CN106711924A - Device for suppressing capacitive load closing inrush current and breaking overvoltage and method thereof - Google Patents
Device for suppressing capacitive load closing inrush current and breaking overvoltage and method thereof Download PDFInfo
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- CN106711924A CN106711924A CN201710088196.8A CN201710088196A CN106711924A CN 106711924 A CN106711924 A CN 106711924A CN 201710088196 A CN201710088196 A CN 201710088196A CN 106711924 A CN106711924 A CN 106711924A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/025—Disconnection after limiting, e.g. when limiting is not sufficient or for facilitating disconnection
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Abstract
The invention provides a device for suppressing capacitive load closing inrush current and breaking overvoltage and a method thereof. The device comprises a circuit breaker used for a capacitive load and a control module. The circuit breaker used for the capacitive load comprises a first auxiliary switch, a second auxiliary switch, a main switch, a first resistor and a second resistor. The method comprises the steps that the control module controls the first auxiliary switch to be closed firstly in closing, and the first resistor is connected in series in a loop; then the second auxiliary switch is controlled to be closed, and the parallel resistance of the first resistor and the second resistor is connected in series in the circuit; and finally the main switch is controlled to be closed, a current limiting resistor is shorted and then the first auxiliary switch and the second auxiliary switch are controlled to be separated so that closing inrush current of the circuit breaker can be effectively limited. The control module controls the second auxiliary switch to be closed firstly in separating; then the main switch is controlled to be separated so that the second resistor is enabled to be connected in series in the circuit; and finally the second auxiliary switch is controlled to be separated, and the circuit is open so that breaking overvoltage of the circuit breaker can be effectively limited. The problems of closing inrush current when the capacitive load is switched on and breaking overvoltage when the capacitive load is disconnected can be simultaneously solved and effectively suppressed.
Description
Technical field
The present invention relates to medium-voltage distribution equipment technical field, more particularly to a kind of suppression capacitive load is closed shoves and cut-offs
The device and method of overvoltage.
Background technology
The subject matter of Circuit Breaker Switching capacitive load is：Close and shove and cut-off overvoltage, can both be produced when closing a floodgate
Close and shove, can be produced in separating brake and cut-off overvoltage.
Overvoltage is shoved and cut-offs as shown in figure 1, installing parallel resistance additional on-board the circuit breaker and can limit to close, but due to capacitive
Suppress to close the requirement difference for shoving or cut-offfing overvoltage to parallel resistance resistance in circuit, conventional parallel resistance single can only be delayed
Solution is closed shoves or cut-offs overvoltage problem, it is impossible to suppress to close simultaneously using a set of parallel resistance to shove and cut-off overvoltage.
Accordingly, it would be desirable to the parallel resistive circuit structure of capacitive load breaker is improved, to meet using a set of
Parallel resistance suppresses to close the purpose for shoving and cut-offfing overvoltage simultaneously.
The content of the invention
For the problem for overcoming above-mentioned prior art to exist, closed it is an object of the invention to one kind suppression capacitive load and gushed
The device and method of overvoltage is flowed and cut-offs, closing when can simultaneously solve effectively to suppress input capacitive load is shoved and cut off
Overvoltage problem is cut-off during capacitive load.
In order to achieve the above object, the present invention is adopted the following technical scheme that：
A kind of suppression capacitive load closes the device for shoving and cut-offfing overvoltage, including capacitive load with breaker 100 with
And the control module 200 that control capacitive load is closed a floodgate and closed with the breaker in middle of breaker 100, the capacitive load breaker
100 include the first auxiliary switch K1, the second auxiliary switch K2, main switch K3, first resistor R1 and second resistance R2；First auxiliary
Switch K1 is in parallel with second resistance R2 after being connected with first resistor R1, then after being connected with the second auxiliary switch K2 with main switch K3 simultaneously
Connection, wherein：The parallel resistance formed after first resistor R1 and second resistance R2 parallel connections is current-limiting resistance, and second resistance R2 is pressure limiting
Resistance.
The current-limiting resistance is hundred Europe level resistance, and the pressure limiting resistance is kilo-ohm level resistance.
The resistance of the first resistor R1 is 130 ohm, and the resistance of second resistance R2 is 1835 ohm.
