CN107103161A - The emulated computation method that a kind of cumulative effect influences on transformer anti-short circuit capability - Google Patents
The emulated computation method that a kind of cumulative effect influences on transformer anti-short circuit capability Download PDFInfo
- Publication number
- CN107103161A CN107103161A CN201710377730.7A CN201710377730A CN107103161A CN 107103161 A CN107103161 A CN 107103161A CN 201710377730 A CN201710377730 A CN 201710377730A CN 107103161 A CN107103161 A CN 107103161A
- Authority
- CN
- China
- Prior art keywords
- transformer
- short circuit
- field
- cumulative effect
- circuit current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Computer Hardware Design (AREA)
- Evolutionary Computation (AREA)
- Geometry (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Management, Administration, Business Operations System, And Electronic Commerce (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses the emulated computation method that a kind of cumulative effect influences on transformer anti-short circuit capability, including：According to the practical structures of transformer, the three-dimensional finite element electromagnetic-field simulation model of transformer is set up；Before calculating cumulative effect three-phase symmetrical short circuit current flow I is passed through in three-dimensional finite element electromagnetic-field simulation modelmaxWhen transformer stray field, according to the maximum short circuit current I of stray field calculating transformer1；To the default deformation defect of three-dimensional finite element electromagnetic-field simulation model addition, the three-dimensional artificial defect model of transformer after cumulative effect is obtained；After calculating cumulative effect three-phase symmetrical short circuit current flow I is passed through in three-dimensional artificial defect modelmaxWhen transformer stray field, according to the maximum short circuit current I of transformer after leakage field field computation cumulative effect2；Contrast I1And I2, obtain influence of the cumulative effect to transformer anti-short circuit capability.The present invention reaches the purpose of simulated experiment by emulation mode, it is easy to accomplish, cost is low.
Description
Technical field
The present invention relates to transformer simulation calculation field, more particularly to a kind of cumulative effect is to transformer anti-short circuit capability shadow
Loud emulated computation method.
Background technology
Transformer is one of highly important equipment in power system, and its operation conditions not only influences the peace of itself
Entirely, and the stability and reliability of whole Operation of Electric Systems are affected.With the fast development of national grid, transformer
Capacity of short circuit constantly increases, and this brings bigger risk to the safe operation of transformer.Short circuit current flow increase suffered by transformer,
Short-circuit dynamic force suffered by winding also increases therewith, after transformer is undergoing multiple short-circuit impact, after short-circuit dynamic force accumulation
Winding is deformed, and the damage of inside transformer insulation status is even resulted in when serious, and this phenomenon is referred to as the accumulation effect of transformer
Should.
At present, cumulative effect has become a major reason of transformer short-circuit damage.And for occurring winding deformation
Transformer for, although be not meant to the accident that is damaged immediately, but when transformer is rushed by big excessively stream, overvoltage again
Hitting lower may cause the generation of transformer fault.Therefore, it is necessary to anti-short for occurring the winding progress after cumulative effect deformation
Road capability analysis.
But, cause currently for cumulative effect after the winding of transformer deforms, its anti-short circuit capability is maximum short
Road electric current is less by the analysis how to change.
The content of the invention
The invention provides the emulated computation method that a kind of cumulative effect influences on transformer anti-short circuit capability, methods described
Including：
According to the practical structures of transformer, the three-dimensional finite element electromagnetic-field simulation model of the transformer is set up；
Before calculating cumulative effect three-phase symmetrical short circuit current flow I is passed through in three-dimensional finite element electromagnetic-field simulation modelmaxShi Suoshu
The stray field of transformer, the maximum short circuit current I of transformer according to the leakage field field computation1；
To the default deformation defect of three-dimensional finite element electromagnetic-field simulation model addition, transformer after cumulative effect is obtained
Three-dimensional artificial defect model；
After calculating cumulative effect three-phase symmetrical short circuit current flow I is passed through in three-dimensional artificial defect modelmaxShi Suoshu transformers
Stray field, according to the maximum short circuit current I of transformer after the leakage field field computation cumulative effect2；
Contrast I1And I2, obtain influence of the cumulative effect to the transformer anti-short circuit capability.
