitor inside winding necessarily change,
The zero point and pole for leading to its equivalent network transfer function H (j ω) change, and become the frequency response characteristic of network
Change.Frequency range involved in frequency response analysis is defined as 1kHz~1000kHz in China rower DL/T911.Frequency is rung
It answers analytic approach to generally use longitudinal comparison mode and lateral comparison mode, the sensitivity with higher of longitudinal comparison mode, but needs
The original amplitude-frequency response characteristic of transformer is obtained ahead of time, and shadow caused by changing because of testing conditions and detection mode need to be excluded
It rings, field application is difficult.Lateral comparison mode compares the three-phase windings amplitude-frequency response characteristic of the same voltage class of transformer
Compared with field application is more convenient, but the deformation or normal transformation of similarity degree occur for the three-phase windings that need to exclude power transformer
A possibility that amplitude-frequency response characteristic of device three-phase windings itself has differences, scene judgement are easy to appear erroneous judgement.
Low tension short circuit impedance method field conduct is convenient, but sensitivity is lower, can not accurately judge which winding
It deforms.
And capacitance method in the prior art is the capacitor quantitative change of the winding itself about winding deformation of power transformer
The analysis of change, and quantitative analysis is not carried out to winding deformation situation.
It needs one kind that can easily implement at the scene in factors above, and can accurately determine power transformer around
Whether group deforms and the method for deformation extent.
Summary of the invention
Of the existing technology in order to solve the problems, such as, at least one embodiment of the application provides a kind of transformer winding
Test method, device and the storage medium of deformation, to realize more convenient and accurately whether determine winding deformation of power transformer
It deforms and there are deformation extents when winding deformation.
In a first aspect, the application provides a kind of test method of deformation of transformer winding, the transformer include it is external around
Group, middle part winding and internal winding, method include:
Determine each winding with respect to the capacitance after other two winding earths；
Based on the capacitance, the corresponding rate of change of capacitance of each winding is determined；
Based on the rate of change of capacitance, the deformation of middle part winding and internal winding is determined.
Second aspect, the application implement people's example and provide a kind of test device of deformation of transformer winding, comprising:
Capacitance test module is configured to determine each winding with respect to the capacitance after other two winding earths；
Rate of change of capacitance determining module is configured to the capacitance, determines the corresponding electric capacitance change of each winding
Rate；
Deformation values module is configured to the rate of change of capacitance, determines the deformation of middle part winding and internal winding
Situation.
The third aspect, the embodiment of the present application provide a kind of non-transient computer readable storage medium, the non-transient calculating
Machine readable storage medium storing program for executing stores computer instruction, and the computer instruction makes computer execute method as described above.
In the embodiment of the present application, by the variation of the capacitance between adjacent winding, transformer winding (especially middle part is determined
Winding and internal winding) whether deform and deformation extent, convenient for field conduct and accuracy it is high.
Detailed description of the invention
Technical solution in ord to more clearly illustrate embodiments of the present application, below will be in embodiment or description of the prior art
Required attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description is only some realities of the application
Example is applied, it for those of ordinary skill in the art, without any creative labor, can also be attached according to these
Figure obtains other attached drawings.
Fig. 1 is transformer longitudinal cut section schematic diagram provided by the embodiments of the present application；
Fig. 2 is a kind of flow chart of the test method of deformation of transformer winding provided by the embodiments of the present application；
The schematic diagram of changing rule of the Fig. 3 between electric capacitance change provided by the embodiments of the present application and winding deformation amount；
Fig. 4 is a kind of schematic diagram of the test device of deformation of transformer winding provided by the embodiments of the present application.
Specific embodiment
To keep the purposes, technical schemes and advantages of the embodiment of the present application clearer, below in conjunction with the embodiment of the present application
In attached drawing, the technical scheme in the embodiment of the application is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the application, instead of all the embodiments.Based on the embodiment in the application, ordinary skill people
Member's every other embodiment obtained without making creative work, shall fall in the protection scope of this application.
It should be noted that, in this document, the relational terms of such as " first " and " second " or the like are used merely to one
A entity or operation with another entity or operate distinguish, without necessarily requiring or implying these entities or operation it
Between there are any actual relationship or orders.
Transformer involved in the application may include outside winding, middle part winding, internal winding and iron core, longitudinal sectional to cut open
Face schematic diagram is as shown in Figure 1, capacitance profile between each winding C1, C2 and C3 as illustrated in the drawing.Wherein, the internal diameter of each winding and
Outer diameter R as illustrated in the drawingW3Outside, RW2Interior, RW2Outer and RW1It is interior.For three-winding transformer, winding deformation may have following feelings
Condition: a kind of situation is that middle part winding is the winding for being easiest to deform, if middle part group deforms, internal winding can
It can can also be deformed due to the extruding of middle part winding, when especially significant deformation occurs for middle part winding；Another situation is that
Middle part winding does not deform, and only internal winding deforms.The test method of deformation of transformer winding provided by the present application, can
To be suitable for two kinds of above-mentioned situations.