Described device suppresses capacitive load and closes the method for shoving and cut-offfing overvoltage, it is adaptable to intermediate distribution system
Capacitive load, described device is series in the capacitive load of intermediate distribution system；When the capacitive load breaker 100 closes a floodgate
When, control module 200 controls the first auxiliary switch K1 first to close, and first resistor R1 is sealed in into loop；After predetermined amount of time, control
Module 200 controls the second auxiliary switch K2 to close again, and the parallel resistance by first resistor R1 and second resistance R2 is current-limiting resistance
Seal in circuit；After predetermined amount of time, the control main switch K3 closures of last control module 200, by current-limiting resistance short circuit, are then controlled
First auxiliary switch K1 and the second auxiliary switch K2 separating brakes, effectively closing for limiting circuit breaker can shove；When the capacitive is negative
Carry during with 100 separating brake of breaker, control module 200 controls the second auxiliary switch K2 first to close a floodgate；After predetermined amount of time, control module
200 control main switch K3 separating brakes again, the i.e. pressure limiting resistance of second resistance R2 is sealed in circuit；After predetermined amount of time, mould is finally controlled
Block 200 controls the second auxiliary switch K2 separating brakes, cut-off circuit, effectively can cut-off overvoltage, separating brake by limiting circuit breaker
When, the actuation time interval of setting is more than supply voltage half period, to ensure the sequencing for actually cut-offfing.
The value of the predetermined amount of time of the combined floodgate is 10ms, and the value of the predetermined amount of time of separating brake is 20ms.
The present invention is compared to the prior art compared with possessing following advantage：
The present invention provide apparatus and method from close shove, cut-off overvoltage and parallel resistance energy consumption three in terms of carry out
The resistance selection of parallel resistance in capacitive load switching circuit breaker, it is possible to achieve shove and cut-off two problems of overvoltage to closing
Suppression, meet the requirement of Circuit Breaker Switching capacitive load in intermediate distribution system.Due to suppressing to close in capacitive circuit to shove
Or requirement difference of the overvoltage to parallel resistance resistance is cut-off, so conventional parallel resistance single can only be alleviated to close and being shoved or being opened
Disconnected overvoltage problem, it is impossible to suppress to close simultaneously using a set of parallel resistance to shove and cut-off overvoltage.Present invention determine that master
The sequence of movement of auxiliary switch and the suitable resistance of parallel resistance, both can guarantee that to closing the suppression shoved, and can ensure right again
The suppression of overvoltage is cut-off, while the requirement of equipment tolerance can also be met.
Brief description of the drawings
Fig. 1 is that the conventional capacitive load that suppresses closes the schematic device for shoving or cut-offfing overvoltage.
Fig. 2 is that present invention suppression capacitive load closes the device embodiment schematic diagram for shoving and cut-offfing overvoltage.
Fig. 3 is that the present invention suppresses switch switching order figure (hundred Europe level R1 and kilo-ohm level that capacitive load closes the method for shoving
The parallel resistance of R2 constitutes current-limiting resistance), wherein, Fig. 3 (a) is first closed for K1, and Fig. 3 (b) is closed again for K2, and Fig. 3 (c) is closed again for K3,
The last separating brake of Fig. 3 (d) K1, K2.
Fig. 4 is the graph of relation that the main and auxiliary switch maximum of 35kV systems closes shove peak value and parallel resistance.
Fig. 5 be the present invention suppress capacitive load cut-off overvoltage method switch separating brake precedence diagram (kilo-ohm level R2 be pressure limiting
Resistance), wherein, Fig. 5 (a) is first closed for K2, and Fig. 5 (b) divides again for K3, and Fig. 5 (c) finally divides for K2.
Fig. 6 is that 35kV systems the are main and auxiliary maximum graph of relation for recovering voltage and parallel resistance when cut-offfing.
Fig. 7 is that the suppression capacitive load that the present invention is provided closes the embodiment of the method flow chart for shoving or cut-offfing overvoltage.
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.Obviously, described embodiment is only a part of embodiment of the invention, rather than fully embodiment.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.
As shown in Fig. 2 closing the device embodiment schematic diagram for shoving and cut-offfing overvoltage for the present invention suppresses capacitive load.
The suppression capacitive load that the present embodiment is provided closes the device for shoving and cut-offfing overvoltage, including：Capacitive load breaker 100
With control module 200.
The capacitive load breaker 100 includes：Main switch K3, first resistor R1, the auxiliary of second resistance R2 and first
Switch K1, the second auxiliary switch K2；The first auxiliary switch K1 is in parallel with second resistance R2 after being connected with first resistor R1, then
It is in parallel with main switch K3 after being connected with the second auxiliary switch K2.
