CN100536057C - Parallel circuit breaker - Google Patents

Parallel circuit breaker Download PDF

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Publication number
CN100536057C
CN100536057C CNB2007100529477A CN200710052947A CN100536057C CN 100536057 C CN100536057 C CN 100536057C CN B2007100529477 A CNB2007100529477 A CN B2007100529477A CN 200710052947 A CN200710052947 A CN 200710052947A CN 100536057 C CN100536057 C CN 100536057C
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CN
China
Prior art keywords
parallel
inductance
branch road
branch
core
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CNB2007100529477A
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Chinese (zh)
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CN101145477A (en
Inventor
潘垣
何俊佳
程时杰
袁召
文劲宇
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华中科技大学
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Publication of CN101145477A publication Critical patent/CN101145477A/en
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Abstract

A parallel circuit breaker is provided, which belongs to a high-voltage high-capacity circuit breaker and is to provide automatic current equalization and current limitation and realize the parallel operation of a plurality of arc-extinguishing chambers. The invention comprises parallel-connected 2-4 shunts each comprises an inductance coil and an arc-extinguishing chamber of switches in series connection, wherein the induction coil is enwound around a share iron core to form a coupling inductance coil and the turn number of inductance coil of each shunt is the same. The system current flows through the inductance coils of the 2-4 parallel-connected shunts individually and the arc-extinguishing chambers in series connection with the shunts. The magnetic flux of the magnetic circuit produced by the interaction between the iron core and the inductance coil of each shunt is opposite to that of the other shunts. The arc-extinguishing chamber of each shunt has high capacity, 2-4 parallel-connected arc-extinguishing chambers share the parallel-connected arc-extinguishing chamber device controlled by the same system, or are connected in parallel by 2-4 separated circuit breakers. Based on the structure of the coupling inductance, the invention realizes the parallel-connected on-off of a plurality of arc-extinguishing chambers of the circuit breakers and improves the capacity of on-off of the whole circuit breaker.