In a first aspect, the application provides a kind of test method of deformation of transformer winding, transformer include outside winding, in
Portion's winding and internal winding, the test method are as shown in Figure 2, comprising:
201, determine each winding with respect to the capacitance after other two winding earths.
202, it is based on capacitance, determines the corresponding rate of change of capacitance of each winding.
203, it is based on rate of change of capacitance, determines the deformation of middle part winding and internal winding.
In a possible embodiment, capacitance includes:
First capacitor amount of the outside winding with respect to middle part winding, internal winding and ground；
Second capacitance of middle part winding opposite outer winding, internal winding and ground；
Third capacitance of the internal winding with respect to middle part winding, outside winding and ground.
In the embodiment of the present application, first capacitor amount is with Cw1It indicates, the second capacitance is with Cw2It indicates, third capacitance is with Cw3
It indicates.
In a possible embodiment, for step 201, following specific mode can implements, comprising:
Outside winding head and the tail are shorted, winding head and the tail in middle part are shorted and are grounded, internal winding head and the tail are shorted and are grounded, transformation
The iron core grounding of device determines first capacitor amount C by reverse wiring modew1；
Winding head and the tail in middle part are shorted, outside winding head and the tail are shorted and are grounded, internal winding head and the tail are shorted and are grounded, transformation
The iron core grounding of device determines the second capacitance C by reverse wiring modew2；
Internal winding head and the tail are shorted, outside winding head and the tail are shorted and are grounded, winding head and the tail in middle part are shorted and are grounded, transformation
The iron core grounding of device determines third capacitance C by reverse wiring modew3。
In the embodiment of the present application, rate of change of capacitance may include the corresponding first change rate Δ C of outside windingw1, middle part
The corresponding second change rate Δ C of windingw2, the corresponding third change rate Δ C of internal windingw3。
It, can be according to first capacitor amount with C in step 202w1, the second capacitance is with Cw2, third capacitance is with Cw3, determine
First change rate Δ Cw1, the second change rate Δ Cw2, third change rate Δ Cw3, it is specific as follows:
First change rate Δ Cw1It is determined by following formula:
ΔCw1=(Cw1-Cw2)/Cw2×100 (1)
Second change rate Δ Cw2It is determined by following formula:
ΔCw2=(Cw2-Cw1)/Cw1×100 (2)
Third change rate Δ Cw3It is determined by following formula:
ΔCw3=(Cw3-Cw2)/Cw2×100 (3)
In step 203, based on the first determining change rate Δ C of step 202w1, the second change rate Δ Cw2, third change rate
ΔCw3, the deformation of middle part winding and internal winding can be judged, specific:
It determines that middle part winding deforms, meets following condition:
First change rate Δ Cw1Less than or equal to first threshold；
Second change rate Δ Cw2More than or equal to second threshold.
It determines that internal winding deforms, meets following condition:
Second change rate Δ Cw2Less than or equal to third threshold value；
Third change rate Δ Cw3More than or equal to the 4th threshold value.
In the embodiment of the present application, first threshold, second threshold, third threshold value and the 4th threshold value can be according to gross datas
Setting, can also be arranged according to historical data, or be modified according to practical situation, can have general applicability.
Certainly, for some application scenarios with more main required precision, first threshold, the second threshold can be determined using other modes
Value, third threshold value and the 4th threshold value, but the test method that its determination transformer deforms is still in the protection scope of the application
Within.
The embodiment of the present application is also based on second on the basis of winding and internal winding deform in the middle part of determination
Change rate Δ Cw2With third change rate Δ Cw3, the deformation extent of middle part winding and internal winding is determined respectively, which can
To include that there are visible deformations, significant deformation and severely deformed.
In a possible implementation, the second change rate Δ C can be based onw2Locating preset threshold range determines
The deformation extent of middle part winding；And it is based on third change rate Δ Cw3Locating preset threshold range determines the change of middle part winding
Shape degree.It should be noted that preset threshold range can have different ranges according to the difference of winding, it can be according to reason
It is arranged by data, can also be arranged according to historical data, or is modified according to practical situation.
The application is understood in order to clearer, and specific deformation and the determination of deformation extent are illustrated.Assuming that
Test obtains first capacitor amount Cw1, the second capacitance Cw2With third capacitance Cw3；And based on above-mentioned capacitance and formula (1)-
Formula (3) has determined the first change rate Δ Cw1, the second change rate Δ Cw2With third change rate Δ Cw3.And based on reason set theory data
It is -1.5%, second threshold 3%, third threshold value -1.5% and the 4th threshold value 2% provided with first threshold.
