CN107302221A - A kind of simplifying for switched capacitor group is pre-charged simultaneous switching circuit - Google Patents
A kind of simplifying for switched capacitor group is pre-charged simultaneous switching circuit Download PDFInfo
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- CN107302221A CN107302221A CN201610232776.5A CN201610232776A CN107302221A CN 107302221 A CN107302221 A CN 107302221A CN 201610232776 A CN201610232776 A CN 201610232776A CN 107302221 A CN107302221 A CN 107302221A
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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
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
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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
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Abstract
A kind of simplifying for switched capacitor group is pre-charged simultaneous switching circuit, synchro switch is made up of a monopolar synchronous switch and the two poles of the earth synchro switch, only one of which contact configuration pre-charge circuit 5 and position detecting module 4 in the synchro switch of the two poles of the earth, circuit is simple, it is easily installed in middle pressure cabinet, when synchro switch puts into capacitor bank, after one monopolar synchronous switch of closure, it is pre-charged by pre-charge circuit to capacitor bank, it is charged to be closed again the two poles of the earth synchro switch, using the pole synchro switch pattern of separate unit 3, 3 poles of synchro switch produce electric current and not shoved simultaneously, when cutting off capacitor bank, using 3 monopolar synchronous switching modes, 3 contacts of synchro switch are opened in current zero-crossing point, switching frequent intervals can be second level, line voltage and capacitor bank separation when synchro switch is opened.
Description
Technical field
Simplify precharge simultaneous switching circuit the present invention relates to a kind of switched capacitor group, for power network power quality controlling engineering
In, it is possible to achieve cut off during to the quick non-impact current of capacitor bank input and current over-zero, belong to the idle benefit of power system
Repay harmonic technical field of filtering.
Background technology
There are conventional synchronous switch, also referred to as phase-selecting switch or phased switch, also precharge switch in synchro switch technology.Analysis
The advantage and disadvantage of conventional synchronous switch and precharge synchro switch technology in existing synchro switch.
Conventional synchronous switch is that voltage of 3 single-pole switch on switch contact is zero, is also that supply voltage puts into for zero point, does not have
There is rush of current, electric current is zero opening, does not have electric current phenomenon of arc discharge.Element is not further added by advantage main contacts, major loop is simple.
Shortcoming needs 3 independent switch coil drivers, and there is Displacement Feedback loop three contacts, to adjust the switching time,
Tracking closing time reaches the accurate switching moment；Conventional synchronous is switched in the electricity that line voltage is zero input, now line voltage
Buckling rate is 1, and voltage change is fast, to be accurately zero point input in voltage, it is desirable to the operation precision of synchro switch is a height of ±
1ms, even ± 0.5ms；After the two monopolar synchronous switch closed first, capacitor bank produces monophase current, at the 3rd
During monopolar synchronous switch closure, due to there is voltage on capacitor, the 3rd synchro switch contact voltage is that zero point deviates power network
The zero crossing of voltage, it is difficult to find the 3rd synchro switch contact voltage accurately for zero point, causes switching electric current to have and a little impacts；One group
Capacitor works, then puts into another set capacitor, referred to as back-to-back switching mode, and electric current during closure is significantly than independent one group
Put into electric current big.During research and development conventional synchronous switch, many companies devote considerable time, fund, are all not reaching to pre-
The requirement of phase, yields exploitation conventional synchronous switch.
Two conditions of the precharge switch according to preferable switched capacitor：Capacitor is pre-charged to peak value；In peak point switching electricity
Container, electric current is exactly the switching without transient process.Thyristor switchable capacitor (TSC) technology and synchro switch technology are combined,
The condition of preferable switched capacitor is realized, precharge switch is produced, quick, non-impact current switched capacitor is reached.Preliminary filling
The different pre-charge circuit structure types of power technology generation, the accommodation that various structure precharge switch circuits are had nothing in common with each other, respectively
There are advantage and disadvantage, typical patent of invention：" device based on synchronous precharge switch switched capacitor group ", the patent No.：
201210468939.1, the two poles of the earth synchro switch is switched using a monopolar synchronous or 3 monopolar synchronous are switched, 3 are pre-
Charging circuit, 3 feedback circuits, realizes the switching of quick non-impact current, still, and the invention is equally existed
It is difficult all to find the 3rd synchro switch contact electricity accurately every time due to voltage change on capacitor during three monopolar synchronous switch closures
Press as zero point, cause switching electric current to have once in a while and a little impact, while pre-charge circuit is excessive, it is complicated, there is precharge electricity
Road, capacitor bank has pre-charge voltage when synchro switch is opened, and capacitor bank does not have electric network source separation.Utility model patent：
" a kind of 2 controls 3 of switched capacitor group simplify precharge simultaneous switching circuit ", the patent No.：201520433809.3, than invention
Patent：" a kind of 2 controls 3 of switched capacitor group are pre-charged phased switch circuit ", the patent No.：200910076776.0, have
Great progress, circuit structure is simplified, in two synchro switches K1, K2, only in a synchro switch K2 configuration precharge
Circuit, another synchro switch K1 does not configure pre-charge circuit, and pre-charge circuit is reduced to one by two, and quick action does not have
Have a rush of current, the voltage of switch contact is low during switch excision, be not above 3 times of line voltage, two synchro switches it is dynamic
Work is acted respectively, there is a strict phase sequence, and shortcoming circuit form is to have saved a switch in 23 types of control, three-phase circuit to touch
Point so that the voltage of switch contact is still high, is line voltage, easily produces phenomenon of restriking in medium voltage network work, is not suitable for
Medium voltage network works.Patent of invention：" Intelligent Reactive Compensation Equipment switched based on separate unit tri-level sync ", the patent No.：
201210066279 and patent of invention：" Intelligent Reactive Compensation Equipment switched based on separate unit tri-level sync ", the patent No.：
201210097550.0, using recharge technique, separate unit triple-pole switch is realized in star circuit and delta network without electricity
The switched capacitor of impact is flowed, patent is using two pre-charge circuits, and pre-charge circuit is when separate unit triple-pole switch is opened to electric capacity
Device group is pre-charged, and some engineering applications are then generated special, it is necessary to capacitor is separated with line voltage when synchro switch is opened
Sharp application documents：" pole of the separate unit three precharge synchro switch compensation device with auxiliary switch contact " patent No.：
201620110070.7, the patent increases an auxiliary contact in two preliminary filling electrical circuits, realizes separate unit triple-pole switch opening
When, the separation of capacitor bank and line voltage.Capacitor bank no longer carries direct current.Have the disadvantage that circuit has two precharge
Circuit and an auxiliary switch, require to undertake the voltage of major loop, conventional middle-placed switch cabinet (KN28 cabinets) when auxiliary switch is opened
Or be all the contactor for breaker or three poles for only installing three pole in ring main unit, if being further added by a monopole auxiliary switch,
Need to redesign existing cabinet, work difficulty is very big.