Parallel resistance is that first resistor R1 is in parallel with second resistance R2 and pressure limiting resistance i.e. second is electric including current-limiting resistance
Resistance R2.The resistance of parallel resistance within a predetermined range, is shoved according to closing for the major-minor switch of breaker, cut-offs overvoltage and electricity
Resistance energy consumption carrys out comprehensive decision.
The control module 200, for when the capacitive load is closed a floodgate with breaker 100, controlling the first auxiliary switch
K1 is first closed, and first resistor R1 is sealed in into loop；After predetermined amount of time, then the second auxiliary switch K2 is controlled to close, by the first electricity
The parallel resistance for hindering R1 and second resistance R2 is that current-limiting resistance seals in circuit；After predetermined amount of time, main switch K3 is finally controlled to close
Close, by current-limiting resistance short circuit, then control the first auxiliary switch K1 and the second auxiliary switch K2 separating brakes, can effective limiting circuit breaker
Close and shove；The control module 200, is additionally operable in 100 separating brake of capacitive load breaker, and control second is aided in
Switch K2 first closes a floodgate,；After predetermined amount of time, then main switch K3 separating brakes are controlled, the i.e. pressure limiting resistance of second resistance R2 is sealed in circuit；
After predetermined amount of time, the second auxiliary switch K2 separating brakes are finally controlled, cut-off circuit, effectively can cut-off limiting circuit breaker
Voltage.
As shown in Fig. 2 the capacitive load breaker 100 is connected in intermediate distribution system.
In embodiments of the present invention, parallel resistance is set in capacitive load breaker 100 and causes that power supply is surveyed to capacitive
Loop resistance increase when load is closed a floodgate, can close to capacitive load and shove and cut-off the amplitude of overvoltage and play a definite limitation
Effect, and damping action can be played to closing to shove and cut-off the oscillatory process of overvoltage, be conducive to accelerating the decay of amplitude.
It should be noted that, although be all parallel resistance, breaker when breaker and excision when capacitive load puts into
It is two different devices, the pass that is respectively used to meet during the closing operation of capacitive load breaker and shoves and separating brake
The limitation demand for cut-offfing overvoltage problem in operating process.Because the electromagnetic transient problems and inhibiting mechanism of both operating modes are present
Difference, it is different with the requirement of the resistance of sub-gate resistance to switching-on resistance, therefore Guan Heyong can not be suppressed simultaneously with a parallel resistance
Flow and cut-off overvoltage problem.The present invention is precisely in order to solve the capacitive load breaker of this problem offer.Hereinafter implement
The capacitive load breaker that the breaker of appearance is each meant in intermediate distribution system is not specifically stated in example.
Increase parallel resistance resistance, extension parallel resistance turn-on time can further strengthen and extend resistance and capacitive is returned
The damping action on road, so as to play further restriction effect to closing to shove and cut-off overvoltage, it is to avoid high-amplitude high frequency is closed
The appearance shoved with transient recovery voltage；Closing for capacitive load loop is shoved and load switch combined floodgate momentary breaks device two ends
Pressure difference is relevant with impedance loop, and parallel resistance is bigger, and auxiliary switch switching current connected in series is just smaller, therewith master in parallel
The electric current of switch is bigger；The overvoltage of cut-offfing of capacitive load switch is mainly determined by breaker transient recovery voltage, in parallel electric
The presence of resistance, not only provides the passage of release to the electric charge on electric capacity, reduces the voltage on electric capacity, and also reduce disconnected
Recover the amplitude of voltage on mouth, can avoid or reduce to restrike, so that reducing breaker cut-offs overvoltage.Parallel resistance can be played point
Pressure is acted on, and its value is bigger, and voltage is got on the just smaller but in parallel therewith main switch of voltage during auxiliary switch separating brake connected in series
Greatly.Increase parallel resistance resistance, extension parallel resistance turn-on time are conducive to reducing the amplitude for closing and shoving and cut-off overvoltage,
And shorten loop concussion die-away time.