Preferably, described added to the three-dimensional finite element electromagnetic-field simulation model presets deformation defect, including：
The one kind or many of axial deformation, loosening and width to deformation is added to the three-dimensional finite element electromagnetic-field simulation model
Kind.
Preferably, the maximum short circuit current I of the transformer according to the leakage field field computation1, including：
Magnetic induction intensity maximum B in Magnetic Leakage Field of Transformer before acquisition cumulative effect1；
Pass through the B1With the preset threshold short-circuit force of the transformer, the I is calculated1。
Preferably, according to the maximum short circuit current I of transformer after the leakage field field computation cumulative effect2, including：
Magnetic induction intensity maximum B in Magnetic Leakage Field of Transformer after acquisition cumulative effect2；
Pass through the B2With the preset threshold short-circuit force, the I is obtained2。
The technical scheme that the present invention is provided can include the following benefits：
The embodiment of the present invention provides the emulated computation method that a kind of cumulative effect influences on transformer anti-short circuit capability, described
Method includes：According to the practical structures of transformer, the three-dimensional finite element electromagnetic-field simulation model of the transformer is set up；Calculate tired
Before product effect three-phase symmetrical short circuit current flow I is passed through in three-dimensional finite element electromagnetic-field simulation modelmaxThe leakage field of Shi Suoshu transformers
, the maximum short circuit current I of transformer according to the leakage field field computation1；To the three-dimensional finite element electromagnetic-field simulation mould
The default deformation defect of type addition, obtains the three-dimensional artificial defect model of transformer after cumulative effect；Calculate after cumulative effect three
Dimension emulation defect model is passed through three-phase symmetrical short circuit current flow ImaxThe stray field of Shi Suoshu transformers, according to the leakage field field computation
The maximum short circuit current I of transformer after cumulative effect2；Contrast I1And I2, cumulative effect is obtained to the transformer anti-short circuit capability
Influence.The embodiment of the present invention is emulated by deforming the stray field of front and rear transformer to cumulative effect, and is calculated tired
Influence of the product effect to transformer anti-short circuit capability, so that it is determined that whether the transformer for occurring cumulative effect can also continue to use.
The present invention reaches the purpose of simulated experiment by emulation mode, it is easy to accomplish, cost is low.
It should be appreciated that the general description of the above and detailed description hereinafter are only exemplary and explanatory, not
Can the limitation present invention.
Brief description of the drawings
In order to illustrate more clearly of technical scheme, letter will be made to the required accompanying drawing used in embodiment below
Singly introduce, it should be apparent that, for those of ordinary skills, without having to pay creative labor,
Other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the simulation calculation side that a kind of cumulative effect provided in an embodiment of the present invention influences on transformer anti-short circuit capability
The schematic flow sheet of method；
Fig. 2 is a kind of method flow for calculating transformer maximum short circuit current before cumulative effect provided in an embodiment of the present invention
Schematic diagram；
Fig. 3 is a kind of method flow for calculating transformer maximum short circuit current after cumulative effect provided in an embodiment of the present invention
Schematic diagram.
Embodiment
The embodiment of the present invention provides the emulated computation method that a kind of cumulative effect influences on transformer anti-short circuit capability, referring to
Fig. 1, including：
Step S100：According to the practical structures of transformer, the three-dimensional finite element electromagnetic-field simulation mould of the transformer is set up
Type.
In embodiments of the present invention, using 3 d modeling software, such as Inventor softwares, according to transformer around
The practical structures size of the original papers such as group, iron core, folder, arm-tie and mailbox, sets up the three-dimensional finite element electromagnetic-field simulation of transformer
Model.
