CN106057566A - Novel compound switch for high-voltage capacitor switching and working method of novel compound switch - Google Patents

Novel compound switch for high-voltage capacitor switching and working method of novel compound switch Download PDF

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Publication number
CN106057566A
CN106057566A CN201610467314.1A CN201610467314A CN106057566A CN 106057566 A CN106057566 A CN 106057566A CN 201610467314 A CN201610467314 A CN 201610467314A CN 106057566 A CN106057566 A CN 106057566A
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switch
phase
control system
voltage
auxiliary
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CN106057566B (en
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徐东晟
邱志人
雷志鹏
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State Grid Corp of China SGCC
Fuzhou Tianyu Electric Co Ltd
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State Grid Corp of China SGCC
Fuzhou Tianyu Electric Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/666—Operating arrangements
    • 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
    • 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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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Keying Circuit Devices (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)

Abstract

The invention relates to a novel compound switch for high-voltage capacitor switching and a working method of the novel compound switch. The compound switch comprises a compound switch control system, diode strings and mechanical switches, wherein each of A and C two phases is provided with two mechanical switches, namely a primary switch and an auxiliary switch; each primary switch is connected with one diode string in parallel; only one auxiliary mechanical switch is arranged on a B phase for playing an isolating role; and the compound switch control system comprises a voltage and current detection circuit, mechanical switch drive circuits, an operating mechanism energy-storage capacitor charging control circuit, a compound switch state display circuit and a digital control system. By the novel compound switch, voltage zero point turn-on and current zero point turn-off of the compound switch can be achieved; switching inrush current and breaking overvoltage in the switching process are eliminated; and non-arc operation of the mechanical switches can also be achieved. Meanwhile, a thyristor string is replaced with the diode strings; and compared with a traditional compound switch, the novel compound switch has the advantages that complicated trigger circuit is not needed and the problem of the damage caused by over-voltage conduction by mistake of a lightning stroke and the like is solved.