Device provided in an embodiment of the present invention from close shove, cut-off overvoltage and parallel resistance energy consumption three in terms of carry out
The resistance selection of parallel resistance in breaker.No matter shoving or cut-offfing overvoltage to closing, major-minor switch is to parallel resistance
Resistance requirement is different.Parallel resistance is bigger, the auxiliary switch connected with parallel resistance shove and the maximum voltage that recovers is smaller, but
Be the main switch in parallel with parallel resistance shove and the maximum voltage that recovers is bigger, while the energy consumption of parallel resistance can increase.This
The suitable resistance for having determined parallel resistance is passed through in invention, both can guarantee that to major-minor switch flashy flow and the suppression for cut-offfing overvoltage
System, can meet the requirement of equipment tolerance again.
To more fully understand those skilled in the art and implementing technical scheme, introduce first below in open circuit
The effect of parallel resistance is set in device.
Referring to Fig. 1, the figure is that the conventional capacitive load that suppresses closes the schematic device for shoving or cut-offfing overvoltage.Electricity in parallel
Resistance R is in parallel with main switch K2 again after being connected with auxiliary switch K1.
During input capacitor bank, frequency can be produced to arrive several KHzs up to hundreds of, amplitude is up to tens times of running current
Inrush phenomenon.Parallel resistance is set, during input capacitor bank, each stage initial value and stable state of main and auxiliary switch motion
The subtractive of value is small, reduces the amplitude of capacitor two ends maximum overvoltage free component, and due to the damping action of resistance, accelerates
The decay of oscillatory process, amplitude further receives limitation.Compared with the breaker without parallel resistance, no matter main switch branch road
Or auxiliary switch branch road inrush phenomenon value has a certain degree of decrease.
During excision capacitor bank, due to the particularity for loading, there is recovery voltage higher between switch contact.Switch fracture
On recovery voltage formed by three partial stacks：Residual charge is determined on the forced component that is determined by system, parallel capacitor
Transient state component caused by fixed DC component, switch motion.Wherein forced component is fixed value, not by breaker parallel resistance
Influence, DC component and transient state component change with parallel resistance.
Parallel resistance is set, and during excision capacitor bank, the parallel resistance that loop seals in applies when sharing normal operation together
In the voltage at capacitor two ends, with the increase of resistance, the voltage that capacitor is got is gradually reduced, and auxiliary switch K1 actions are cut-off
After capacitor, the residual charge on capacitor also reduces therewith, reduces the initial DC component of capacitor bank.
After parallel resistance accesses circuit, the attribute of load is changed, it is negative with capacitances in series to be changed into resistance from capacitive load
Carry.During normal circuit breaker switching capacitive load, there are 90 degree of phase differences between electric current and voltage, when current over-zero ceases arc, electricity
Positive pressure is in peak value.After band parallel resistance breaker, resistance and capacitances in series reduce the phase difference of voltage and electric current,
During current over-zero breath arc, voltage not yet reaches peak value, reduces voltage magnitude during contact action, so as to inhibit transient state point
Amount.
In order to advantages of the present invention is better described, is described below and capacitive load suppress in the prior art closes and shove and open
The method of disconnected overvoltage.
In the prior art (Fig. 1), when putting into capacitor bank, first combined floodgate auxiliary switch K1, circuit is sealed in by parallel resistance R,
Closing main switch K2 again makes parallel resistance R exit circuit, and the parallel resistance value that inrush phenomenon is suppressed in intermediate distribution system is hundred
Europe level.During excision capacitor bank, first separating brake main switch K2, auxiliary switch K1 closure, now loop seals in parallel resistance, then separating brake
Auxiliary switch K1 disconnecting circuits.The parallel resistance resistance for suppressing to cut-off overvoltage in intermediate distribution system is kilo-ohm level.Therefore it is existing
Having technology can not shove and cut-off controlling consumption for overvoltage with a parallel resistance while meeting to close.
For problem above, the present invention proposes that a kind of suppression capacitive load closes the device and side for shoving and cut-offfing overvoltage
Method, meets to close and shoves and cut-off controlling consumption for overvoltage simultaneously using a set of parallel resistance.Compared with prior art,
Using device of the invention can to inrush phenomenon, cut-off overvoltage and play effective inhibitory action, be conducive to guarantee equipment to pacify
Complete and power network safety operation.
In the embodiment that the present invention is provided (Fig. 2), the preset range of the parallel resistance resistance is：Current-limiting resistance (first
The parallel resistance of resistance R1 and second resistance R2) it is hundred Europe level resistance, pressure limiting resistance (second resistance R2) is kilo-ohm level resistance.
Preferably, the parallel resistance resistance is taken as：R1 values are 130 ohm, and R2 values are 1835 ohm.
Preferably, the value of the predetermined amount of time of the combined floodgate is 10ms, and the value of the predetermined amount of time of separating brake is 20ms.
Describe the resistance of the parallel resistance in the capacitive load breaker that the present invention is provided in detail with reference to specific data
Value selection and the selection of turn-on time.
Based on the simulation model that typical data is built, certain 35kV reactive compensation system capacitive load is grasped with Circuit Breaker Switching
Calculating analysis is carried out, is compared from breaker parallel resistance resistance and in terms of turn-on time two respectively：
First below respectively from switch closing and switch opening when main and auxiliary switch the demand of parallel resistance resistance is compared.
(1) influence of the parallel resistance resistance to main and auxiliary switch inrush phenomenon
Selection to parallel resistance resistance below is analyzed.
Fig. 3 is that the present invention suppresses the switch switching order schematic diagram that capacitive load closes the method for shoving.When the capacitive is negative
During load breaker closing, successively closure causes transient process twice to main and auxiliary switch, and action twice is influenceed not by resistance value
Together.First auxiliary switch K1, the second auxiliary switch K2 successively closure by current-limiting resistance (first resistor R1 and second resistance R2's and
Connection resistance) circuit is sealed in, line conduction causes circuit transient process first；Main switch K3 is then closed by current-limiting resistance from line
Cut off in road, circuit completes closed action, causes second transient process.
Fig. 4 shoves peak value and current-limiting resistance value (first resistor R1 and for the main and auxiliary switch maximum that provides of the present invention is closed
The parallel value of two resistance R2) graph of relation.
From fig. 4, it can be seen that in the level Standard resistance range of hundred Europe, first in transient process, the second auxiliary switch K2 branch roads are most
Big inrush phenomenon reduces with the increase of current-limiting resistance value；In second transient process, main switch K3 branch roads maximum inrush phenomenon
Increase with the increase of current-limiting resistance value.Resistance near 122 Europe, the inrush phenomenon that main and auxiliary switching branches transient process causes
Maximum levels off to equal, effectively closing for limiting circuit breaker can shove.
During input capacitor bank, simulation result shows to extend current-limiting resistance turn-on time, can be risen to closing the decay shoved
To acceleration, but it is main by on-off time influence to close the maximum shoved, it is considered to which the closing moment of main and auxiliary switch is to shoving
Influence and current-limiting resistance energy consumption, during combined floodgate choose current-limiting resistance turn-on time be 10ms.
Fig. 5 is that the present invention suppresses the switch separating brake sequential schematic that capacitive load cut-offs overvoltage method.When the capacitive
During load breaker open operation, the influence that parallel resistance recovers voltage to main and auxiliary switch is also different.Second auxiliary switch K2
First close and second resistance R2 i.e. pressure limiting resistance is sealed in into circuit, then disconnect main switch K3, cause circuit transient process first；Finally
The second auxiliary switch K2 is disconnected, circuit disconnects, and causes second transient process.
Fig. 6 recovers voltage and (the second resistance R2 resistances of pressure limiting resistance value for maximum when the main and auxiliary switch that the present invention is provided cut-offs
Value) graph of relation.
From fig. 6, it can be seen that in kilo-ohm level Standard resistance range, first in transient process, the maximum of main switch K3 recovers electricity
Pressure increases with the increase of pressure limiting resistance value；In second transient process, the maximum voltage that recovers of the second auxiliary switch K2 is with limit
The increase of piezoelectricity resistance and reduce.Near 1835 Europe, the recovery voltage max of main and auxiliary switch motion levels off to phase to resistance
Overvoltage is cut-off Deng, effective limiting circuit breaker.
During excision capacitor bank, because the switch off time of breaker is that current zero-crossing point really breaks after the moment is set
Open, therefore the setting of the turn-on time of pressure limiting resistance should cause that the actuation time interval that main and auxiliary switch is set is more than power-frequency voltage
Half period, to ensure the sequencing that main and auxiliary switch actually cut-offs, it is also contemplated that the energy consumption of pressure limiting resistance, chooses during separating brake
Pressure limiting resistance turn-on time is set to 20ms.
In terms of resistance energy consumption, document [Kamikawaji T, Shiori T, Funahashi T, et a1.An
investigation into major factors in shunt capacitor switching performances by
vacuum circuit breakers with copperchromium contacts[J].IEEE Transactions on
Power Delivery, 1993,8 (4)：1789-1795.] energy consumption in resistance during switching is studied, the above
In the Standard resistance range that analysis is obtained, resistance energy consumption can meet requirement.
