CN108667039B - A kind of special switch and method for shunt peaking circuit switching - Google Patents
A kind of special switch and method for shunt peaking circuit switching Download PDFInfo
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- CN108667039B CN108667039B CN201810486232.0A CN201810486232A CN108667039B CN 108667039 B CN108667039 B CN 108667039B CN 201810486232 A CN201810486232 A CN 201810486232A CN 108667039 B CN108667039 B CN 108667039B
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- switch
- major loop
- shunt peaking
- circuit
- peaking circuit
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Abstract
A kind of special switch and method for shunt peaking circuit switching, the special switch include shunt peaking circuit special switch and control module, and shunt peaking circuit special switch includes major loop switch and capacitive branch switch；Its method are as follows: when combined floodgate, control module controls major loop and switchs first separating brake；Capacitive branch is controlled again to close the switch；Finally control major loop closes the switch, and can minimize closing for main and auxiliary switch and shove；When separating brake, control module controls major loop and switchs first separating brake；Then control capacitive branch switchs separating brake again；Finally control major loop closes the switch, and can minimize main and auxiliary switch cut-offs overvoltage；The present invention can be in the case where not adding protection circuit, shoving when minimizing shunt peaking circuit switching with more reasonable switching operation and overvoltage problem.
Description
Technical field
It is the present invention relates to medium-voltage distribution equipment technical field, in particular to a kind of for the dedicated of shunt peaking circuit switching
Switch and method.
Background technique
The main problem of Circuit Breaker Switching shunt peaking circuit is: investment parallel capacitor group when closing shove and
Overvoltage is cut-off when exiting parallel capacitor group, both can be generated to close when closing a floodgate and be shoved, can generate and cut-off in separating brake
Overvoltage.
As shown in Figure 1, being usually powered on state switching simultaneously in major loop inductive load when switching shunt peaking circuit
Join capacitor group, but since the sequence of movement of major loop breaker with capacitive branch breaker can make character of circuit different, so
The difference of main and auxiliary action sequence, which will affect to close, shoves and cut-offs overvoltage.
Therefore, in the case where not adding protection circuit, the movement for needing to study the main and auxiliary breaker of shunt peaking circuit is suitable
Ordered pair closes the influence for shoving and cut-offfing overvoltage, is closed with to reach reduction using circuit temporal structure as much as possible and shoves and open
The purpose of disconnected overvoltage.
Summary of the invention
In order to overcome the problems, such as that above-mentioned existing operation exists, the purpose of the present invention is to provide one kind for shunt compensation electricity
The special switch and method of road switching can utilize as much as possible circuit temporal structure in the case where not adding protection circuit,
Overvoltage problem is shoved and cut-off to closing when reducing shunt peaking circuit switching.
In order to achieve the above object, the present invention adopts the following technical scheme:
A kind of special switch for shunt peaking circuit switching, including shunt peaking circuit definite purpose circuit breaker 100 and
The control module 200 that switch closing and switch opening is switched in shunt peaking circuit definite purpose circuit breaker 100 is controlled, the shunt peaking circuit is special
It include major loop switch K1 and capacitive branch switch K2 with breaker 100；Capacitive branch switch K2 and parallel capacitor group
It is in parallel with inductive load after series connection, then connect with major loop switch K1.
The method that the special switch is used for shunt peaking circuit switching, the shunt compensation suitable for intermediate distribution system
Circuit, the shunt peaking circuit definite purpose circuit breaker 100 are series at the power supply and shunt peaking circuit of intermediate distribution system
Between；When the shunt peaking circuit definite purpose circuit breaker 100 closes a floodgate, control module 200 controls major loop switch K1 elder generation separating brake；
After predetermined amount of time, control module 200 controls capacitive branch switch K2 closure again, and it is negative that parallel capacitor group is incorporated to perception
It carries, capacitive branch and inductive load circuit in series are discharged at this time；After predetermined amount of time, control module 200 controls again to be led back
Way switch K1 closure, by and have capacitive supplement branch inductive load major loop entirely seal in circuit, open circuit can be minimized
Closing for device is shoved, and the actuation time of setting should be such that the energy stored in inductive load discharges completely；When the shunt compensation electricity
When 100 separating brake of definite purpose circuit breaker of road, control module 200 controls major loop switch K1 elder generation separating brake, disconnects entire shunt peaking circuit；
After predetermined amount of time, control module 200 controls capacitive branch switch K2 separating brake again, and after predetermined amount of time, control module 200 is last
Major loop switch K1 closure is controlled, so that parallel capacitor group is exited circuit, can minimize breaker cut-off electricity
Pressure, when separating brake, the actuation time interval of setting is greater than supply voltage half period, with the sequencing for ensuring actually to cut-off.
