CN106711980A - Modular current limiting device and control method thereof - Google Patents
Modular current limiting device and control method thereof Download PDFInfo
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- CN106711980A CN106711980A CN201710059065.7A CN201710059065A CN106711980A CN 106711980 A CN106711980 A CN 106711980A CN 201710059065 A CN201710059065 A CN 201710059065A CN 106711980 A CN106711980 A CN 106711980A
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- 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
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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- 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
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
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- High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
Abstract
The present invention provides a modular current limiting device and a control method thereof and belongs to the high voltage electrical appliance technical field. With the modular current limiting device and the control method thereof of the invention adopted, the problems of large energy consumption, high cost and large size of a fault current limiter can be solved. The modular current limiting device of the invention comprises a current transformer, a voltage transformer and a current limiting module; the current transformer is connected in series with the current limiting module; a high-speed vacuum switch, a current limiting reactor and a voltage absorber are connected in parallel with one another so as to form the current limiting module; the head end of the voltage transformer is connected into a power grid; the tail end of the voltage transformer is grounded; the voltage transformer is used for measuring system voltage; and the current transformer is used for collecting the current of the power grid. The modular current limiting device and the control method thereof provided by the embodiments of the present invention are applied to the manufacture of a current limiting device.
Description
Technical field
The present invention relates to high voltage electrical apparatus technical field, more particularly to a kind of modular current-limiting apparatus and its control method.
Background technology
With the development of national economy, power system is also being developed rapidly.The increase at full speed of user power utilization amount, appearance it is short
Road electric current also more and more higher, has exceeded the Breaking capacity of breaker, therefore suppresses short circuit current and turn into urgently to be resolved hurrily at present to ask
Topic.Fault current limiter can reduce fault current peak value, mitigate the burden of cut-offfing of breaker, improve the ability to transmit electricity of circuit, be
A kind of solution of more feasible suppression short circuit current.
In the prior art, can practical fault current limiter can be divided mainly into new material type, power electronics type and electricity
Sense current-limiting type；Wherein, new material type fault current limiter mainly has superconduction type fault current limiter and thermosensitive resistance type failure current limit
Device；Superconduction type fault current limiter has detection, conversion and current-limiting function simultaneously, and current limliting speed is fast, is important fault current limiter
Developing direction, but because superconduction type fault current limiter is in external world's work, easily influenceed to occur quenching by external environment to show
As, and in order to protect the work safety of superconduction type fault current limiter, it is necessary to the protective loop of complexity, influences the stabilization of system operation
Property, and it needs supporting refrigeration plant or rectifying installation, and energy consumption is larger.
Power electronics type current limiter is mainly solid-state current limiter；The advantage of solid-state current limiter is fast to the control of short circuit current
It is fast, flexible, but cost is higher at present, and volume is larger, and in high-power electric system, energy consumption is also very big.
Current limit by inductance type current limiter can be divided into series resonance-type current limiter and fixed inductance type current limiter；Series resonance-type is limited
Stream device can limiting short-circuit current rapidly, string benefit is may also operate as during normal operation and is acted on, but reactor power attenuation therein
Larger, operation expense is high；Fixed inductance type current limiter is that the reactor into fixed inductance amount is concatenated in power network, plays increasing
The effect of big loop inductance and limiting short-circuit current, its major defect is bulky, and loss is high.
From the foregoing, in the prior art when short circuit current is suppressed, the fault current limiter energy consumption for using is big, relatively costly
And volume is larger.
The content of the invention
Embodiments of the invention provide a kind of modular current-limiting apparatus and its control method, solve the failure for using and limit
The stream problem that device energy consumption is big, relatively costly and volume is larger.
