CN107179469A - Deformation of transformer winding and short-circuit impedance variation relation analysis method - Google Patents
Deformation of transformer winding and short-circuit impedance variation relation analysis method Download PDFInfo
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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
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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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Abstract
The invention provides a kind of deformation of transformer winding and short-circuit impedance variation relation analysis method, including：Each pillar in the limit element artificial module of Transformer Winding displacement, the limit element artificial module is set up using FInite Element and includes high, medium and low three Transformer Windings respectively, Transformer Winding uses line cake module；Using mesolow winding method of operation end road coupling model, handled the winding in finite element region as the inductance in circuit, end road coupling model is coupled as both circuits that electromagnetic field and Transformer electromagnetic field are produced and obtained；The variation tendency of Transformer Short Circuit Impedance during based on field circuit method model emulation Transformer Winding generation radial and axial displacement.Using the present invention, deformation of transformer winding and short-circuit impedance variation relation can be accurately analyzed, winding deformation potential safety hazard is found in time, is easy to eliminating transformer to be possible between the time between overhauls(TBO) catastrophic failure occur, prevents from causing the accident.
Description
Technical field
The present invention is on transformer technology, especially with regard to a kind of deformation of transformer winding and short-circuit impedance variation relation
Analysis method.
Background technology
The safety and stability economical operation of power transformer is extremely great to the meaning of whole power network, and it is pole in power system
One of its important, expensive equipment.Transformer is when by short-circuit impact, the change such as winding may be distorted, misplace, bulge
Shape.Winding deformation not necessarily triggers accident at once, but in Transformer, because the vibration that electromagnetic force is produced can make winding exhausted
Edge is further damaged, if the maximum relative deformation of winding is more than 1.5%, rupturing and causing easily occur in turn-to-turn insulation
Turn-to-turn short circuit, and transformer can still be run, but trouble point is not excluded for, and slight turn-to-turn discharges sustainable development, even results in prominent
Hair property insulation fault and insulation breakdown, this is a kind of normal method of Accident of Transformer caused by winding deformation；In addition, winding becomes
Shape can also cause winding mechanical strength decline, when again by short-circuit impact, will bear incessantly it is electrodynamic impact and it is direct
Generation accident.And the detection method of deformation of transformer winding is mainly Low Voltage Impulse Method, frequency response method and short-circuit impedance at present
Method.Low Voltage Impulse Method has not been used substantially due to easily being disturbed by live electromagnetic environment；Frequency response method is sensitive
Degree is higher, but can not apply in on-line monitoring project, therefore does not possess real-time, it is difficult to find winding deformation safety in time
Hidden danger, transformer is possible between the time between overhauls(TBO) catastrophic failure occur, causes the accident.
The content of the invention
The embodiments of the invention provide a kind of deformation of transformer winding and short-circuit impedance variation relation analysis method, with accurate
Deformation of transformer winding and short-circuit impedance variation relation are analyzed, winding deformation potential safety hazard is found in time, is easy to eliminating transformer
It is possible between the time between overhauls(TBO) catastrophic failure occur.
To achieve these goals, change the embodiments of the invention provide a kind of deformation of transformer winding and short-circuit impedance and close
It is analysis method, including：
Set up every in the limit element artificial module of Transformer Winding displacement, the limit element artificial module using FInite Element
Individual pillar includes high, medium and low three Transformer Windings respectively, and Transformer Winding uses line cake module；
Using medium-low pressure winding method of operation end road coupling model, using the winding in finite element region as in circuit
Inductance processing, end road coupling model couples as both circuits that electromagnetic field and Transformer electromagnetic field are produced
Arrive；
Transformer Short Circuit Impedance during based on field circuit method model emulation Transformer Winding generation radial and axial displacement
Variation tendency.
In one embodiment, the limit element artificial module includes：Two dimensional finite element simulation model and threedimensional FEM
Model.