Description

Parallel circuit breaker
Technical field
The invention belongs to the high-voltage large-capacity release unit, particularly a kind of large capcity breaker that utilizes coupling inductance, energy automatic current equalizing/current limliting realizes the parallel running of a plurality of arc control device.
Background technology
Along with the continuous reinforcement of electric power system networking, the capacity of short circuit of system is increasing, even has surpassed the specified drop-out current of primary cut-out.In addition, when the port short circuit appearred in heavy-duty generator, the short circuit current of formation also will be above the capacity that cut-offs of present primary cut-out.It is calculated that, when the leading-out terminal short circuit appears in the Three Gorges generating set, short circuit current can reach 300kA, and domestic existing 500kV circuit breaker drop-out current maximum can only reach 63kA, external vacuum circuit-breaker or sulfur hexafluoride breaker also can only reach 80kA and cost an arm and a leg, and existing switching device can not satisfy the requirement of cut-offfing fault current.Solving the excessive problem of Power System Shortcuts electric current can set about from two aspects: develop large capcity breaker on the one hand, develop short-circuit current limiting device on the other hand.It is big to develop jumbo arc-extinguishing chamber of circuit breaker research difficulty, and development cost height, cycle are long, and the short circuit current that is difficult to solve existing system in a short time cut-offs problem; Lot of domestic and international researcher turns to short-circuit current limiting device to sight, and the development of various current-limiting apparatus is in theoretical research stage always, also has very long distance from using, the current limiting measures that adopt in the system have only series reactor at present, can not solve the excessive problem of existing system short circuit current fully, and bring problems such as power consumption and overvoltage.
A kind of new approaches that are different from above-mentioned solution are to use the parallel connection of circuit breaker, make two or more arc control device share short circuit current.The research of this respect at present has parallel running and the big capacity frame-supporting circuit-breaker contact parallel connection that realizes vacuum circuit-breaker by series resistance, inductance, see that Chen Xuan pardons etc. " experimental study of vacuum circuit-breaker interrupting process in parallel ", High-Voltage Electrical Appliances, 1998,05:33-37.Because vacuum arc has the volt-ampere characteristic of rising, therefore be easy to realize parallel running, yet vacuum circuit-breaker be applicable in the following distribution system of 35kV, and generally adopt gas-break switch in the high-pressure system.Electric arc in the gas-break switch belongs to hyperbar electric arc, has the voltage-current characteristic of decline.When short circuit current was cut-off in parallel running, if two arc control device actions are inconsistent, or because other disturbance cause an arc control device branch impedance to become big, and another branch impedance was less relatively.Then electric current shifts to the little branch road of impedance, and the big more arc resistance of electric current is more little, more impels electric current to shift to this branch road, and all electric current is all born by a branch road at last, cut-offs the limit and surpass it; Another branch road arc current is more and more littler, also may be because the self-energy arc-extinguishing chamber gas production causes inadequately and cut-offs failure.As seen directly parallel running of hyperbar arc control device.A kind of scheme is utilized series inductance, resistance, and the parallel connection of realization multiple contact is cut-off, and sees Chen Qian " design problem of big capacity frame-supporting circuit-breaker contact arc-extinguishing system ", low-voltage electrical apparatus, 1982,06:24-26.This scheme utilization increases inductance value and guarantees that each branch road can both the starting the arc and arc energy smooth combustion before current over-zero when contact separates, and series inductance plays the current-sharing effect, realizes the parallel running of circuit breaker multiple contact.But realize above-mentioned current-sharing effect, series inductance can not be too little, and series inductance can be brought very big power consumption when system normally moved.
Summary of the invention
The invention provides a kind of parallel circuit breaker, its purpose is can automatic current equalizing, current limliting, thereby realizes the parallel running of a plurality of arc control device.
A kind of parallel circuit breaker of the present invention, compose in parallel by 2~4 branch roads, every branch road comprises the inductance coil and the switch arc control device of series connection, it is characterized in that: described inductance coil constitutes coupled inductor on common core, the inductance coil equal turn numbers of every branch road, system power flows into the inductance coil of 2~4 branch roads and the arc control device of series connection with it respectively, and the inductance coil of each bar branch road is opposite in twos with the magnetic flux that the inductance coil of other branch road produces in each magnetic circuit of iron core; The arc control device of described every branch road all are jumbo gas arc control device, and 2~4 arc control device in parallel use the arc control device device in parallel by the control of same set of system, perhaps use 2~4 circuit breaker parallel connections that separate.
Described a kind of parallel circuit breaker, it is characterized in that: it is composed in parallel by 2 branch roads, the inductance coil of every branch road is equivalent to no-load voltage ratio and is the former secondary of 1 transformer on public " mouth " shaped iron core, system power flows into two inductance coils by non-same polarity.
Described a kind of parallel circuit breaker is characterized in that: it is composed in parallel by 3 branch roads, and common core adopts the iron core that has 3 core limb structures; Every branch road comprises the inductance coil of two series connection, each inductance coil equal turn numbers, and two inductance coils of every branch road are around in respectively on the different core limbs, and the direction that detours is opposite; In two inductance coils on the same core limb, branch current flows into from the non-same polarity of inductance two coils respectively.
Described a kind of parallel circuit breaker is characterized in that: it is composed in parallel by 4 branch roads, and common core adopts the iron core that has 4 core limb structures; Every branch road comprises the inductance coil of two series connection, and two inductance coils of every branch road are around in respectively on the different core limbs, each branch road inductance coil equal turn numbers; The direction that detours of two series inductance coils is opposite in the same branch road, and the direction that detours of two inductance coils on the same core limb is opposite, and when each branch current equated, the resultant flux that two inductance coils on each core limb produce was zero.
Described a kind of parallel circuit breaker is characterized in that: it is composed in parallel by 4 branch roads, and common core adopts the iron core that has 4 core limb structures; Every branch road comprises the inductance coil of 4 series connection, and 4 inductance coils of every branch road are around in respectively on the different core limbs, each branch road inductance coil equal turn numbers; The direction that detours of 4 series inductance coils is identical in twos in the same branch road, and the direction that detours of 4 inductance coils on the same core limb is identical in twos, if each branch current equates that the resultant flux that each and every one inductance coil of four on each core limb produces is zero.
Described a kind of parallel circuit breaker, it is characterized in that: it is made of two-stage series connection, the first order is composed in parallel by 2 branch roads, the inductance coil of every branch road is on public " mouth " shaped iron core, be equivalent to no-load voltage ratio and be the former secondary of 1 transformer, system power flows into two inductance coils by non-same polarity, is divided into two branch roads and enters the second level; Every the route 2 strip branch roads in the second level compose in parallel, the inductance coil of every strip branch road is on public " mouth " shaped iron core, be equivalent to no-load voltage ratio and be the former secondary of 1 transformer, branch current flows into two inductance coils of sub-branch road by non-same polarity, realizes four arc control device parallel connections.
