CN207603201U - A kind of short-circuit fault current limiter - Google Patents
A kind of short-circuit fault current limiter Download PDFInfo
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- CN207603201U CN207603201U CN201721412262.4U CN201721412262U CN207603201U CN 207603201 U CN207603201 U CN 207603201U CN 201721412262 U CN201721412262 U CN 201721412262U CN 207603201 U CN207603201 U CN 207603201U
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Abstract
The utility model discloses a kind of short-circuit fault current limiters, and including mutual reactor, the first high-speed switch and the second high-speed switch, the first high-speed switch, an arm inductance of mutual reactor and the second high-speed switch are sequentially connected in series；Another arm inductance in parallel of mutual reactor is between the input terminal of the first high-speed switch and the output terminal of the second high-speed switch；When system jam, the first high-speed switch and the second high-speed switch simultaneously switch off, and an arm inductance of mutual reactor is cut off from system, fault current limiting in another arm inductance access power grid of mutual reactor.In the utility model, when short trouble occurs, high-speed switch does not need to cut-off the short circuit current of full capacity, the electric current cut-off and mutual reactor relating to parameters；When mutual reactor two-arm inductance is equal, high-speed switch only needs to cut-off half fault current；Influence of the fault current to system is reduced, increases the reliability that breaker is cut-off.
Description
Technical field
The utility model belongs to current limiter field, is limited more particularly, to a kind of short trouble based on mutual reactor
Flow device.
Background technology
In recent years, as the fast development of electric system, power system capacity constantly increase, short circuit current level sharply increases,
Serious threat is brought to power grid security and stable operation, constrains the development of electric system.In addition, due to material, technique
Etc. many restrictions, the Breaking capacity for directly improving existing monomer breaker is very difficult.Therefore, it is necessary to it takes effective
Measure limits short-circuit current.
Fault current limiter can be limited effectively short in power grid as a kind of technical solution for limiting short-circuit current
Road levels of current.Fault current limiter has the following advantages：On the one hand, the requirement to breaker Breaking capacity can be significantly reduced,
Ensure that breaker can normally cut-off big fault current；On the other hand, various high-voltage electrical equipments in power grid can be mitigated
Dynamic, thermostabilization burden ensures the safety and stablization operation of power grid.Therefore research function admirable, the novel fault limit of economical rationality
Stream device has important practical significance and application value.
Current existing fault current limiter is mainly the following：(1) superconductive current limiter, however the type current limiter cost
Height, volume is big, needs to solve there are many problem in technology, economy and convenience etc..(2) solid-state current limiter：It however should
Scheme cost is higher, is limited by device for high-power power electronic development level.(3) resonant current limiter, however the program
Inductance, capacity cell are introduced, increases the possibility that system generates oscillation and overvoltage, the requirement to capacity cell is high.With
Upper flow scheme limits its application in systems in practice due to many disadvantages.
Utility model content
In view of the drawbacks of the prior art, the utility model provides a kind of short-circuit fault current limiter, and its object is to work as to be
System when breaking down can effective fault current limiting, reduce influence of the fault current to system, increase breaker cut-off it is reliable
Property.
The utility model provides a kind of short-circuit fault current limiter, including：Mutual reactor, the first high-speed switch CB1 and
Second high-speed switch CB2, the first high-speed switch CB1, an arm inductance L1 of the mutual reactor and described second are quickly
Switch CB2 is sequentially connected in series；Another arm inductance L2 of the mutual reactor is connected in parallel on the defeated of the first high-speed switch CB1
Enter between end and the output terminal of the second high-speed switch CB2；When system jam, the first high-speed switch CB1 and
The second high-speed switch CB2 is simultaneously switched off, and an arm inductance L1 of the mutual reactor is cut off from system, the coupling electricity
Fault current limiting in another arm inductance L2 access power grids of anti-device.
Further, it further includes：First equalizing capacitance C1 and the second equalizing capacitance C2；The first equalizing capacitance C1 with
The first high-speed switch CB1 is in parallel, and the second equalizing capacitance C2 is in parallel with the second high-speed switch CB2.