In one embodiment, the change of Transformer Short Circuit Impedance becomes when radial and axial displacement occurs for emulation Transformer Winding
Gesture, including：Gradually change the radius of winding, obtain the radial deformation of winding under a variety of radiuses and the relation of short-circuit impedance, it is described
Winding includes low pressure winding, middle pressure winding and high pressure winding.
In one embodiment, gradually change the radius of winding, obtain the radial deformation of winding and short-circuit impedance under a variety of radiuses
Relation, including：
Gradually change the radius of winding, obtain the short circuit current flow of winding under a variety of radiuses；
According to the relation applied to the voltage on winding and the short circuit current flow, calculating obtains the radial deformation of winding and short circuit
The relation of impedance.
In one embodiment, gradually change the radius of winding, obtain the short circuit current flow of winding under a variety of radiuses, including：
The radius of winding is reduced 2%, 4%, 6%, 8%, 10% successively, the short circuit electricity of winding under a variety of radiuses is obtained
Stream.
In one embodiment, the change of Transformer Short Circuit Impedance becomes when radial and axial displacement occurs for emulation Transformer Winding
Gesture, including：Gradually change the axial location of winding wire cake, obtain axis of winding deformation and short-circuit impedance under a variety of line cake gaps
Relation, the winding include low pressure winding, middle pressure winding and high pressure winding.
In one embodiment, gradually change the axial location of winding wire cake, obtain axis of winding under a variety of line cake gaps and become
The relation of shape and short-circuit impedance, including：
Gradually change the axial location of winding wire cake, obtain the short circuit current flow of winding under a variety of line cake gaps；
According to the relation applied to the voltage on winding and the short circuit current flow, calculating obtains axis of winding deformation and short circuit
The relation of impedance.
In one embodiment, gradually change the radius of winding, obtain the short circuit current flow of winding under a variety of radiuses, including：
By 2%, 4%, 6%, 8%, the 10% of the deformation gap axially upwards of the line cake of winding, winding under gap is obtained
Short circuit current flow.
In one embodiment, the corresponding D.C. resistance of Transformer Winding is added in the circuit, medium voltage side winding resistance is set
For 0.2 Ω, low-pressure side winding resistance is set to 0.2 Ω, in, 8 line cakes of low pressure winding and winding FEM model be coupled, and
Series connection is realized on the circuit.
Using the present invention, deformation of transformer winding and short-circuit impedance variation relation can be accurately analyzed, winding is found in time
Transformation safe hidden danger, is easy to eliminating transformer to be possible between the time between overhauls(TBO) catastrophic failure occur, prevents from causing the accident.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the deformation of transformer winding and short-circuit impedance variation relation analysis method flow chart of the embodiment of the present invention；
Fig. 2 is the transformer three-dimensional finite element simulation model schematic diagram of the embodiment of the present invention；
Fig. 3 is the transformer three-dimensional finite element simulation model senior middle school low pressure winding top view of the embodiment of the present invention；
Fig. 4 is the structural representation of one embodiment of the invention field circuit method circuit；
Fig. 5 is the radial deformation of the embodiment of the present invention and the relation schematic diagram of short-circuit impedance；
Fig. 6 is the relation schematic diagram of axial deformation of the embodiment of the present invention and short-circuit impedance；
Fig. 7 is the transformer two dimensional finite element simulation model schematic diagram of the embodiment of the present invention；
Fig. 8 is the structural representation of one embodiment of the invention field circuit method circuit.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
Fig. 1 is the deformation of transformer winding and short-circuit impedance variation relation analysis method flow chart of the embodiment of the present invention, such as
Shown in Fig. 1, the deformation of transformer winding includes with short-circuit impedance variation relation analysis method：
S101：The limit element artificial module of Transformer Winding displacement, the finite element simulation mould are set up using FInite Element
Each pillar includes high, medium and low three Transformer Windings respectively in type, and Transformer Winding uses line cake module；
S102：Using medium-low pressure winding method of operation end road coupling model, the winding in finite element region is regard as electricity
Inductance processing in road, end road coupling model is as both electromagnetic field and the circuit of Transformer electromagnetic field generation coupling
Conjunction is obtained；
S103：Transformer short-circuit during based on field circuit method model emulation Transformer Winding generation radial and axial displacement
The variation tendency of impedance.