The development of comprehensive analysis conventional synchronous switch on-off capacitor bank and existing various precharge switch switched capacitor technologies,
It was found that the combination of thyristor switchable capacitor (TSC) and synchro switch switched capacitor produces precharge synchro switch switching capacitance
Device, the combination of conventional synchronous switch on-off capacitor and precharge switch switched capacitor produces separate unit tri-level sync precharge switch
Switched capacitor.
The present invention combines the precharge synchro switch and the pole of separate unit 3 precharge synchro switch of 3 monopoles, produces a kind of switching electricity
Simplifying for container group is pre-charged simultaneous switching circuit, and it is only with the synchro switch of three pole, without auxiliary contact, using precharge
Technology, only with a pre-charge circuit, only with a position detecting module, circuit structure form is simply easy to project installation.
During switch input capacitor, due to there is a pre-charge circuit, it is possible to achieve the mode of operation of the pole precharge switch of separate unit 3,3
Pole switch is put into simultaneously, and input point when the 3rd single-pole switch without 3 monopole precharge synchro switches is put into is uncertain
Problem, is the mode of operation that 3 monopoles are pre-charged synchro switch during excision capacitor bank, switch contact is cut when electric current is zero
Disconnected, without phenomenon of arc discharge, synchronous precharge switch relies on three poles of itself, and capacitor and electricity are realized after switch contact excision
The separation of network source, while quick acting when can realize synchro switch by being cut to input again.The present invention is a kind of switching
Simplifying for capacitor bank is pre-charged simultaneous switching circuit, and the simpler change to switch cubicle of circuit is fewer, more convenient to carry out, cost
Lower, failure is fewer, more practical reliable.
The content of the invention
A kind of simplifying for switched capacitor group of the present invention is pre-charged simultaneous switching circuit, it is proposed that synchro switch is same by a monopole
K1 and the two poles of the earth synchro switch K2 composition of step switch, the contact K2B configuration precharge electricity in the synchro switch K2 of the two poles of the earth
Road 5, the two poles of the earth synchro switch K2 another contact K2A and monopolar synchronous switch K1 contact does not configure pre-charge circuit, single
Pole synchro switch K1 and the two poles of the earth synchro switch K2 input are terminated on three phase network power supply, and output end is connected with capacitor bank,
The electric capacity of phase where the reactor L capacitors C of capacitor bank connects into Y-connection pattern, the two poles of the earth synchro switch K2 contacts K2A
Discharge coil PT is placed at the two ends of device, and discharge coil PT secondary side is connected to control protection module 2, synchro switch K2 position
Shifting detected by position detecting module 4, control protection module 2 receive from synchronizing voltage detection module 1, position detecting module 4,
Discharge coil PT secondary side and switching order S1 information, it is synchronous in the contact and the two poles of the earth that monopolar synchronous switchs K1 according to sequential
The voltage and voltage change ratio switched on K2 contact is simultaneously zero point and voltage is zero point, controls synchro switch K1, K2 coil
Drive module 3 is exported, driving monopolar synchronous switch K1 coils and the two poles of the earth synchro switch K2 coils, input monopolar synchronous switch K1
With the two poles of the earth synchro switch K2, the switched capacitor group of non-impact current is realized, is zero point in electric current, monopolar synchronous switch K1 is opened
Contact and the two poles of the earth synchro switch K2 contact, realize the cut-out that electric current is zero, the monopolar synchronous switch K1 and the two poles of the earth are synchronous
Switch K2 may be mounted at any three-phase of three-phase circuit, and the monopolar synchronous switch K1 and the two poles of the earth synchro switch K2 is permanent magnetism
The breaker of the vacuum contactor or electromagnetic type of vacuum contactor or permanent-magnet breaker or electromagnetic type, can also be
Magnetodynamic relay,.
Contact K2B two ends are connected in parallel pre-charge circuit 5 in the synchro switch K2 of the two poles of the earth, and pre-charge circuit 5 is by two poles
Pipe D1 and current-limiting resistance R1 are connected in series composition, and diode D1 negative electrode is connected to electric network source, closure monopolar synchronous switch
K1 contact, by pre-charge circuit 5, reaches the effect of the precharge to the capacitor C of capacitor bank, is synchronously opened at the two poles of the earth
Another contact K2A and monopolar synchronous for closing K2 switch K1 contact two ends, do not connect pre-charge circuit, the diode
D1 is high voltage silicon rectifier stack or general-purpose diode, and the current-limiting resistance R1 is high-voltage resistor or conventional resistor.