When specific determining winding deforms, the condition for judging that middle part winding deforms is as follows:
ΔCw1≤ -1.5%；
ΔCw2>=3%.
ΔCw1≤ -1.5%, Δ Cw2>=3% meets simultaneously, then middle part winding deforms.
The condition for judging that internal winding deforms is as follows:
ΔCw2≤ -1.5%；
ΔCw3>=2%.
ΔCw2≤ -1.5%, Δ Cw3>=2% meets simultaneously, then internal winding deforms.
Assuming that having there is the preset threshold range for determining deformation extent, then when specifically determining winding deformation degree, sentence
Disconnected middle part winding deformation degree is as follows:
3%≤Δ Cw2< 4%, then there are visible deformations for W2 winding；
4%≤Δ Cw2< 6%, then there is significant deformation in W2 winding；
6%≤Δ Cw2, then there are severely deformed for W2 winding.
Judge that internal winding deformation degree is as follows:
2%≤Δ Cw3< 3%, then there are visible deformations for W3 winding；
3%≤Δ Cw3< 5%, then W3 winding significantly deforms；
5%≤Δ Cw3, then W3 winding is severely deformed.
Original radius data and rate of change of capacitance based on transformer, can also determine winding deformation amount, wherein winding
Variation tendency between electric capacitance change and winding deformation amount helically.
As shown in figure 3, middle part winding deforms, capacitor quantitative change by taking a 180000kVA three-winding transformer as an example
Change the changing rule between winding deformation amount, meets " the variation between winding electric capacitance change and winding deformation amount helically
Trend ".It is described as follows: setting R2/R1=K as constant, R2 is winding radius in the middle part of transformer, and R1 is transformer outside winding
Radius, transformer new for one, K be it is fixed, when short-circuit impact occurs for winding, can occur in winding hand width to or it is axial
Deformation, capacitance formula can be such that
CWW=(17.7 π εW H)/Ln(R2/R1)÷1000 (4)
In actually detected, the case where according to disintegrating to transformer, most of transformers are width to deformation, therefore,
It can be assumed H, εWIt remains unchanged.Then rate of change of capacitance:
△ C=(C2-C1)/C1 (5)
It is assumed that R1 is indeformable, X is the deflection of winding radius R2 in the middle part of transformer, and X=(R2'-R2)/R2, R2' are middle part
Radius after winding deformation can then derive following formula:
R2'=(X+1) R2 (6)
C2=(17.7 π εW H)/Ln(R2'/R1)÷1000 (7)
C1=(17.7 π εW 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)
By above-mentioned formula, it is known that the relationship of winding variable quantity and electric capacitance change amount exponentially function.
According to the three-winding transformer structure: if K=1.333, the curved line relation function or formula: X=1.333(1 /(△C+1)-1)- 1, meet " variation tendency between winding electric capacitance change and winding deformation amount helically ".
It should be noted that in the present embodiment preset threshold range specific value, merely to clearer theory
It is bright, can be according to the difference of transformer, or difference according to demand is configured or adjusts, the application not as
Limit.
In the embodiment of the present application, by the variation of the capacitance between adjacent winding, transformer winding (especially middle part is determined
Winding and internal winding) whether deform and deformation extent, convenient for field conduct and accuracy it is high.
Second aspect, the embodiment of the present application provide a kind of test device of deformation of transformer winding, as Fig. 4 includes:
Capacitance test module 401 is configured to determine each winding with respect to the capacitance after other two winding earths；
Rate of change of capacitance determining module 402, is configured to capacitance, determines the corresponding electric capacitance change of each winding
Rate；
Deformation values module 403 is configured to rate of change of capacitance, determines the deformation feelings of middle part winding and internal winding
Condition.
It is apparent to those skilled in the art that for convenience and simplicity of description, foregoing description device and
The specific work process of module, can refer to corresponding processes in the foregoing method embodiment, and details are not described herein.
The third aspect, the embodiment of the present application provide a kind of non-transient computer readable storage medium, and non-transient computer can
It reads storage medium and stores computer instruction, computer instruction makes computer execute the test method of above-mentioned deformation of transformer winding.
Those of ordinary skill in the art may be aware that mould described in conjunction with the examples disclosed in the embodiments of the present disclosure
Block and algorithm steps can be realized with the combination of electronic hardware or computer software and electronic hardware.These functions are actually
It is implemented in hardware or software, the specific application and design constraint depending on technical solution.Professional technician
Each specific application can be used different methods to achieve the described function, but this realization is it is not considered that exceed
Scope of the present application.
In embodiment provided herein, it should be understood that unless existing clear between the step of embodiment of the method
Sequencing, otherwise execution sequence can arbitrarily adjust.Disclosed device and method, may be implemented in other ways.