When Transformer Winding is by short-circuit impact, the short-circuit electromotive force produced in short circuit current flow and leakage field field interactions
It can cause winding deformation under effect.When occurring puncturing between line cake, when turn-to-turn short circuit or disconnected circle, the electricity in equivalent circuit
Obvious change can just occur for sense parameter.What winding deformation was directly resulted in is the change of each conductor position, can cause each distribution electricity
The electrode relative position of appearance changes, and the influence to winding circuit characteristic is the most notable.
The more aobvious protrusion of transformer device structure failure caused by transport and short circuit, wherein, axial displacement failure, which turns into, to be become
One of major reason of depressor damage accident.Theory shows that, for large-scale power transformer, general shape changes with experiment experience
The influence become to leakage magnetic flux and electric capacity is very small.So the winding wire cake that essentially consists in of winding deformation simulation occurs the present invention
The Changeement of short-circuit impedance under misalignment.
Because large-scale power transformer is very expensive, while without load and the power supply that it normally runs is adapted to, it is first based on this
First it is simulated using the means of emulation.The present invention uses FInite Element, simulates Transformer Winding and occurs radial, axial direction
The variation tendency of Transformer Short Circuit Impedance during displacement.The present invention is illustrated with transformer model SFSZ11-180000/220,
It is not intended to limit.
Limit element artificial module includes in S101：Two dimensional finite element simulation model and three-dimensional finite element simulation model.
Transformer three-dimensional finite element simulation model is illustrated first, Fig. 2 is three-dimensional for the transformer of the embodiment of the present invention
Limit element artificial module schematic diagram, Fig. 3 is the transformer three-dimensional finite element simulation model senior middle school low pressure winding of the embodiment of the present invention
Top view.As shown in Figures 2 and 3, each pillar 201 includes high, medium and low three transformations respectively in three-dimensional finite element simulation model
Device winding, is basic, normal, high line ball circle respectively from inside to outside, and Transformer Winding uses line cake module, by high, medium and low three winding point
For 8 line cakes 202.
In one embodiment, in single line cake, the basic, normal, high number of turn is respectively 22,40,77, and the width of line cake is respectively
43.5mm, 88mm, 105mm, every line cake are surrounded using insulating paper thick 1.5mm.
In S102, field circuit method model (can be also known as field circuit method for the equivalent circuit of Transformer electromagnetic field
Circuit), handle, can be acted on the winding in finite element region as the inductance in circuit with the effect of equivalent excitation and leakage field.For
The heating functioin of simulation winding, can add the corresponding D.C. resistance of Transformer Winding in foregoing circuit.In one embodiment,
Medium voltage side winding resistance is set to 0.2 Ω, and low-pressure side winding resistance is set to 0.2 Ω, in, the 8 line cakes 401 and winding of low pressure winding
FEM model is coupled, and series connection is realized in road termination power on the scene, as shown in Figure 4.
Short-circuit impedance for calculating transformer is, it is necessary to when load-side is short-circuit and flows through rated current, measure primary side voltage
With the mould of the ratio of primary side current, namely short-circuit impedance, transformer medium voltage side rated current is 858.9A, the specified electricity of low-pressure side
Flow for 899.8A, low-pressure side rated voltage is 38.5kV, medium voltage side rated voltage is 121kV.
The present invention can emulate the variation tendency that Transformer Short Circuit Impedance during radial and axial displacement occurs for Transformer Winding,
Radial displacement (deformation) and axial displacement are illustrated respectively below.
(1) radial displacement
For three-phase three-winding transformer, due in, the sense of current of low pressure winding is on the contrary, so as to which radial electric power is pair
The outer expansionary force that outer winding is produced, and internally winding is inward force.Under normal circumstances, Transformer Winding is fixed on insulation barrel mast
On, diametral force can produce bending stress when acting on, so as to influence coil to cause deformation.The specific deformed condition of winding and uniform force
Degree is relevant, if winding uniform force, deforms more symmetrical, and winding is concavo-convex into blossom type, when winding discontinuity, easily
Form local prominent so as to cause winding bulge.