The reactor L capacitors C of described capacitor bank can be triangle linked vector graph or Y-connection pattern.
Monopolar synchronous switch K1 is arranged on the other two-phase that a phase of three phase mains, the two poles of the earth synchro switch K2 are arranged on three phase mains,
When described control protection module 2 is connected to fling-cut switch S1 input command jobs, closure monopolar synchronous switchs K1 contact, closes
At the time of closing monopolar synchronous switch K1 contacts, diode D1 subjects back-pressure, when diode bears malleation, is opened by synchronous
K1 contact and pre-charge circuit 5 is closed, to the corresponding two-phase capacitor precharge of the capacitor bank of star structure type, several weeks
After ripple, correspondence two-phase capacitor is pre-charged to the peak value of grid line voltage, the two poles of the earth synchro switch K2 another contact K2A and series connection
The reactor of connection, capacitor this phase branch road, due to not configuring pre-charge circuit, capacitor is not pre-charged, the electricity of capacitor
Pressure is zero, and at the two poles of the earth, synchro switch K2 contact K2A voltage is zero point and voltage change ratio was 1 moment, and closure the two poles of the earth are synchronous
K2 is switched, the input that completing capacitor bank does not have rush of current is acted, and described control protection module 2 is connected to change-over switch S1
Cease and desist order stopping when, when it is -1 that the phase current of phase where synchro switch K1 contact, which is zero-sum current changing rate, open single
Pole synchro switch K1 contact, the electric current of phase is zero where the two poles of the earth synchro switch K2 configures the contact K2B of pre-charge circuit 5
The two poles of the earth synchro switch K2 contact is opened when with current changing rate being 1, the switching action of a capacitor bank, control protection is completed
Module 2 obtains the two poles of the earth synchro switch K2 of position detecting module 4 switching positional information, adjusts the two poles of the earth synchro switch K2 throwing
Cut the time, the error that amendment the two poles of the earth synchro switch K2 long-term actions occur, make throwing tangent point tracing preferable switching moment, monopolar synchronous
Switch after K1 and the two poles of the earth synchro switch K2 openings, capacitor bank and line voltage disconnect, electric current is that zero moment opens monopolar synchronous
The crest voltage that the capacitor C2 in K1 and the two poles of the earth synchro switch K2, capacitor bank has the power network phase voltage of direct current is switched, and
Join discharge coil PT capacitor, be zero by discharge coil repid discharge, be that input is prepared again, without parallel discharge
The capacitor of coil passes through the conductive discharge in capacitor.
Synchro switch switchs K1 and monopolar synchronous switch K2 by a monopolar synchronous and a monopolar synchronous switch K3 is constituted
, monopolar synchronous switch K3 contact configuration pre-charge circuit 5, monopolar synchronous switch K1 contact and monopolar synchronous switch K2
Contact do not configure pre-charge circuit, monopolar synchronous switch K1 and monopolar synchronous switch K2 switch K3 input with monopolar synchronous
It is connected on three phase network power supply, output end is connected with capacitor bank, the reactor L capacitors C of capacitor bank connects into star company
Direct type formula, discharge coil PT is placed at the two ends of the capacitor of phase where monopolar synchronous switch K2 contacts, and discharge coil PT's is secondary
Side is connected to control protection module 2, and synchro switch K2 displacement is detected by position detecting module 4, and control protection module 2 receives
Information from synchronizing voltage detection module 1, position detecting module 4, discharge coil PT secondary side and switching order S1, is pressed
According to sequential K1 contact and monopolar synchronous switch K2 contact and the voltage and electricity on monopolar synchronous switch K3 are switched in monopolar synchronous
Buckling rate is zero point simultaneously and voltage is zero point, and control synchro switch K1, K2, K3 coil drive module 3 is exported, and driving is single
Pole synchro switch K1 coils and monopolar synchronous switch K2 coils switch K3 coils, input monopolar synchronous switch K1 with monopolar synchronous
K3 is switched with monopolar synchronous with monopolar synchronous switch K2, the switched capacitor group of non-impact current is realized, is zero point in electric current,
Open monopolar synchronous switch K1 contact and monopolar synchronous switch K2 contact switchs K3 contact with monopolar synchronous, realize electric current
The cut-out for being zero, the monopolar synchronous switch K1 and monopolar synchronous switch K2 and monopolar synchronous switch K3 may be mounted at three-phase
Any three-phase of circuit, the monopolar synchronous switch K1 and monopolar synchronous switch K2 and monopolar synchronous switch K3 connect for permanent magnet vacuum
The breaker of the vacuum contactor or electromagnetic type of tentaculum or permanent-magnet breaker or electromagnetic type, can also be magneto
Relay.
The contact K2B two ends for switching K2 in monopolar synchronous are connected in parallel pre-charge circuit 5, and pre-charge circuit 5 is by diode D1
Composition is connected in series with current-limiting resistance R1, diode D1 negative electrode is connected to electric network source, and closure monopolar synchronous switch K1's touches
Point, by pre-charge circuit 5, reaches the effect of the precharge to the capacitor C of capacitor bank, switchs K1's in monopolar synchronous
Contact K2A and monopolar synchronous switch K2 contact two ends, do not connect pre-charge circuit, and the diode D1 is high voltage silicon rectifier stack
Or general-purpose diode, the current-limiting resistance R1 is high-voltage resistor or conventional resistor.
The reactor L capacitors C of described capacitor bank can be triangle linked vector graph or Y-connection pattern.