In specific implementation process, high-pressure side winding can by identical size cake formula structure composition, low-pressure side can adopt
With the cake formula structure composition of another identical size, it is not physically contacted between each line cake.High pressure winding and low pressure winding cover respectively
In iron core column, the center of circle of winding and the center superposition of iron core column.According to the actual size of coil set high-pressure side winding and
The number of turn of low-pressure side winding, and high-pressure side winding current direction is set to clockwise, low-pressure side winding current direction is set
It is set to counterclockwise.In addition, to iron core, winding material, folder, arm-tie and postal in three-dimensional finite element electromagnetic-field simulation model
The electrical conductivity and magnetic conductivity of case are configured.
Step S200：Before calculating cumulative effect three-phase symmetrical short circuit current flow is passed through in three-dimensional finite element electromagnetic-field simulation model
ImaxThe stray field of Shi Suoshu transformers, the maximum short circuit current I of transformer according to the leakage field field computation1。
In specific implementation process, using the field computation device of ANSYS softwares, to before cumulative effect in three-dimensional finite element electromagnetism
Field simulation model is passed through three-phase symmetrical short circuit current flow Imax, can obtain the intensity of the Magnetic Leakage Field of Transformer, cloud atlas, polar plot with
And the electric power regularity of distribution on each line cake, wherein, Imax=K × I0, K is the default correction factor of the transformer, I0To become
The virtual value of electric current when depressor is normally run.
In a kind of possible embodiment, the maximum short circuit current of the transformer according to the leakage field field computation
I1Embodiment, as shown in Fig. 2 including：
Step S201：Magnetic induction intensity maximum B in Magnetic Leakage Field of Transformer before acquisition cumulative effect1。
According to being passed through three-phase symmetrical short circuit current flow ImaxThe intensity of the Magnetic Leakage Field of Transformer obtained, contrast obtains accumulation
Magnetic induction intensity maximum B in Magnetic Leakage Field of Transformer before effect1。
Step S202：Pass through the B1With the preset threshold short-circuit force of the transformer, the maximum of the transformer is calculated
Short circuit current flow I1。
According to formula F=B1I1L, wherein, F is the preset threshold short-circuit force of the transformer, and described become is obtained by calculating
The maximum short circuit current I of depressor1, wherein, the maximum short circuit current I of the transformer1It can be held to occur transformer before cumulative effect
The maximum short circuit current received.
Step S300：To the default deformation defect of three-dimensional finite element electromagnetic-field simulation model addition, cumulative effect is obtained
The three-dimensional artificial defect model of transformer afterwards.
In embodiments of the present invention, the deformation defect is the deformation that the transformer cumulative effect is produced.
In a kind of possible embodiment, default deformation defect is added to the three-dimensional finite element electromagnetic-field simulation model
Embodiment, including：
The one kind or many of axial deformation, loosening and width to deformation is added to the three-dimensional finite element electromagnetic-field simulation model
Kind.
In embodiments of the present invention, deformation when can actually occur cumulative effect according to transformer is to three-dimensional finite element electromagnetism
Field simulation model is adjusted.In specific implementation process, the perimeter strip of deformation can be set according to deformation during cumulative actual effect
Part, then default axial deformation, loosening or width are adjusted to the model of deformation to three-dimensional finite element electromagnetic-field simulation model, from
And obtain the three-dimensional artificial defect model of transformer after cumulative effect.
Step S400：After calculating cumulative effect three-phase symmetrical short circuit current flow I is passed through in three-dimensional artificial defect modelmaxWhen institute
The stray field of transformer is stated, according to the maximum short circuit current I of transformer after the leakage field field computation cumulative effect2。
In a kind of possible embodiment, according to the maximum short circuit electricity of transformer after the leakage field field computation cumulative effect
Flow I2, as shown in figure 3, including：
Step S401：Magnetic induction intensity maximum B in Magnetic Leakage Field of Transformer after acquisition cumulative effect2。
According to being passed through three-phase symmetrical short circuit current flow ImaxThe intensity of Magnetic Leakage Field of Transformer, right after the cumulative effect obtained
Than magnetic induction intensity maximum B in Magnetic Leakage Field of Transformer after acquisition cumulative effect1。
Step S402：Pass through the B2With the preset threshold short-circuit force, the I is obtained2。
According to formula F=B2I2L, wherein, F is preset threshold short-circuit force, and the maximum short of the transformer is obtained by calculating
Road electric current I2, wherein, the maximum short circuit current I of the transformer2To occur the maximum short circuit that transformer after cumulative effect can be born
Electric current.
