CN202586312U - Coupled solid-state current limiter of single-phase multiple-winding transformer - Google Patents
Coupled solid-state current limiter of single-phase multiple-winding transformer Download PDFInfo
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- CN202586312U CN202586312U CN 201220124498 CN201220124498U CN202586312U CN 202586312 U CN202586312 U CN 202586312U CN 201220124498 CN201220124498 CN 201220124498 CN 201220124498 U CN201220124498 U CN 201220124498U CN 202586312 U CN202586312 U CN 202586312U
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- 238000004804 winding Methods 0.000 title claims abstract description 130
- 238000010168 coupling process Methods 0.000 claims description 43
- 238000005859 coupling reaction Methods 0.000 claims description 43
- 230000008878 coupling Effects 0.000 claims description 33
- 238000009434 installation Methods 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 2
- 239000003990 capacitor Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 230000009897 systematic effect Effects 0.000 description 3
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- JEIPFZHSYJVQDO-UHFFFAOYSA-N ferric oxide Chemical compound O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
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- 238000000034 method Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
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Abstract
The utility model discloses a coupled solid-state current limiter of a single-phase multiple-winding transformer, wherein an automatically coupled or magnetically coupled multiple-winding transformer is adopted as a current limiter connected to an interface device of a main circuit of a power grid. When the coupled solid-state current limiter of the single-phase multiple-winding transformer normally operates, all bridge circuits connected to windings at the outmost layer and the innermost layer are opened; the windings at the outmost layer and the innermost layer is equivalent to short-circuiting; magnetic shielding is formed on the windings in the middle layer; therefore, voltage of the current limiter is limited in a lower level; influence of the current limiter on the system can be ignored; when the coupled solid-state current limiter of the single-phase multiple-winding transformer is failed, voltage of the windings of the multi-winding transformer in each layer is divided according to respective reactance values; and the voltage class of a thyristor in a rectification bridge circuit and the total cost of the current limiter can be effectively reduced. The solid-state current limiter disclosed by the utility model is more applied to industrial application in a high-voltage power grid.
Description
Technical field
The utility model relates to the Fault Current Limiting Device of high-voltage fence, especially a kind of single-phase multi winding transformer coupled mode solid-state current limiter.
Background technology
Be applied to the short circuit current limiter of electric power system, some requires below generally must satisfying:
Low ESR or zero impedance maybe can be ignored to systematic influence is very little during 1 normal the operation;
2 can respond short trouble fast;
Can short circuit current be limited in the preset value through current-limiting impedance during 3 failure current limits;
4 volumes are little, and are in light weight, and cost is low.
At the mesolow electrical network; Common a few money flow restricters all have certain application prospect like saturation type flow restricter, solid-state current limiter and superconductive current limiter at present, but in high-voltage fence; Higher voltage grade and capacity of short circuit then cause the bottleneck of technology or economic aspect to the application with occluder.In high-voltage fence current limliting field, what application prospect was arranged is the serial-resonant flow restricter at present, and its topological structure is as shown in Figure 1; For preventing overvoltage; Lightning arrester 1 is parallelly connected with capacitor 2, when normally moving, turn-offs with capacitor 2 parallelly connected thyristors 3; Series resonance takes place with inductance 4 in capacitor 2, and the flow restricter equiva lent impedance approaches zero; During the circuit failed because, thyristor 3 is triggered open-minded, and by bypass, inductance 4 seals in the circuit limiting short-circuit current to capacitor 2 through antihunt circuit 5.When the advantage of this flow restricter is normally to move, because electric capacity and inductance generation series resonance, when the impedance that seals in circuit approaches zero short trouble basically,, system is not almost had influence, and thyristor being in off state, loss is less, need not heat abstractor.But its shortcoming is also very remarkable: it is open-minded that system requires thyristor to trigger as early as possible, otherwise between electric capacity and thyristor, can form bigger voltage and current oscillation, and the operating mode of electric capacity and thyristor will be very abominable, and this has proposed very high requirement to control system; Thyristor is reliably open-minded under need the adverse circumstances when fault, can not guarantee but open reliability.