When the switching shunt peaking circuit, the major loop switch K1 and capacitive branch switch K2 feed motion
The value of predetermined amount of time is 20ms or more.
The present invention is compared to the prior art compared with having following advantage:
Special switch provided by the invention and method from close shove, cut-off overvoltage two in terms of carry out shunt peaking circuit
The sequence of movement selection of main and auxiliary switch when switching may be implemented to utilize circuit transient state knot in the case where not adding protection circuit
Overvoltage is shoved and cut-off to closing when structure, as much as possible reduction shunt peaking circuit switching, reduces in intermediate distribution system simultaneously
Join compensation circuit switching failure.It shoves or cut-offs overvoltage and circuit temporal structure due to being closed when switching shunt peaking circuit and have
It closes, and when routine operation faces severeer allowable load switching, closes and shoves or cut-off overvoltage problem；The present invention provides
A kind of motion action sequence of main and auxiliary switch, can be in the case where not adding protection circuit, using circuit temporal structure, to the greatest extent
Overvoltage is shoved and cut-off to closing when possibly reducing shunt peaking circuit switching.
Detailed description of the invention
Fig. 1 is conventional shunt peaking circuit fling-cut switch schematic diagram and action sequence figure, wherein Fig. 1 (a) is conventional simultaneously
Join compensation circuit fling-cut switch schematic diagram, Fig. 1 (b) is that K1 is first closed, and Fig. 1 (c) is that K2 is closed again, and Fig. 1 (d) is that K2 divides again.
Fig. 2 is the special switch embodiment schematic diagram of shunt peaking circuit switching of the present invention.
Fig. 3 inhibits to close the switch switching order schematic diagram for the method for shoving when being present invention investment shunt peaking circuit,
In, Fig. 3 (a) is that K1 first divides, and Fig. 3 (b) is that K2 is closed again, and Fig. 3 (c) is that K1 finally closes a floodgate.
Fig. 4 is that 35kV shunt compensation system inlet wire main switch K1, capacitive branch switch K2 maximum close the peak value that shoves and compare
Figure, wherein Fig. 4 (a) is that maximum when K1 first closes a floodgate after combined floodgate K2 closes the peak value that shoves and compares figure, and Fig. 4 (b) is that K2 first closes a floodgate K1
Maximum when closing a floodgate afterwards closes the peak value that shoves and compares figure.
Fig. 5 is the switch separating brake sequential schematic for inhibiting to cut-off overvoltage method when the present invention exits shunt peaking circuit,
Wherein, Fig. 5 (a) is that K1 first divides, and Fig. 5 (b) is that K2 divides again, and Fig. 5 (c) is that K1 is finally closed.
Fig. 6 is that maximum restores Voltage Peak when 35kV shunt compensation system inlet wire main switch K1, capacitive branch switch K2 are cut-off
Value compares figure, wherein the maximum voltage peak that restores after Fig. 6 (a) is K1 elder generation separating brake K2 when separating brake compares figure, and Fig. 6 (b) is K2 first
The maximum voltage peak that restores after separating brake K1 when separating brake compares figure.
Fig. 7 is that inhibition capacitive load provided by the invention closes the embodiment of the method flow chart for shoving or cut-offfing overvoltage.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description.Obviously, described embodiments are only a part of the embodiments of the present invention, rather than fully embodiment.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
As shown in Fig. 2, for a kind of special switch embodiment schematic diagram for shunt peaking circuit switching of the present invention.This reality
Apply the special switch for shunt peaking circuit switching of example offer, comprising: shunt peaking circuit definite purpose circuit breaker 100 and control
Module 200.
The shunt compensation definite purpose circuit breaker 100 includes: major loop switch K1 and capacitive branch switch K2；Capacitive branch
Switch K2 is in parallel with inductive load after connecting with parallel capacitor group, then connects with major loop switch K1.