Further, mutual reactor two-arm inductance reverse coupled, the different name end of an arm inductance L1 of mutual reactor
It is connect with the output terminal of the first high-speed switch CB1, the Same Name of Ends of an arm inductance L1 of the mutual reactor and described the
The input terminal connection of two high-speed switch CB2；The Same Name of Ends of another arm inductance L2 of the mutual reactor is quick with described first
Switch the input terminal connection of CB1, different name end and the second high-speed switch CB2 of another arm inductance L2 of the mutual reactor
Output terminal connection；Alternatively, the output terminal of the Same Name of Ends of an arm inductance L1 of mutual reactor and the first high-speed switch CB1
Connection, the different name end of an arm inductance L1 of the mutual reactor is connect with the input terminal of the second high-speed switch CB2；It is described
The different name end of another arm inductance L2 of mutual reactor is connect with the input terminal of the first high-speed switch CB1, the coupling electricity
The logical Same Name of Ends of another arm inductance L2 of anti-device is connect with the output terminal of the second high-speed switch CB2.
Further, the first high-speed switch CB1 is identical with the second high-speed switch CB2 structures, and described first is fast
The electric current that speed switch CB1 needs are cut-off is the fault current that the mutual reactor two-arm inductance is shared, and described first quickly opens
The voltage class for closing CB1 fractures is determined according to the induced voltage under system voltage and current limliting operating mode.
Further, the first high-speed switch CB1 and the second high-speed switch CB2 be meet quick-speed turning on-off with it is synchronous
The breaker of requirement is cut-off, is specifically as follows vacuum circuit breaker.
The utility model has the following advantages：
(1) in normal conditions, mutual reactor externally shows as the leakage reactance of very little, and current limiter is to system substantially without shadow
It rings.
(2) when short trouble occurs, high-speed switch does not need to cut-off the short circuit current of full capacity, and the electric current cut-off is with coupling
Reactor relating to parameters；When mutual reactor two-arm inductance is equal, high-speed switch only needs to cut-off half fault current.
(3) rationally after setting mutual reactor inlet-outlet line mode, basic equipotential between mutual reactor two-arm winding, two-arm
Need the voltage being resistant to very small between winding, it is low to the insulating Design requirement of mutual reactor, applied to voltage levels system
When it is with the obvious advantage.
The coupled one arm windings in series of reactor of (4) two high-speed switches is and at the same time disconnect, therefore each switch disconnects
Recovery voltage in the process reduces, and the requirement to each switch reduces.
Description of the drawings
Fig. 1 is the functional block diagram of short-circuit fault current limiter that the utility model embodiment provides.
Fig. 2 is the circuit diagram of short-circuit fault current limiter that the utility model embodiment provides.
Fig. 3 is the short-circuit fault current limiter that provides of the utility model embodiment mutual reactor two in fault current limiting
Current potential schematic diagram between arm winding.
Fig. 4 is the schematic diagram that the short-circuit fault current limiter that the utility model embodiment provides should be used in the power system.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention is further described in detail.It should be appreciated that specific embodiment described herein is only used to explain
The utility model is not used to limit the utility model.
The utility model proposes the short-circuit fault current limiter based on mutual reactor, in normal conditions to the shadow of system
Ring very little, in system jam can effective fault current limiting, reduce influence of the fault current to system, increase breaker
The reliability cut-off.
The utility model provides a kind of short-circuit fault current limiter, including：Mutual reactor and high-speed switch；High-speed switch
It is connected in series with respectively with one arm inductance both ends of mutual reactor, electric power is accessed after then in parallel with another arm of mutual reactor together
In system line.During system normal operation, mutual reactor externally shows as the leakage inductance of very little, and the influence to system can be ignored
Disregard；During the system failure, two high-speed switches simultaneously switch off, and one arm inductance of mutual reactor is cut off from system, in addition an arm
Fault current limiting in inductance access power grid.
In the utility model embodiment, following scheme can be used in current limiter topology：Mutual reactor, two high-speed switches
CB1, CB2, and switch ends difference parallel equalizing capacitor C1, C2.The reversed close coupling of two-arm of the mutual reactor, wherein one
Arm winding is current-limiting inductance, and another arm winding both ends are connected respectively with two high-speed switches, then in parallel with current-limiting inductance to connect
It connects.