It can change in the switch element front and back position of series circuit, principle is constant, and a monopolar synchronous switchs K1 and one
The two poles of the earth synchro switch K2 constitutes the contact K2B configuration pre-charge circuits 5 in three-phase Zero-point switch, the two poles of the earth synchro switch K2,
The two poles of the earth synchro switch K2 another contact K2A and monopolar synchronous switch K1 contact does not configure pre-charge circuit, monopolar synchronous
Switch K1 and the two poles of the earth synchro switch K2 output end links together, and monopolar synchronous switch K1's and the two poles of the earth synchro switch K2 is defeated
Enter end to be connected with capacitor bank, the reactor L capacitors C of capacitor bank connects into Y-connection pattern, and capacitor bank passes through height
Pressure fuse is connected with three phase network power supply, and discharge lines are placed at the two ends of the capacitor of phase where the K2A of the two poles of the earth synchro switch K2 contacts
PT is enclosed, discharge coil PT secondary side is connected to control protection module 2, and synchro switch K2 displacement is by position detecting module 4
Detection, control protection module 2 receive from synchronizing voltage detection module 1, position detecting module 4, discharge coil PT it is secondary
Side and switching order S1 information, are switched according to sequential in monopolar synchronous on K1 contact and the two poles of the earth synchro switch K2 contact
Voltage and voltage change ratio are simultaneously zero point and voltage is zero point, and control synchro switch K1, K2 coil drive module 3 is exported, and is driven
Dynamic monopolar synchronous switch K1 coils and the two poles of the earth synchro switch K2 coils, input monopolar synchronous switch K1 and the two poles of the earth synchro switch K2,
The switched capacitor group of non-impact current is realized, is zero point in electric current, the contact and the two poles of the earth for opening monopolar synchronous switch K1 are synchronously opened
K2 contact is closed, the cut-out that electric current is zero is realized, the monopolar synchronous switch K1 and the two poles of the earth synchro switch K2 may be mounted at
Any three-phase of three-phase circuit, the monopolar synchronous switch K1 and the two poles of the earth synchro switch K2 is permanent magnet vacuum contactor or permanent magnetism
The breaker of the vacuum contactor or electromagnetic type of breaker or electromagnetic type, can also be magnetodynamic relay.
The advantageous effects of the present invention：
The design that the present invention is combined using 3 monopole precharge synchro switches and the pole of separate unit 3 precharge synchro switch so that circuit
Structure design is simple, 3 pole switches in three phase mains, is designed as a monopolar synchronous switch and the two poles of the earth synchro switch, adopts
With a pre-charge circuit and a position detecting module, it is easily installed in middle-placed switch cabinet (KN28 cabinets) and ring main unit, by
In there is a pre-charge circuit, capacitor bank can realize that the pole of separate unit 3 is pre-charged the operational mode of synchro switch, separate unit when putting into
3 poles switch is that 3 poles of switch are acted simultaneously, eliminates the difficulty that the triple-pole switch closing of contact moment is difficult to find accurately, electric capacity
Device group can realize the operational mode of 3 monopolar synchronous switch when cutting off, 3 monopolar synchronous switch each pole can with single movement,
So that each switch contact is opened at the electric current null moment, and without phenomenon of arc discharge, due to adding a discharge coil PT,
Capacitor can be quickly recovered to the reset condition requirement put into again, be realized capacitor bank from being cut to again with repid discharge
The quick acting requirement of input, electric network source and capacitor bank when realizing synchro switch cut-out by 3 poles of three-phase circuit
Separation, it is no longer necessary to the extra increase auxiliary contact in preliminary filling electrical circuit.
Brief description of the drawings
Fig. 1：The circuit diagram of one single-pole switch and a two-photo pole switch switching star capacitor bank
Fig. 2：The circuit diagram of one single-pole switch and a two-photo pole switch switching triangle capacitor bank
Fig. 3：The circuit diagram of three single-pole switch switching star capacitor banks
Fig. 4：The circuit diagram of three single-pole switch switching triangle capacitor banks
Fig. 5：One single-pole switch and a two-photo pole switch constitute the circuit diagram of star Zero-point switch switching star capacitor bank
Embodiment
It is see Fig. 1：A kind of one embodiment circuit diagram for simplifying precharge simultaneous switching circuit of switched capacitor group.
Described synchro switch switchs K1 and the two poles of the earth synchro switch K2 by a monopolar synchronous and constituted, and the two poles of the earth are synchronously opened
Close the contact K2B configuration pre-charge circuits 5 in K2, the two poles of the earth synchro switch K2 another contact K2A and monopolar synchronous
Switch K1 contact does not configure pre-charge circuit, and monopolar synchronous switch K1 and the two poles of the earth synchro switch K2 input terminate at three-phase
On 10kV electric network sources, output end is connected with capacitor bank, and the reactor L capacitors C of capacitor bank connects into Y-connection type
Discharge coil PT is placed at the two ends of the capacitor of phase where formula, the two poles of the earth synchro switch K2 contacts K2A, and discharge coil PT's is secondary
Side is connected to control protection module 2, and synchro switch K2 displacement is detected by position detecting module 4, and control protection module 2 receives
Information from synchronizing voltage detection module 1, position detecting module 4, discharge coil PT secondary side and switching order S1, is pressed
According to sequential monopolar synchronous switch K1 contact and the two poles of the earth synchro switch K2 contact on voltage and voltage change ratio simultaneously be zero
Point is zero point with voltage, and control synchro switch K1, K2 coil drive module 3 is exported, driving monopolar synchronous switch K1 coils and
The two poles of the earth synchro switch K2 coils, input monopolar synchronous switch K1 and the two poles of the earth synchro switch K2, realize the switching electricity of non-impact current
Container group, is zero point in electric current, opens monopolar synchronous switch K1 contact and the two poles of the earth synchro switch K2 contact, realizes electric current
The cut-out for being zero, the monopolar synchronous switch K1 is arranged on U phases and the two poles of the earth synchro switch K2 K2A contacts are arranged on V phases,
The two poles of the earth synchro switch K2 K2B contacts are arranged on W phases, and the monopolar synchronous switch K1 and the two poles of the earth synchro switch K2 is that permanent magnetism is true
The vacuum contactor or the breaker of electromagnetic type of empty contactor or permanent-magnet breaker or electromagnetic type, can also be forever
Electromagnetic relay,.