The control module 200, for controlling in the combined floodgate of definite purpose circuit breaker 100 of the shunt peaking circuit switching
Major loop switch K1 is first disconnected, inductive load power-off electric discharge；After predetermined amount of time, control module 200 controls capacitive branch again and opens
K2 closure is closed, shunt capacitor group is incorporated to inductive load；After predetermined amount of time, control module 200 controls major loop switch again
The inductive load major loop for being parallel with capacitive supplement branch is entirely sealed in circuit, can minimize breaker by K1 closure
It closes and shoves；When 100 separating brake of shunt peaking circuit definite purpose circuit breaker, it is first that control module 200 controls major loop switch K1
Separating brake disconnects entire shunt peaking circuit；After predetermined amount of time, control module 200 controls capacitive branch switch K2 separating brake again, in advance
After section of fixing time, finally control major loop switch K1 is closed control module 200, and parallel capacitor group is made to exit circuit, energy
Enough minimize breaker cut-offs overvoltage.
As shown in Fig. 2, the definite purpose circuit breaker 100 of the shunt peaking circuit switching is connected in intermediate distribution system.
In embodiments of the present invention, the movement that main and auxiliary switch is controlled in shunt peaking circuit definite purpose circuit breaker 100 is suitable
Sequence can play the role of certain restrictions to closing to shove and cut-off the amplitude of overvoltage.
It should be noted that conventional parallel capacitor group switching operation, be in inductive load energized state investment or
Exit shunt capacitor group, capacitive branch switch on-off capacitive circuit can bring biggish close to shove and cut-off overvoltage and ask
Topic.The present invention is precisely in order to alleviate the shunt peaking circuit switching definite purpose circuit breaker that this problem provides.Do not have in following embodiment
There is the breaker for particularly pointing out appearance to each mean the shunt peaking circuit switching definite purpose circuit breaker in intermediate distribution system.
The sequence of movement for reasonably selecting main and auxiliary switch when switching shunt peaking circuit may be implemented do not adding protection electricity
In the case where road, closing when using circuit temporal structure, as much as possible reduction shunt peaking circuit switching is shoved and was cut-off
Voltage reduces shunt peaking circuit switching failure in intermediate distribution system.When putting into parallel capacitor group, inlet wire is first disconnected
Main switch, closure capacitive branch switch, after inductive load is substantially discharged, then closes main switch, is equivalent to investment one by holding
Property compensated inductive load can avoid high-amplitude high frequency in this case and close the appearance shoved.Cut off parallel capacitor
When group, inlet wire main switch is first disconnected, after compensation loop power decaying, then capacitive branch switch is disconnected, can avoid exiting benefit in parallel
High-amplitude high frequency transient when repaying capacitor group restores the appearance of voltage；The closing of shunt compensation system shove and cut-off overvoltage with
Circuit temporal structure is related, rationally controls the action sequence of shunt compensation system, can reduce to close and shove and cut-off electricity
Press maintaining system safety operation.
Special switch provided in an embodiment of the present invention from close shove, cut-off overvoltage two in terms of carry out shunt compensation electricity
The sequence of movement selection of main and auxiliary switch when the switching of road.The present invention has determined main and auxiliary when shunt peaking circuit switching open after study
The sequence of movement of pass utilizes circuit temporal structure, as much as possible reduction shunt compensation electricity in the case where not adding protection circuit
The closing when switching of road is shoved and cut-offs overvoltage.
To more fully understand those skilled in the art and implementing technical solution of the present invention, in parallel mend is introduced first below
Repay the circuit structure of capacitor group reactive power compensation circuit.
Referring to Fig. 1, which is the electrical block diagram of certain shunt capacitor group reactive power compensation circuit.Major loop switch K1
The shunt circuit constituted with inductive load and capacitor group is connected, and capacitive branch switch K2 connects with compensation capacitor group.
The operation/cutting method of shunt peaking circuit in the prior art is described below in order to better illustrate the present invention the advantages of.
(Fig. 1) in the prior art, when switching parallel capacitor group, inductive load is not powered off, i.e. major loop switch K1
Always it is closed (Fig. 1 b), when putting into capacitor group, capacitor group is incorporated to circuit (Fig. 1 c) by capacitive branch switch K2 closure, is exited
When capacitor group, capacitive branch switch K2 is disconnected, and capacitor group is exited circuit (Fig. 1 d).
When putting into capacitor group, frequency can be generated up to several hundred and arrive several kHz, amplitude is up to tens times of running current
Inrush phenomenon.When cutting off capacitor group, due to the particularity of capacitive load, there are higher recovery voltages between switch contact.