The radial deformation of winding and the relation of short-circuit impedance are studied to be more directly perceived, when it is implemented, can gradually change winding
Radius, obtain the radial deformation of winding under a variety of radiuses and the relation of short-circuit impedance, the winding includes low pressure winding, middle pressure
Winding and high pressure winding, the present embodiment are only illustrated with low pressure winding.For low pressure winding, the present embodiment sets low pressure winding
Be 50mm with the gap of iron core, can control low pressure winding it is radial be deformed inward radius reduce successively gap 2%, 4%, 6%,
8%th, in the case of 10% short-circuit impedance change, obtain the radial deformation of winding under a variety of radiuses and the relation of short-circuit impedance.
When it is implemented, when gradually changing the radius of winding, the short circuit current flow of winding under a variety of radiuses can be obtained；According to application extremely
Voltage and the relation of the short circuit current flow on winding, can calculate and obtain the radial deformation of winding and the relation of short-circuit impedance, table 1
For the current peak of low-pressure side under radial displacement failure, Fig. 5 is that the radial deformation of the embodiment of the present invention and the relation of short-circuit impedance are shown
It is intended to.
Table 1
Relation (simulation result) as shown in Figure 5 can be seen that short-circuit impedance has larger association with the radial deformation of winding, when
When transformer is normally run, its short-circuit impedance is 7.846%, when the radial radius of transformer low voltage winding reduces by 10%, i.e. 5mm
When, its short-circuit impedance is 8.136%, and short-circuit impedance with radial degree of displacement increase and close to linearly increasing, it is radial to deform 2%
Short-circuit impedance is about caused to increase by 0.06%.
(2) axial displacement
In transformer, the radial component of electric current and stray field interacts so that winding is by axially electronic masterpiece
With when axial electric power exceedes certain value, winding is excessive so as to cause permanent deformation due to bending moment, a large amount of to run report
Show, this is deformed into circumferentially symmetrical.On the other hand, axial electric power can make line cake axial displacement, so as to change transformer leakage
The short-circuit impedance change that magnetic is caused.
For observation axis of winding deformation more directly perceived and the relation of short-circuit impedance, it can gradually change the axial position of winding wire cake
Put, obtain axis of winding deformation and the relation of short-circuit impedance under a variety of line cake gaps, the winding includes low pressure winding, middle pressure
Winding and high pressure winding, the present embodiment are only illustrated with low pressure winding.For low pressure winding, the present embodiment sets low pressure winding
Line cake spacing be 110mm, can control first line cake of low pressure winding axially upwards deformation gap 2%, 4%, 6%, 8%,
The change of short-circuit impedance in the case of 10%.When it is implemented, when gradually changing the axial location of winding wire cake, can obtain a variety of
Line cake gap under winding short circuit current flow；According to the relation applied to the voltage on winding and the short circuit current flow, calculate
The relation with short-circuit impedance is deformed to axis of winding, Fig. 6 is axial deformation of the embodiment of the present invention and the relation signal of short-circuit impedance
Figure.
Then transformer two dimensional finite element simulation model is illustrated, by setting up two dimensional finite element simulation model to change
Deformation of transformer winding is similar with above-mentioned two dimensional finite element simulation model with the principle that short-circuit impedance variation relation is analyzed, and repeats
Part is repeated no more.By the foundation of above-mentioned three-dimensional finite element simulation model, winding deformation and short-circuit impedance have substantially been understood
Changing rule, but because three-dimensional finite element simulation model is computationally intensive, calculating once needs the long period, therefore can only be by line cake
Number is divided into 8 equal portions, in order to study the situation more close with actual conditions, using two dimensional finite element numerical analysis software Ansoft
To in the SFSZ11-180000/220 three-winding transformers of actual motion, low pressure winding carry out calculation of short-circuit current and leakage field
Logical emulation, transformer parameter is as shown in table 2.