The described contact K2B two ends in the synchro switch K2 of the two poles of the earth are connected in parallel pre-charge circuit 5, pre-charge circuit 5
It is connected in series and is constituted by diode D1 and current-limiting resistance R1, diode D1 negative electrode is connected to electric network source, closes monopolar synchronous
K1 contact is switched, by pre-charge circuit 5, the effect of the precharge to the capacitor C of capacitor bank is reached, it is same at the two poles of the earth
Step switch K2 another contact K2A and monopolar synchronous switch K1 contact two ends, do not connect pre-charge circuit, described two
Pole pipe D1 is high voltage silicon rectifier stack, and high voltage silicon rectifier stack D1 voltages are 60kV, and electric current 1A, the current-limiting resistance R1 are high-voltage resistor,
High-voltage resistor R1 is 12kV, 10K ohm, 500W.
According to the principle in the principles of electric and electronic engineering on star circuit and delta network equivalent transformation, by three-phase reactor L and capacitor
The filter condenser group of C compositions can connect into star circuit form, can also connect into delta network form, reactor L
With capacitor C no matter using the achievable identical switching effect of which kind of type of attachment.Fig. 2 shows one according to the present invention
The circuit diagram of another embodiment of single-pole switch and a two-photo pole switch switching triangle capacitor bank, wherein capacitor bank are triangle
Shape linked vector graph.
Described monopolar synchronous switch K1 is arranged on the U phases of three phase mains, the two poles of the earth synchro switch K2 and is arranged on the another of three phase mains
Outer V phases and W phases, when described control protection module 2 is connected to fling-cut switch S1 input command jobs, closure monopolar synchronous switch
K1 contact, at the time of closure monopolar synchronous switch K1 contacts, diode D1 subjects back-pressure, when diode bears malleation,
Contact and pre-charge circuit 5 by synchro switch K1, corresponding capacitor C1 and electric capacity to the capacitor bank of star structure type
Device C3 is pre-charged, after several cycles, and correspondence capacitor C1 and capacitor C3 is pre-charged to the peak value of grid line voltage, the two poles of the earth
Synchro switch K2 another contact K2A and the reactor L2, the capacitor C2 that are connected in series are arranged on V phases, due to not configuring pre-
Charging circuit, capacitor C2 is not pre-charged, and capacitor C2 voltage is zero, the synchro switch K2 contact K2A at the two poles of the earth
Phase voltage Uv is zero point and voltage change ratio was 1 moment, closes the two poles of the earth synchro switch K2, and completing capacitor bank does not have electric current punching
Hit input action, described control protection module 2 be connected to change-over switch S1 cease and desist order stopping when, synchro switch K1's
The phase current Ia of phase where contact is zero-sum current changing rate when being -1, opens the contact that monopolar synchronous switchs K1, same at the two poles of the earth
The electric current Ic of phase is that zero-sum current changing rate opens the two poles of the earth when being 1 where the contact K2B of step switch K2 configuration pre-charge circuits 5
Synchro switch K2 contact, completes the switching action of a capacitor bank, and control protection module 2 obtains position detecting module 4
The two poles of the earth synchro switch K2 switching positional information, adjusts the two poles of the earth synchro switch K2 switching time, corrects the two poles of the earth synchro switch K2
The error that long-term action occurs, makes synchro switch K2 throwing tangent point tracing preferable switching moment, monopolar synchronous switch K1 and the two poles of the earth
After synchro switch K2 is opened, capacitor bank and line voltage disconnect, and electric current is that zero moment opens monopolar synchronous switch K1 and the two poles of the earth
The crest voltage for the power network phase voltage that capacitor C2 in synchro switch K2, capacitor bank is present, the parallel connection of capacitor C2 two ends
Discharge coil PT, is zero by discharge coil repid discharge, is that input is prepared again, the electricity without parallel discharge coil PT
Container C1 and capacitor C2 pass through the conductive discharge in capacitor.
