CN105224724A - The computing method of the displacement of a kind of Transformer Winding short-circuit impact and vibration acceleration - Google Patents
The computing method of the displacement of a kind of Transformer Winding short-circuit impact and vibration acceleration Download PDFInfo
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Abstract
The computing method of a kind of Transformer Winding short-circuit impact bottom offset and acceleration, comprise following content: according to transformer size at ANSYS? maxwell is utilized in workbench? 2D analysis module sets up 1/2 symmetry model of winding unshakable in one's determination, and solves the electric power on each winding wire cake according to excitation information; At ANSYS? create transient structural analysis module in workbench, set up the three-dimensional model of Transformer Winding, model comprises cushion block and end pressing plate between winding wire cake, cake; According to electric power result of calculation, the stressed of winding wire cake is arranged, and corresponding constraint condition and solving condition are set; Field counter is utilized to obtain the displacement of each line cake in short-circuit impact, the cloud atlas of acceleration.
Description
Technical field
The invention belongs to the technical field of power transformer emulation, relate to the displacement of winding and the computing method of acceleration under a kind of transformer burst external short circuit fault.
Background technology
One of equipment very important and expensive in electric system during power transformer.Its operation conditions not only affects the safety of itself, and affects stability and the reliability of whole Operation of Electric Systems.For a long time, the safety of power transformer, reliability service are subject to the most attention of operation power and administrative authority always, and this is also the important indicator of security of system, stable and economical operation.Along with the fast development of national economy, the demand of people to electricity is increasing, and the effect that power transformer plays also becomes more and more important, and towards electric pressure and the larger future development of capacity.
The winding of transformer will be subject to huge short-circuit force effect when it is short-circuited fault, and winding can be easy to damages such as deforming, collapse under this power effect.Due to the high cost of high-power transformer, therefore the overwhelming majority does not carry out short-circuit test.People's early start research short circuit in winding intensity is considered from static state, the scholar of many countries has made large quantifier elimination to this, wherein Japanese scholars has constructed a kind of new strength theory model, this model take the theory of plasticity as foundation, and on the basis of carrying out test of many times, give the experience factor of formula.The static state research of winding is considered to coil static, overall, can affect the electrodynamic distribution of winding after not considering that winding is stressed and moving.Transformer be short-circuited in actual motion fault time, deformation and displacement will be there is in winding under the effect of short-circuit force, this will change the distribution situation in magnetic field in transformer, and then cause the change of short-circuit electromotive force, therefore only have and short-circuit process is thought of as dynamic process, could match with actual conditions.Therefore, people start the dynamic studies of short circuit to carry out as emphasis.Dynamic problem comprises axial dynamically short-circuit strength problem and width to dynamic short-circuit strength problem, and it is generally acknowledged between them it is separate.When axially dynamically short-circuit strength is analyzed, having distributed mass Dan Praise with one carrys out alternative winding usually, and solves axial electrodynamic action to the result in this model system.When width is analyzed to dynamic short-circuit strength, usually regarded as the beam that two ends support, then its stability is analyzed.Therefore, by the dynamic response of Finite Element Method to winding during transformer burst external fault, as displacement, acceleration are analyzed, and then the short-circuit strength problem of research Transformer Winding is very necessary and significant.
Summary of the invention
Fundamental purpose of the present invention is: for the shortcoming and defect of traditional analytical method for the research of Winding in Power Transformer dynamic stability, test method(s) and two Dimension Numerical solution, adopt three-dimensional finite element analysis technology to calculate more accurately the dynamic displacement of the winding under short-circuit impact electric current and acceleration, reference can be provided for the short circuit dynamic stability Journal of Sex Research of transformer and the research of Short Circuit withstand level.The method mainly comprises the following steps:
1. set up the finite element model only comprising the two dimension of single-phase iron core column and winding and the transformer winding model containing line cake, cushion block, pressing plate according to the physical size of Transformer Winding and iron core;
2. arrange coil section, direction of current and the number of turn, the direction of current of high-low pressure winding is contrary;
3. according to short-circuit current during power transformer short-circuited outside fault or short circuit wave-record chart, the winding arranged is encouraged;
4. the stressed size of winding and distribution when outside sudden short circuit occurs calculating transformer;
5. in ANYSYworkbench, create dynamic structure analysis module (Transientstructure) and three-dimensional winding model is imported in module;
6. according to the material properties of line cake, all parts in model is arranged;
7. dynamic displacement and the acceleration of the winding under pair sudden short circuit fault solve, and export the displacement in each moment and the cloud atlas of acceleration.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, introduce doing the accompanying drawing used required in embodiment or description of the prior art simply below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Accompanying drawing 1 is transformer realistic model cut-open view provided by the invention;
Accompanying drawing 2 is transformer realistic model vertical view provided by the invention;
Accompanying drawing 3 is transformer core magnetization curve figure provided by the invention;
The displacement of winding when accompanying drawing 4 is transformer sudden short circuit provided by the invention impact and the calculation flow chart of acceleration.