Recovery voltage on switch fracture is formed by stacking by three parts: residual on the forced component that is determined by system, parallel capacitor
The DC component of staying charge to determine, transient state component caused by switch motion.Therefore in the prior art switched capacitor group when, capacitive
Biggish close will be born on branch switch shoves and cut-off overvoltage.
In view of the above problems, the present invention proposes a kind of special switch and method for shunt peaking circuit switching, utilize
The temporal structure of circuit is cooperated by the sequence of movement of main and auxiliary switch, to alleviate closing during shunt peaking circuit switching
It shoves and cut-offs overvoltage problem.Compared with prior art, protection can not increased using special switch of the invention
In the case where circuit, overvoltage is shoved and cut-off to closing when reducing shunt peaking circuit switching as much as possible, is conducive to ensure
Equipment safety and power network safety operation.
In embodiment provided by the invention (Fig. 2), the circuit structure of the shunt peaking circuit switching special switch 100
Are as follows: major loop switch K1 connects with the shunt circuit that inductive load and capacitor group are constituted, capacitive branch switch K2 and compensation electricity
The series connection of container group, the sequence of movement of major loop switch K1 and capacitive branch switch K2 are controlled by control module 200.
Below with reference to main and auxiliary in the specific data shunt peaking circuit switching definite purpose circuit breaker that the present invention will be described in detail provides
The sequence of movement of switch and the selection of actuation time.
Based on the simulation model that typical data is built, certain 35kV reactive compensation system definite purpose circuit breaker switching operation is carried out
Analysis is calculated, respectively in terms of major loop switch with the sequence of movement of two breakers of capacitive branch switch and actuation time two
It is compared:
First below respectively from switch closing and switch opening when major loop switch and capacitive branch action sequence shove to closing
It is compared with the influence for cut-offfing overvoltage.
(1) switching order closes the influence shoved to major loop switch, capacitive branch
The switching order of major loop switch, capacitive branch switch is analyzed the influence shoved is closed below.
Fig. 3 inhibits to close the switch switching order schematic diagram for the method for shoving when being present invention investment shunt peaking circuit.When
When the shunt peaking circuit definite purpose circuit breaker 100 closes a floodgate, major loop switch K1 is first disconnected, is cut off the power, then close capacitive branch
Way switch K2 finally closes major loop switch K1 after inductive load loop electric discharge.The shadow by circuit temporal structure is acted three times
Sound makes to close difference of shoving.Using the temporal structure of circuit, capacitive load Input is converted to after capacitor group supplement
Inductive load Input.
When putting into capacitor group, when the actuation time of setting considers to close major loop switch K1, it should make to store up in inductive load
The energy deposited discharges completely, choose when combined floodgate capacitive branch switch K2 turn-on time be 20ms after close major loop again and switch
K1。
Fig. 4 is 35kV shunt compensation main loop switch K1, capacitive branch switch K2 maximum closes the peak value that shoves and compares
Figure, wherein Fig. 4 (a) is that maximum when K1 first closes a floodgate after combined floodgate K2 closes the peak value that shoves and compares figure, and Fig. 4 (b) is that K2 first closes a floodgate K1
Maximum when closing a floodgate afterwards closes the peak value that shoves and compares figure.Simulation result when by comparison switch K1, K2 difference switching order can
Know, the size that breaker closing shoves is mainly related with the actuation time of rear closure switch, more connects when the actuation time of the switch
When nearly voltage peak, the inrush phenomenon value generated on major loop switch K1 and capacitive branch switch K2 is bigger, at voltage peak
Reach maximum value；No matter K1, K2 which switch first close a floodgate, the maximum value of inrush phenomenon is both present in (Fig. 4 on major loop switch K1
In curve I)；And K1, which first closes K2 and closes the inrush phenomenon maximum value ratio K2 of generation again, first to be closed, and K1 closes the inrush phenomenon of generation again
Maximum value is bigger.Maximum when major loop switch K1 is first closed, capacitive branch switch K2 is reclosed, under this system parameter on K1
The high-frequency current (Fig. 4 a) of about 5.1 times power frequency electric flow valuves of shoving；When capacitive branch switch K2 is first closed, is closed after major loop switch K1
When conjunction, the peak inrush current under this system parameter on K1 is about the high-frequency current (Fig. 4 b) of 4.6 times of power frequency electric flow valuves.This system parameter
The power current that the difference for the peak inrush current that lower two kinds of switching orders generate is about 0.5 times.Accordingly when vacuum switch puts into parallel connection
When capacitor group, the action sequence of recommendation is: first disconnecting major loop switch K1, recloses capacitive branch switch K2, finally
Be closed major loop switch K1, in this way can effective closing for limiting circuit breaker shove.