Fig. 3 is the circuit diagram of three single-pole switch switching star capacitor banks
Described synchro switch is to switch K1 and monopolar synchronous by a monopolar synchronous to switch K2 and monopolar synchronous switch
K3 compositions, monopolar synchronous switch K3 contact configuration pre-charge circuit 5, monopolar synchronous switchs K1 contact and monopolar synchronous
Switch K2 contact does not configure pre-charge circuit, and monopolar synchronous switch K1 and monopolar synchronous switch K2 switch K3 with monopolar synchronous
Input terminate on three-phase 10kV electric network sources, output end is connected with capacitor bank, the reactor L capacitors C of capacitor bank
Y-connection pattern is connected into, discharge coil PT is placed at the capacitor C2 of phase two ends where monopolar synchronous switch K2 contacts, is put
Electric coil PT secondary side, which is connected to, controls the synchro switch K2 of protection module 2 displacement to be detected by position detecting module 4, control
Protection module 2 receives to order from synchronizing voltage detection module 1, position detecting module 4, discharge coil PT secondary side and switching
S1 information is made, K1 contact is switched in monopolar synchronous according to sequential and monopolar synchronous switchs K2 contact and monopolar synchronous is switched
Voltage and voltage change ratio on K3 are simultaneously zero point and voltage is zero point, control synchro switch K1, K2, K3 coil drive mould
Block 3 is exported, and driving monopolar synchronous switch K1 coils and monopolar synchronous switch K2 coils switch K3 coils, input with monopolar synchronous
Monopolar synchronous switchs K1 and monopolar synchronous switch K2 switchs K3 with monopolar synchronous, realizes the switched capacitor group of non-impact current,
It is zero point in electric current, opens monopolar synchronous switch K1 contact and monopolar synchronous switch K2 contact switchs K3's with monopolar synchronous
Contact, realizes the cut-out that electric current is zero, the monopolar synchronous switch K1 is arranged on U phases and monopolar synchronous switch K2 is arranged on V
W phases are arranged on monopolar synchronous switch K3, the monopolar synchronous switch K1 and monopolar synchronous switch K2 are switched with monopolar synchronous
K3 is the breaker of permanent magnet vacuum contactor or the vacuum contactor or electromagnetic type of permanent-magnet breaker or electromagnetic type,
It can also be magnetodynamic relay.
The described contact K2B two ends for switching K2 in monopolar synchronous are connected in parallel pre-charge circuit 5, and pre-charge circuit 5 is by two
Pole pipe D1 and current-limiting resistance R1 are connected in series composition, and diode D1 negative electrode is connected to electric network source, closure monopolar synchronous switch
K1 contact, by pre-charge circuit 5, reaches the effect of the precharge to the capacitor C1 and capacitor C3 of capacitor bank,
The contact K2A and monopolar synchronous for switching K1 in monopolar synchronous switch K2 contact two ends, do not connect pre-charge circuit, described
Diode D1 is high voltage silicon rectifier stack, and the current-limiting resistance R1 is high-voltage resistor.
According to the principle in the principles of electric and electronic engineering on star circuit and delta network equivalent transformation, by three-phase reactor L and capacitor
The filter condenser group of C compositions can connect into star circuit form, can also connect into delta network form, reactor L
With capacitor C no matter using the achievable identical switching effect of which kind of type of attachment.Fig. 2 shows three according to the present invention
The circuit diagram of another embodiment of single-pole switch switching triangle capacitor bank, wherein capacitor bank are triangle linked vector graph.
Further embodiment is Fig. 5：One single-pole switch and a two-photo pole switch composition star Zero-point switch switching star capacitor
The circuit diagram of group
The described switch element front and back position in series circuit can change, and principle is constant, and a monopolar synchronous switchs K1
The contact K2B configuration precharge in three-phase Zero-point switch, the two poles of the earth synchro switch K2 is constituted with the two poles of the earth synchro switch K2
Circuit 5, the two poles of the earth synchro switch K2 another contact K2A and monopolar synchronous switch K1 contact does not configure pre-charge circuit,
Monopolar synchronous switch K1 and the two poles of the earth synchro switch K2 output end links together, monopolar synchronous switch K1 and the two poles of the earth synchro switch
K2 input is connected with capacitor bank, and the reactor L capacitors C of capacitor bank connects into Y-connection pattern, capacitor bank
It is connected by high-tension fuse with three phase network power supply, the two ends of the capacitor of V phases are put where the K2A of the two poles of the earth synchro switch K2 contacts
Electric coil PT is put, discharge coil PT secondary side is connected to control protection module 2, and synchro switch K2 displacement is examined by position
Survey module 4 to detect, control protection module 2 receives to come from synchronizing voltage detection module 1, position detecting module 4, discharge coil
PT secondary side and switching order S1 information, K1 contact and the two poles of the earth synchro switch K2 is switched according to sequential in monopolar synchronous
Contact on voltage and voltage change ratio is simultaneously zero point and voltage is zero point, control synchro switch K1, K2 coil drive module
3 outputs, driving monopolar synchronous switch K1 coils and the two poles of the earth synchro switch K2 coils, input monopolar synchronous switch K1 and the two poles of the earth are same
Step switch K2, realizes the switched capacitor group of non-impact current, is zero point in electric current, opens the contact that monopolar synchronous switchs K1
With the two poles of the earth synchro switch K2 contact, the cut-out that electric current is zero is realized, the monopolar synchronous switchs K1 and the two poles of the earth synchro switch K2
Any three-phase of three-phase circuit is may be mounted at, the monopolar synchronous switch K1 and the two poles of the earth synchro switch K2 contacts for permanent magnet vacuum
The breaker of the vacuum contactor or electromagnetic type of device or permanent-magnet breaker or electromagnetic type, can also be magneto after
Electrical equipment.
The particular embodiment of the present invention has made detailed explanation to present disclosure, for persons skilled in the art,
Without departing from the premise in the spirit of the present invention to any obvious change that it is done, all constitute and patent right of the present invention is invaded
Violate, corresponding legal liabilities will be undertaken.