Step S500：Contrast I1And I2, obtain influence of the cumulative effect to the transformer anti-short circuit capability.
In specific implementation process, Δ I/I is calculated1, wherein, the Δ I=I1-I2, Δ I/I1For transformation after cumulative effect
Device can bear the ratio of maximum short circuit current reduction, i.e. influence of the cumulative effect to the transformer anti-short circuit capability.
The embodiment of the present invention provides the emulated computation method that a kind of cumulative effect influences on transformer anti-short circuit capability, described
Method includes：According to the practical structures of transformer, the three-dimensional finite element electromagnetic-field simulation model of the transformer is set up；Calculate tired
Before product effect three-phase symmetrical short circuit current flow I is passed through in three-dimensional finite element electromagnetic-field simulation modelmaxThe leakage field of Shi Suoshu transformers
, the maximum short circuit current I of transformer according to the leakage field field computation1；To the three-dimensional finite element electromagnetic-field simulation mould
The default deformation defect of type addition, obtains the three-dimensional artificial defect model of transformer after cumulative effect；Calculate after cumulative effect three
Dimension emulation defect model is passed through three-phase symmetrical short circuit current flow ImaxThe stray field of Shi Suoshu transformers, according to the leakage field field computation
The maximum short circuit current I of transformer after cumulative effect2；Contrast I1And I2, cumulative effect is obtained to the transformer anti-short circuit capability
Influence.The embodiment of the present invention is emulated by deforming the stray field of front and rear transformer to cumulative effect, and is calculated tired
Influence of the product effect to transformer anti-short circuit capability, so that it is determined that whether the transformer for occurring cumulative effect can also continue to use.
The present invention reaches the purpose of simulated experiment by emulation mode, it is easy to accomplish, cost is low.
Those skilled in the art will readily occur to its of the present invention after the disclosure that specification and practice are invented here is considered
Its embodiment.The application be intended to the present invention any modification, purposes or adaptations, these modifications, purposes or
Person's adaptations follow the general principle of the present invention and including undocumented common knowledge in the art of the invention
Or conventional techniques.Description and embodiments are considered only as exemplary, and true scope and spirit of the invention are by following
Claim is pointed out.
Invention described above embodiment is not intended to limit the scope of the present invention..
Claims (4)
1. a kind of emulated computation method that cumulative effect influences on transformer anti-short circuit capability, it is characterised in that methods described bag
Include：
According to the practical structures of transformer, the three-dimensional finite element electromagnetic-field simulation model of the transformer is set up；
Before calculating cumulative effect three-phase symmetrical short circuit current flow I is passed through in three-dimensional finite element electromagnetic-field simulation modelmaxShi Suoshu transformations
The stray field of device, the maximum short circuit current I of transformer according to the leakage field field computation1；
To the default deformation defect of three-dimensional finite element electromagnetic-field simulation model addition, the three-dimensional of transformer after cumulative effect is obtained
Emulate defect model；
After calculating cumulative effect three-phase symmetrical short circuit current flow I is passed through in three-dimensional artificial defect modelmaxThe leakage field of Shi Suoshu transformers
, according to the maximum short circuit current I of transformer after the leakage field field computation cumulative effect2；
Contrast I1And I2, obtain influence of the cumulative effect to the transformer anti-short circuit capability.
2. the method as described in claim 1, it is characterised in that described to be added to the three-dimensional finite element electromagnetic-field simulation model
Default deformation defect, including：
The one or more of axial deformation, loosening and width to deformation are added to the three-dimensional finite element electromagnetic-field simulation model.