To reach above-mentioned purpose, embodiments of the invention are adopted the following technical scheme that：
First aspect, the embodiment of the present invention provide a kind of modular current-limiting apparatus, including：Current transformer, voltage are mutual
Sensor, control unit and current limliting module；
Wherein, current transformer and current limliting block coupled in series, current limliting module is by fast vacuum switch, current-limiting reactor and mistake
Voltage absorber is composed in parallel；
The head end of voltage transformer is connected in power network, and the tail end ground connection of voltage transformer, voltage transformer is used to measure
System voltage；Current transformer is used to gather power network current；
Control unit, power network current and predetermined threshold value 1 and the size of predetermined threshold value 2 for judging current transformer collection
Relation；Whether judge the system voltage of voltage transformer collection has voltage landing；Wherein, when the ＞ power network currents of predetermined threshold value 1 >=
Predetermined threshold value 2 and when system voltage has voltage landing, sends separating brake instruction；Wherein pre-set threshold value 1 is opened for fast vacuum
Disconnected electric current threshold value, pre-set threshold value 2 is to judge the threshold value that power network breaks down；
Fast vacuum is switched, and the separating brake instruction for being sent according to control unit switches to gate-dividing state, and fast vacuum is opened
After electric arc in the arc-chutes of pass quickly extinguishes, grid short circuit electric current is transferred to current-limiting reactor and grid short circuit electric current is realized
Suppression；
Surge absorber, the overvoltage produced during for absorbing fast vacuum switch separating brake.
Specifically, fast vacuum switch is vortex repulsive force mechanism fast vacuum switch；Current-limiting reactor is dry-type hollow electricity
Anti- device, surge absorber is arrester.
Specifically, current-limiting apparatus also include insulated platform；Current-limiting apparatus are installed on insulated platform top, and insulated platform is used for
Current-limiting apparatus are insulated.
Specifically, insulated platform is：High-voltage strut insulator.
Specifically, current limliting module can be concatenated with multimode, realize that current limliting depth is controllable.
Specifically, threephase switch is individually control, and each current limliting module of same phase uses same set of control module, each limit
Flow module synchronization action, single current limliting module current limliting does not interfere with the bringing normally into operation of other current limliting modules unsuccessfully.
Second aspect, the embodiment of the present invention provide the modular current-limiting apparatus of any one that first aspect is provided a kind of such as
Control method, including：
Collection power network current；
Measuring system voltage；
Judge power network current with predetermined threshold value 1 and the magnitude relationship of predetermined threshold value 2；Judge whether system voltage has voltage drop
Fall；Wherein, when the ＞ power network currents of predetermined threshold value 1 >=predetermined threshold value 2 and when system voltage has voltage landing, send separating brake and refer to
Order；
Gate-dividing state is switched to according to separating brake instruction, after the electric arc in the arc-chutes of fast vacuum switch quickly extinguishes, will
Grid short circuit electric current is transferred to the suppression of current-limiting reactor and realization to grid short circuit electric current；
Absorb the overvoltage produced during fast vacuum switch separating brake.
Modular current-limiting apparatus provided in an embodiment of the present invention and its control method, when control unit sends separating brake instruction
Afterwards, fast vacuum switch switches to gate-dividing state according to separating brake instruction, and power network current is transferred in current-limiting reactor, realizes
Suppression to power network current；Surge absorber is used to absorb the overvoltage produced during fast vacuum switch separating brake, it is ensured that electricity
Expulsion of arc goes out and fast vacuum switch can reliable separating brake；Modular current-limiting apparatus simple structure provided in an embodiment of the present invention makes
Cost it is lower, small volume is solved in the prior art when short circuit current is suppressed, the fault current limiter energy consumption that uses is big,
The larger problem of relatively costly and volume.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is a kind of structural representation of current-limiting apparatus provided in an embodiment of the present invention；
Fig. 2 is a kind of another structural representation of current-limiting apparatus provided in an embodiment of the present invention；
Fig. 3 is a kind of another structural representation of current-limiting apparatus provided in an embodiment of the present invention；
Fig. 4 is a kind of another structural representation of current-limiting apparatus provided in an embodiment of the present invention；
Fig. 5 is a kind of flow chart of the control method of current-limiting apparatus provided in an embodiment of the present invention.
Reference：
Current-limiting apparatus -10；
Current transformer -1010；
Voltage transformer -1020；
Control unit -1030；
Current limliting module -1040；Fast vacuum switch -1041；Current-limiting reactor -1042；Surge absorber -1043；
Insulated platform -1050.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
The embodiment one, embodiment of the present invention provides a kind of modular current-limiting apparatus 10, includes as shown in Figure 1：Electric current is mutual
Sensor 1010, voltage transformer 1020, control unit 1030 and current limliting module 1040.
Wherein, current transformer 1010 is connected with current limliting module 1040, current limliting module 1040 by fast vacuum switch 1031,
Current-limiting reactor 1032 and surge absorber 1033 are composed in parallel.
The head end of voltage transformer 1020 is connected in power network, the tail end ground connection of voltage transformer 1020, voltage transformer
1020 are used for measuring system voltage；Current transformer 1010 is used to gather power network current.