Wherein, when systems are functioning properly, since mutual reactor is reversed close coupling, externally it is rendered as the leakage of very little
Sense, the influence very little to system；When short trouble occurs, high-speed switch, which synchronizes, to be disconnected, mutual reactor current-limiting inductance access electricity
Play metering function in road.
In the utility model embodiment, according to the ginseng of mutual reactor in system short-circuit fault electric current Proper Match scheme
Number mainly includes the parameters such as mutual reactor single armed inductance and the coefficient of coup, and reasonably selects high-speed switch and equalizing capacitance.
In normal conditions, mutual reactor externally shows as the leakage reactance of very little to the utility model, and current limiter is to system base
This is without influence.When short trouble occurs, high-speed switch does not need to cut-off the short circuit current of full capacity, and the electric current cut-off is with coupling electricity
Anti- device relating to parameters；When mutual reactor two-arm inductance is equal, high-speed switch only needs to cut-off half fault current.Pass through conjunction
It manages after mutual reactor inlet-outlet line mode is set, basic equipotential between mutual reactor two-arm winding, is needed between two-arm winding resistance to
The voltage received is very small, low to the requirement of the insulating Design of mutual reactor, and applied to voltage levels system when is with the obvious advantage.Two
A coupled one arm windings in series of reactor of high-speed switch is and at the same time disconnect, therefore the recovery electricity in each switch disconnection process
Pressure drop is low, and the requirement to each switch reduces.
In the utility model embodiment, due to consideration that when system voltage is higher ranked, general high-speed switch will be difficult to
Meet and restore voltage request, therefore high-speed switch can be connected in series by multiple single-break circuit breakers, connect number and voltage etc.
Grade can be determined according to the induced voltage under the voltage class and current limliting operating mode of whole system.
Simultaneously as when considering that system voltage is higher ranked, mutual reactor insulating Design is difficult to meet the requirements, therefore
This current limiter modularized processing by the way of multimode series operation, can effectively can be reduced exhausted to mutual reactor
The recovery voltage request of edge and high-speed switch.
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, it is as follows that the present invention is further described in detail：
Fig. 1 is a kind of functional block diagram of short-circuit fault current limiter；Wherein high-speed switch 1 and high-speed switch 2 and coupling reactance
One arm inductance of device is connected, and is connected on single armed winding both ends respectively, another arm winding of mutual reactor is current-limiting inductance.Coupling reactance
One arm winding of device is connected in series with high-speed switch respectively as current-limiting inductance, another arm winding both ends, before switch motion with current limliting
Inductance shared fault current.System occur short trouble when, high-speed switch simultaneously switches off, one arm winding of mutual reactor from
It is cut off in system, another arm winding is as current-limiting inductance fault current limiting.
There are induced voltages on the winding disconnected due to mutual reactor in limited current state, exhausted between the winding of reactor
Edge has certain influence, improves the design difficulty of mutual reactor；Then the utility model is cut completely by two high-speed switches
Except one arm winding of mutual reactor, after rationally setting winding inlet-outlet line mode, the voltage between two-arm winding is very low, significantly drops
Insulating requirements between low mutual reactor two-arm winding, applied to voltage levels system when, are with the obvious advantage.
Simultaneously because two high-speed switches are connected in series with one arm inductance of mutual reactor, do not need to cut-off full capacity failure
Electric current, and two switches simultaneously switch off, the recovery voltage after shared excision one arm winding of mutual reactor, therefore reduce
Requirement to each switch.
Fig. 2 is a kind of circuit diagram of short-circuit fault current limiter；CB1, CB2 are high-speed switch, and C1, C2 are respectively high-speed switch
The equalizing capacitance of both ends parallel connection, L1, L2 are mutual reactor two-arm inductance, and wherein L2 plays current limliting after high-speed switch disconnection
Effect.The program is made of equalizing capacitance C1, C2 of mutual reactor, high-speed switch CB1, CB2 and switch ends parallel connection, and two
Equalizing capacitance can ensure that two high-speed switch both end voltages are equal, achieve the purpose that while cut-off.Mutual reactor two-arm inductance point
Not Wei L1, L2, wherein L1 both ends connect high-speed switch CB1 respectively and CB2, L2 are current-limiting inductance.