3. the method as described in claim 1, it is characterised in that the maximum of the transformer according to the leakage field field computation
Short circuit current flow I1, including：
Magnetic induction intensity maximum B in Magnetic Leakage Field of Transformer before acquisition cumulative effect1；
Pass through the B1With the preset threshold short-circuit force of the transformer, the I is calculated1。
4. method as claimed in claim 3, it is characterised in that according to transformer after the leakage field field computation cumulative effect most
Big short circuit current flow I2, including：
Magnetic induction intensity maximum B in Magnetic Leakage Field of Transformer after acquisition cumulative effect2；
Pass through the B2With the preset threshold short-circuit force, the I is obtained2。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710377730.7A CN107103161B (en) | 2017-05-25 | 2017-05-25 | Simulation calculation method for influence of cumulative effect on short-circuit resistance of transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710377730.7A CN107103161B (en) | 2017-05-25 | 2017-05-25 | Simulation calculation method for influence of cumulative effect on short-circuit resistance of transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107103161A true CN107103161A (en) | 2017-08-29 |
| CN107103161B CN107103161B (en) | 2021-04-20 |
Family
ID=59669439
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710377730.7A Active CN107103161B (en) | 2017-05-25 | 2017-05-25 | Simulation calculation method for influence of cumulative effect on short-circuit resistance of transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107103161B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109858074A (en) * | 2018-12-13 | 2019-06-07 | 云南电网有限责任公司电力科学研究院 | A kind of simulation method of the transformer oil flow surge based on finite volume method |
| CN109975625A (en) * | 2017-12-27 | 2019-07-05 | 特变电工衡阳变压器有限公司 | Study the test method and device of the radial unstability key factor of short-circuit of power transformer |
| 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 |
| CN111983350A (en) * | 2020-08-11 | 2020-11-24 | 云南电网有限责任公司电力科学研究院 | Method for analyzing current impact on power transformer |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103267921A (en) * | 2013-05-14 | 2013-08-28 | 国家电网公司 | Method for verifying anti-short-circuit capacity of transformer |
| CN104331567A (en) * | 2014-11-11 | 2015-02-04 | 广东电网有限责任公司佛山供电局 | Method and system for predicting false protection action of heavy gas of compact transformer |
| CN105260501A (en) * | 2015-09-10 | 2016-01-20 | 云南电网有限责任公司电力科学研究院 | Leakage magnetic field and winding stress calculation method during sudden shirt circuit of transformer |
| JP2016092950A (en) * | 2014-11-04 | 2016-05-23 | アール・ビー・コントロールズ株式会社 | Power source device |
| CN106446372A (en) * | 2016-09-12 | 2017-02-22 | 广东电网有限责任公司电力科学研究院 | Method and device for computing electromagnetic field of three-phase transformer under A-phase short-circuit state |
| CN206193149U (en) * | 2016-11-24 | 2017-05-24 | 云南电网有限责任公司电力科学研究院 | Transformer winding deformation detection device |
-
2017
- 2017-05-25 CN CN201710377730.7A patent/CN107103161B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103267921A (en) * | 2013-05-14 | 2013-08-28 | 国家电网公司 | Method for verifying anti-short-circuit capacity of transformer |
| JP2016092950A (en) * | 2014-11-04 | 2016-05-23 | アール・ビー・コントロールズ株式会社 | Power source device |
| CN104331567A (en) * | 2014-11-11 | 2015-02-04 | 广东电网有限责任公司佛山供电局 | Method and system for predicting false protection action of heavy gas of compact transformer |
| CN105260501A (en) * | 2015-09-10 | 2016-01-20 | 云南电网有限责任公司电力科学研究院 | Leakage magnetic field and winding stress calculation method during sudden shirt circuit of transformer |
| CN106446372A (en) * | 2016-09-12 | 2017-02-22 | 广东电网有限责任公司电力科学研究院 | Method and device for computing electromagnetic field of three-phase transformer under A-phase short-circuit state |
| CN206193149U (en) * | 2016-11-24 | 2017-05-24 | 云南电网有限责任公司电力科学研究院 | Transformer winding deformation detection device |
Non-Patent Citations (3)
| Title |
|---|