Claims (8)
1. a kind of simplifying for switched capacitor group is pre-charged simultaneous switching circuit, it is characterised in that：Synchro switch is by a list
What pole synchro switch K1 and the two poles of the earth synchro switch K2 were constituted, a contact K2B in the synchro switch K2 of the two poles of the earth
Pre-charge circuit 5 is configured, the two poles of the earth synchro switch K2 another contact K2A and monopolar synchronous switch K1 contact is not
Pre-charge circuit is configured, monopolar synchronous switch K1 and the two poles of the earth synchro switch K2 input terminate at three phase network power supply
On, output end is connected with capacitor bank, and the reactor L capacitors C of capacitor bank connects into Y-connection pattern,
Discharge coil PT is placed at the two ends of the capacitor of phase where the K2A of the two poles of the earth synchro switch K2 contacts, discharge coil PT's
Secondary side is connected to control protection module 2, and synchro switch K2 displacement is detected that control is protected by position detecting module 4
Shield module 2 receive from synchronizing voltage detection module 1, position detecting module 4, discharge coil PT secondary side and
Switching order S1 information, synchro switch K2 displacement is detected by position detecting module 4, according to sequential in monopole
Synchro switch K1 contact and voltage and voltage change ratio on the two poles of the earth synchro switch K2 contact simultaneously for zero point with
Voltage is zero point, and control synchro switch K1, K2 coil drive module 3 is exported, driving monopolar synchronous switch K1 lines
Circle and the two poles of the earth synchro switch K2 coils, input monopolar synchronous switch K1 and the two poles of the earth synchro switch K2, are realized without impact
The switched capacitor group of electric current, is zero point in electric current, opens monopolar synchronous switch K1 contact and the two poles of the earth synchro switch
K2 contact, realizes the cut-out that electric current is zero, and the monopolar synchronous switch K1 and the two poles of the earth synchro switch K2 can pacify
Mounted in any three-phase of three-phase circuit, the monopolar synchronous switch K1 and the two poles of the earth synchro switch K2 connects for permanent magnet vacuum
The breaker of the vacuum contactor or electromagnetic type of tentaculum or permanent-magnet breaker or electromagnetic type, can be with
It is magnetodynamic relay.
2. a kind of simplifying for switched capacitor group according to claim 1 is pre-charged simultaneous switching circuit, it is characterised in that：
Contact K2B two ends are connected in parallel pre-charge circuit 5 in the synchro switch K2 of the two poles of the earth, pre-charge circuit 5 by
Diode D1 and current-limiting resistance R1 are connected in series composition, and diode D1 negative electrode is connected to electric network source, and closure is single
Pole synchro switch K1 contact, by pre-charge circuit 5, reaches the precharge to the capacitor C of capacitor bank
Effect, at the two poles of the earth, synchro switch K2 another contact K2A and monopolar synchronous switch K1 contact two ends, do not have
Pre-charge circuit is connected, the diode D1 is high voltage silicon rectifier stack or general-purpose diode, and the current-limiting resistance R1 is
High-voltage resistor or conventional resistor.
3. a kind of simplifying for switched capacitor group according to claim 1 is pre-charged simultaneous switching circuit, it is characterised in that：
The reactor L capacitors C of described capacitor bank can be triangle linked vector graph or Y-connection type
Formula.
4. the simplifying for a kind of switched capacitor group according to any one of claim 1-3 is pre-charged simultaneous switching circuit,
It is characterized in that：Monopolar synchronous switch K1 is arranged on a phase of three phase mains, the two poles of the earth synchro switch K2 and is arranged on three
The other two-phase of phase power supply, when described control protection module 2 is connected to fling-cut switch S1 input command jobs, closure
Monopolar synchronous switchs K1 contact, and at the time of closure monopolar synchronous switch K1 contacts, diode D1 subjects back-pressure,
When diode bears malleation, contact and pre-charge circuit 5 by synchro switch K1, the electricity to star structure type
After the corresponding two-phase capacitor precharge of container group, several cycles, correspondence two-phase capacitor is pre-charged to grid line
The peak value of voltage, the two poles of the earth synchro switch K2 another contact K2A and the reactor being connected in series, capacitor this phase branch
Road, due to not configuring pre-charge circuit, capacitor is not pre-charged, and the voltage of capacitor is zero, synchronous at the two poles of the earth
The voltage for switching K2 contact K2A is zero point and voltage change ratio was 1 moment, closes the two poles of the earth synchro switch K2, complete
The input for not having rush of current into capacitor bank is acted, and described control protection module 2 is connected to change-over switch S1 stoppings
When order stops, when it is -1 that the phase current of phase where synchro switch K1 contact, which is zero-sum current changing rate, opening
Monopolar synchronous switchs K1 contact, the phase where the two poles of the earth synchro switch K2 configures the contact K2B of pre-charge circuit 5
Electric current be the contact that the two poles of the earth synchro switch K2 is opened when zero-sum current changing rate is 1, complete capacitor bank
Switching is acted, and control protection module 2 obtains the two poles of the earth synchro switch K2 of position detecting module 4 switching positional information,
The two poles of the earth synchro switch K2 switching time is adjusted, the error that amendment the two poles of the earth synchro switch K2 long-term actions occur makes
Throw tangent point tracing preferable switching moment, after monopolar synchronous switch K1 and the two poles of the earth synchro switch K2 is opened, capacitor bank
Disconnected with line voltage, electric current is that zero moment opens monopolar synchronous switch K1 and the two poles of the earth synchro switch K2, capacitor bank
In capacitor exist direct current power network phase voltage crest voltage, capacitor two ends it is in parallel discharge coil PT, lead to
Overdischarge coil repid discharge is zero, is that input is prepared again, the capacitor without parallel discharge coil passes through electricity
Conductive discharge in container.