Fig. 3 is the schematic diagram that a kind of short-circuit fault current limiter of the utility model should be used in the power system, and G is infinity
System, T are transformer；If mutual reactor two-arm inductance is equal, according to inlet-outlet line martingale shown in Fig. 3, high-speed switch
CB1, CB2 are equipotential between mutual reactor two-arm winding after disconnecting, and voltage is essentially 0 between winding.
The utility model proposes fault current limiter installation site need to consider the current limitation effect of current limiter and current limliting model
It encloses, is particularly applicable to power plant terminal short-circuit protection, the short-circuit protection that power plant branch bar and factory's height become, power distribution network busbar
Junction etc..
During system normal operation, the electric current for flowing through mutual reactor two-arm is related with two-arm inductance L1, L2 and the coefficient of coup,
When L1 is equal to L2, the electric current for flowing through mutual reactor two-arm is essentially identical.Due to mutual reactor two-arm reverse coupled, and coupling
Collaboration number is very high, more than 0.9 is generally can reach in Practical Project, reactor two-arm is externally rendered as the leakage of very little when through-flow simultaneously
Sense, the single armed inductance less than 5%, the influence to system can be ignored.
When short trouble occurs for system, fault current is by mutual reactor two-arm inductance shared.High-speed switch CB1,
CB2 is connected in series with, therefore do not need to cut-off the fault current of full capacity with one arm inductance of mutual reactor.Equalizing capacitance C1 and C2
It is equal in magnitude, therefore after CB1 and CB2 are simultaneously switched off, the recovery voltages of two switch fractures tolerances are equal.The one of mutual reactor
Arm inductance is fully disconnected from system, another arm inductance fault current limiting.According to system voltage grade and short-circuit current
Size, can be with Proper Match mutual reactor two-arm inductance size and the coefficient of coup.The coefficient of coup of mutual reactor is general
More than 0.9 is taken, the coefficient of coup is bigger, and the leakage inductance of mutual reactor is smaller, smaller to the influence of system under nominal situation.Coupling electricity
The two-arm inductance parameters of anti-device can be determined according to requirement of the system to fault current limiter, wherein playing 2 arm inductance of metering function
L2 must assure that by fault current limitation in the range of requiring, and the size of L1 and L2 determines mutual reactor two-arm inductance
The size of current shared, therefore the connecting-disconnecting function that can combine high-speed switch determines the value of L1, generally takes L1 and L2 equal, i.e. coupling
It closes reactor two-arm inductance and divides equally total system power.
In the utility model embodiment, the selection of high-speed switch CB1 and CB2 need to consider system voltage, failure electricity
The Breaking capacity of stream and switch, considers economic benefit on the basis of reliability.The electric current that cut-offs of high-speed switch needs is
The fault current that mutual reactor two-arm inductance is shared, the voltage class of fracture can be according under system voltage and current limliting operating mode
Induced voltage determines.In order to reduce fault current duration, general use cut-offs fireballing vacuum circuit breaker.
Fig. 3 is the current potential schematic diagram between winding when mutual reactor two-arm inductance is equal.High-speed switch CB1 and CB2 break
After opening, mutual reactor current-limiting inductance can generate an induced voltage on an arm winding of disconnection.Coupling electricity is adjusted according to Fig. 3
After the inlet-outlet line mode of anti-device two-arm winding, equipotential is essentially between two-arm winding, voltage is 0, therefore couple electricity between winding
Insulating requirements between anti-device winding are very low, significantly reduce the design difficulty of mutual reactor.
Fig. 4 is the schematic diagram that short-circuit fault current limiter should be used in the power system.Due to the mutual reactor in current limiter
Insulating requirements are low, and current limiter can be applied on high voltage bus, such as limit the short circuit current of 500kV busbares.When busbar appearance is short
During the failure of road, action by the range of fault current limitation to breaking capacity of breaker, can solve short-circuit fault current limiter rapidly
Busbar short-circuit electric current excessive problem is conducive to the safe and stable operation of electric system.
As it will be easily appreciated by one skilled in the art that the above is only the preferred embodiment of the utility model only, not
To limit the utility model, any modification made within the spirit and principles of the present invention, equivalent replacement and change
Into etc., it should be included within the scope of protection of this utility model.