Table 3-2 transformer major parameters
Due to the symmetry of transformer device structure and magnetic circuit, the magnetic flux interaction of each phase winding can be ignored, therefore take list
Phase winding can also simulate actual electromagnetic environment as finite element field analysis.In order that Leakage flux distribution more meets actual conditions, transformation
Device winding uses line cake module, while considering oil duct size, the line cake number of turn and dutycycle between cake.Consider winding in, low pressure around
Group, in being set according to actual conditions, low three winding line cake be 112：179, the total turn ratio of correspondence is 336：179.The width of line cake
Degree is respectively 43.5mm, 88mm, and height is respectively 12mm, 8mm.Build up model as shown in Figure 7.
Set up external circuit excitation model (road coupling model on the spot), by above-mentioned two-dimensional finite element model, low pressure winding coupling
It is bonded in external circuit, such as shown in Fig. 8 (illustrate only low pressure winding).Excitation is supplied by medium voltage side AC power, and virtual value is
110kV, frequency is 50Hz.Medium voltage side winding resistance is set to 0.2 Ω, and low-pressure side winding resistance is set to 0.2 Ω.
For analysis Transformer Winding stressing conditions, simulation study is carried out with winding Leakage flux distribution to the close distribution of winding electricity, by
Single coil configuration is used in low-pressure end, and middle pressure uses inner screen continuous structure, the degree of saturation of line cake is different, so that middle piezoelectricity
Close axially distributed appearance is different.Simulation result：Magnetic flux is larger in the middle of on the inside of line cake, can reach 0.17Weber, two is inclined
Small, about 0.16Weber is basic up and down to keep symmetrical.
In, magnetic field intensity is higher between low pressure winding, can reach 0.11Tesla substantially, and in the magnetic flux highest at middle part, this with
The distribution of the magnetic line of force is consistent, according to the Computing Principle of Lorentz force derive the radial electromagnetic force of intermediate region winding wire cake compared with
Greatly, therefore in the middle part of winding easily occur radial deformation, and low pressure winding produces inward pressure, middle pressure winding produces outside expansion
Power, may cause line cake all wires are outwardly in a circumferential direction, cause winding conducting wire to elongate so that radial, and the tool that insulate
There is not plasticity, final insulation is destroyed to cause the radial deformation of winding.Accordingly, research winding in the middle part of deform after Distribution of Magnetic Field with
And short circuit current flow situation is significant.
For this phenomenon, in finite element between the line cake of winding carry out radial deformation simulation, line cake is outside
Radial mobile 10mm, mobile line cake quantity is with corresponding short circuit current flow relation as shown in table 3-3, and wherein portable cord cake quantity is
0 namely simulation normal operation, portable cord cake quantity be 1 represent it is mobile in press first line cake on winding center top,
Portable cord cake quantity 2,4,8 represents to move 1 respectively along Central Symmetry top and the bottom respectively, 2,4 line cakes.
The portable cord cake number of table 3 and short circuit current flow relation
It can be seen from the data in Table 3 that the peak value of the quantity of portion's portable cord cake and low-pressure side short circuit current flow is in the windings
Linear relationship, when winding is normal, peak value of short is 33842A, often moves its peak value of short of line cake reduction about
35A, thus will cause short-circuit impedance to change.
On the other hand, electric current and the radial component of stray field interact in transformer so that winding is by axial direction
Electrodynamic action, when axial electric power exceedes certain value, winding is excessive so as to cause permanent deformation due to bending moment, largely
Operation report shows that this is deformed into circumferentially symmetrical.For this phenomenon, the line cake of top and the bottom winding is entered in finite element
Row axial deformation is emulated, correspondence by upper lines cake upwards and lower line cake moves 4mm axially downwards, mobile line cake quantity with it is right
The short circuit current flow relation answered as shown in table 4, its portable cord cake it is regular identical with above-mentioned part, here is omitted.