(2) separating brake sequence cut-offs the influence of overvoltage to inlet wire main switch, capacitive branch
The separating brake sequence of inlet wire main switch, capacitive branch switch analyzes the influence for cut-offfing overvoltage below.
Fig. 5 is the switch separating brake sequential schematic for inhibiting to cut-off overvoltage method when the present invention exits shunt peaking circuit.
When 100 separating brake of shunt peaking circuit definite purpose circuit breaker, major loop switch K1 is first disconnected, is cut off the power, to inductive load
After the electric discharge of circuit, then capacitive branch switch K2 is disconnected, finally closes major loop switch K1.Using the temporal structure of circuit, will hold
Property load exit the inductive load that problem is converted to after capacitor group supplement and exit problem.
During switching parallel connection supplements capacitor group, the time interval of switch motion be there are certain requirements.If the sense charged
Property load or capacitive compensation branch and power supply cut off, the dynamic of other switches can be operated after enough time should being kept to be substantially discharged
Make, switch motion time interval should take 20ms or more at this time；In addition when switching separating brake because the switch off time of breaker be
The current zero-crossing point after the moment is arranged just really to disconnect, thus after separating brake the time interval of next switch motion should take 20ms with
On, to ensure to switch the sequencing actually cut-off.
Fig. 6 is that maximum restores Voltage Peak when 35kV shunt compensation main loop switch K1, capacitive branch switch K2 are cut-off
Value compares figure, wherein the maximum voltage peak that restores after Fig. 6 (a) is K1 elder generation separating brake K2 when separating brake compares figure, and Fig. 6 (b) is K2 first
The maximum voltage peak that restores after separating brake K1 when separating brake compares figure.Emulation when by comparison switch K1, K2 difference separating brake sequence
As a result it is found that maximum recovery voltage appears in first open switch above (the curve VK2 in curve VK1, Fig. 6 b in Fig. 6 a) always, most
It is big restore voltage magnitude and K1, K2 to cut-off sequence related, first divide major loop switch K1, again partial volume branch switch K2, than elder generation
Partial volume branch switch K2, divide major loop switch K1 again, the maximum recovery voltage generated on switch is smaller.Major loop is disconnected in the ban
Switch K1, then when disconnecting capacitive branch switch K2, maximum voltage is appeared in always on major loop switch K1, under this system parameter about
It is 1.2 times (Fig. 6 a) of supply voltage；When disconnecting capacitive branch switch K2 in the ban, then disconnecting major loop switch K1, maximum voltage
Always it appears in out on capacitive branch switch K2, is about 2 times (Fig. 6 b) of supply voltage under this system parameter.Under this system parameter
Two kinds of separating brake sequences are maximum to cut-off the supply voltage that the difference of overvoltage is about 0.8 times.Accordingly when vacuum switch exits electricity in parallel
When container group, the action sequence of recommendation is: first disconnecting major loop switch K1, then disconnects capacitive branch switch K2, finally closes
Close major loop switch K1, in this way can effective limiting circuit breaker cut-off overvoltage.
As seen from the above analysis, from close shove, cut-off overvoltage two in terms of be comprehensively compared, medium voltage distribution network is simultaneously
Join reactive power compensation circuit switching definite purpose circuit breaker installing major loop switch K1, capacitive branch switch K2 and control module 200.Control
Action sequence when module 200 controls parallel capacitor group investment is first to divide K1, then close K2, finally closes K1；Control
Action sequence when module control parallel capacitor group exits is first to divide K1, then divide K2, finally closes K1.Put into capacitor
The closing time interval of K1 and K2 should take 20ms or more when device group, and the opening time interval of K2 and K1 is also answered when exiting capacitor group
20ms or more is taken, so that inductive load loop is substantially discharged, in addition after either switch separating brake between the time of next switch motion
Every 20ms or more should be taken, to ensure to switch the sequencing actually cut-off.
It compared with prior art, can be in the case where not increasing protection circuit, as far as possible using device provided by the invention
Overvoltage is shoved and is cut-off in closing for generating when reducing Circuit Breaker Switching shunt peaking circuit, and meets breaker apparatus manufacture
Horizontal requirement.
