CN110460028A - A kind of device and method limiting short circuit malfunction electric current - Google Patents
A kind of device and method limiting short circuit malfunction electric current Download PDFInfo
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- CN110460028A CN110460028A CN201910695131.9A CN201910695131A CN110460028A CN 110460028 A CN110460028 A CN 110460028A CN 201910695131 A CN201910695131 A CN 201910695131A CN 110460028 A CN110460028 A CN 110460028A
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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
- H02H9/021—Current limitation using saturable reactors
Abstract
The present invention relates to a kind of device and methods for limiting short circuit malfunction electric current, comprising: the first isolation switch, current-limiting reactor, capacitor group, the second isolation switch, bypass breaker, arrester, damping reactor, power electronics solid-state switch and bypass isolation switch；First isolation switch, current-limiting reactor, capacitor group and the second isolation switch are sequentially connected in series；The damping reactor and power electronics firmware switch are connected in series；Series arm, bypass breaker and the arrester of the damping reactor and power electronics firmware switch composition are connected in parallel on capacitor group both ends；First isolation switch, current-limiting reactor, capacitor group and the second isolation switch composition series arm two are terminated with bypass isolation switch；The neutral point side of device access network transformer provided by the invention, can effectively limit short circuit current when short circuit malfunction occurs, guarantee electric power netting safe running.
Description
Technical field
The present invention relates to power system automatic fields, and in particular to it is a kind of limit short circuit malfunction electric current device and
Method.
Background technique
With the fast development of electric system, the older each voltage rating system capacity of power grid the bigger, 500kV, 220kV rack
Structure is increasingly enhanced, and especially in coastal economy developed regions, 500kV power transformation station spacing has narrowed down to 30~60km, power supply capacity
Increase and line impedance reduction cause short circuit malfunction electric current exceeded increasingly severe.Grid short circuit electric current exceeds after 50kA both
The breaking capacity for testing transmission line of electricity breaker also impacts transformer winding structure stabilization.500kV transmission line of electricity at present
The maximum short circuit current breaking capacity of breaker only reaches 63kA, the maximum short circuit current blocking of 220kV transmission line of electricity breaker
Ability is only 50kA, and in the three-phase or one-phase short-circuit current fault current of sub-load center 500kV, 220kV power grid
It has been more than this numerical value.Disjunction is possible to cause breaker quick-fried high-voltage circuitbreaker beyond the short circuit current of its breaking capacity by force
It is fried, seriously affect safe operation of electric network.Current reply means mainly adjust the method for operation by dispatching of power netwoks, open electromagnetism
Looped network makes power grid open loop operation or installs current-limiting reactor additional in transmission line of electricity, but these methods limit the flexible of operation of power networks
Property, safety and reliability, reduce the transmission line capability of transmission line of electricity.Short circuit current is excessive to have become puzzlement power grid security fortune
One of row, factor of limitation power network development.
Although having carried out the research of various limitation grid short circuit current techniques, including superconductor technology, non-superconducting skill at present
Art, magnetic saturation reactor, neutral point series connection low reactance etc., but effect is undesirable, does not obtain large-scale promotion.Fault current
Limiter (Fault Current Limiter, FCL) needs that zero impedance or slight resistance are presented when operating normally, and in electricity
Impedance increases rapidly when short trouble occurs for net, with limiting short-circuit current peak value and reduces short circuit current.FCL device must have
Quickly (< 3-5ms), large capacity, the reliable and lesser feature of land occupation.
In the prior art, the technical research origin of electric system especially supergrid short-circuit current is limited
Long, mainly include following several major class from technology path:
1) current-limiting reactor
I.e. on the transmission line connect current-limiting reactor or transformer neutral point connect small reactor.This is current power grid
The method for the limiting short-circuit current taken extensively has the characteristics that at low cost, high reliablity.But high-voltage and current-limitation reactor can reduce
System stability margin reduces system transmission line capability, and transformer neutral point series connection low reactance can only limit the event of power grid single-phase earthing
The short circuit current of barrier does not have current limitation effect for two-phase or three-phase ground failure.