Needs say that the input of current transformer as shown in Figure 1 1010 connects the input a of current-limiting apparatus 10, electricity
First output end of current transformer 1010 connects the input of control unit 1030, and the second output end of current transformer 1010 connects
Connect voltage transformer 1020 input, fast vacuum switch 1030 input, the input a of current-limiting reactor 1040 and
The input of surge absorber 1050.
The input of voltage transformer 1020 connects the second output end of current transformer 1010, voltage transformer 1020
First output end connects the input of control unit 1030, the first output end connection earth terminal of voltage transformer 1020.
The first input end of fast vacuum switch 1041 connects the second output end of current transformer 1010, and fast vacuum is opened
Close the output end of 1041 the second input connection control unit 1030, the output end connection current limliting dress of fast vacuum switch 1041
Put 10 output end b.
The input of current-limiting reactor 1042 connects the second output end of current transformer 1010, current-limiting reactor 1042
Output end connects the output end b of current-limiting apparatus 10.
The input of surge absorber 1043 connects the second output end of current transformer 1010, surge absorber
1043 output end connects the output end b of current-limiting apparatus 10；The input a and output end b of current-limiting apparatus 10 are series at power network.
Control unit 1030, power network current and predetermined threshold value 1 and default threshold for judging the collection of current transformer 1010
The magnitude relationship of value 2；Whether judge the system voltage of the collection of voltage transformer 1020 has voltage landing；Wherein, when predetermined threshold value 1
＞ power network currents >=predetermined threshold value 2 and when system voltage has voltage landing, sends separating brake instruction；Wherein pre-set threshold value 1 is fast
The electric current threshold value that fast vacuum switch 1041 cut-offs, pre-set threshold value 2 is to judge the threshold value that power network breaks down.
It should be noted that in the application of reality, when there is short circuit current, the electric current of the input of current-limiting apparatus can be gone up
Rise, and the voltage of the output end of current transformer can be reduced；Therefore need while judging the variation relation of electric current and voltage.
Fast vacuum switch 1041, the separating brake instruction for being sent according to control unit 1030 switches to gate-dividing state, soon
After electric arc in the arc-chutes of fast vacuum switch 1041 quickly extinguishes, grid short circuit electric current is transferred to current-limiting reactor 1042 simultaneously
Realize the suppression of grid short circuit electric current.
It should be noted that grid short circuit electric current here is power network produced when being short-circuited, when power network normal work
When, the electric current in power network is power network current.
Surge absorber 1043, the electric current fast vacuum for absorbing the collection of current transformer 1010 switchs 1041 separating brakes
When the overvoltage that produces.
It should be noted that when fast vacuum switch separating brake cut-offs short circuit current in actual application, fast vacuum is opened
After the contact of pass is separated, produce electric arc, arc current zero passage moment, arc extinction that transient recovery electricity is produced on contact between contact
Pressure；Therefore surge absorber is needed to absorb the Restriking overvoltage and damming due to generation of damming produced due to arc reignition
Voltage, it is to avoid cause current-limiting reactor to fail the current limliting of power network current due to overvoltage.
Specifically, fast vacuum switch 1041 is vortex repulsive force mechanism fast vacuum switch；Current-limiting reactor 1042 is dry
Formula air reactor, surge absorber 1043 is arrester.
It should be noted that being vortexed repulsive force mechanism fast vacuum switch in actual application, its voltage class is
40.5kV or 72.5kV.Its initiating moment is less than 1ms, and the total travel time is up to 2ms or so；Due to fast vacuum switch motion
Rapidly, the possibility that switch Restriking overvoltage occurs can to greatest extent be reduced.
Dry-type air-core reactor, rated voltage and test of its reactance value according to quick response unit in actual application
The maximum short circuit current of circuit determines.