For example, the apparatus embodiments described above are merely exemplary, for example, the division of the module, only a kind of logic
Function division, there may be another division manner in actual implementation, such as multiple module or components can combine or can collect
At another system is arrived, or some features can be ignored or not executed.Another point, shown or discussed mutual coupling
It closes or direct-coupling or communication connection can be through some interfaces, the indirect coupling or communication connection of device or module can be with
It is electrically mechanical or other forms.
It, can also be in addition, can integrate in a processing module in each functional module in each embodiment of the application
It is that modules physically exist alone, can also be integrated in two or more modules in a module.
It, can be with if the function is realized and when sold or used as an independent product in the form of software function module
It is stored in a computer readable storage medium.Based on this understanding, the technical solution of the embodiment of the present application is substantially
The part of the part that contributes to existing technology or the technical solution can embody in the form of software products in other words
Come, which is stored in a storage medium, including some instructions are used so that a computer equipment (can
To be personal computer, server or the network equipment etc.) execute each embodiment the method for the application all or part
Step.
It should be noted that, in this document, the terms "include", "comprise" or its any other variant are intended to non-row
His property includes, so that the process, method, article or the device that include a series of elements not only include those elements, and
And further include other elements that are not explicitly listed, or further include for this process, method, article or device institute it is intrinsic
Element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including being somebody's turn to do
There is also other identical elements in the process, method of element, article or device.
It will be appreciated by those of skill in the art that although some embodiments described herein include other embodiments is wrapped
Certain features for including rather than other feature, but the combination of the feature of different embodiments mean in scope of the present application it
It is interior and form different embodiments.
Although being described in conjunction with the accompanying presently filed embodiment, those skilled in the art can not depart from this Shen
Various modifications and variations are made in the case where spirit and scope please, such modifications and variations are each fallen within by appended claims
Within limited range.
Claims (10)
1. a kind of test method of deformation of transformer winding, the transformer includes outside winding, middle part winding and internal winding,
It is characterised by comprising:
Determine each winding with respect to the capacitance after other two winding earths；
Based on the capacitance, the corresponding rate of change of capacitance of each winding is determined；
Based on the rate of change of capacitance, the deformation of middle part winding and internal winding is determined.
2. test method according to claim 1, which is characterized in that the capacitance, comprising:
First capacitor amount of the outside winding with respect to middle part winding, internal winding and ground；
Second capacitance of middle part winding opposite outer winding, internal winding and ground；
Third capacitance of the internal winding with respect to middle part winding, outside winding and ground.
3. test method according to claim 2, which is characterized in that after determining each winding with respect to other two winding earths
Capacitance, comprising:
Outside winding head and the tail are shorted, winding head and the tail in middle part are shorted and are grounded, internal winding head and the tail are shorted and are grounded, transformer
Iron core grounding determines the first capacitor amount by reverse wiring mode；
Winding head and the tail in middle part are shorted, outside winding head and the tail are shorted and are grounded, internal winding head and the tail are shorted and are grounded, transformer
Iron core grounding determines second capacitance by reverse wiring mode；
Internal winding head and the tail are shorted, outside winding head and the tail are shorted and are grounded, winding head and the tail in middle part are shorted and are grounded, transformer
Iron core grounding determines the third capacitance by reverse wiring mode.
4. test method according to claim 2, which is characterized in that the rate of change of capacitance, comprising:
Corresponding first change rate of outside winding, corresponding second change rate of middle part winding, the corresponding third variation of internal winding
Rate.
5. test method according to claim 4, which is characterized in that determine that middle part winding deforms, meet following item
Part:
First change rate is less than or equal to first threshold；
Second change rate is greater than or equal to second threshold.
6. test method according to claim 4, which is characterized in that determine that internal winding deforms, meet following item
Part:
Second change rate is less than or equal to third threshold value；
The third change rate is greater than or equal to the 4th threshold value.
7. test method according to claim 5 or 6, which is characterized in that the deformation extent of middle part winding and internal winding
Including there are visible deformations, significant deformation and severely deformed.
8. test method according to claim 7, which is characterized in that further include based on pre- locating for second change rate
If threshold range, the deformation extent of middle part winding is determined；And based on preset threshold model locating for the third change rate
It encloses, determines the deformation extent of middle part winding.
9. a kind of test device of deformation of transformer winding characterized by comprising
Capacitance test module is configured to determine each winding with respect to the capacitance after other two winding earths；
Rate of change of capacitance determining module is configured to the capacitance, determines the corresponding rate of change of capacitance of each winding；
Deformation values module is configured to the rate of change of capacitance, determines the deformation of middle part winding and internal winding.
10. a kind of non-transient computer readable storage medium, which is characterized in that the non-transient computer readable storage medium is deposited
Computer instruction is stored up, the computer instruction makes computer execute such as claim 1 to 8 the method.
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