2) resonant current limiter resonant current limiter is to carry out the one of current limliting by capacitor and the industrial frequency resonance principle of reactance
Kind technical solution, including series resonance-type current limiter and Parallel Resonant current limiter.
Series resonance-type current limiter passes through the characteristic that capacitor and the reactance series resonance under power frequency export zero impedance, in power grid
Quick shunt capacitance when short-circuit, by series reactance limiting short-circuit current.Parallel Resonant current limiter is then that short circuit occurs in power grid
By thyristor-controlled reactor when failure, the power frequency parallel resonance of capacitor and reactance is formed with limiting short-circuit current.Mode of resonance
Current limiter is connected in ultra-high-tension power transmission line, and insulation against ground is more demanding and occupied area is larger, higher cost, and only to place
Transmission line of electricity provides constraints, so using less.
3) magnetic saturation type current limiter
Iron core reactor output reactance under iron core depth saturation state is smaller and exits the increase of saturation state reactance value, by
Control system detects the output reactance of control iron core exciting current change iron core reactor after grid failure state, can limit short
Road fault current.The program is larger since iron core reactor is lost, and the time that iron core enters and exit saturation state is fast not enough
Speed, and it is applied to supergrid higher cost, it is not widely applied in power grid.
4) superconduction type current limiter
Based superconductive material property, makes route resistance is close to zero under superconducting critical temperature and short circuit current is big in failure
It quickly quenches to form high resistance with limiting short-circuit current in overcritical current device.The current heavy dependence superconductor of the program is special
Property, there are the report of engineer application but at home also non-mature in foreign countries.
5) high voltage current limiter
It is limited by fuse when there is short-circuit current or interrupting short circuit is also a kind of limiting short-circuit current
Method, such as high arc voltage current limiter, but can only disposably cut-off short circuit current cannot achieve reclosing, has certain
Limitation.
No matter above any technology path, all have the defects that certain.In terms of engineering practice, go here and there humorous type current limiter and
Magnetic saturation type current limiter had engineer application in 500kV power grid, but since cost, land occupation, loss and reliability etc. are many-sided former
Cause does not all obtain large-scale promotion in power grid.
Summary of the invention
In view of the deficiencies of the prior art, the object of the present invention is to provide kind of the device of limitation short circuit malfunction electric current and a sides
Method, the neutral point side of device access network transformer provided by the invention, can effectively limit when short circuit malfunction occurs
Short circuit current guarantees electric power netting safe running.
The purpose of the present invention is adopt the following technical solutions realization:
A kind of device limiting short circuit malfunction electric current, it is improved in that described device includes: the first isolation knife
Lock, current-limiting reactor, capacitor group, the second isolation switch, bypass breaker, arrester, damping reactor, power electronics solid-state
Switch and bypass isolation switch；
First isolation switch, current-limiting reactor, capacitor group and the second isolation switch are sequentially connected in series；
The damping reactor and power electronics firmware switch are connected in series；
The series arm of the damping reactor and power electronics firmware switch composition, bypass breaker and arrester are equal
It is connected in parallel on capacitor group both ends；
First isolation switch, current-limiting reactor, capacitor group and the second isolation switch composition series arm two terminate
There is bypass isolation switch.
Preferably, the type of the arrester is metal oxide arrester.
Preferably, the type of the current-limiting reactor and damping reactor is oil immersed type iron core reactor, the series connection
The impedance ranges of reactor are 10~20 ohm, and the impedance ranges of the damping reactor are 2~5 ohm.
Preferably, the capacitance range of the capacitor group is 318uf~159uf.
Preferably, the power electronics solid-state switch includes: the brilliant lock of mean on state current 5000A, the 90kA that instantaneously shoves
The IGBT valve of pipe valve or mean on state current 5000A, the 90kA that instantaneously shoves.
Further, the thyristor valve is made of the connection of multiple Thyristors in series valves；
The Thyristors in series valve is in parallel with the thyristor of two reverse parallel connections by the series arm that resistance and capacitor form
Composition.