| 徐肖伟 等: "电力变压器绕组短路力三维动态仿真", 《云南电力技术》 * |
| 李林达 等: "电力变压器短路累积效应研究综述", 《变压器》 * |
| 符杨 等: "基于短路冲击累积效应的电力变压器状态检测系统", 《上海电力学院学报》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109975625A (en) * | 2017-12-27 | 2019-07-05 | 特变电工衡阳变压器有限公司 | Study the test method and device of the radial unstability key factor of short-circuit of power transformer |
| CN109975625B (en) * | 2017-12-27 | 2021-02-12 | 特变电工衡阳变压器有限公司 | Test method and device for researching key factors of short-circuit radial instability of power transformer |
| CN109858074A (en) * | 2018-12-13 | 2019-06-07 | 云南电网有限责任公司电力科学研究院 | A kind of simulation method of the transformer oil flow surge based on finite volume method |
| 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 |
| CN111983350A (en) * | 2020-08-11 | 2020-11-24 | 云南电网有限责任公司电力科学研究院 | Method for analyzing current impact on power transformer |
| CN111983350B (en) * | 2020-08-11 | 2022-09-02 | 云南电网有限责任公司电力科学研究院 | Method for analyzing current impact on power transformer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107103161B (en) | 2021-04-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107103161A (en) | The emulated computation method that a kind of cumulative effect influences on transformer anti-short circuit capability | |
| CN104331544B (en) | A kind of three-phase full-bridge converter modeling method based on EIC principles | |
| CN104331567B (en) | Compact transformer grave gas false protection Forecasting Methodology and system | |
| CN102508966B (en) | Covering type grid division method for electromagnetic/electromechanical transient hybrid simulation of AC/DC large power grid | |
| CN110705172A (en) | Method for calculating distribution of instantaneous electric field of transformer under lightning impulse voltage | |
| CN104200055B (en) | Inrush Simulation method and device in the case of extra-high voltage transformer idle-loaded switching-on | |
| CN105260501A (en) | Leakage magnetic field and winding stress calculation method during sudden shirt circuit of transformer | |
| CN107066755A (en) | The emulated computation method of transformer loss under a kind of harmonic current | |
| CN108063442A (en) | A kind of electric power system alternating current power grid real-time simulation apparatus and its emulation mode | |
| CN111478284A (en) | Transformer differential quick-break protection setting method and device | |
| CN104899396A (en) | Fast decoupled flow calculation method of modified coefficient matrix | |
| CN110807243A (en) | Transformer winding equivalent circuit model building method considering frequency-dependent parameters | |
| CN106650075A (en) | Method based on ferromagnetic resonance overvoltage mechanism for assessing the frangibility of distribution network | |
| CN105372521A (en) | Simulation and detection method based on line zero-sequence current in physical model of power distribution network | |
| CN107748311A (en) | A kind of short-circuit ability to bear checking system of power transformer | |
| CN104410159B (en) | Power grid black start overall process checking method based on real-time digital simulation | |
| CN105205294B (en) | A kind of finite element stimulation method of Transformer Winding electric capacity | |
| CN102738790A (en) | Method for calculating positive sequence, negative sequence and zero sequence components of current in power system | |
| CN107783072A (en) | A kind of flexible winding deformation analogue means | |
| CN104897945B (en) | 380V Three-phase Power Systems short circuit current flow fair curve method for building up | |
| CN104078950B (en) | Ultra-high voltage transmission line relay protection method based on positive-sequence break variable differential coefficient matrix | |
| CN104280662B (en) | A kind of power transformer balances winding anti-short circuit capability analysis method | |
| CN104899397B (en) | The treating method and apparatus of fault simulation result | |
| CN107315134A (en) | A kind of current conversion station DC fields Calculation of Safety Distance method and system | |
| CN106159920A (en) | A kind of 10kV electrical network feeder fault processes physics simulator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |