CN106549359A - A kind of SVC transformators - Google Patents
A kind of SVC transformators Download PDFInfo
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- CN106549359A CN106549359A CN201510598642.0A CN201510598642A CN106549359A CN 106549359 A CN106549359 A CN 106549359A CN 201510598642 A CN201510598642 A CN 201510598642A CN 106549359 A CN106549359 A CN 106549359A
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- protection
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- transformator
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Abstract
The invention provides a kind of SVC transformators, the low-pressure side sleeve pipe of transformator is connected with SVC buses；The high-pressure side neutral ground of the transformator；The high voltage side of transformer sleeve pipe is connected with SVC points of common connection；Each phase winding of the high voltage side of transformer is provided with tap, and the SVC points of common connection is connected with power system.The invention provides a kind of SVC transformators; transformer differential protection is combined with bus differential protection, is fully able to realization and is recognized and cut off low-pressure side winding turns fault progression is that other are mutually grounded or phase earth fault of the same name and low-pressure side winding casing tube flashover develop into outside angle other and be mutually grounded or phase earth fault of the same name outside angle over the ground.
Description
Technical field
The present invention relates to a kind of transformator, and in particular to a kind of SVC transformators.
Background technology
2013, Brazilian trie Britney Jean Spears water power was sent in project, installed static nothing in 500kV transformer stations
Reactive power compensation installations (SVC).Due to trie Britney Jean Spears water power very long, the about 2966km that sends passage, when
After two sets of SVC of passage put into operation, the voltage support for passage is played into positive role.With traditional SVC master
The mode of connection is different, and transformator is accessed power train by the SVC that Brazilian trie Britney Jean Spears water power is sent in project
System, this design and protection to SVC transformators propose very high requirement.Step down side winding turns pair
Break down or low-pressure side winding casing tube flashover breaks down, outer other phases of transformer low voltage side angle can be involved
Ground connection or it is of the same name be mutually grounded, but current transformer differential protection electric current access way cannot monitor the failure.
The content of the invention
To overcome drawbacks described above, the invention provides a kind of design of SVC tranformer protections and collocation method, will
Distribution transformer differential protection is combined with bus differential protection, is fully able to be met and quickly recognize and cut off low-pressure side
Fault progression is that other are mutually grounded or phase earth fault of the same name outside angle to winding turns over the ground, meets engineering actual demand.
For achieving the above object, the present invention is achieved by the following technical solutions：
A kind of SVC transformators, the low-pressure side sleeve pipe of the transformator are connected with SVC buses；The transformator
High-pressure side neutral ground；The high voltage side of transformer sleeve pipe is connected with SVC points of common connection；The change
The on high-tension side each phase winding of depressor is provided with tap, and the SVC points of common connection is connected with power system.
The transformator includes 4 single-phase two windings step-down transformers.
The electricity of side chopper and middle chopper is completely gone here and there in the two windings step-down transformer high-pressure side and 3/2 wiring
Current transformer connects；The two windings step-down transformer low-pressure side is connected with angle inner sleeve current transformer, point
Gei not A, B, C three-phase offer two groups of current transformers of every phase.
The high voltage side of transformer is Y type bind modes, and each phase winding is provided with 5 set of taps, corresponding electric
Pressure is respectively
The step down side is △ bind modes.
The step down side is △ bind modes, and each winding joins end to end, and draws three in junction and leads
Line is connected one to one with SVC device three-phase bus.
The structure of the current transformer of step down side sleeve pipe is TPY type structures.
The tranformer protection is protected using the protection of dual electric parameters and a set of non-electric quantity.
The dual electric parameters protection includes differential quick-break and longitudinal difference protection, restricted ground protection, excessively stream
Protection, zero-sequencedirectional protection, stub protection or over-excitation protection.
The parameter of the non-electric quantity protection includes winding temperature, gas, pressure and oil level.
A kind of SVC tranformer protections design provided with immediate prior art ratio, the present invention and configuration,
Its transformer differential protection is combined with bus differential protection, is fully able to realization and is recognized and cut off low-pressure side winding turns
Fault progression is that other are mutually grounded or phase earth fault of the same name and low-pressure side winding casing tube flashover outside angle over the ground
Open up for outside angle other be mutually grounded or phase earth fault of the same name.
Description of the drawings
Fig. 1 is SVC device wiring diagram；
Fig. 2 is SVC transformator main wiring diagrams；
Fig. 3 is SVC transformator electric parameters relaying configuration figures；
Fig. 4 is that fault progression is that other are mutually grounded or phase earth fault of the same name point outside angle to low-pressure side winding turns over the ground
Analysis figure；
Fig. 5 develops into outside angle other for low-pressure side winding casing tube flashover and is mutually grounded or phase single-phase-to-earth fault analysis of the same name
Figure.
Specific embodiment
The present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings：
As shown in Figure 1, SVC device connection transformer low-pressure side sleeve pipe, high voltage side of transformer sleeve pipe pass through
Points of common connection at mouthful is joined directly together with power system.
As shown in Figure 2, transformator includes 4 two single-phase winding step-down transformers, wherein 1 single-phase
For spare phase.
As shown in Figure 3, protection equipment for transformer adopts duplicate system retrofit, i.e., protected using dual electric parameters
Shield and a set of non-electric quantity are protected.Wherein, electric parameters protection includes differential quick-break and longitudinal difference protection, restricted
Ground protection, overcurrent protection, zero-sequencedirectional protection, stub protection and over-excitation protection.Non-electric quantity is protected
Shield includes winding temperature, gas, pressure and oil level.As double set electric parameters protect the analog quantity of collection complete
Identical, all defencive function configurations are identical, when the protection of a set of electric parameters is broken down or needs maintenance,
Another set of electric parameters protection continues to work, has ensured the safe operation of SVC transformators.
In system short-circuit, common P levels current transformer only considers stable state degree of unsaturation, and its iron core will
Tend to saturation quickly, it is impossible to accurately judge and recognize the various system failures.To guarantee protective current transformer,
During system transient modelling will not saturation, while protecting with the interior half breaker branch current transformer type of standing
Hold consistent, it is to avoid differential protection malfunction, improve height reliability and the sensitivity of tranformer protection, according to this
A kind of SVC tranformer protections design and the configuration of invention, TPY is selected in its each side in SVC transformer differentials loop
Level current transformer.
As shown in Figure 4, SVC transformer differential protections are given to combine with bus differential protection, is fully able to
Satisfaction quickly recognize and cut off " low-pressure side winding turns over the ground fault progression be angle outside other be mutually grounded or same famous prime minister
The concrete methods of realizing of earth fault ".When failure occurs in diverse location (TA2 sides or TA3 sides), when
Trouble point from sleeve pipe it is close when, wherein a set of device for transformer differential protection starts threshold, and be provided with can not
Effectively recognize and cut off failure, but bus differential protection energy action message；As bus differential protection is taken with tranformer protection
From different CT, for this kind of failure, bus differential protection and transformer differential protection in fact serve protection pair
The function of matching somebody with somebody.It is analyzed according to the installation site of each CT, protection does not have dead band.
As shown in Figure 5, SVC transformer differential protections are given to combine with bus differential protection, is fully able to
Satisfaction is quickly recognized and cuts off that " low-pressure side winding casing tube flashover develops into outside angle other and is mutually grounded or of the same name connects
The concrete methods of realizing of earth fault ".For the configuration that SVC transformators are three single-phase transformers, there is phase
Between short trouble probability very little.Low-pressure side winding casing tube flashover develops into outside angle other and is mutually grounded or of the same name
Phase earth fault falls within the rare failure of comparison.When failure occurs in diverse location (TA2 sides or TA3 sides),
Second set of differential protective device of transformer is because insufficient sensitivity, it is impossible to cut off failure；But first set transformator
Differential protection and bus differential protecting have sensitivity to the failure, can quickly cut off failure.Due to mother
Difference protection takes from different CT from tranformer protection, for this kind of failure, bus differential protection and transformer differential are protected
Shield in fact serves the double functions of matching somebody with somebody of protection.It is analyzed according to the installation site of each CT, protection is without dead
Area.
It is to be understood that, present invention and specific embodiment are intended to prove technical side provided by the present invention
The practical application of case, should not be construed as limiting the scope of the present invention.Those skilled in the art are at this
Under bright spirit and principle are inspired, can various modifications may be made, equivalent or improve.But these change or repair
Change and applying in pending protection domain.
Claims (10)
1. a kind of SVC transformators, it is characterised in that：The low-pressure side sleeve pipe of the transformator is connected with SVC buses
Connect；The high-pressure side neutral ground of the transformator；The high voltage side of transformer sleeve pipe is commonly connected with SVC
Point is connected；Each phase winding of the high voltage side of transformer is provided with tap, the SVC points of common connection with
Power system connects.
2. transformator according to claim 1, it is characterised in that：The transformator include 4 it is single-phase
Two winding step-down transformers.
3. transformator according to claim 2, it is characterised in that：The two windings step-down transformer is high
Pressure side and 3/2 wiring are completely gone here and there the current transformer of side chopper and middle chopper and are connected；The two windings drop
Pressure transformer low-pressure side is connected with angle inner sleeve current transformer, is provided per phase two to A, B, C three-phase respectively
Group current transformer.
4. transformator according to claim 1, it is characterised in that：The high voltage side of transformer is Y types
Bind mode, each phase winding are provided with 5 set of taps, and corresponding voltage is respectively
5. transformator according to claim 1, it is characterised in that：The step down side joins for △
Knot mode.
6. transformator according to claim 1, it is characterised in that：The step down side joins for △
Knot mode, each winding join end to end, and draw one a pair of three of the wires and SVC device three-phase bus in junction
Should connect.
7. transformator according to claim 1, it is characterised in that：The electric current of step down side sleeve pipe
The structure of transformer is TPY type structures.
8. transformator according to claim 1, it is characterised in that：The tranformer protection is using dual
Change electric parameters protection and a set of non-electric quantity is protected.
9. transformator according to claim 8, it is characterised in that：The dual electric parameters protection bag
Include differential quick-break and longitudinal difference protection, restricted ground protection, overcurrent protection, zero-sequencedirectional protection, short leg
Protection or over-excitation protection.
10. transformator according to claim 8, it is characterised in that：The ginseng of the non-electric quantity protection
Number includes winding temperature, gas, pressure and oil level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510598642.0A CN106549359A (en) | 2015-09-18 | 2015-09-18 | A kind of SVC transformators |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510598642.0A CN106549359A (en) | 2015-09-18 | 2015-09-18 | A kind of SVC transformators |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106549359A true CN106549359A (en) | 2017-03-29 |
Family
ID=58362301
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510598642.0A Pending CN106549359A (en) | 2015-09-18 | 2015-09-18 | A kind of SVC transformators |
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| Country | Link |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100237835A1 (en) * | 2009-03-18 | 2010-09-23 | Mitsubishi Electric Corporation | Reactive power compensator |
| CN201946984U (en) * | 2010-12-25 | 2011-08-24 | 广东明阳龙源电力电子有限公司 | SVC compensation device |
-
2015
- 2015-09-18 CN CN201510598642.0A patent/CN106549359A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100237835A1 (en) * | 2009-03-18 | 2010-09-23 | Mitsubishi Electric Corporation | Reactive power compensator |
| CN201946984U (en) * | 2010-12-25 | 2011-08-24 | 广东明阳龙源电力电子有限公司 | SVC compensation device |
Non-Patent Citations (5)
| Title |
|---|
| 孙茗: "大型发电机变压器组成套保护双重化配置及有关问题", 《电力自动化设备》 * |
| 康鑫: "500kV变压器保护配置与维护探讨", 《陕西电力》 * |
| 张健康: "大容量SVC对变压器差动保护的影响及解决措施", 《电力系统自动化》 * |
| 李颖瑾: "500kV变电站主变差动保护用TPY级电流互感器参数优化", 《山东电力技术》 * |
| 熊卿: "新型配电变压器一体化STATCOM技术研究", 《电工技术学报》 * |
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Application publication date: 20170329 |