As shown in Fig. 2 the current limliting module in modular current-limiting apparatus provided in an embodiment of the present invention can carry out multiple
Series connection is realized controllable to the depth of high current；Although indicating to give a kind of attainable connected mode in Fig. 2, specific application
In the series connection of multiple current limliting modules according to actual conditions, can be carried out；Exemplary, the quick response unit in actual application
It is the vacuum switch of the 40.5kV/40kA of rapid repulsion structure, current-limiting inductance 1 is the reactor of 40.5kV/40kA/6.3mH/2 Ω,
It is capable of achieving voltage class 40.5kV fault current limiters；10 current-limiting reactors are used in series so that current-limiting reactor reaches 20 Europe, branch
Post insulator dielectric grade is 500kV, can be used for the short circuit current limitation of 500kV AC networks；It is directed in actual application
Three-phase installation, modular current-limiting apparatus provided in an embodiment of the present invention can individually control a circuitry phase, i.e., sent out by by this
Three current-limiting apparatus that bright embodiment is provided are serially connected with each circuitry phase of three-phase installation, modular in each circuitry phase
Current-limiting apparatus independent operating；The input failure of any one current-limiting apparatus does not influence the bringing normally into operation of other current-limiting apparatus.
Modular current-limiting apparatus provided in an embodiment of the present invention, after control unit sends separating brake to be instructed, fast vacuum
Switch switches to gate-dividing state according to separating brake instruction, and power network current is transferred in current-limiting reactor, realizes to power network electricity
The suppression of stream；The overvoltage that produces when surge absorber is used to absorb fast vacuum switch separating brake, it is ensured that arc extinction and fast
Fast vacuum switch can reliable separating brake；The cost that modular current-limiting apparatus simple structure provided in an embodiment of the present invention makes is more
Low, small volume is solved in the prior art when short circuit current is suppressed, and the fault current limiter energy consumption for using is big, relatively costly
And the larger problem of volume.
The embodiment two, embodiment of the present invention provides a kind of specific embodiment of modular current-limiting apparatus 10, wherein soon
Fast vacuum switch is vortex repulsive force mechanism fast vacuum switch, and current-limiting reactor is dry-type air-core reactor, surge absorber
It is arrester；Specific attachment structure includes as shown in Figure 3：
The input of current transformer 1010, wherein current transformer connects the input a of current-limiting apparatus 10, Current Mutual Inductance
The first output end connection control unit 1030 of device 1010, the second output end connection vortex repulsive force mechanism of current transformer 1010
The first input end c of fast vacuum switch 1041.
Second output of the input connection current transformer 1010 of voltage transformer 1020, wherein voltage transformer 1020
End, the first output end connection control unit 1030 of voltage transformer 1020, the second output end connection of voltage transformer 1020
Earth terminal.
Control unit 1030, wherein control unit 1030 input connection current transformer 1010 the first output end and
First output end of voltage transformer 1020, the output end connection vortex repulsive force mechanism fast vacuum switch of control unit 1030
Second input of 1041 the second output end i, the 3rd input j, the 4th output end k and switch element 1040.
Vortex repulsive force mechanism fast vacuum switch 1041, wherein be vortexed repulsive force mechanism fast vacuum switch 1041 first is defeated
Enter to hold c to connect the second output end of current transformer 1010, the second input of vortex repulsive force mechanism fast vacuum switch 1041
C, the 3rd input j, the 4th output end k connect the output end of control unit 1030, vortex repulsive force mechanism fast vacuum switch
1041 output end d connects the output end b of current-limiting apparatus 10.
It should be noted that it is by controlling built-in control that repulsive force mechanism fast vacuum switch is vortexed in actual application
Make the closure of switch and cut-off, so as to realize the charging and discharging of divide-shut brake coil, so that the motion of eddy-current disc is driven, it is then real
The opening of existing fast vacuum switch and closing.
The input e connection vortex repulsive force mechanisms of dry-type air-core reactor 1050, wherein dry-type air-core reactor 1050 are fast
The first input end c of fast vacuum switch 1041, the Ausgang connection vortex repulsive force mechanism of dry-type air-core reactor 1050 is quickly true
Air switch closes 1041 output end d.
The input g connection vortex repulsive force mechanism fast vacuums switch 1041 of arrester 1060, wherein arrester 1060
First input end c, the output end d of the output end h connection vortex repulsive force mechanism fast vacuums switch 1041 of arrester 1060.
Specifically, as shown in figure 4, current-limiting apparatus 10 also include insulated platform 1050；It is flat that current-limiting apparatus 10 are installed on insulation
The top of platform 1050, insulated platform 1050 is used to insulate current-limiting apparatus 10.
It should be noted that because the voltage class of different power networks is different, it is therefore desirable to change the insulated electro of insulating unit
Pressure grade, so that the modular current-limiting apparatus that embodiments of the invention are provided can be installed on various different voltage class
Power network in.
