CN105205236A - Finite element computing method of short-circuit impulse current of transformer - Google Patents
Finite element computing method of short-circuit impulse current of transformer Download PDFInfo
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- CN105205236A CN105205236A CN201510573313.0A CN201510573313A CN105205236A CN 105205236 A CN105205236 A CN 105205236A CN 201510573313 A CN201510573313 A CN 201510573313A CN 105205236 A CN105205236 A CN 105205236A
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Abstract
A finite element computing method of short-circuit impulse current of a transformer comprises steps as follows: a three-dimensional model of transformer windings and an iron core is established according to the size of a transformer; excitation conditions and boundary conditions of the transformer windings are set; an outer circuit with a coupling calculation function is established; short-circuit current under different faults is calculated, and the change relation between the short-circuit current and time is acquired.
Description
Technical field
The invention belongs to the technical field of transformer software emulation, particularly a kind of emulation mode of power transformer burst external short circuit dash current.
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.
In the fault statistics of transformer at the scene, fault caused by short circuit account for very high proportion, table 1-1 is the fault statistics to power transformer in a period of time, can see that from table the transformer of 110kV and above in quinquenniad has an accident 235 times altogether, the accident wherein caused due to Damage by Short Circuit has 87 times, accounts for 37.02% of the total casual clearing station of transformer time
Table 11994-1999 whole nation 110kV and above transformer short-circuit damage accident number of units statistics
| The statistics time | The total number of units of accident | Short circuit accident number of units | Account for casual clearing station time ratio |
| 1995 | 59 | 29 | 49.2％ |
| 1996 | 58 | 28 | 50.0％ |
| 1997 | 55 | 21 | 38.2％ |
| 1998 | 63 | 26 | 41.0％ |
| 1999 | 49 | 20 | 40.8％ |
| Add up to | 284 | 125 | 44.0％ |
Be not difficult to find out from above data, because inadequate the caused accident of transformer anti-short circuit capability during short circuit is the principal element affecting power transformer safe operation.This mainly due to transformer be short-circuited fault time, will the short-circuit current much larger than normal electrical flow valuve be flow through in winding conducting wire, thus will produce the very large magnetic field of numerical value in transformer.Under the effect in short-circuit current and short circuit magnetic field, wire will be subject to very huge electrodynamic action, and short-circuit electromotive force is about normal value and obtains hundreds of times.If the short circuit resistivity design of transformer is reasonable not, then may there is deformation in the structure of winding under the effect of short-circuit electromotive force, even cause winding across collapsing.Therefore, by Finite Element Method under transformer burst external short circuit fault, the short-circuit current flowing through Transformer Winding carries out calculating and check is very important.
Summary of the invention
Fundamental purpose of the present invention is: the shortcoming and defect calculating short-circuit current for traditional simplification circuit analytical method and test method(s), short-circuit current under adopting finite element method can calculate the short-circuit impedance of different winding structures and different faults preferably, can simplify workload greatly.The method mainly comprises the following steps:
1. utilize 3 d modeling software (as Inventor) to set up three-dimensional model 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. the driving source arranging high-low pressure winding is external circuit, and adds in winding by the coil section under winding title correspondence;
4. utilize Editcircuit to edit external circuit, need to arrange voltage source and resistance according to system voltage and capacity and coil resistance in external circuit, each coil all needs independent grounding;
5. the calculator function utilizing ANSYSMaxwell to carry is to short-circuit impact electric current I
sccalculate, obtain simulation result.