Wherein, 1 is transformer high-voltage winding, and 2 is transformer low voltage winding, and 3 is transformer core, 4 is oil tank of transformer, and 5 is high pressure winding list cake winding, and 6 is low pressure winding list cake winding, 7 is transformer oil, and 8 is the single-turn circular coil of low pressure winding, and 9 is the single-turn circular coil of high pressure winding.
Embodiment
In order to make technical matters solved by the invention, technical scheme and beneficial effect clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
With reference to figure 1, Fig. 2 and Fig. 4, the invention provides the computing method of displacement under a kind of Transformer Winding short-circuit impact and acceleration, comprise the following steps:
Maxwell2D analysis module is created in ANSYSWorkbench, adopt two-dimensional magnetic field transient magnetic field analytical technology, the size according to transformer core and winding sets up 1/2 symmetry model, includes the high-pressure side winding 1 that the number of turn is N1, the number of turn is the low-pressure side winding 2 of N2, iron core 3;
Described high-pressure side winding 1 is made up of the cake formula structure 5 of same size, does not have physical contact between each line cake;
Described high-pressure side winding 1 is made up of the cake formula structure 6 of same size, does not have physical contact between each line cake;
The single-turn circular coil 9 arranging 1 of high pressure winding is a coilterminal, and to arrange current direction be clockwise direction;
The single-turn circular coil 8 arranging 2 of low pressure winding is a coilterminal, and arranges current direction for counterclockwise;
Arrange the conductivity of the iron core in finite element model, winding material, magnetic permeability, wherein the BH curve of iron core as shown in Figure 3;
According to fault current information and wave-record chart, each coilterminal to high pressure winding encourages, and encourages each coilterminal in low pressure winding according to the no-load voltage ratio of the high-low pressure winding of transformer;
Utilize the output function in ANSYSMaxwell with 0.5ms for step-length exports the electric power curve suffered by each line cake;
In ANSYSWorkbench, create dynamic structure (Transientstructure) module and with not setting up the model of transformer high-low-voltage winding, the parts comprised in model mainly comprise line cake, cushion block and allow the pressing plate of winding overhang;
In material depot, the material properties according to winding wire cake and cushion block is arranged relevant material, and the attribute of setting mainly comprises density of material, young modulus of material and Poisson ratio;
Electrodynamic result of calculation added on each the layer line cake in winding, the step-length of interpolation needs and electrodynamic result of calculation is consistent, and simultaneously and arrange electrodynamic direction according to symmetry, makes the plane of symmetry of axis of winding electric power sensing winding;
Fixed constraint (fixedsupport) is adopted to the pressing plate of winding overhang, to remaining part all a retaining shaft to degree of freedom;
In analysissetting, basis is step-length with 0.5ms, and is that sub-step progress row solves set of time with 0.25ms;
In ratio of damping (dampingcontrols), arrange ratio of damping is 0.3;
In result of calculation, utilize the field counter of ANSYS software to obtain displacement and the acceleration curve over time of the not collinear cake of each moment winding, realize the assessment to winding dynamic perfromance.