Based on a kind of special switch for shunt peaking circuit switching that above embodiments provide, the embodiment of the present invention is also
A kind of special method for shunt peaking circuit switching is provided, is described in detail with reference to the accompanying drawing.
Referring to Fig. 7, which is a kind of special method embodiment-for shunt peaking circuit switching provided by the invention
Flow chart.
A kind of special method for shunt peaking circuit switching provided in this embodiment, applied to intermediate distribution system
In the control of shunt peaking circuit switching definite purpose circuit breaker, during the definite purpose circuit breaker for shunt peaking circuit switching is series at
It is press-fitted in electric system, comprising the following steps:
S701: when the shunt peaking circuit definite purpose circuit breaker 100 closes a floodgate, it is dedicated disconnected to control the shunt peaking circuit
Major loop switch K1 in road device 100, which is first disconnected, disconnects inductive load and power supply, after predetermined amount of time, recloses capacitive branch
Switch K2 is in parallel with inductive load by capacitor group；
S702: after control capacitive branch switch K2 closure after predetermined amount of time, the shunt compensation is controlled
The major loop switch K1 of circuit definite purpose circuit breaker is reclosed, and the load and parallel capacitor group are put into circuit.It is this
Action sequence can minimize closing for breaker and shove in the case where not increasing protection circuit.
S703: when 100 separating brake of shunt peaking circuit definite purpose circuit breaker, in the state of switching operation, institute is controlled
The major loop switch K1 stated in shunt peaking circuit definite purpose circuit breaker is first disconnected, and after predetermined amount of time, then is disconnected capacitive branch and is opened
K2 is closed, shunt capacitor group is exited into circuit；
S704: after capacitive branch switch K2 disconnection after predetermined amount of time, the shunt peaking circuit is controlled
The major loop switch K1 of definite purpose circuit breaker is reclosed, and load is sealed in circuit.This action sequence can not increase protection
In the case where circuit, minimize breaker cut-offs overvoltage.
Using the temporal structure of circuit, inlet wire main switch, capacitive branch switch when rationally controlling switching shunt peaking circuit
Sequence of movement, can not add protection circuit in the case where, as much as possible reduction shunt peaking circuit switching when closing
It shoves and cut-offs overvoltage, reduce shunt peaking circuit switching failure in intermediate distribution system.
Device provided in an embodiment of the present invention shoves and cut-offs recovery electricity from inlet wire main switch, closing for capacitive branch switch
Two aspects are pressed to carry out the definite purpose circuit breaker design of shunt peaking circuit switching.What major loop switch and capacitive branch switched closes
It shoves related with action sequence with transient recovery voltage.The present invention has determined that original capacitor group is thrown respectively after study
Action sequence when entering and exiting can minimize inlet wire main switch, capacitive in the case where not increasing protection circuit
The inrush phenomenon of branch switch and cut-off overvoltage, moreover it is possible to meet the requirement of equipment tolerance.
Go out in shunt peaking circuit switching definite purpose circuit breaker in the embodiment of the present invention by analysis of simulation experiment, it is described special
With switching device are as follows: major loop switch is connected in series with power supply and inductive load, and capacitive branch switchs company of connecting with capacitor group
It is connected in parallel after connecing with inductive load, control module controls the movement of major loop switch and capacitive branch switch.
By experimental analysis, the value of the predetermined amount of time is 20ms or more.
Preferably, the special switch for shunt peaking circuit switching, when putting into capacitor group, the switch of recommendation is dynamic
Work sequence is first to divide major loop switch K1, then close capacitive branch switch K2, is finally closed major loop switch K1；Exit capacitor
When group, the action sequence of recommendation is first to divide major loop switch K1, then disconnect capacitive branch switch K2, and finally closure is led back
Way switch K1.
Representative experimental data can be found in Fig. 4 and Fig. 6, and details are not described herein.
Using method of the invention, major loop switch, capacitive can be minimized in the case where not increasing protection circuit
It the inrush phenomenon of branch switch and cut-offs overvoltage, reduces fault rate when shunt peaking circuit switching, be conducive to protect
Hinder equipment safety and power network safety operation.Using action sequence provided by the invention and turn-on time, can alleviate
Overvoltage problem is shoved and cut-off to closing for breaker when shunt peaking circuit switching.