Chinese patent 200420022582.5 disclosed a kind of novel electric power electric type short circuit current limiters; As shown in Figure 2; Then well solved the existing problem of above serial-resonant flow restricter, the bridge circuit standard-sized sheet of being made up of thyristor T1, T2, T3 and T4 parallelly connected with coupling transformer TR2 secondary when normally moving is logical, and secondary is equivalent to " short circuit "; The flow restricter equiva lent impedance is merely the transformer primary leakage reactance, and is very little to systematic influence; During the system failed because, direct current reactor Ld does not have time-delay and inserts limiting short-circuit current automatically; When monitoring control devices after line fault; In half cycle, turn-off the secondary bridge circuit, secondary winding open circuit, flow restricter is equivalent to a reactor and seals in the circuit fault current limiting at this moment.In the current limliting process, flow restricter responds fault fast, and significantly electromagnetic viscosimeter can not take place, and can guarantee reliable current limliting.But if this flow restricter is used for high-pressure system, after short trouble took place, flow restricter need be born all or part of system power supply voltage; Though work in dark saturation condition owing to coupling transformer during current limliting; Secondary voltage is lower than original edge voltage, but because the electric pressure of system own is higher, the secondary bridge circuit the electric pressure that must bear also be appreciable; This causes the flow restricter cost higher, directly has influence on its practical applications in high-voltage fence.
Summary of the invention
The utility model has proposed a kind of single-phase multi winding transformer coupled mode solid-state current limiter to the deficiency of prior art.
The single-phase multi winding transformer coupling solid-state current limiter that the utility model proposes is made up of single-phase multi winding transformer and single-phase current limliting bridge circuit.
Described single-phase multi winding transformer is formed by the coaxial installation of multilayer winding, can adopt two kinds of structures of iron core formula or open-core type.
Single-phase current limliting bridge circuit comprises single-phase rectification bridge and a direct current reactor; Single-phase rectification bridge is made up of four thyristors; Two thyristors of last brachium pontis are formed common cathode, and two thyristors of following brachium pontis are formed anode altogether, and direct current reactor is connected to the single-phase rectification bridge common cathode and is total between the anode.
The outermost layer of single-phase multi winding transformer and innermost layer winding all with a single-phase current limliting bridge circuit mutually and connect.
According to the different winding connections of single-phase multi winding transformer, single-phase multi winding transformer coupling solid-state current limiter can be divided into single-phase self-coupling formula multi winding transformer coupling solid-state current limiter and single-phase magnetic coupling type multi winding transformer coupling solid-state current limiter,
Single-phase self-coupling formula multi winding transformer is forward series connection successively from the outermost layer winding to the innermost layer winding; And be series between system power supply and the load; Outermost layer winding and innermost layer winding two ends each and connect a single-phase current limliting bridge circuit; Can be between outermost layer and the innermost layer winding as required in addition, with outermost layer and innermost layer is non-conterminous and each other at interval certain which floor winding two ends and connect a single-phase current limliting bridge circuit;
The outermost layer winding of single-phase magnetic coupling type multi winding transformer passes through the magnetic field coupling with time outer winding and innermost layer winding with time internal layer winding; Be not electrically connected and have; The forward series connection successively from inferior outer winding to inferior internal layer winding; Constitute the major loop winding, and be serially connected with between system power supply and the line load, outermost layer winding and innermost layer winding are respectively and connect a single-phase current limliting bridge circuit.
The beneficial effect of the utility model:
1, as the single-phase multi winding transformer of flow restricter core devices, when normally moving in system voltage drop very low, can ignore systematic influence.
2, because winding adopts hierarchy, during the system failure in the bridge circuit electric pressure of thyristor can effectively be reduced, the winding number of plies is many more, then bridge circuit thyristor voltage grade is low more, this extremely helps the application of this flow restricter in high-voltage fence.
3, in the flow restricter if adopt the hollow-core construction transformer; The thyristor voltage grade can further be reduced in the inboard bridge circuit; The capacity of direct current reactor is also with the reducing and reduce greatly of the most inboard winding voltage-time and area integration in the bridge circuit, and this extremely has and utilizes the cost that reduces flow restricter.
Description of drawings
Fig. 1 serial-resonant flow restricter topological structure;
Fig. 2 is a novel electric power electric type short circuit current limiter;
Fig. 3 is the multi winding transformer coupling Bridge Type Solid State Current Limiter topological structure of scheme 1;
Fig. 4 is the multi winding transformer coupling Bridge Type Solid State Current Limiter topological structure of scheme 2.