Table 4
It can be seen from the data in Table 4 that the peak value of the quantity and low-pressure side short circuit current flow in winding top and the bottom portable cord cake
Linear, when winding is normal, peak value of short is 33842A, often moves line cake its peak value of short reduction
About 25A, thus will cause short-circuit impedance to change.
Transformer possible different times in longtime running are acted on by diametral force, axial force, cause the radial axle of winding
Exist simultaneously to deformation, for this phenomenon, in finite element between the line cake of winding to carry out radial, axial deformation imitative
Very, by the outside radial mobile 10mm of line cake and axial movement 4mm, mobile line cake quantity and corresponding short circuit current flow relation such as table
Shown in 5.
Table 5
It can be seen from the data in Table 5 that the peak value of the quantity of portion's portable cord cake and low-pressure side short circuit current flow is in the windings
Non-linear relation, when winding is normal, peak value of short is 33842A, and with the line cake quantity increase of deformation, low-pressure side is short
The peak value reduction of road electric current is more notable.Starting stage often moves line cake its peak value of short reduction about 46A, then reduces
Amount increase, during to mobile 8 line cakes, equivalent to every one line cake peak value of short increase about 70A of movement, thus will cause short
Road impedance variations are huge.
It can thus be seen that when winding occurs axial, radial while short-circuit impedance changes the most serious when deforming, according to state
Family's standard, more than capacity 100MVA short-circuit of power transformer impedance variation amount should arouse attention more than 1.6%, by calculating
It was found that 4 line cakes, which deform short-circuit impedance change, turns to 1.72% simultaneously, above-mentioned condition is met, should be drawn attention.
It is described to obtaining above-mentioned simulation result by setting up two dimensional finite element simulation model：
When line cake is inwardly subjected to displacement, short-circuit impedance is with deformation extent increase close to linearly increasing.
When line cake is outwards subjected to displacement, short-circuit impedance is with deformation extent increase close to linearly increasing
When axial displacement occurs for middle part line cake, short-circuit impedance is with deformation extent close to linearly increasing.
When axial displacement occurs for the single line cake in outside, short-circuit impedance reduces with deformation extent close to linear.
Such as drawn a conclusion by the above results：
When more obvious deformation occurs for Transformer Winding, short-circuit impedance is implicitly present in obvious change, can by
Line monitors short-circuit impedance intensity of variation to determine winding deformation failure.
The change essence of short-circuit impedance is caused by the change of leakage magnetic flux, can not directly to summarize during deformation of transformer winding
Into simple rule.
It should be understood by those skilled in the art that, embodiments of the invention can be provided as method, system or computer program
Product.Therefore, the present invention can be using the reality in terms of complete hardware embodiment, complete software embodiment or combination software and hardware
Apply the form of example.Moreover, the present invention can be used in one or more computers for wherein including computer usable program code
The computer program production that usable storage medium is implemented on (including but is not limited to magnetic disk storage, CD-ROM, optical memory etc.)
The form of product.
The present invention is the flow with reference to method according to embodiments of the present invention, equipment (system) and computer program product
Figure and/or block diagram are described.It should be understood that can be by every first-class in computer program instructions implementation process figure and/or block diagram
Journey and/or the flow in square frame and flow chart and/or block diagram and/or the combination of square frame.These computer programs can be provided
The processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce
A raw machine so that produced by the instruction of computer or the computing device of other programmable data processing devices for real
The device for the function of being specified in present one flow of flow chart or one square frame of multiple flows and/or block diagram or multiple square frames.
These computer program instructions, which may be alternatively stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that the instruction being stored in the computer-readable memory, which is produced, to be included referring to
Make the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one square frame of block diagram or
The function of being specified in multiple square frames.
These computer program instructions can be also loaded into computer or other programmable data processing devices so that in meter
Series of operation steps is performed on calculation machine or other programmable devices to produce computer implemented processing, thus in computer or
The instruction performed on other programmable devices is provided for realizing in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in individual square frame or multiple square frames.