As seen from the above analysis, from close shove, cut-off overvoltage and parallel resistance energy consumption three in terms of comprehensive ratio
Compared with capacitive load breaker installs first resistor R1 for 130 Europe, second resistance R2 are 1835 Europe in 35kV reactive compensation systems
Parallel resistance, current-limiting resistance turn-on time is taken as 10ms during combined floodgate, that piezoresistance turn-on time in separating brake time limit is taken as 20ms is more excellent.
Compared with prior art, the device for being provided using the present invention can to Circuit Breaker Switching capacitive load when the pass that produces
Conjunction shoves, cut-off overvoltage plays effective restriction effect, and meets the requirement of breaker apparatus manufacture level.
A kind of suppression capacitive load breaker provided based on above example closes the dress for shoving and cut-offfing overvoltage
Put, the embodiment of the present invention also provides a kind of suppression capacitive load breaker and closes the method for shoving and cut-offfing overvoltage, below
It is described with reference to the accompanying drawings.
Referring to Fig. 7, the figure shoves and cut-off electricity for a kind of suppression capacitive load breaker for providing of the invention is closed
Embodiment of the method-the flow chart of pressure.
A kind of suppression capacitive load breaker that the present embodiment is provided closes the method for shoving and cut-offfing overvoltage, applies
In the capacitive load breaker control of intermediate distribution system, the capacitive load breaker is series at intermediate distribution system
In, comprise the following steps：
S701：When the capacitive load is closed a floodgate with breaker 100, in the control capacitive load breaker first
Auxiliary switch K1 is first closed during the first resistor R1 sealed in into loop, is closed again the second auxiliary switch K2 by current-limiting resistance (
The parallel resistance of one resistance R1 and second resistance R2) seal in circuit；
S702：Since the first auxiliary switch K1, the second auxiliary switch K2 closure after start predetermined amount of time after, control institute
The main switch K3 closures of capacitive load breaker are stated, by the current-limiting resistance short circuit, the first auxiliary switch K1, the is finally disconnected
Two auxiliary switch K2, effectively closing for limiting circuit breaker can shove.
S703：When the capacitive load breaker open operation, in the state of operation is switched, the capacitive load is controlled
First closed with the second auxiliary switch K2 in breaker, then disconnecting main switch K3 makes the i.e. pressure limiting resistance of second resistance R2 seal in electricity
Road；
S704：After predetermined amount of time is started after main switch K3 disconnections, control the second auxiliary switch K2 cut-offs
Circuit, effectively can cut-off overvoltage by limiting circuit breaker.
The resistance of parallel resistance within a predetermined range, shoved according to closing for the major-minor switch of breaker, cut-off overvoltage with
And resistance energy consumption carrys out comprehensive decision.
Increase parallel resistance resistance, extension parallel resistance turn-on time can further strengthen and extend resistance and capacitive is born
The damping action in loop is carried, so as to closing for capacitive load breaker is shoved and be cut-off the amplitude of overvoltage and played further
Restriction effect, and accelerate the decay of amplitude.
Device provided in an embodiment of the present invention shoves from closing for main and auxiliary switch, transient recovery voltage and parallel resistance energy
Three aspects of consumption carry out the resistance selection of parallel resistance in capacitive load breaker.Closing for main switch is shoved and transient recovery
Voltage increases with the increase of parallel resistance resistance, but closing for auxiliary switch is shoved with transient recovery voltage with simultaneously simultaneously
Join the increase of resistance and reduce.It is of the invention current-limiting resistance of the parallel resistance when closing a floodgate to be determined respectively and divides by research
The suitable resistance of pressure limiting resistance during lock, both can guarantee that the suppression to main and auxiliary switch inrush phenomenon, also can guarantee that and opens main and auxiliary
Cut-off the suppression of overvoltage in pass, moreover it is possible to meet the requirement of equipment tolerance.
Go out in middle pressure capacitive load breaker by analysis of simulation experiment in the embodiment of the present invention, the parallel resistance
Resistance span be preferably：Current-limiting resistance (parallel resistance of first resistor R1 and second resistance R2) is hundred Europe level resistance,
Pressure limiting resistance (second resistance R2) is kilo-ohm level resistance.