Following mask body is introduced two arc control device scenario-frame in parallel and principle thereof.
The normal running current and the short circuit current of system are born in two arc control device parallel runnings jointly.In order to overcome SF 6The voltage-current characteristic that circuit breaker descends has adopted a kind of coupling inductance with transformer device structure to the influence that parallel running causes.The inductance coil equal turn numbers of every branch road on public iron core, is equivalent to no-load voltage ratio and is the former secondary of 1 transformer.System power divides two-way, flows into the inductance coil of two branch roads respectively by the direction of non-same polarity, connects with the arc control device of branch road respectively again, produces the opposite magnetic flux of direction in iron core.During normal the operation, coupling inductance presents the transformer leakage impedance, and its resistance value is very little, and loss can be ignored.
During fault, equate that if flow through the electric current of two arc control device the flow direction that two branch currents produce is opposite, equal and opposite in direction in iron core, the magnetic flux in the iron core is zero; If two branch currents differ in size, can produce the magnetic flux of alternation in the iron core, in the inductance coil of two branch roads, induce the electromotive force of alternation, by the law of electromagnetic induction as can be known, this electromotive force makes two branch currents be tending towards equal.When thereby this coupling inductance can guarantee system short-circuit fault, the arc control device of two branch roads were divided equally system power, and parameters such as the rated capacity of the arc control device of two branch roads, capacity of short circuit can be chosen to be 1/2nd of system parameters.
When two arc control device all during conducting, all there is identical currents to pass through in the inductance coil of two branch roads, at this moment coupling inductance presents very little leakage impedance, can not bring extra impedance to the loop.And, be equivalent to the transformer open circuit operation because the inconsistent or separate unit arc control device failure and other reasons of action causes when having only an arc control device conducting, and transformer presents excitation reactance, than high 2~3 orders of magnitude of leakage reactance, and the effective electric current of the single arc control device of restricted passage.
The present invention is based on the coupling inductance structure, realize that a plurality of arc-extinguishing chamber of circuit breaker parallel connections cut-off, improve whole connecting-disconnecting function, the present invention can not bring extra impedance to the loop under normal operation, do not influence the normal current conducting.When breaking down, by utilizing the inductive reaction between each branch road coupling inductance, realize the automatic current equalizing of multiple branch circuit, thereby realize the automatic parallel connection of a plurality of arc-extinguishing chamber of circuit breaker that each arc control device capacity has only the part of power system capacity.Behind part branch road arc extinguishing wherein, residual electricity fails to be convened for lack of a quorum and carry out current limliting under the coupling inductance effect, thereby for the follow-up arc control device that cut-off provide the good condition of cut-offfing, has improved whole connecting-disconnecting function.
Description of drawings
Fig. 1 is the example structure schematic diagram of two arc control device parallel connections of the present invention;
Fig. 2 is the example structure schematic diagram of three arc control device parallel connections of the present invention;
Fig. 3 realizes embodiment 1 structural representation of four arc control device parallel connections for the present invention;
Fig. 4 realizes embodiment 2 structural representations of four arc control device parallel connections for the present invention;
Fig. 5 realizes embodiment 3 structural representations of four arc control device parallel connections for the present invention.
Mark among the figure: loop current 1, left branch current 2, right branch current 3, left coupled inductor 4, right coupled inductor 5, left arc control device 6, right arc control device 7.
Embodiment
Among Fig. 1, around left coupled inductor 4, the right coupled inductor 5 of two equal turn numbers, be the structure of a similar single-phase transformer on employing " mouth " shaped iron core; Loop current 1 flows into from the non-same polarity of coil, and the flow direction that makes left branch current 2, right branch current 3 produce in iron core is opposite.
Left side arc control device 6, right arc control device 7 can adopt two independently circuit breakers, also can adopt two arc control device that use identical controlling organization, thereby help two arc control device contact synchronization actions.In high-pressure system, arc control device use SF 6Make arc-extinguishing medium.Left arc control device 3, right arc control device 4 can use the breaking device of other type in concrete the application.
Common core adopts the iron core as three-phase core type transformer magnetic circuit among Fig. 2, comprises three core limbs; Every branch road comprises the inductance coil of two series connection, each inductance coil equal turn numbers.Two inductance coils of every branch road are around in respectively on the different core limbs, and the direction that detours is opposite; In two inductance coils on the same core limb, branch current flows into from the different name end of inductance two coils respectively.
Three arc control device arc extinguishing schemes in parallel and two arc control device principle of parallel are similar, during three arc control device parallel runnings, the magnetic flux that electric current produces in two coils during normal the operation on equal then each core limb of coupling inductance of each branch current is cancelled out each other, be that magnetic flow in each core limb is zero, coupling inductance presents very little leakage impedance.
During short trouble, by the inductive reaction between the coupling inductance, realize each branch road automatic current equalizing, short circuit current is cut-off in three arc control device parallel connections.
After one or two branch roads disconnected, magnetic flow was non-vanishing in the coupling inductance core limb, and residue branch road inductance presents excitation impedance, and its resistance value is very big, can effectively limit the residue branch current, can successfully cut-off short trouble, and circuit breaker is played a protective role.
Common core adopts the iron circuit that has four core limb structures among Fig. 3; Every branch road comprises the inductance coil of two series connection, and two inductance coils of every branch road are around in respectively on the different core limbs, each branch road inductance coil equal turn numbers; The direction that detours of two series inductance coils is opposite in the same branch road, and the direction that detours of two inductance coils on the same core limb is opposite.
Common core adopts the iron circuit that has four core limb structures among Fig. 4; Every branch road comprises the inductance coil of two series connection, and two inductance coils of every branch road are around in respectively on the different core limbs, each branch road inductance coil equal turn numbers; The direction that detours of four series inductance coils is identical in twos in the same branch road, and the direction that detours of two inductance coils on the same core limb is identical in twos.
The principle of above-mentioned four arc control device parallel runnings and two, three arc control device parallel runnings is similar, repeats no more.
Adopt 3 among Fig. 5 as the coupling inductance that contains two branch roads among Fig. 1.Three coupling inductances constitute the two-stage series connection structure, make loop current be divided into four branch roads.
The first order is divided into two branch roads to system power for two branch road coupling inductances as " mouth " shaped iron core of containing among Fig. 1; Adopt as the parallel circuit breaker among Fig. 1 in above-mentioned each bar branch road the second level.When the effect of each grade coupled inductance is all in parallel with aforementioned two arc control device the effect of coupling inductance is identical, played automatic current equalizing the effect of current limliting, realize four circuit breaker parallel runnings.