Further, the IGBT valve is made of the connection of multiple IGBT series valves；
The IGBT series valve is by first diode, the second diode, third diode, the 4th diode and IGBT structure
At；
The cathode of the first diode is connect with the cathode of the second diode, the anode and the 4th of second diode
The anode of diode connects, and the cathode of the 4th diode is connect with the cathode of third diode, the third diode
Anode and the anode of first diode connect；
Tie point connection between the collector and first diode and the second diode of the IGBT；
Tie point connection between the emitter and third diode and the 4th diode of the IGBT.
Preferably, a described device is respectively equipped between each phase transformer neutral point of electric system and grounding point.
Preferably, a described device is equipped between each phase transformer neutral point of electric system and grounding point.
Further, the first isolation switch in described device, current-limiting reactor, capacitor group and the second isolation switch group
At series arm and bypass isolation switch between a tie point connect with each phase transformer neutral point of power grid, described device
In the first isolation switch, current-limiting reactor, capacitor group and the second isolation switch composition series arm and bypass isolation knife
Another tie point between lock is connect with grounding point.
A kind of method of the limitation short circuit malfunction electric current of the device of the limitation short circuit malfunction electric current, changes
It is into place, which comprises
The bypass isolation switch is disconnected, when single-phase/three-phase occurs for power grid over the ground or when phase fault, passes through triggering
Route triggers the power electronics solid-state switch conducting, is closed the bypass breaker；
After the bypass breaker closure, stop triggering the power electronics solid-state switch；
After power system restoration operates normally, the bypass breaker is disconnected.
Compared with the immediate prior art, the invention has the benefit that
The feature that apparatus structure provided by the invention is simple, working voltage is low, at low cost and small occupied area, is convenient for
The plant retrofit that 500kV, 220kV substation change.Its design advantage is as follows:
1) present invention bypasses the capacitor group in series resonant circuit by power electronics solid-state switch, and the response time is fast,
Only 2~3ms can quickly inhibit the short fault current of power grid.
2) present invention is by device serial connection when the neutral point of 500kV, 220kV transformer first winding, power grid normal operation
Since impedance is zero, there is no any influence to transformer station high-voltage side bus, and since transformer neutral point is grounded, the voltage class of device
Low, insulation against ground is of less demanding, and cost is relatively low, and occupied area is smaller, convenient for the existing transformer of 500kV and 220kV substation
Transformation.
3) present invention by device serial connection in the neutral point of 500kV, 220kV transformer first winding, to high voltage side of transformer
The short-circuit current of all 500kV, 220kV transmission lines of electricity of access is all inhibited, that is, passes through installation and transformer
The device of identical quantity can have the short-circuit current of 500kV, 220kV transmission line of electricity of power grid in an area
Effect inhibits, and without a set of with installing on every transmission line of electricity, greatly reduce cost, improves service efficiency.
4) present invention can inhibit power grid one-phase short-circuit current fault current, also can inhibit three relative ground circuit failure electricity
Stream, also can inhibit two-phase short-circuit current, all has preferable rejection characteristic to the electric current of the various short troubles of power grid.
5) present invention flows inhibition neutral point the earth due to capacitor/reactor of having connected in transformer first winding
The DC component for entering transformer winding has positive effect, and the bias that can eliminate the direct current winding of 500kV, 220kV transformer is existing
As.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of device for limiting short circuit malfunction electric current provided by the invention；
Fig. 2 is the structural schematic diagram for the thyristor valve that multiple Thyristors in series valves are composed in series in the embodiment of the present invention；
Fig. 3 is the structural schematic diagram for the IGBT valve that multiple IGBT series valves are composed in series in the embodiment of the present invention；
Fig. 4 is to be respectively equipped with one between each phase transformer neutral point of electric system and grounding point in the embodiment of the present invention
The structural schematic diagram of described device of the invention；
Fig. 5 is to be equipped with this hair in the embodiment of the present invention between each phase transformer neutral point of electric system and grounding point
The structural schematic diagram of bright described device；
Wherein, 1 it is bypass breaker, 2 be isolation switch (band earthing knife-switch), 3 be current-limiting reactor, 4 be capacitor group, 5 is
MOV, 6 be damping reactor, 7 be thyristor valve, 8 be bypass isolation switch, 9 be control system, 10 be triggering route, 11 be electricity
Current transformer.