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;
Accompanying drawing 4 is the calculation flow chart of transformer short-circuit dash current provided by the invention;
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 a kind of finite element method of Transformer Winding short-circuit impact electric current, comprise the following steps:
In three-dimensional software, set up normal transformer realistic model according to transformer size, include 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, there is cushion block between line cake 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, there is cushion block between line cake between each line cake;
High-low pressure winding is set in iron core column, the center superposition of the winding center of circle and iron core column;
The single-turn circular coil 9 arranging 1 of high pressure winding is a coilterminal, and to arrange current direction be clockwise direction, described concrete steps are: adopt surfacesection order to high pressure winding 1 according to xz plane cutting, obtain the cross section of each cake coil of high pressure winding 1, choose and all cross sections are set to coilterminal and the number of turn is set according to physical size, and sense of current is set to clockwise;
The single-turn circular coil 8 arranging 2 of high pressure winding is a coilterminal, and to arrange current direction be clockwise direction, described concrete steps are: adopt surfacesection order to high pressure winding 2 according to xz plane cutting, obtain the cross section of each cake coil of high pressure winding 2, choose and all cross sections are set to coilterminal and the number of turn is set according to physical size, and sense of current is set to counterclockwise;
Utilize winding to name, the energisation mode arranging winding is external circuit, sets up high-low pressure winding respectively and has " circuit-finite element " coupled apparatus, and under adding the coil under each winding to winding;
Utilize editcircuit to be joined in external circuit model by winding device, and according to system voltage grade and short-circuit current estimating system short-circuit impedance Z, evaluation method is as follows:
Wherein U is system voltage, when I is system generation busbar short-circuit fault, and the electric current on bus;
As required by high-low pressure winding winding and system voltage source, short-circuit impedance, coil resistance is connected to become closed-loop path, wherein winding Same Name of Ends ground connection, and arranging voltage source frequency is 50Hz;
To make one and coil resistance in high-low pressure winding winding, line resistance is connected to become closed-loop path, wherein winding Same Name of Ends ground connection;
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;
Domain is set, and to the border of domain according to the conductivity of transformer-cabinet material and magnetic permeability, is set to impedance boundary condition;
Size opposing connection group grid according to real transformer winding is arranged according to onselection, and iron core grid peace is arranged according to inselection;
In result of calculation, obtain short-circuit current curve in time by creating new report according to the variable of high-low pressure winding current, and by statistical conversion in excel form.
Claims (1)
1. the finite element method of a transformer short-circuit dash current is characterized in that, comprises the following steps:
1) 3 d modeling software such as Inventor is utilized to set up three-dimensional model 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) driving source arranging high-low pressure winding is external circuit, and adds in winding by the coil section under winding title correspondence;
4) utilize Editcircuit to edit external circuit, need to arrange voltage source and resistance according to system voltage and capacity and coil resistance in external circuit, each coil all needs independent grounding;
5) calculator function utilizing ANSYSMaxwell to carry is to short-circuit impact electric current I
sccalculate, obtain simulation result.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510573313.0A CN105205236A (en) | 2015-09-10 | 2015-09-10 | Finite element computing method of short-circuit impulse current of transformer |
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| CN201510573313.0A CN105205236A (en) | 2015-09-10 | 2015-09-10 | Finite element computing method of short-circuit impulse current of transformer |
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| CN105205236A true CN105205236A (en) | 2015-12-30 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107194087A (en) * | 2017-05-26 | 2017-09-22 | 云南电网有限责任公司电力科学研究院 | A kind of appraisal procedure in fortune transformer anti-short circuit capability |
| CN107247208A (en) * | 2017-07-20 | 2017-10-13 | 云南电网有限责任公司电力科学研究院 | A kind of transformer shorted-turn fault location positioning method |
| 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 |
| CN112395761A (en) * | 2020-11-17 | 2021-02-23 | 天津航空机电有限公司 | Electromagnetic simulation verification method based on transformer rectifier for aviation |
| CN112560335A (en) * | 2020-12-02 | 2021-03-26 | 西南交通大学 | Multi-objective and structural parameter comprehensive optimization design method for transformer |
| CN116929971A (en) * | 2023-09-15 | 2023-10-24 | 合肥工业大学 | Electromagnetic force load applying and impact current generating platform based on Helmholtz coil |
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| CN104111393A (en) * | 2014-07-16 | 2014-10-22 | 云南电力试验研究院（集团）有限公司电力研究院 | Comprehensive evaluation analysis method for power transformer short-circuiting resistance |
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| CN104111393A (en) * | 2014-07-16 | 2014-10-22 | 云南电力试验研究院（集团）有限公司电力研究院 | Comprehensive evaluation analysis method for power transformer short-circuiting resistance |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107194087A (en) * | 2017-05-26 | 2017-09-22 | 云南电网有限责任公司电力科学研究院 | A kind of appraisal procedure in fortune transformer anti-short circuit capability |
| CN107247208A (en) * | 2017-07-20 | 2017-10-13 | 云南电网有限责任公司电力科学研究院 | A kind of transformer shorted-turn fault location positioning method |
| 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 |
| CN112395761A (en) * | 2020-11-17 | 2021-02-23 | 天津航空机电有限公司 | Electromagnetic simulation verification method based on transformer rectifier for aviation |
| CN112560335A (en) * | 2020-12-02 | 2021-03-26 | 西南交通大学 | Multi-objective and structural parameter comprehensive optimization design method for transformer |
| CN112560335B (en) * | 2020-12-02 | 2022-11-22 | 西南交通大学 | Multi-objective and structural parameter comprehensive optimization design method for transformer |
| CN116929971A (en) * | 2023-09-15 | 2023-10-24 | 合肥工业大学 | Electromagnetic force load applying and impact current generating platform based on Helmholtz coil |
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