5. a kind of simplifying for switched capacitor group is pre-charged simultaneous switching circuit, it is characterised in that：Synchro switch is by a list
Pole synchro switch K1 and a monopolar synchronous switch what K2 and monopolar synchronous switch K3 was constituted, and monopolar synchronous is opened
K3 contact configuration pre-charge circuit 5 is closed, monopolar synchronous switch K1 contact and monopolar synchronous switch K2 contact
Pre-charge circuit is not configured, monopolar synchronous switch K1 and monopolar synchronous switch K2 switch K3 input with monopolar synchronous
Terminate on three phase network power supply, output end is connected with capacitor bank, the reactor L capacitors C of capacitor bank connects
Y-connection pattern is connected into, discharge coil PT is placed at the two ends of the capacitor of phase where monopolar synchronous switch K2 contacts,
Discharge coil PT secondary side is connected to control protection module 2, synchro switch K2 and synchro switch K3 displacement by
Position detecting module 4 detects that control protection module 2 receives to come from synchronizing voltage detection module 1, position detecting module
4th, discharge coil PT secondary side and switching order S1 information, touching for K1 is switched according to sequential in monopolar synchronous
The voltage and voltage change ratio that point and monopolar synchronous switch K2 contact are switched with monopolar synchronous on K3 are simultaneously zero point
It is zero point with voltage, control synchro switch K1, K2, K3 coil drive module 3 is exported, driving monopolar synchronous switch
K1 coils and monopolar synchronous switch K2 coils switch K3 coils, input monopolar synchronous switch K1 and list with monopolar synchronous
Pole synchro switch K2 switchs K3 with monopolar synchronous, realizes the switched capacitor group of non-impact current, is zero point in electric current,
Open monopolar synchronous switch K1 contact and monopolar synchronous switch K2 contact switch K3 contact with monopolar synchronous,
The cut-out that electric current is zero is realized, the monopolar synchronous switch K1 and monopolar synchronous switch K2 switch K3 with monopolar synchronous
It may be mounted at any three-phase of three-phase circuit, the monopolar synchronous switch K1 and monopolar synchronous switch K2 and monopole
Synchro switch K3 be permanent magnet vacuum contactor or permanent-magnet breaker or electromagnetic type vacuum contactor or
The breaker of electromagnetic type, can also be magnetodynamic relay.
6. a kind of simplifying for switched capacitor group according to claim 5 is pre-charged simultaneous switching circuit, it is characterised in that：
The contact K2B two ends for switching K2 in monopolar synchronous are connected in parallel pre-charge circuit 5, and pre-charge circuit 5 is by two poles
Pipe D1 and current-limiting resistance R1 are connected in series composition, and diode D1 negative electrode is connected to electric network source, and closure monopole is same
Step switch K1 contact, by pre-charge circuit 5, reaches the effect of the precharge to the capacitor C of capacitor bank,
The contact K2A and monopolar synchronous for switching K1 in monopolar synchronous switch K2 contact two ends, do not connect precharge electricity
Road, the diode D1 be high voltage silicon rectifier stack or general-purpose diode, the current-limiting resistance R1 be high-voltage resistor or
Person's conventional resistor.
7. a kind of simplifying for switched capacitor group according to claim 5 is pre-charged simultaneous switching circuit, it is characterised in that：
The reactor L capacitors C of described capacitor bank can be triangle linked vector graph or Y-connection type
Formula.
8. a kind of simplifying for switched capacitor group is pre-charged simultaneous switching circuit, it is characterised in that：In the switch member of series circuit
Part front and back position can change, and principle is constant, and a monopolar synchronous switchs K1 and the two poles of the earth synchro switch K2
The contact K2B configuration pre-charge circuits 5 in three-phase Zero-point switch, the two poles of the earth synchro switch K2 are constituted, the two poles of the earth are same
Step switch K2 another contact K2A and monopolar synchronous switch K1 contact do not configure pre-charge circuit, and monopole is same
Step switch K1 and the two poles of the earth synchro switch K2 output end is linked together, and monopolar synchronous switch K1 and the two poles of the earth are synchronously opened
The input for closing K2 is connected with capacitor bank, and the reactor L capacitors C of capacitor bank connects into Y-connection pattern,
Capacitor bank is connected by high-tension fuse with three phase network power supply, phase where the K2A of the two poles of the earth synchro switch K2 contacts
Discharge coil PT is placed at the two ends of capacitor, and discharge coil PT secondary side is connected to control protection module 2, synchronous
Switch K2 displacement is detected that control protection module 2 receives to come from synchronizing voltage detection module by position detecting module 4
1st, the information of position detecting module 4, discharge coil PT secondary side and switching order S1, according to sequential in monopole
Synchro switch K1 contact and voltage and voltage change ratio on the two poles of the earth synchro switch K2 contact simultaneously for zero point with
Voltage is zero point, and control synchro switch K1, K2 coil drive module 3 is exported, driving monopolar synchronous switch K1 lines
Circle and the two poles of the earth synchro switch K2 coils, input monopolar synchronous switch K1 and the two poles of the earth synchro switch K2, are realized without impact
The switched capacitor group of electric current, is zero point in electric current, opens monopolar synchronous switch K1 contact and the two poles of the earth synchro switch
K2 contact, realizes the cut-out that electric current is zero, and the monopolar synchronous switch K1 and the two poles of the earth synchro switch K2 can pacify
Mounted in any three-phase of three-phase circuit, the monopolar synchronous switch K1 and the two poles of the earth synchro switch K2 connects for permanent magnet vacuum
The breaker of the vacuum contactor or electromagnetic type of tentaculum or permanent-magnet breaker or electromagnetic type, can be with
It is magnetodynamic relay.
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| CN201610232776.5A CN107302221A (en) | 2016-04-14 | 2016-04-14 | A kind of simplifying for switched capacitor group is pre-charged simultaneous switching circuit |
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| CN201610232776.5A CN107302221A (en) | 2016-04-14 | 2016-04-14 | A kind of simplifying for switched capacitor group is pre-charged simultaneous switching circuit |
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Cited By (1)
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| CN111029184A (en) * | 2019-12-16 | 2020-04-17 | 广东瑞德智能科技股份有限公司 | Switch device, baking device with switch device and household appliance |
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