The above described is only a preferred embodiment of the present invention, being not intended to limit the present invention in any form.Though
So the present invention has been disclosed as a preferred embodiment, but is not intended to limit the invention.Anyone skilled in the art,
Without departing from the scope of the technical proposal of the invention, it may be by the methods and technical content of the disclosure above to skill of the present invention
Art scheme makes many possible changes and modifications or equivalent example modified to equivalent change.Therefore, all without departing from this
The content of inventive technique scheme, according to the technical essence of the invention any simple modification made to the above embodiment, equivalent change
Change and modify, all of which are still within the scope of protection of the technical scheme of the invention.
Claims (2)
1. a kind of method of shunt peaking circuit switching, this method uses the special switch for shunt peaking circuit switching real
Existing, the special switch for shunt peaking circuit switching includes shunt peaking circuit definite purpose circuit breaker (100) and control
The control module (200) of switch switch closing and switch opening, the shunt peaking circuit are special in shunt peaking circuit definite purpose circuit breaker (100)
It include major loop switch (K1) and capacitive branch switch (K2) with breaker (100)；Capacitive branch switchs (K2) and shunt compensation
It is in parallel with inductive load after the series connection of capacitor group, then connect with major loop switch (K1)；
It is characterized by: the method for the shunt peaking circuit switching is suitable for the shunt peaking circuit of intermediate distribution system, institute
Shunt peaking circuit definite purpose circuit breaker (100) is stated to be series between the power supply of intermediate distribution system and shunt peaking circuit；
When the shunt peaking circuit definite purpose circuit breaker (100) is closed a floodgate, control module (200) controls major loop switch (K1) first
Separating brake；After predetermined amount of time, control module (200) control capacitive branch switch (K2) is reclosed, by parallel capacitor group
It is incorporated to inductive load, capacitive branch and inductive load circuit in series are discharged at this time；After predetermined amount of time, control module
(200) finally control major loop switch (K1) is closed, and by parallel capacitor group input coefficient, can minimize major loop
Switch (K1) and capacitive branch closing for (K2) of switch are shoved；When shunt peaking circuit definite purpose circuit breaker (100) separating brake,
Control module (200) controls the first separating brake of major loop switch (K1), disconnects entire shunt peaking circuit；After predetermined amount of time, control
Module (200) controls capacitive branch switch (K2) separating brake again；After predetermined amount of time, control module (200) finally controls major loop
(K1) closure is switched, parallel capacitor group is made to log off, major loop switch (K1) and capacitive branch can be minimized
Switch (K2) cut-offs overvoltage；When separating brake, the actuation time interval of setting is greater than supply voltage half period, to ensure reality
The sequencing cut-off.
2. according to the method described in claim 1, it is characterized by: when switching shunt peaking circuit, the major loop switch
(K1) and the value of the predetermined amount of time of capacitive branch switch (K2) movement is 20ms or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810486232.0A CN108667039B (en) | 2018-05-21 | 2018-05-21 | A kind of special switch and method for shunt peaking circuit switching |
Applications Claiming Priority (1)
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| CN111610438A (en) * | 2020-04-20 | 2020-09-01 | 中国电力科学研究院有限公司 | Method and system for evaluating capacitive closing performance of switch equipment with closing resistor |
| CN114002496B (en) * | 2022-01-04 | 2022-03-25 | 成都齐碳科技有限公司 | Compensation capacitance adjusting circuit, compensation capacitance adjusting method and nanopore sequencing circuit |
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| CN101510689A (en) * | 2009-03-30 | 2009-08-19 | 王家强 | Synchronous switch |
| CN202712860U (en) * | 2012-07-25 | 2013-01-30 | 苏州冠新能源科技有限公司 | Reactive capacitance power factor compensation device |
| CN106899024A (en) * | 2017-03-10 | 2017-06-27 | 国家电网公司 | A kind of low-voltage controlling device for being applied to low voltage power distribution network |
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| TW563281B (en) * | 2002-04-17 | 2003-11-21 | Hung-Liang Chou | A protection device for the power capacitor and passive power filter |
| CN101510689A (en) * | 2009-03-30 | 2009-08-19 | 王家强 | Synchronous switch |
| CN202712860U (en) * | 2012-07-25 | 2013-01-30 | 苏州冠新能源科技有限公司 | Reactive capacitance power factor compensation device |
| CN106899024A (en) * | 2017-03-10 | 2017-06-27 | 国家电网公司 | A kind of low-voltage controlling device for being applied to low voltage power distribution network |
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