Specific embodiment
Specific embodiments of the present invention will be described in further detail with reference to the accompanying drawing.
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
All other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
The present invention provides a kind of devices for limiting short circuit malfunction electric current, by capacitor/reactor of series resonance
And power electronics solid-state switch is installed on the neutral point side of network transformer ground connection, triggers at once when short trouble occurs for power grid
The conducting of power electronics solid-state switch, the quick insertion reactor in transformer winding circuit effectively inhibit the quick of short circuit current
Rise, action response time can reach 2-3ms.When transformer is operated normally since capacitor/reactor is in 50Hz work
Be in series resonance state on frequency, exchange reactance with exchange capacitive reactance and cancel out each other completely, total resistance is substantially zeroed, and transformer connects
Ground resistance impedance value is constant, will not raise the voltage of transformer neutral point, will not influence the normal operation of transformer；
Specifically, a kind of device for limiting short circuit malfunction electric current provided by the invention includes: as shown in Figure 1
First isolation switch, current-limiting reactor, capacitor group, the second isolation switch, bypass breaker, arrester, damping
Reactor, power electronics solid-state switch and bypass isolation switch；
First isolation switch, current-limiting reactor, capacitor group and the second isolation switch are sequentially connected in series；
The damping reactor and power electronics firmware switch are connected in series；
The series arm of the damping reactor and power electronics firmware switch composition, bypass breaker and arrester are equal
It is connected in parallel on capacitor group both ends；
First isolation switch, current-limiting reactor, capacitor group and the second isolation switch composition series arm two terminate
There is bypass isolation switch.
Wherein, puncture capacitor group, In to prevent capacitor both ends from power-frequency overvoltage occur in short circuit malfunction moment
Capacitor both ends can install metal oxide arrester (MOV) limitation transient overvoltage additional.
The type of apparatus of the present invention current-limiting reactor and damping reactor is oil immersed type iron core reactor, the series electrical
The impedance ranges of anti-device are 10~20 ohm, and the impedance ranges of the damping reactor are 2~5 ohm.
The type of the current-limiting reactor and damping reactor is oil immersed type iron core reactor, the current-limiting reactor
Impedance ranges are 10~20 ohm, and the impedance ranges of the damping reactor are 2~5 ohm.
The capacitance range of the capacitor group is 318uf~159uf, can be made up of in series and parallel more power capacitors,
To prevent capacitor faults, capacitor group uses bridge connection, is carried out by the out-of-balance current of capacitor group to capacitor group
Detection and protection.
The power electronics solid-state switch uses the thyristor valve or flat of mean on state current 5000A, the 90kA that instantaneously shoves
The IGBT valve of equal on state current 5000A, the 90kA that instantaneously shoves.
As shown in Fig. 2, the thyristor valve is made of the connection of multiple Thyristors in series valves；
The Thyristors in series valve is in parallel with the thyristor of two reverse parallel connections by the series arm that resistance and capacitor form
Composition.
Alternatively, as shown in figure 3, the IGBT valve is made of the connection of multiple IGBT series valves；
The IGBT series valve is by first diode, the second diode, third diode, the 4th diode and IGBT structure
At；
The cathode of the first diode is connect with the cathode of the second diode, the anode and the 4th of second diode
The anode of diode connects, and the cathode of the 4th diode is connect with the cathode of third diode, the third diode
Anode and the anode of first diode connect；
Tie point connection between the collector and first diode and the second diode of the IGBT；
Tie point connection between the emitter and third diode and the 4th diode of the IGBT.
One is respectively equipped between each phase transformer neutral point of electric system and grounding point in embodiment provided by the invention
A described device of the invention, it is low with first winding that device is series at the every phase neutral point of electric system 500kV or 220kV transformer
Between pressure side, every phase connect it is a set of, amount to 3 sets, the device other end realize three-phase neutral point connection and be grounded, such as attached drawing 4
It is shown, wherein power electronics solid-state switch is by taking thyristor as an example.When power grid 500kV, 220kV transmission line of electricity occurs three relatively
When short circuit, one-phase short-circuit current or phase fault, control system detects that transmission line of electricity short circuit current is uprushed, in 2~3ms
Internal trigger power electronics solid-state switch greatly reduces short circuit current so that transformer neutral point earth impedance moment increases, when event
After barrier route is cut off or disappeared by route high-voltage circuitbreaker, power electronics solid-state switch stops triggering, and the fast quick-recovery of device is external
The state that output impedance is zero.
A sheet is equipped in embodiment provided by the invention between each phase transformer neutral point of electric system and grounding point
The described device of invention, device are series between electric system 500kV or 220kV Three-Phase Transformer neutral point and grounding point, and three
It mutually only connects 1 set, device one terminates the transformer neutral point other end and is directly grounded, as shown in Fig. 5, wherein power electronics is solid
State is switched by taking thyristor as an example.When one-phase short-circuit current failure occurs for power grid 500kV, 220kV transmission line of electricity, control system inspection
It measures transmission line of electricity short circuit current to uprush, in 2~3ms internal trigger power electronics solid-state switch, so that transformer neutral point is over the ground
Impedance moment increases, and can greatly reduce single-phase short circuit current, after faulty line is cut off or is disappeared by line-breaker, electric power electricity
Sub- solid-state switch stops triggering, the state that the external output impedance of the fast quick-recovery of device is zero.
In above two kinds of modes of connection, apparatus of the present invention are all mounted to the neutral point of 500kV or 220kV transformer,
Since the external impedance of device is zero when power grid operates normally, so that device both end voltage is reduced to zero.Due to 550kV, 220kV transformation
Device neutral-point solid ground, device above earth potential are also zero.Only when short trouble occurs for power grid, due to capacitor both ends quilt
The conducting of power electronics solid-state switch is shorted, and reactor will bear higher instantaneous power-frequency overvoltage, but not more than 500kV or
The power-frequency overvoltage tolerance value of 220kV transformer neutral point casing.Apparatus of the present invention insulation against ground when power grid operates normally is wanted
Ask lower, therefore land occupation and cost relatively access ultra-high-tension power transmission line substantially reduce.
Further, the first isolation switch in described device, current-limiting reactor, capacitor group and the second isolation switch group
At series arm and bypass isolation switch between a tie point connect with each phase transformer neutral point of power grid, described device
In the first isolation switch, current-limiting reactor, capacitor group and the second isolation switch composition series arm and bypass isolation knife
Another tie point between lock is connect with grounding point.
The present invention also provides a kind of limitation grid short circuits of device based on the limitation short circuit malfunction electric current
The method of fault current, which comprises
The bypass isolation switch is disconnected, when single-phase/three-phase occurs for power grid over the ground or when phase fault, passes through triggering
Route triggers the power electronics solid-state switch conducting, is closed the bypass breaker；
After the bypass breaker closure, stop triggering the power electronics solid-state switch；
After power system restoration operates normally, the bypass breaker is disconnected.
Based on above scheme, in application scenarios as shown in Figure 1, specific implementation process is as follows:
(1) device puts into process: before device investment, bypass isolation switch 8 is in closed state, and bypass breaker 1 is in
Opening state.Isolation switch 2 is opened by closed state first over the ground for device two sides, and isolation switch 2 is then closed by opening state.
After all devices are ready, the remote control bypass isolation switch 8 of control system 9 is opened by closed state, and device puts into operation.