Embodiment
The practical implementation method of the utility model is following:
As shown in Figure 3, single-phase self-coupling formula multi winding transformer coupling solid-state current limiter is made up of single-phase self-coupling formula multi winding transformer and the first single-phase current limliting bridge circuit and the second single-phase current limliting bridge circuit.
Single-phase self-coupling formula multi winding transformer is formed by the coaxial installation of multilayer winding, can adopt two kinds of structures of core type or open-core type, and each winding is forward series connection successively from outside to inside, and the winding after the series connection is serially connected with between system power supply Us and the load Zload;
The first single-phase current limliting bridge circuit comprises single-phase rectification bridge and direct current reactor Ld1 who is made up of thyristor T1, T2, T3 and T4; In the single-phase rectification bridge; The thyristor T1, the T3 common cathode that are positioned at brachium pontis connect; Be positioned at thyristor T2, the T4 anode connection altogether of brachium pontis down, two end points respectively at the outermost layer winding in the middle of each brachium pontis link to each other, and direct current reactor Ld1 is connected to the common cathode of single-phase rectification bridge together between the anode.The second single-phase current limliting bridge circuit is identical with the first single-phase current limliting bridge arrangement.
As shown in Figure 4, single-phase magnetic coupling type multi winding transformer coupling solid-state current limiter is made up of single-phase magnetic coupling type multi winding transformer and the 3rd single-phase current limliting bridge circuit and the 4th single-phase current limliting bridge circuit.
Single-phase magnetic coupling type multi winding transformer is formed by the coaxial installation of multilayer winding; Can adopt two kinds of structures of core type or open-core type; Outermost layer winding and innermost layer winding are coupled with inferior skin and time internal layer winding magnetic respectively, are not electrically connected the forward series connection successively from inferior outer winding to inferior internal layer winding and have; Constitute the major loop winding, the major loop winding is serially connected with between system power supply Us and the load Zload.
The 3rd single-phase current limliting bridge circuit is identical with the first single-phase current limliting bridge arrangement with the 4th single-phase current limliting bridge circuit.Link to each other with two end points of single-phase magnetic coupling type multi winding transformer outermost layer winding respectively in the middle of each brachium pontis of the 3rd single-phase current limliting bridge circuit and the 4th single-phase current limliting bridge circuit.
Single-phase multi winding transformer coupling solid-state current limiter in the utility model, when system normally moved, all bridge circuit standard-sized sheets were logical in the flow restricter; With bridge circuit mutually and the winding that connects equivalence be " short circuit "; The pressure drop of winding two ends can be considered zero, for single-phase self-coupling formula multi winding transformer coupling solid-state current limiter, is " short circuit " with single-phase rectification bridge and the outermost layer winding that connects, innermost layer winding and middle certain which floor winding equivalence in the single-phase self-coupling formula multi winding transformer; Remaining winding is owing to be between the winding of " short circuit "; The magnetic field that is produced is separately shielded by the winding of both sides " short circuit ", and leakage flux and winding leakage reactance are very little, and corresponding leakage reactance pressure drop is very low; For single-phase magnetic coupling type multi winding transformer coupling solid-state current limiter; Can equivalence be " short circuit " with rectifier bridge and the outermost layer winding that connects and innermost layer winding in the single-phase magnetic coupling type multi winding transformer; Same because layer winding is for the magnetic screening action of middle winding with, the leakage reactance of middle winding and leakage reactance pressure drop are very low.
After system's failed because; Direct current reactor in the flow restricter in all bridge circuits does not have time-delay and inserts circuit automatically, and the climbing of limiting short-circuit current and amplitude thereof are after control system monitors system short-circuit fault; Block all thyristor trigger impulses of bridge circuit synchronously; And in half cycle, turn-off all bridge circuits, this moment, flow restricter was equivalent to the reactor that is formed by many windings in series, through it the short circuit current steady-state value was limited in the preset value.Meanwhile; After system's failed because, all or part of flow restricter end that adds to of system power supply voltage treats that all bridge circuits turn-off; Flow restricter is in the stable state current limliting during stage, and each winding that is serially connected with circuit in the multi winding transformer is then shared voltage by reactance value separately.If flow restricter voltage that the end is born is U; If transformer is by n layer windings in series, and each winding reactance value equates that then the voltage of every layer of winding is U/n; For single-phase self-coupling formula multi winding transformer coupling solid-state current limiter, the electric pressure of thyristor then is U/n in each bridge circuit.For single-phase magnetic coupling type multi winding transformer coupling solid-state current limiter, suppose that its outermost layer equates with time outer umber of turn and innermost layer equates that with time internal layer umber of turn if adopt core construction, the thyristor voltage grade is U/n in the bridge circuit of inside and outside both sides; If adopt hollow-core construction; The electric pressure of thyristor is about U/n in the bridge circuit of the outside; And the electric pressure of thyristor is much smaller than U/n in the inboard bridge circuit, and its reason is to be between innermost layer winding and time internal layer winding Air Coupling, and the magnetic flux that passes the innermost layer winding is less than inferior internal layer winding; The degree of coupling is lower between therefore above two windings, and the innermost layer winding voltage is much smaller than inferior internal layer winding.
