CN110060857A - A kind of power transformer that can eliminate excitation surge current and its application method - Google Patents
A kind of power transformer that can eliminate excitation surge current and its application method Download PDFInfo
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- CN110060857A CN110060857A CN201811442044.4A CN201811442044A CN110060857A CN 110060857 A CN110060857 A CN 110060857A CN 201811442044 A CN201811442044 A CN 201811442044A CN 110060857 A CN110060857 A CN 110060857A
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- winding
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- surge current
- low pressure
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
- H01F27/38—Auxiliary core members; Auxiliary coils or windings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/04—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/001—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection limiting speed of change of electric quantities, e.g. soft switching on or off
- H02H9/002—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection limiting speed of change of electric quantities, e.g. soft switching on or off limiting inrush current on switching on of inductive loads subjected to remanence, e.g. transformers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses the power transformers that one kind can eliminate excitation surge current, are related to electric field, primarily to eliminating the excitation surge current phenomenon of traditional transformer；The transformer includes transformer body；The transformer body is integrated with high-voltage winding and low pressure winding；The transformer body is also integrated with electronic converter and auxiliary winding, and the electronic converter includes the converter A for realizing the AC/DC transformation and converter B for realizing DC/AC transformation；The converter A and auxiliary winding are electrically connected, and converter B and low pressure winding are electrically connected.Demagnetization is theoretical to be connected electronic converter by auxiliary winding and administers to transformer body excitation surge current phenomenon the present invention is based on filling, by iron core magnetize and the iron core stabilization of transformer body or the requirement that zero distorts are realized in operation of demagnetize.The links such as omitting external switch and measurement of residual magnetism, and magnetic field modulation will be by the constraint of breaker opening and closing lock time.
Description
Technical field
The present invention relates to electric field, specifically a kind of power transformer that can eliminate excitation surge current and its user
Method.
Background technique
When transformer excitation flow refers to the charging of transformer full voltage, residual flux and transformer before putting into iron core
When flow direction caused by operating voltage when investment is identical, due to saturation magnetic flux of the total magnetic flux considerably beyond iron core
The transient current generated in its winding.The characteristics of transformer excitation flow, is: the electricity of power grid when size of shoving is put into transformer
Press the factors such as phase angle, transformer core residual flux and power-supply system impedance related, when peak inrush current appears in transformer investment
Voltage is through zero crossing moment (the moment magnetic flux is peak value)；And contain DC component and higher harmonic components in shoving, and at any time
Between decay, die-away time depend on circuit resistance and reactance, general high-power transformer be about 5 ~ 10s, small capacity transformer
About 0.2s or so.
Its magnetic state is caused to be sent out due to the effect of transformer iron core magnetic bias and remanent magnetism in substation, large-scale plant area, power plant
Raw distortion induces a lot of transformer station high-voltage side bus exceptions, the event of adjacent generator differential protection and back-up protection malfunction.To electricity
Factory, power grid and user bring tremendous influence, or even the accidents such as the complete power loss of entire plant area, unit and system sectionalizing is caused to be seen repeatly
It is not fresh.
For the excitation surge current phenomenon occurred in electric system, domestic and foreign scholars propose the method for a variety of improvement at present.
Be mainly included in 1. closing circuit current-limiting reactor, 2. resistor insertion method, 3. switching transformer when carry out the operations such as split-phase to limit
Make the transient process of shove amplitude and burning voltage；There are also 4. encouraged by changing the distribution weakening of first and second winding of transformer
The method that magnetic shoves.There is document to propose the electronic power switch being made of Thyristors in series valve group, by control switching angle, realizes
Voltage over zero is open-minded when switching；There are also propose a kind of transformer excitation flow inhibition side based on the control of switching voltage amplitude
Case；Shandong University Wang Yang studies the prediction of transformer core remnant magnetism state, proposes a kind of transformer core remanent magnetism
Prediction technique provides corresponding reference frame for measurement of residual magnetism.Foreign scholar Diksha Ahire proposes a kind of with fuzzy
The Voltage Drop fast adjuster of logic controller alleviates power transformer excitation surge current, can compensate well under voltage
Drop and the generation for reducing excitation surge current；In more load transformer handoff procedures, Mehrdad Rostami research team is proposed
Pow(point-on-wave) control strategy, on the basis of assuming that iron core remanent magnetism is zero, it is determined that optimal reclosure time is simultaneously controlled
Breaker processed closes a floodgate at the respective voltage peak of three-phase to inhibit excitation surge current.But this control strategy is apparent the disadvantage is that wanting
Ask iron core remanent magnetism to be necessary for zero, due to the interrupting process of practical breaker be it is random, the chance that remanent magnetism is exactly zero is less, limit
The key of this method large-scale application processed is to be difficult to accurately obtain iron core remanent magnetism parameter.