Apply specific embodiment in the present invention to be set forth the principle and embodiment of the present invention, above example
Explanation be only intended to help to understand the method and its core concept of the present invention；Simultaneously for those of ordinary skill in the art,
According to the thought of the present invention, it will change in specific embodiments and applications, in summary, in this specification
Appearance should not be construed as limiting the invention.
Claims (9)
1. a kind of deformation of transformer winding and short-circuit impedance variation relation analysis method, it is characterised in that including：
Set up in the limit element artificial module of Transformer Winding displacement, the limit element artificial module and each propped up using FInite Element
Post includes high, medium and low three Transformer Windings respectively, and Transformer Winding uses line cake module；
Using medium-low pressure winding method of operation end road coupling model, the winding in finite element region is regard as the electricity in circuit
Sense is handled, and end road coupling model is coupled as both circuits that electromagnetic field and Transformer electromagnetic field are produced and obtained；
The change of Transformer Short Circuit Impedance during based on field circuit method model emulation Transformer Winding generation radial and axial displacement
Change trend.
2. deformation of transformer winding according to claim 1 and short-circuit impedance variation relation analysis method, it is characterised in that
The limit element artificial module includes：Two dimensional finite element simulation model and three-dimensional finite element simulation model.
3. deformation of transformer winding according to claim 2 and short-circuit impedance variation relation analysis method, it is characterised in that
The variation tendency that Transformer Short Circuit Impedance during radial and axial displacement occurs for Transformer Winding is emulated, including：Gradually change winding
Radius, obtain the radial deformation of winding under a variety of radiuses and the relation of short-circuit impedance, the winding includes low pressure winding, middle pressure
Winding and high pressure winding.
4. deformation of transformer winding according to claim 3 and short-circuit impedance variation relation analysis method, it is characterised in that
Gradually change the radius of winding, obtain the radial deformation of winding under a variety of radiuses and the relation of short-circuit impedance, including：
Gradually change the radius of winding, obtain the short circuit current flow of winding under a variety of radiuses；
According to the relation applied to the voltage on winding and the short circuit current flow, calculating obtains the radial deformation of winding and short-circuit impedance
Relation.
5. deformation of transformer winding according to claim 4 and short-circuit impedance variation relation analysis method, it is characterised in that
Gradually change the radius of winding, obtain the short circuit current flow of winding under a variety of radiuses, including：
The radius of winding is reduced 2%, 4%, 6%, 8%, 10% successively, the short circuit current flow of winding under a variety of radiuses is obtained.
6. deformation of transformer winding according to claim 2 and short-circuit impedance variation relation analysis method, it is characterised in that
The variation tendency that Transformer Short Circuit Impedance during radial and axial displacement occurs for Transformer Winding is emulated, including：Gradually change winding
The axial location of line cake, obtains axis of winding deformation and the relation of short-circuit impedance under a variety of line cake gaps, and the winding includes
Low pressure winding, middle pressure winding and high pressure winding.
7. deformation of transformer winding according to claim 6 and short-circuit impedance variation relation analysis method, it is characterised in that
Gradually change the axial location of winding wire cake, obtain axis of winding deformation and the relation of short-circuit impedance under a variety of line cake gaps,
Including：
Gradually change the axial location of winding wire cake, obtain the short circuit current flow of winding under a variety of line cake gaps；
According to the relation applied to the voltage on winding and the short circuit current flow, calculating obtains axis of winding deformation and short-circuit impedance
Relation.
8. deformation of transformer winding according to claim 7 and short-circuit impedance variation relation analysis method, it is characterised in that
Gradually change the radius of winding, obtain the short circuit current flow of winding under a variety of radiuses, including：
By 2%, 4%, 6%, 8%, the 10% of the deformation gap axially upwards of the line cake of winding, the short circuit of winding under gap is obtained
Electric current.