Claims (1)
1. single-phase multi winding transformer coupled mode solid-state current limiter is characterized in that: comprise single-phase multi winding transformer and single-phase current limliting bridge circuit;
Described single-phase multi winding transformer is formed by the coaxial installation of multilayer winding, can adopt two kinds of structures of iron core formula or open-core type;
Single-phase current limliting bridge circuit comprises single-phase rectification bridge and a direct current reactor; Single-phase rectification bridge is made up of four thyristors; Two thyristors of last brachium pontis are formed common cathode, and two thyristors of following brachium pontis are formed anode altogether, and direct current reactor is connected to the single-phase rectification bridge common cathode and is total between the anode;
The outermost layer of single-phase multi winding transformer and innermost layer winding all with a single-phase current limliting bridge circuit mutually and connect;
According to the different winding connections of single-phase multi winding transformer, single-phase multi winding transformer coupling solid-state current limiter can be divided into single-phase self-coupling formula multi winding transformer coupling solid-state current limiter and single-phase magnetic coupling type multi winding transformer coupling solid-state current limiter;
Single-phase self-coupling formula multi winding transformer is forward series connection successively from the outermost layer winding to the innermost layer winding; And be series between system power supply and the load; Outermost layer winding and innermost layer winding two ends each and connect a single-phase current limliting bridge circuit; Can be between outermost layer and the innermost layer winding as required in addition, with outermost layer and innermost layer is non-conterminous and each other at interval certain which floor winding two ends and connect a single-phase current limliting bridge circuit;
The outermost layer winding of single-phase magnetic coupling type multi winding transformer passes through the magnetic field coupling with time outer winding and innermost layer winding with time internal layer winding; Be not electrically connected and have; The forward series connection successively from inferior outer winding to inferior internal layer winding; Constitute the major loop winding, and be serially connected with between system power supply and the line load, outermost layer winding and innermost layer winding are respectively and connect a single-phase current limliting bridge circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220124498 CN202586312U (en) | 2012-03-29 | 2012-03-29 | Coupled solid-state current limiter of single-phase multiple-winding transformer |
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| CN 201220124498 CN202586312U (en) | 2012-03-29 | 2012-03-29 | Coupled solid-state current limiter of single-phase multiple-winding transformer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102611089A (en) * | 2012-03-29 | 2012-07-25 | 浙江大学 | Coupled mode solid-state current limiter of single-phase multi-winding transducer |
| CN105356434A (en) * | 2015-11-27 | 2016-02-24 | 中电普瑞科技有限公司 | Novel bridge type solid-state fault current limiter and using method thereof |
-
2012
- 2012-03-29 CN CN 201220124498 patent/CN202586312U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102611089A (en) * | 2012-03-29 | 2012-07-25 | 浙江大学 | Coupled mode solid-state current limiter of single-phase multi-winding transducer |
| CN102611089B (en) * | 2012-03-29 | 2014-07-02 | 浙江大学 | Coupled mode solid-state current limiter of single-phase multi-winding transducer |
| CN105356434A (en) * | 2015-11-27 | 2016-02-24 | 中电普瑞科技有限公司 | Novel bridge type solid-state fault current limiter and using method thereof |
| CN105356434B (en) * | 2015-11-27 | 2019-03-22 | 中电普瑞科技有限公司 | A kind of novel bridge type solid-state fault current limiter and its application method |
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Granted publication date: 20121205 Effective date of abandoning: 20140702 |
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| RGAV | Abandon patent right to avoid regrant |