Currently, reply excitation surge current bring transformer magnetic state changes most effective measure in numerous governance approach
For this technology of phase selection.Switch motion is mainly carried out at specific voltage, electric current moment by control breaker, makes electromagnetism
The influence of transient problems bring is reduced to minimum.A large amount of research has shown that any company and manufacturing firm, with excitation surge current waveform
Feature is according to the malfunction measure prevented when dropping, it cannot be guaranteed that 100% not malfunction of transformer differential protection, difference are only to miss
Dynamic number number.
Power transformer stable operation also faces new challenges and threatens under the new situation in summary, for excitation surge current
The problem of causing transformer can not work normally, people haveed no alternative but take for a long time due to lacking effective counter-measure
The method that various " hiding ", " keeping away " are shoved.Simultaneously as the characteristic of excitation surge current causes most people to think that static exciter is gushed
Stream can not be suppressed or eliminated thoroughly, and there is also some urgent problems to be solved.
Summary of the invention
The purpose of the present invention is to provide power transformers and its application method that one kind can eliminate excitation surge current, with solution
Certainly the problems mentioned above in the background art.
To achieve the above object, the invention provides the following technical scheme:
A kind of power transformer that can eliminate excitation surge current, including transformer body；The transformer body is integrated with high pressure
Winding and low pressure winding, high-voltage winding and low pressure winding are respectively equipped with high-voltage connection terminal and low-voltage wiring terminal, wherein high
Crimping line terminals are electrically connected with high-voltage switch gear, and low-voltage wiring terminal is electrically connected with low tension switch；The transformer body is also
It is integrated with electronic converter and auxiliary winding, the electronic converter includes the converter A for realizing AC/DC transformation and is used for
Realize the converter B of DC/AC transformation；The converter A and auxiliary winding are electrically connected, and converter B electrically connects with low pressure winding
It connects.
As a further solution of the present invention: the auxiliary winding, high-voltage winding and low pressure winding are arranged in parallel in transformation
The side of device main body.
As a further solution of the present invention: the auxiliary winding is laid in the bottom of transformer body iron core.
As a further solution of the present invention: the high-voltage winding and low pressure winding constitute magnetic coupling, low pressure winding and auxiliary
Winding composition is helped to be electrically coupled.
As a further solution of the present invention: further including the radiator for being installed on transformer body.
As a further solution of the present invention: there are two the two sides for being symmetricly set on transformer body for the radiator.
The application method of above-mentioned power transformer, including idle-loaded switching-on stage and failure removal stage,
Wherein the idle-loaded switching-on stage includes:
1-1) closed low switchs, and accesses low pressure winding；
It 1-2) injects AC electric current from converter A to low pressure winding and establishes growth form AC and magnetize and modulate magnetic flux；
1-3) when iron core magnetic flux rises to synchronous magnetic flux rated value, closed high switch accesses high-voltage winding.
The failure removal stage includes:
High-voltage switch gear 2-1) is disconnected, high-voltage winding is cut off；
2-2) continued to inject AC electric current to high-voltage winding by auxiliary winding from converter B, establishes attenuation type AC demagnetization modulation magnetic
It is logical；
2-3) when attenuation type AC demagnetization modulation magnetic flux is reduced to zero, converter B is closed.
Compared with prior art, the beneficial effects of the present invention are:
1, the present invention is based on filling, demagnetization is theoretical to connect electronic converter to transformer body excitation surge current phenomenon by auxiliary winding
Administered, by iron core magnetize and operation of demagnetizing realize transformer body iron core is stable or the requirement of zero distortion, save
The links such as external switch and measurement of residual magnetism are gone, and magnetic field modulation will be by the constraint of breaker opening and closing lock time.
2, the present invention, which cleverly magnetizes with growth form AC, modulates magnetic flux and attenuation type AC magnetizes and modulates magnetic flux to realize pair
Bias, remanent magnetism and excitation surge current completely eliminate and inhibit, and thinking is novel.Open reply transformer excitation flow problem
One new way, solve people's " hiding " for a long time shove, the present Research of " keeping away " bias.It embodies are as follows:
(1) it in order to avoid the excitation surge current that idle-loaded switching-on generates, is magnetized using growth form AC and modulates magnetic flux realization iron core without impact
Smooth transition, can effectively weaken switching transient galvanomagnetic-effect, reduce switch closing operation shove and overvoltage, steadily
Eliminate the generation of excitation surge current；
(2) it for failure removal, is magnetized using attenuation type AC and modulates magnetic flux and demagnetize, bring excitation surge current when eliminating excision,
And for next time close a floodgate magnetize (no remanent magnetism) lay the foundation.
Transformer service life can effectively be extended by this kind of staged magnetization, demagnetization strategy, and brought for differential protection
New cognition.
3, the present invention is demagnetized tactful using iron core, and the iron core of transformer body is made to retract no remnant magnetism state, pre- without remanent magnetism
It surveys, changes the status of the difficult and intermediate pre-magnetizing device complex redundancy of prediction of traditional transformer appearance, there is system structure
Simply, high reliablity and the characteristics of mobility strong.
Detailed description of the invention
Fig. 1 is the structural schematic diagram that can eliminate the power transformer of excitation surge current.
Fig. 2 is the circuit diagram that can eliminate the power transformer of excitation surge current.
Fig. 3 is the application method schematic diagram that can eliminate the power transformer of excitation surge current.
Fig. 4 is that growth form magnetizes schematic diagram.
Fig. 5 is attenuation type demagnetization schematic diagram.
In figure: 1- transformer body, 2- electronic converter, 3- auxiliary winding, 4- converter A, 5- converter B, 6- low pressure
Connecting terminal, 7- high-voltage connection terminal, 8- radiator, 9- high-voltage winding, 10- low pressure winding, 11- high-voltage switch gear, 12- low pressure are opened
Close, 13- growth form AC magnetize modulate magnetic flux, 14- attenuation type AC demagnetization modulation magnetic flux, 15- magnetic coupling, 16- are electrically coupled.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Embodiment 1
Please refer to Fig. 1~2, in the embodiment of the present invention, a kind of power transformer that can eliminate excitation surge current, including transformer master
Body 1；The transformer body 1 is integrated with high-voltage winding 9 and low pressure winding 10, and high-voltage winding 9 and low pressure winding 10 are equipped with
There are high-voltage connection terminal 7 and low-voltage wiring terminal 6, wherein high-voltage connection terminal 7 is electrically connected with high-voltage switch gear 11, low pressure wiring
Terminal 6 is electrically connected with low tension switch 12, for controlling the input of height current voltage；
The transformer body 1 is also integrated with electronic converter 2 and auxiliary winding 3, the electronic converter 2 include for realizing
The converter A4 of the AC/DC transformation and converter B5 converted for realizing DC/AC；The converter A4 and auxiliary winding 3 are electrically
Connection, converter B5 and low pressure winding 10 are electrically connected；
For the compactedness for improving single unit system, in the present embodiment, the auxiliary winding 3, high-voltage winding 9 and low pressure winding 10 are in parallel
The side of transformer body 1 is set, and wherein auxiliary winding 3 is laid in the bottom of 1 iron core of transformer body；The high voltage winding
Group 9 and low pressure winding 10 constitute magnetic coupling 15, and low pressure winding 10 and the composition of auxiliary winding 3 are electrically coupled 16；
It further, further include the radiator 8 for being installed on transformer body 1, there are two be symmetricly set on transformation with the radiator 8
The two sides of device main body 1 guarantee whole proper heat reduction.
Embodiment 2
Please refer to Fig. 3~5, in the embodiment of the present invention, a kind of application method of above-mentioned transformer, including the idle-loaded switching-on stage and therefore
Hinder the excision stage,
Wherein the idle-loaded switching-on stage includes:
1-1) closed low switch 12 accesses low pressure winding 10；
It 1-2) injects AC electric current from converter A4 to low pressure winding 10 and establishes growth form AC and magnetize and modulate magnetic flux 13(corresponding diagram 4
In the t0 moment)；
1-3) when iron core magnetic flux rises to synchronous magnetic flux rated value (the t1 moment in corresponding diagram 4), closed high switch 11 connects
Enter high-voltage winding 9.
After the access of high-voltage winding 9 (the t2 moment in corresponding diagram 4), due to a stable state magnetic flux existing in iron core,
So the iron core of transformer body 1 will not generate excitation surge current phenomenon when idle-loaded switching-on.
The failure removal stage includes:
High-voltage switch gear 11 2-1) is disconnected, the t0 moment in high-voltage winding 9(corresponding diagram 5 is cut off)；
2-2) continued to inject AC electric current to high-voltage winding 9 by auxiliary winding 3 from converter B5, establishes attenuation type AC demagnetization modulation
The t1 moment in magnetic flux 14(corresponding diagram 5)；
(the t2 moment in corresponding diagram 5) 2-3) is modulated when magnetic flux 14 is reduced to zero when attenuation type AC demagnetizes, closes converter B5.
After converter B5 closing, the iron core magnetic flux of transformer body 1 is reduced to zero, to realize wanting for no remanent magnetism
It asks, eliminating iron core measurement of residual magnetism link, 1 closing iron core of transformer body does not magnetize and establishes contact next time.
The working principle of the invention and effective effect are as follows:
The present invention is based on filling, demagnetization is theoretical to connect electronic converter 2 to 1 excitation surge current phenomenon of transformer body by auxiliary winding 3
Administered, by iron core magnetize and operation of demagnetizing realize transformer body 1 iron core is stable or the requirement of zero distortion, save
The links such as external switch and measurement of residual magnetism are gone, and magnetic field modulation will be by the constraint of breaker opening and closing lock time.
The present invention, which cleverly magnetizes with growth form AC, modulates magnetic flux 13 and attenuation type AC magnetizes and modulates magnetic flux 14 to realize
Completely eliminating and inhibit to bias, remanent magnetism and excitation surge current, thinking are novel.Open reply transformer excitation flow problem
A new way, solve people's " hiding " for a long time shove, the present Research of " keeping away " bias.It embodies are as follows:
(1) it in order to avoid the excitation surge current that idle-loaded switching-on generates, is magnetized using growth form AC and modulates the realization iron core of magnetic flux 13 without punching
The smooth transition hit, can effectively weaken switching transient galvanomagnetic-effect, reduce switch closing operation shove and overvoltage, put down
The steady generation for eliminating excitation surge current；
(2) it for failure removal, is magnetized using attenuation type AC and modulates magnetic flux 14 and demagnetize, bring excitation to gush when eliminating excision
Stream, and for next time close a floodgate magnetize (no remanent magnetism) lay the foundation.
Transformer service life can effectively be extended by this kind of staged magnetization, demagnetization strategy, and brought for differential protection
New cognition.
The present invention makes the iron core of transformer body 1 retract no remnant magnetism state using iron core demagnetization strategy, pre- without remanent magnetism
It surveys, changes the status of the difficult and intermediate pre-magnetizing device complex redundancy of prediction of traditional transformer appearance, there is system structure
Simply, high reliablity and the characteristics of mobility strong.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie
In the case where without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power
Benefit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent elements of the claims
Variation is included within the present invention.Any reference signs in the claims should not be construed as limiting the involved claims.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
The other embodiments being understood that.
Claims (7)
1. one kind can eliminate the power transformer of excitation surge current, including transformer body (1)；Transformer body (1) collection
At having high-voltage winding (9) and low pressure winding (10), high-voltage winding (9) and low pressure winding (10) are respectively equipped with high-voltage connection terminal
(7) and low-voltage wiring terminal (6), wherein high-voltage connection terminal (7) is electrically connected with high-voltage switch gear (11), low-voltage wiring terminal
(6) low tension switch (12) are electrically connected with；It is characterized in that, the transformer body (1) be also integrated with electronic converter (2) and
Auxiliary winding (3), the electronic converter (2) they include the converter A(4 for realizing AC/DC transformation) and for realizing DC/AC
The converter B(5 of transformation)；The converter A(4) be electrically connected with auxiliary winding (3), converter B(5) and low pressure winding (10)
It is electrically connected.