(2) device operational process: after device puts into operation, external output impedance is zero, does not influence operation of power networks, control system
System 9 can real-time monitoring thyristor valve 7 working condition.When single-phase/three-phase occurs for power grid over the ground or when phase fault, power grid
Electric current sharply increases, and 4 both end voltage of capacitor group rises, and the MOV5 for being connected in parallel on its both ends is acted immediately, inhibits the quick of voltage
Rise, after control system 9 detects that electric network fault occurs in 2~3ms, runs through triggering route 10 and trigger thyristor valve 7
Conducting is simultaneously emitted by the instruction of closure bypass breaker 1,100ms so that capacitor group 4 is quickly bypassed through damping reactor 6
Bypass breaker 1 is closed afterwards, and control system 9 stops triggering thyristor valve 7, and reactor 3 is inserted into faulty grids, short trouble
Electric current is successfully limited.Protective relaying device will cut off faulty line after short trouble occurs for power grid, and power grid restores normal immediately
Operation issues the instruction for opening bypass breaker 1, with side after present apparatus control system 9 detects that power system restoration operates normally
Circuit breaker 1 is in disjunction state, and device puts into operation again.
(3) device exits process: need to be out of service when turnaround of unit, control system 9 issues closure bypass isolation knife first
Lock 8 instructs, and bypasses isolation switch 8 by disjunction state and is transferred to closed state, then the isolation switch 2 at disjunction present apparatus both ends, is closed
Isolation switch 2 over the ground, device are out of service.
Technical solution provided by the invention is with apparatus structure is simple, working voltage is low, at low cost and occupied area is small
Feature, the plant retrofit changed convenient for 500kV, 220kV substation.Its design advantage is as follows:
1) present invention bypasses the capacitor group in series resonant circuit by power electronics solid-state switch, and the response time is fast,
Only 2~3ms can quickly inhibit the short fault current of power grid.
2) present invention is by device serial connection when the neutral point of 500kV, 220kV transformer first winding, power grid normal operation
Since impedance is zero, there is no any influence to transformer station high-voltage side bus, and since transformer neutral point is grounded, the voltage class of device
Low, insulation against ground is of less demanding, and cost is relatively low, and occupied area is smaller, convenient for the existing transformer of 500kV and 220kV substation
Transformation.
3) present invention by device serial connection in the neutral point of 500kV, 220kV transformer first winding, to high voltage side of transformer
The short-circuit current of all 500kV, 220kV transmission lines of electricity of access is all inhibited, that is, passes through installation and transformer
The device of identical quantity can have the short-circuit current of 500kV, 220kV transmission line of electricity of power grid in an area
Effect inhibits, and without a set of with installing on every transmission line of electricity, greatly reduce cost, improves service efficiency.
4) present invention can inhibit power grid one-phase short-circuit current fault current, also can inhibit three relative ground circuit failure electricity
Stream, also can inhibit two-phase short-circuit current, all has preferable rejection characteristic to the electric current of the various short troubles of power grid.
5) present invention flows inhibition neutral point the earth due to capacitor/reactor of having connected in transformer first winding
The DC component for entering transformer winding has positive effect, and the bias that can eliminate the direct current winding of 500kV, 220kV transformer is existing
As.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Finally it should be noted that: the above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, to the greatest extent
Invention is explained in detail referring to above-described embodiment for pipe, it should be understood by those ordinary skilled in the art that: still
It can be with modifications or equivalent substitutions are made to specific embodiments of the invention, and without departing from any of spirit and scope of the invention
Modification or equivalent replacement, should all cover within the scope of the claims of the present invention.
Claims (11)
1. a kind of device for limiting short circuit malfunction electric current, which is characterized in that described device includes: the first isolation switch, string
Join reactor, capacitor group, the second isolation switch, bypass breaker, arrester, damping reactor, power electronics solid-state switch
With bypass isolation switch；
First isolation switch, current-limiting reactor, capacitor group and the second isolation switch are sequentially connected in series；
The damping reactor and power electronics firmware switch are connected in series；
The series arm of the damping reactor and power electronics firmware switch composition, bypass breaker and arrester are in parallel
At capacitor group both ends；
First isolation switch, current-limiting reactor, capacitor group and the second isolation switch composition series arm two are terminated with side
Road isolation switch.