Specifically, insulated platform 1050 is：High-voltage strut insulator.
It should be noted that modular current-limiting apparatus provided in an embodiment of the present invention, as shown in Figure 3 in actual application
It is middle the output end b of current-limiting apparatus to be connected to power network main switch A；When power network is short-circuited, the power network electricity of current transformer
Stream can increase suddenly, and the voltage of voltage transformer has voltage landing；Now control unit according to the electric current of current transformer with
The change of the voltage of voltage transformer, judges that power network current transfinites, and sends separating brake and instructs so that vortex repulsive force mechanism fast vacuum
State of the switch in separating brake, while be vortexed repulsive force mechanism fast vacuum switch is transferred to dry-type air-core reactor by power network current
In the branch road of place, so that the suppression by dry-type air-core reactor to power network current；Because vortex repulsive force mechanism fast vacuum is opened
Pass can produce overvoltage in separating brake, it is therefore desirable to which the arrester that will be parallel to vortex repulsive force mechanism fast vacuum switch both sides comes
Absorb the overvoltage produced during vortex repulsive force mechanism fast vacuum switch separating brake, it is ensured that the reliable separating brake of mechanism's fast vacuum switch；
Power network main switch A disconnects simultaneously, it is achieved thereby that the isolation to trouble point.
Modular current-limiting apparatus provided in an embodiment of the present invention, after control unit sends separating brake to be instructed, fast vacuum
Switch switches to gate-dividing state according to separating brake instruction, and power network current is transferred in current-limiting reactor, realizes to power network electricity
The suppression of stream；The overvoltage that produces when surge absorber is used to absorb fast vacuum switch separating brake, it is ensured that arc extinction and fast
Fast vacuum switch can reliable separating brake；The cost that modular current-limiting apparatus simple structure provided in an embodiment of the present invention makes is more
Low, small volume is solved in the prior art when short circuit current is suppressed, and the fault current limiter energy consumption for using is big, relatively costly
And the larger problem of volume.
The embodiment three, embodiment of the present invention provides a kind of such as embodiment one or implements the two modular limits of any one for providing
The control method of device is flowed, including：
S101, collection power network current.
S102, measuring system voltage.
S103, the magnitude relationship for judging power network current and predetermined threshold value 1 and predetermined threshold value 2；Judge whether system voltage has
Voltage landing；Wherein, when the ＞ power network currents of predetermined threshold value 1 >=predetermined threshold value 2 and when system voltage has voltage landing, send point
Lock is instructed.
S104, gate-dividing state is switched to according to separating brake instruction, the electric arc in the arc-chutes of fast vacuum switch quickly extinguishes
Afterwards, grid short circuit electric current is transferred to the suppression of current-limiting reactor and realization to grid short circuit electric current.
The overvoltage produced when S105, absorption fast vacuum switch separating brake.
The control method of modular current-limiting apparatus provided in an embodiment of the present invention, when send separating brake instruct after, according to point
Lock instruction switches to gate-dividing state, and power network current is transferred in current-limiting reactor, realizes the suppression to power network current；Inhale
Receive the overvoltage produced during fast vacuum switch separating brake, it is ensured that arc extinction and the reliable separating brake of fast vacuum switch energy；The present invention
The control method of the modular current-limiting apparatus that embodiment is provided, can effectively control what current-limiting apparatus were caused to grid short circuit
The suppression of short circuit current；Solve in the prior art when short circuit current is suppressed, the fault current limiter energy consumption that uses is big, cost compared with
The high and larger problem of volume.
The above, specific embodiment only of the invention, but protection scope of the present invention is not limited thereto, and it is any
Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, should all contain
Cover within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (7)
1. a kind of modular current-limiting apparatus, it is characterised in that including：Current transformer, voltage transformer, control unit and
Current limliting module；
Wherein, the current transformer and current limliting block coupled in series, current limliting module is by fast vacuum switch, current-limiting reactor and mistake
Voltage absorber is composed in parallel；
The head end of the voltage transformer is connected in power network, the tail end ground connection of the voltage transformer, the voltage transformer
For measuring system voltage；The current transformer is used to gather power network current；
Described control unit, the power network current and predetermined threshold value 1 and default threshold for judging the current transformer collection
The magnitude relationship of value 2；Whether judge the system voltage of the voltage transformer collection has voltage landing；Wherein, when described
The ＞ power network currents of predetermined threshold value 1 >=predetermined threshold value 2 and when the system voltage has voltage landing, sends separating brake instruction；Wherein
Pre-set threshold value 1 is the electric current threshold value that fast vacuum cut-offs, and pre-set threshold value 2 is to judge the threshold value that power network breaks down；
The fast vacuum switch, the separating brake instruction for being sent according to described control unit switches to gate-dividing state, institute
After stating the quick extinguishing of electric arc in the arc-chutes of fast vacuum switch, the grid short circuit electric current is transferred to the current-limiting reactor
Device simultaneously realizes the suppression of grid short circuit electric current；
The surge absorber, the overvoltage produced during for absorbing the fast vacuum switch separating brake.