2. the power transformer according to claim 1 that excitation surge current can be eliminated, which is characterized in that the auxiliary winding
(3), high-voltage winding (9) and low pressure winding (10) are arranged in parallel in the side of transformer body (1).
3. the power transformer according to claim 2 that excitation surge current can be eliminated, which is characterized in that the auxiliary winding
(3) it is laid in the bottom of transformer body (1) iron core.
4. the power transformer according to claim 1 that excitation surge current can be eliminated, which is characterized in that the high-voltage winding
(9) and low pressure winding (10) constitutes magnetic coupling (15), and low pressure winding (10) and auxiliary winding (3) composition are electrically coupled (16).
5. the power transformer according to claim 1 to 4 that excitation surge current can be eliminated, which is characterized in that further include
It is installed on the radiator (8) of transformer body (1).
6. the power transformer according to claim 5 that excitation surge current can be eliminated, which is characterized in that the radiator
(8) there are two the two sides for being symmetricly set on transformer body (1).
7. the application method of the power transformer that can eliminate excitation surge current as described in claim 1-6 is any, feature exist
In, including idle-loaded switching-on stage and failure removal stage,
Wherein the idle-loaded switching-on stage includes:
1-1) closed low switch (12) accesses low pressure winding (10)；
It 1-2) injects AC electric current from converter A(4) to low pressure winding (10) and establishes growth form AC and magnetize and modulate magnetic flux (13)；
1-3) when iron core magnetic flux rises to synchronous magnetic flux rated value, closed high switchs (11), accesses high-voltage winding (9)；
The failure removal stage includes:
High-voltage switch gear (11) 2-1) are disconnected, are cut off high-voltage winding (9)；
2-2) continued to inject AC electric current to high-voltage winding (9) by auxiliary winding (3) from converter B(5), establishes attenuation type AC and move back
Magnetic modulates magnetic flux (14)；
2-3) when attenuation type AC demagnetization modulation magnetic flux (14) is reduced to zero, converter B(5 is closed).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811442044.4A CN110060857A (en) | 2018-11-29 | 2018-11-29 | A kind of power transformer that can eliminate excitation surge current and its application method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811442044.4A CN110060857A (en) | 2018-11-29 | 2018-11-29 | A kind of power transformer that can eliminate excitation surge current and its application method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110060857A true CN110060857A (en) | 2019-07-26 |
Family
ID=67315854
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811442044.4A Pending CN110060857A (en) | 2018-11-29 | 2018-11-29 | A kind of power transformer that can eliminate excitation surge current and its application method |
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| Country | Link |
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| CN (1) | CN110060857A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110661241A (en) * | 2019-10-16 | 2020-01-07 | 广东电网有限责任公司 | Method, device and equipment for suppressing inrush current of transformer |
| CN112216491A (en) * | 2020-10-12 | 2021-01-12 | 合肥工业大学 | Hybrid transformer direct-current magnetic bias suppression system and method based on magnetic compensation mechanism |
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| CN108666974A (en) * | 2018-05-15 | 2018-10-16 | 西安交通大学 | Transformer based on magnetic linkage control and excitation surge current suppressing method |
| CN208142828U (en) * | 2018-04-11 | 2018-11-23 | 王炎 | A kind of micro- auxiliary switching-in device that shoves of no-load transformer |
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2018
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| CN102945735A (en) * | 2012-11-06 | 2013-02-27 | 保定天威集团有限公司 | Pre-magnetizing transformer with voltage regulator and manufacture method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110661241A (en) * | 2019-10-16 | 2020-01-07 | 广东电网有限责任公司 | Method, device and equipment for suppressing inrush current of transformer |
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| CN112216491A (en) * | 2020-10-12 | 2021-01-12 | 合肥工业大学 | Hybrid transformer direct-current magnetic bias suppression system and method based on magnetic compensation mechanism |
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Application publication date: 20190726 |