Claims (1)
1. computing method for the displacement of Transformer Winding short-circuit impact and vibration acceleration, is characterized in that comprising the following steps:
1) finite element model only comprising the two dimension of single-phase iron core column and winding and the transformer winding model containing line cake, cushion block, pressing plate is set up according to the physical size of Transformer Winding and iron core;
2) arrange coil section, direction of current and the number of turn, the direction of current of high-low pressure winding is contrary;
3) according to short-circuit current during power transformer short-circuited outside fault or short circuit wave-record chart, the winding arranged is encouraged;
4) the stressed size of winding and distribution when outside sudden short circuit occurs calculating transformer;
5) in ANYSYworkbench, create dynamic structure analysis module Transientstructure and three-dimensional winding model is imported in module;
6) according to the material properties of line cake, all parts in model is arranged;
7) dynamic displacement of the winding under sudden short circuit fault and acceleration are solved, and export the displacement in each moment and the cloud atlas of acceleration.
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| CN201510573625.1A CN105224724A (en) | 2015-09-10 | 2015-09-10 | The computing method of the displacement of a kind of Transformer Winding short-circuit impact and vibration acceleration |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106650007A (en) * | 2016-11-16 | 2017-05-10 | 国家电网公司 | Computing method of leakage magnetic field and winding vibration displacement of transformer in steady state |
| CN106777812A (en) * | 2017-01-17 | 2017-05-31 | 华北电力大学（保定） | A kind of computational methods of Transformer Winding short circuit vibration characteristics |
| CN106768559A (en) * | 2017-01-17 | 2017-05-31 | 华北电力大学（保定） | A kind of dynamic force analysis method of Transformer Winding under short trouble |
| CN106777534A (en) * | 2016-11-25 | 2017-05-31 | 广东电网有限责任公司电力科学研究院 | A kind of transformer winding vibration transmission characteristic monitoring method based on finite element theory |
| CN108920731A (en) * | 2018-03-27 | 2018-11-30 | 东北电力大学 | A kind of calculation method of transformer winding turn-to-turn short circuit vibration acceleration |
| CN110988525A (en) * | 2019-11-19 | 2020-04-10 | 国网河北省电力有限公司电力科学研究院 | Evaluation method for impact of repeated short circuit on power transformer in short time |
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| CN104361173A (en) * | 2014-11-17 | 2015-02-18 | 国家电网公司 | Method and system for acquiring state and leakage reactance parameter relation of transformer winding |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106650007A (en) * | 2016-11-16 | 2017-05-10 | 国家电网公司 | Computing method of leakage magnetic field and winding vibration displacement of transformer in steady state |
| CN106777534A (en) * | 2016-11-25 | 2017-05-31 | 广东电网有限责任公司电力科学研究院 | A kind of transformer winding vibration transmission characteristic monitoring method based on finite element theory |
| CN106777534B (en) * | 2016-11-25 | 2020-05-22 | 广东电网有限责任公司电力科学研究院 | Transformer winding vibration transfer characteristic monitoring method based on finite element theory |
| CN106777812A (en) * | 2017-01-17 | 2017-05-31 | 华北电力大学（保定） | A kind of computational methods of Transformer Winding short circuit vibration characteristics |
| CN106768559A (en) * | 2017-01-17 | 2017-05-31 | 华北电力大学（保定） | A kind of dynamic force analysis method of Transformer Winding under short trouble |
| CN106768559B (en) * | 2017-01-17 | 2019-08-20 | 华北电力大学（保定） | A kind of dynamic force analysis method of transformer winding under short trouble |
| CN106777812B (en) * | 2017-01-17 | 2020-06-09 | 华北电力大学（保定） | Method for calculating short-circuit vibration characteristics of transformer winding |
| CN108920731A (en) * | 2018-03-27 | 2018-11-30 | 东北电力大学 | A kind of calculation method of transformer winding turn-to-turn short circuit vibration acceleration |
| CN108920731B (en) * | 2018-03-27 | 2022-09-20 | 东北电力大学 | Method for calculating vibration acceleration of turn-to-turn short circuit of transformer winding |
| CN110988525A (en) * | 2019-11-19 | 2020-04-10 | 国网河北省电力有限公司电力科学研究院 | Evaluation method for impact of repeated short circuit on power transformer in short time |
| CN110988525B (en) * | 2019-11-19 | 2022-06-10 | 国网河北省电力有限公司电力科学研究院 | Method for evaluating impact of repeated short circuit on power transformer in short time |
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