Claims (4)
1. a kind of short-circuit fault current limiter, which is characterized in that including：Mutual reactor, the first high-speed switch CB1 and second are quick
Switch CB2；
The first high-speed switch CB1, an arm inductance L1 of the mutual reactor and the second high-speed switch CB2 go here and there successively
Connection connection；Another arm inductance L2 of the mutual reactor is connected in parallel on the input terminal and described of the first high-speed switch CB1
Between the output terminal of two high-speed switch CB2；
When system jam, the first high-speed switch CB1 and the second high-speed switch CB2 are simultaneously switched off, the coupling
The arm inductance L1 for closing reactor is cut off from system, and event is limited in another arm inductance L2 access power grids of the mutual reactor
Hinder electric current；
It further includes：First equalizing capacitance C1 and the second equalizing capacitance C2；
The first equalizing capacitance C1 is in parallel with the first high-speed switch CB1, the second equalizing capacitance C2 and described second
High-speed switch CB2 is in parallel.
2. short-circuit fault current limiter as described in claim 1, which is characterized in that the mutual reactor is two reversed height couplings
Reactor is closed, the different name end of an arm inductance L1 of reactor is connect with the output terminal of the first high-speed switch CB1, the coupling
The Same Name of Ends of one arm inductance L1 of reactor is connect with the input terminal of the second high-speed switch CB2；The mutual reactor
The Same Name of Ends of another arm inductance L2 is connect with the input terminal of the first high-speed switch CB1, another arm of the mutual reactor
The different name end of inductance L2 is connect with the output terminal of the second high-speed switch CB2；
Alternatively, the Same Name of Ends of an arm inductance L1 of reactor is connect with the output terminal of the first high-speed switch CB1, the coupling
The different name end of one arm inductance L1 of reactor is connect with the input terminal of the second high-speed switch CB2；The mutual reactor
The different name end of another arm inductance L2 is connect with the input terminal of the first high-speed switch CB1, another arm of the mutual reactor
The Same Name of Ends of inductance L2 is connect with the output terminal of the second high-speed switch CB2.
3. short-circuit fault current limiter as described in claim 1, which is characterized in that the first high-speed switch CB1 and described
Two high-speed switch CB2 structures are identical, and the electric current that the first high-speed switch CB1 needs are cut-off is the mutual reactor two
The fault current that arm inductance is shared, the voltage class of the first high-speed switch CB1 fractures is according to system voltage and current limliting operating mode
Under induced voltage determine.
4. short-circuit fault current limiter as claimed in claim 3, which is characterized in that the first high-speed switch CB1 and described
Two high-speed switch CB2 are the breaker for meeting quick-speed turning on-off and synchronous switching off requirement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721412262.4U CN207603201U (en) | 2017-10-30 | 2017-10-30 | A kind of short-circuit fault current limiter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721412262.4U CN207603201U (en) | 2017-10-30 | 2017-10-30 | A kind of short-circuit fault current limiter |
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| CN207603201U true CN207603201U (en) | 2018-07-10 |
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ID=62757395
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| CN201721412262.4U Active CN207603201U (en) | 2017-10-30 | 2017-10-30 | A kind of short-circuit fault current limiter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107645156A (en) * | 2017-10-30 | 2018-01-30 | 华中科技大学 | A kind of short-circuit fault current limiter |
| CN110867839A (en) * | 2019-12-02 | 2020-03-06 | 广州供电局有限公司 | Overvoltage suppression circuit |
| CN114267559A (en) * | 2021-12-22 | 2022-04-01 | 西安交通大学 | Fast switch type fault current limiting device for ultrahigh voltage system |
-
2017
- 2017-10-30 CN CN201721412262.4U patent/CN207603201U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107645156A (en) * | 2017-10-30 | 2018-01-30 | 华中科技大学 | A kind of short-circuit fault current limiter |
| CN107645156B (en) * | 2017-10-30 | 2024-03-19 | 华中科技大学 | Short-circuit fault current limiter |
| CN110867839A (en) * | 2019-12-02 | 2020-03-06 | 广州供电局有限公司 | Overvoltage suppression circuit |
| CN114267559A (en) * | 2021-12-22 | 2022-04-01 | 西安交通大学 | Fast switch type fault current limiting device for ultrahigh voltage system |
| CN114267559B (en) * | 2021-12-22 | 2023-05-02 | 西安交通大学 | A quick switch formula fault current limiting device for superhigh pressure system |
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