2. device as described in claim 1, which is characterized in that the type of the arrester is metal oxide arrester.
3. device as described in claim 1, which is characterized in that the type of the current-limiting reactor and damping reactor is oil
Immersion iron core reactor, the impedance ranges of the current-limiting reactor are 10~20 ohm, the impedance ranges of the damping reactor
It is 2~5 ohm.
4. device as described in claim 1, which is characterized in that the capacitance range of the capacitor group is 318uf~159uf.
5. device as described in claim 1, which is characterized in that the power electronics solid-state switch includes: mean on state current
The IGBT valve of 5000A, the thyristor valve for the 90kA that instantaneously shoves or mean on state current 5000A, the 90kA that instantaneously shoves.
6. device as claimed in claim 5, which is characterized in that the thyristor valve is by multiple Thyristors in series valve connection groups
At；
The thyristor of series arm and two reverse parallel connections that the Thyristors in series valve is made of resistance and capacitor composes in parallel.
7. device as claimed in claim 5, which is characterized in that the IGBT valve is made of the connection of multiple IGBT series valves；
The IGBT series valve is made of first diode, the second diode, third diode, the 4th diode and IGBT；
The cathode of the first diode is connect with the cathode of the second diode, the anode of second diode and the four or two pole
The anode of pipe connects, and the cathode of the 4th diode is connect with the cathode of third diode, the anode of the third diode
It is connect with the anode of first diode；
Tie point connection between the collector and first diode and the second diode of the IGBT；
Tie point connection between the emitter and third diode and the 4th diode of the IGBT.
8. device as described in claim 1, which is characterized in that divide between each phase transformer neutral point of electric system and grounding point
It She You not a described device.
9. device as described in claim 1, which is characterized in that set between each phase transformer neutral point of electric system and grounding point
There is a described device.
10. device as claimed in claim 8 or 9, which is characterized in that the first isolation switch, series reactance in described device
A tie point and power grid between device, the series arm of capacitor group and the second isolation switch composition and bypass isolation switch is each
Phase transformer neutral point connects, the first isolation switch, current-limiting reactor, capacitor group and the second isolation switch in described device
Another tie point between the series arm and bypass isolation switch of composition is connect with grounding point.
11. a kind of limitation power grid of the device based on the described in any item limitation short circuit malfunction electric currents of claim 1-9 is short
The method of road fault current, which is characterized in that the described method includes:
The bypass isolation switch is disconnected, when single-phase/three-phase occurs for power grid over the ground or when phase fault, passes through triggering route
The power electronics solid-state switch conducting is triggered, the bypass breaker is closed；
After the bypass breaker closure, stop triggering the power electronics solid-state switch；
After power system restoration operates normally, the bypass breaker is disconnected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910695131.9A CN110460028A (en) | 2019-07-30 | 2019-07-30 | A kind of device and method limiting short circuit malfunction electric current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910695131.9A CN110460028A (en) | 2019-07-30 | 2019-07-30 | A kind of device and method limiting short circuit malfunction electric current |
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| Publication Number | Publication Date |
|---|---|
| CN110460028A true CN110460028A (en) | 2019-11-15 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111863483A (en) * | 2020-07-08 | 2020-10-30 | 上海京硅智能技术有限公司 | Hybrid switch control mechanism |
| CN112018897A (en) * | 2020-09-10 | 2020-12-01 | 广东电网有限责任公司电力科学研究院 | Method and device for monitoring state of superconducting alternating current limiter based on reclosing |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111863483A (en) * | 2020-07-08 | 2020-10-30 | 上海京硅智能技术有限公司 | Hybrid switch control mechanism |
| CN112018897A (en) * | 2020-09-10 | 2020-12-01 | 广东电网有限责任公司电力科学研究院 | Method and device for monitoring state of superconducting alternating current limiter based on reclosing |
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