By experimental analysis, the value of the combined floodgate predetermined amount of time is 10ms, and the value of separating brake predetermined amount of time is
20ms。
Preferably, the parallel resistance resistance is taken as：First resistor R1 values are 130 ohm, and second resistance R2 values are
1835 ohm.
Specific experiment data can be found in Fig. 4 and Fig. 6, will not be repeated here.
Using the method for the present invention, can with a set of parallel resistance to capacitive load breaker operator when close and shove
Effective inhibitory action is played with overvoltage is cut-off, reduces the probability of happening of repeated breakdown, be conducive to ensureing that equipment safety and power network are pacified
Full stable operation.The resistance of the parallel resistance provided using the present invention and turn-on time, it is possible to achieve the breaker carries out capacitive
The requirement that overvoltage problem meets control is shoved and cut-off to closing during load switching.
The above, is only presently preferred embodiments of the present invention, and any formal limitation is not made to the present invention.Though
So the present invention is disclosed above with preferred embodiment, but is not limited to the present invention.Any those of ordinary skill in the art,
In the case where technical solution of the present invention ambit is not departed from, the methods and techniques content of the disclosure above is may be by skill of the present invention
Art scheme makes many possible variations and modification, or the Equivalent embodiments for being revised as equivalent variations.Therefore, it is every without departing from this
The content of inventive technique scheme, according to technical spirit of the invention to any simple modification made for any of the above embodiments, equivalent change
Change and modify, still fall within the range of technical solution of the present invention protection.
Claims (5)
1. a kind of suppression capacitive load closes the device for shoving and cut-offfing overvoltage, it is characterised in that：Use disconnected including capacitive load
The control module (200) that road device (100) and control capacitive load are closed a floodgate and closed with breaker (100) breaker in middle, the appearance
Property load with breaker (100) include the first auxiliary switch (K1), the second auxiliary switch (K2), main switch (K3), first resistor
And second resistance (R2) (R1)；First auxiliary switch (K1) is in parallel with second resistance (R2) after being connected with first resistor (R1), then
It is in parallel with main switch (K3) after being connected with the second auxiliary switch (K2), wherein：First resistor (R1) and second resistance (R2) are in parallel
The parallel resistance for being formed afterwards is current-limiting resistance, and second resistance (R2) is limited piezoresistance.
2. a kind of suppression capacitive load according to claim 1 closes the device for shoving and cut-offfing overvoltage, and its feature exists
In：The current-limiting resistance is hundred Europe level resistance, and the pressure limiting resistance is kilo-ohm level resistance.
3. a kind of suppression capacitive load according to claim 2 closes the device for shoving and cut-offfing overvoltage, and its feature exists
In：The resistance of the first resistor (R1) is 130 ohm, and the resistance of second resistance (R2) is 1835 ohm.
4. the device suppression capacitive load described in any one of claims 1 to 3 closes the method for shoving and cut-offfing overvoltage, and it is special
Levy and be：Suitable for the capacitive load of intermediate distribution system, the capacitive load breaker (100) is series at medium-voltage distribution system
In the capacitive load of system；
When the capacitive load is closed a floodgate with breaker (100), control module (200) controls the first auxiliary switch (K1) first to close
Close, first resistor (R1) is sealed in into loop；After predetermined amount of time, control module (200) controls the second auxiliary switch (K2) to close again
Close, the parallel resistance by first resistor (R1) and second resistance (R2) is that current-limiting resistance seals in circuit；After predetermined amount of time, finally
Control module (200) controls main switch (K3) closure, by current-limiting resistance short circuit, then controls the first auxiliary switch (K1) and second
Auxiliary switch (K2) separating brake, effectively closing for limiting circuit breaker can shove；When capacitive load breaker (100) separating brake
When, control module (200) controls the second auxiliary switch (K2) first to close a floodgate；After predetermined amount of time, control module (200) controls master again
Switch (K3) separating brake, makes second resistance (R2) i.e. pressure limiting resistance seal in circuit；After predetermined amount of time, last control module (200)
The second auxiliary switch (K2) separating brake is controlled, cut-off circuit, effectively can cut-off overvoltage by limiting circuit breaker, during separating brake,
The actuation time interval of setting is more than supply voltage half period, to ensure the sequencing for actually cut-offfing.
5. method according to claim 4, it is characterised in that：The value of the predetermined amount of time of the combined floodgate is 10ms, point
The value of the predetermined amount of time of lock is 20ms.
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| CN106711924B (en) | 2018-01-23 |
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