Claims (6)

1. parallel circuit breaker, compose in parallel by 2~4 branch roads, every branch road comprises the inductance coil and the switch arc control device of series connection, it is characterized in that: described inductance coil constitutes coupled inductor on common core, the inductance coil equal turn numbers of every branch road, system power flows into the inductance coil of 2~4 branch roads and the arc control device of series connection with it respectively, and the magnetic flux that the inductance coil of each bar branch road and the inductance coil of other branch road produce in each magnetic circuit of iron core is cancelled each other; The arc control device of described every branch road all are jumbo gas arc control device, and 2~4 arc control device in parallel use the arc control device device in parallel by the control of same set of system, perhaps use 2~4 circuit breaker parallel connections that separate.
2. a kind of parallel circuit breaker as claimed in claim 1, it is characterized in that: it is composed in parallel by 2 branch roads, the inductance coil of every branch road is equivalent to no-load voltage ratio and is the former secondary of 1 transformer on public " mouth " shaped iron core, system power flows into two inductance coils by non-same polarity.
3. a kind of parallel circuit breaker as claimed in claim 1 is characterized in that: it is composed in parallel by 3 branch roads, and common core adopts the iron core that has 3 core limb structures; Every branch road comprises the inductance coil of two series connection, each inductance coil equal turn numbers, and two inductance coils of every branch road are around in respectively on the different core limbs, and the direction that detours is opposite; In two inductance coils on the same core limb, branch current flows into from the non-same polarity of inductance two coils respectively.
4. a kind of parallel circuit breaker as claimed in claim 1 is characterized in that: it is composed in parallel by 4 branch roads, and common core adopts the iron core that has 4 core limb structures; Every branch road comprises the inductance coil of two series connection, and two inductance coils of every branch road are around in respectively on the different core limbs, each branch road inductance coil equal turn numbers; The direction that detours of two series inductance coils is opposite in the same branch road, and the direction that detours of two inductance coils on the same core limb is opposite, and when each branch current equated, the resultant flux that two inductance coils on each core limb produce was zero.
5. a kind of parallel circuit breaker as claimed in claim 1 is characterized in that: it is composed in parallel by 4 branch roads, and common core adopts the iron core that has 4 core limb structures; Every branch road comprises the inductance coil of 4 series connection, and 4 inductance coils of every branch road are around in respectively on the different core limbs, each branch road inductance coil equal turn numbers; In the same branch road direction that detours of 4 series inductance coils be two just around to coil and two back-rolls to coil, and the direction that detours of 4 inductance coils on the same core limb makes when each branch current equates that the resultant flux that four inductance coils on each core limb produce is zero.
6. a kind of parallel circuit breaker as claimed in claim 1, it is characterized in that: it is made of two-stage series connection, the first order is composed in parallel by 2 branch roads, the inductance coil of every branch road is on public " mouth " shaped iron core, be equivalent to no-load voltage ratio and be the former secondary of 1 transformer, system power flows into two inductance coils by non-same polarity, is divided into two branch roads and enters the second level; Every the route 2 strip branch roads in the second level compose in parallel, the inductance coil of every strip branch road is on public " mouth " shaped iron core, be equivalent to no-load voltage ratio and be the former secondary of 1 transformer, branch current flows into two inductance coils of sub-branch road by non-same polarity, realizes four arc control device parallel connections.
CNB2007100529477A 2007-08-14 2007-08-14 Parallel circuit breaker CN100536057C (en)

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