2. modular current-limiting apparatus according to claim 1, it is characterised in that the fast vacuum switch is denounceed for vortex
Force mechanisms fast vacuum is switched；The current-limiting reactor is dry-type air-core reactor, and the surge absorber is arrester.
3. modular current-limiting apparatus according to claim 1, it is characterised in that the current-limiting apparatus also include that insulation is flat
Platform；The current-limiting apparatus are installed on the insulated platform top, and the insulated platform is used for current-limiting apparatus insulation.
4. modular current-limiting apparatus according to claim 3, it is characterised in that the insulated platform is：High-voltage strut
Insulator.
5. modular current-limiting apparatus according to claim 1, it is characterised in that the current limliting module can be with multimode string
Connect, realize that current limliting depth is controllable.
6. modular current-limiting apparatus according to claim 1, it is characterised in that threephase switch is individually control, and same
Each current limliting module of one phase uses same set of control module, each current limliting module synchronization action, single current limliting module current limliting to fail not
The bringing normally into operation of other current limliting modules can be influenceed.
7. a kind of control method of modular current-limiting apparatus as described in claim any one of 1-6, it is characterised in that bag
Include：
Collection power network current；
Measuring system voltage；
Judge the power network current with predetermined threshold value 1 and the magnitude relationship of predetermined threshold value 2；Judge whether the system voltage has electricity
Drop of pressure；Wherein, when power network current >=predetermined threshold value 2 described in the ＞ of the predetermined threshold value 1 and the system voltage has electricity
During drop of pressure, separating brake instruction is sent；
Gate-dividing state is switched to according to separating brake instruction, the electric arc in the arc-chutes of the fast vacuum switch quickly extinguishes
Afterwards, the grid short circuit electric current is transferred to the suppression of the current-limiting reactor and realization to grid short circuit electric current；
Absorb the overvoltage produced during fast vacuum switch separating brake.
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Cited By (4)
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| CN110729087A (en) * | 2019-10-18 | 2020-01-24 | 大连理工大学 | Voltage-controlled material resistance change curve controllable combination device and implementation method |
| CN111490518A (en) * | 2020-04-20 | 2020-08-04 | 华电智网（天津）科技有限公司 | Hybrid energy-saving high-speed current limiting device |
| CN112366667A (en) * | 2020-11-02 | 2021-02-12 | 西安交通大学 | Integrated fast switch type current limiter and method for matching integrated fast switch type current limiter with circuit breaker |
| CN117240183A (en) * | 2023-08-11 | 2023-12-15 | 安徽合凯电气科技股份有限公司 | Voltage sag prevention device for large motor |
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| CN110729087A (en) * | 2019-10-18 | 2020-01-24 | 大连理工大学 | Voltage-controlled material resistance change curve controllable combination device and implementation method |
| CN110729087B (en) * | 2019-10-18 | 2021-10-15 | 大连理工大学 | Voltage-controlled material resistance change curve controllable combination device and implementation method |
| CN111490518A (en) * | 2020-04-20 | 2020-08-04 | 华电智网（天津）科技有限公司 | Hybrid energy-saving high-speed current limiting device |
| CN112366667A (en) * | 2020-11-02 | 2021-02-12 | 西安交通大学 | Integrated fast switch type current limiter and method for matching integrated fast switch type current limiter with circuit breaker |
| CN112366667B (en) * | 2020-11-02 | 2021-08-10 | 西安交通大学 | Integrated fast switch type current limiter and method for matching integrated fast switch type current limiter with circuit breaker |
| CN117240183A (en) * | 2023-08-11 | 2023-12-15 | 安徽合凯电气科技股份有限公司 | Voltage sag prevention device for large motor |
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