9. deformation of transformer winding according to claim 1 and short-circuit impedance variation relation analysis method, it is characterised in that
The corresponding D.C. resistance of Transformer Winding is added in the circuit, medium voltage side winding resistance is set to 0.2 Ω, low-pressure side winding electricity
Resistance is set to 0.2 Ω, in, 8 line cakes of low pressure winding and winding FEM model be coupled, and realize and go here and there on the circuit
Connection.
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| CN108387769A (en) * | 2018-02-26 | 2018-08-10 | 河海大学 | A kind of computational methods of reactor interturn short circuit electric current |
| CN108872764A (en) * | 2018-05-23 | 2018-11-23 | 安徽省神虹变压器股份有限公司 | A kind of frequency sweep impedance method of transformer cartridge type winding failure positioning |
| CN109460609A (en) * | 2018-11-10 | 2019-03-12 | 东北电力大学 | A kind of transformer winding turn-to-turn short circuit reverse circulating calculation method |
| CN109470132A (en) * | 2018-10-31 | 2019-03-15 | 广州供电局有限公司 | Deformation of transformer winding detection method, device and equipment |
| CN111007320A (en) * | 2019-12-27 | 2020-04-14 | 广东电网有限责任公司电力科学研究院 | Transformer winding deformation fault positioning detection method |
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| CN112305466A (en) * | 2020-10-13 | 2021-02-02 | 上海电力大学 | Transformer winding deformation detection method based on optical fiber magnetic field sensor and leakage inductance |
| CN113253070A (en) * | 2021-05-19 | 2021-08-13 | 云南电网有限责任公司电力科学研究院 | Method and device for evaluating short-circuit resistance of in-service transformer |
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| CN108387769A (en) * | 2018-02-26 | 2018-08-10 | 河海大学 | A kind of computational methods of reactor interturn short circuit electric current |
| CN108872764A (en) * | 2018-05-23 | 2018-11-23 | 安徽省神虹变压器股份有限公司 | A kind of frequency sweep impedance method of transformer cartridge type winding failure positioning |
| CN109470132A (en) * | 2018-10-31 | 2019-03-15 | 广州供电局有限公司 | Deformation of transformer winding detection method, device and equipment |
| CN109460609A (en) * | 2018-11-10 | 2019-03-12 | 东北电力大学 | A kind of transformer winding turn-to-turn short circuit reverse circulating calculation method |
| CN109460609B (en) * | 2018-11-10 | 2023-04-25 | 东北电力大学 | Method for calculating turn-to-turn short circuit reverse circulation of transformer winding |
| CN111007320B (en) * | 2019-12-27 | 2021-11-02 | 广东电网有限责任公司电力科学研究院 | Transformer winding deformation fault positioning detection method |
| CN111007320A (en) * | 2019-12-27 | 2020-04-14 | 广东电网有限责任公司电力科学研究院 | Transformer winding deformation fault positioning detection method |
| CN111666703A (en) * | 2020-06-09 | 2020-09-15 | 云南电网有限责任公司电力科学研究院 | Method and device for calculating impedance variation of dry-type air-core reactor |
| CN111666703B (en) * | 2020-06-09 | 2023-09-22 | 云南电网有限责任公司电力科学研究院 | Method and device for calculating impedance variation of dry type air reactor |
| CN111722152A (en) * | 2020-06-29 | 2020-09-29 | 龚小娟 | Transformer winding deformation monitoring method and monitoring system |
| CN111722152B (en) * | 2020-06-29 | 2023-04-28 | 成都工百利自动化设备有限公司 | Transformer winding deformation monitoring method and monitoring system |
| CN112305466A (en) * | 2020-10-13 | 2021-02-02 | 上海电力大学 | Transformer winding deformation detection method based on optical fiber magnetic field sensor and leakage inductance |
| CN112305466B (en) * | 2020-10-13 | 2023-02-07 | 上海电力大学 | Transformer winding deformation detection method based on optical fiber magnetic field sensor and leakage inductance |
| CN113253070A (en) * | 2021-05-19 | 2021-08-13 | 云南电网有限责任公司电力科学研究院 | Method and device for evaluating short-circuit resistance of in-service transformer |
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