Description

A kind of NEW TYPE OF COMPOSITE for high-voltage capacitance switching switchs and method of work
Technical field
The present invention relates to a kind of NEW TYPE OF COMPOSITE for high-voltage capacitance switching switch, belong to high-voltage switch gear field.
Background technology
Along with the fast development of national economy and improving constantly of people's living standard, net capacity and electrical equipment drastically Ground increases.Owing to load and the distribution of power system are different, not only change the electric power-feeding structure of network system, also change Become the power distribution of network system, introduce a large amount of idle components to network system.For Resources for construction economizing type environmental friendliness Type society, improves power network resources utilization rate, improves grid supply quality, network system will be carried out reactive-load compensation.
Switch on-off shnt capacitor is still that in current electric network reactive compensation and uses the widest a kind of mode.This type of technology The greatest drawback existed is exactly switching moment to there is the biggest oscillation and rush of current, it is impossible to carry out the frequent throwing switched Cut.Solving this problem and mainly have two ways, one is to use split-phase synchro switch technology, and two is to use combination switch technology.With Can step switching technique produce a desired effect under various conditions, it is critical only that on/off switch phase accuracy, but owing to being made Making technique and the impact of mechanism kinematic dispersibility, its long-term effect is unsatisfactory.And combination switch is to mechanism kinematic dispersibility Require then can relative loose, and it can utilize original reactive-load compensation equipment completely, and newly added equipment floor space is little, to former Having system to put into relatively low without particular/special requirement, transformation, can realize the zero crossing frequent switching of compensation device, being suitable for large-scale popularization should With.
But, the most conventional combination switch typically uses the topological structure that IGCT parallel manipulator switchs, due to brilliant lock Pipe is the most sensitive to voltage change ratio, it is easy to misleading under the over-voltage condition such as thunderbolt and damage, the most this structure is also Needing the complicated circuit that triggers to ensure the synchronicity of IGBT group, all of these factors taken together reduces compound to a certain extent The reliability of switch and safety, limit it and promote the use of.
Summary of the invention
It is an object of the invention to overcome the problem existing for parallel thyristors string in background technology to provide a kind of double The NEW TYPE OF COMPOSITE switch of mechanical switch parallel diode.This combination switch utilizes diode string to replace IGCT string to undertake dynamically Process, eliminates the hidden danger that IGCT string is brought, the reliability of the combination switch of raising and safety.
For achieving the above object, technical scheme: a kind of NEW TYPE OF COMPOSITE for high-voltage capacitance switching switchs, bag Include combination switch control system, mechanical switch；Described combination switch control system connects mechanical switch；It is characterized in that: described machine Tool switch bag A phase master switch, C phase master switch, A phase auxiliary switch, C phase auxiliary switch, B auxiliary mechanical switch；Described A phase is led Switch one end is electrically connected with A, and the other end is connected with A phase auxiliary switch one end；Another termination load capacitance of A phase auxiliary switch； Described C phase master switch one end is electrically connected with C, and the other end is connected with C phase auxiliary switch one end；Another termination of C phase auxiliary switch Load capacitance；Described B Aided Machine one end is electrically connected with C, and the other end is connected with load capacitance；A phase master switch, C phase are main to be opened Pass, A phase auxiliary switch, C phase auxiliary switch, the control end of B auxiliary mechanical switch are connected with combination switch control system respectively；Institute State A phase auxiliary switch, a C phase auxiliary switch diode string in parallel respectively.
Further, described mechanical switch is vacuum machine switch, and its operating mechanism is permanent-magnet manipulating mechanism or eddy current Repulsive force mechanism.
Further, described master control system includes voltage transformer, current transformer, signal conditioning circuit, numeral Control system, 5 vacuum machine switch combined floodgate drive circuits, 5 vacuum machines switch separating brake drive circuit, 5 vacuum switches The coil of electromagnetic operating mechanism, combination switch status display circuit and the charging of mechanical switch operating mechanism storage capacitor control electricity Road；Described voltage transformer and signal conditioning circuit are for point of zero voltage and the detection of frequency, and pass to numerical control system； Described signal conditioning circuit input voltage transformer respectively, current transformer connect；Signal conditioning circuit output connects digital control System inputs；The output of described numerical control system connects 5 vacuum machine switch combined floodgate drive circuits, 5 vacuum machines respectively and opens Close separating brake drive circuit, combination switch status display circuit and mechanical switch operating mechanism storage capacitor charging control circuit； Described current transformer and signal conditioning circuit are for current zero and the detection of frequency, and pass to numerical control system；Institute State combination switch status display circuit be mainly used in the supervision to combination switch duty and corresponding fault alarm is provided And fault message；Owing to the closing time of electromagnetic operating mechanism of vacuum machine switch and opening time are by the beginning of its storage capacitor Beginning voltage influence, in order to reduce the dispersibility of mechanical switch action, introduces storage capacitor charging control circuit, to ensure energy storage electricity Hold stablizing of initial voltage.
The present invention also provides for a kind of method of work switched based on the above-mentioned NEW TYPE OF COMPOSITE for high-voltage capacitance switching, its Comprising the following steps: S1 closes a floodgate the stage: after receiving reclosing command, numerical control system starts to be charged combined floodgate electric capacity, And the charging interval of combined floodgate electric capacity is detected, judge it is to enter combined floodgate program or enter fault alarm according to the charging interval Program；Enter after combined floodgate program, numerical control system by voltage transformer and signal conditioning circuit to B phase voltage zero crossing and Frequency detects, after voltage over zero being detected, and Guan Bi B auxiliary mechanical switch immediately；Close C phase after delay time t1 to lead Switch, C phase master switch is at tk2.1Reliably close in time；C phase auxiliary switch, C phase auxiliary switch is closed again after delay time t2 At tk2.2Reliably close in time；Closing A phase master switch again after delay time t3, A phase master switch is at tk3.1Reliably close in time Close；Closing A phase auxiliary switch after last delay time t4 again, A phase auxiliary switch is at tk3.2Reliably close in time；S2 separating brake rank Section: after receiving separating brake instruction, numerical control system starts to be charged separating brake electric capacity, and the charging interval to separating brake electric capacity Detect, judge it is to enter separating brake program or enter fault alarm program according to the charging interval；After entering separating brake program, number B phase current zero crossing and frequency are detected, when detecting by word control system by current transformer and signal conditioning circuit After current zero-crossing point, delay time t5, disconnect A phase auxiliary switch, make the load current of A phase branch road transfer to A phase and assist out Closing on diode string in parallel, A phase auxiliary switch is at ttk3.2Disjunction in time；Delay time t6 again, disconnects A phase master switch, A Phase master switch is at ttk3.1Disjunction in time；Delay time t7 again, disconnects C phase auxiliary switch；C phase auxiliary switch is at ttk2.2Time Interior disjunction；Delay time t8 again, disconnects C phase master switch, and C phase master switch is at ttk2.1Disjunction in time；Delay time t9 again, disconnected Open B auxiliary mechanical switch.
Compared to prior art, the method have the advantages that by certain sequencing contro, it is possible to achieve compound The no-voltage of switch is opened and zero-current switching, eliminates the inrush phenomenon during switching and gate-dividing super-voltage, the most all right Realize operating without arc of mechanical switch, improve the electric life of mechanical switch contact；Diode string is used to replace IGCT string, Compared with traditional combination switch, it need not the triggering circuit of complexity, does not the most exist and damages because the overvoltage such as thunderbolt mislead Bad problem, decreases component, simplifies the control of system, improves reliability and the safety of combination switch.
Accompanying drawing explanation
Fig. 1 is the electrical schematic diagram of NEW TYPE OF COMPOSITE switch topology of the present invention (containing partial circumscription circuit).
Fig. 2 is the theory diagram of NEW TYPE OF COMPOSITE on-off control system of the present invention.
Fig. 3 is the control principle drawing in NEW TYPE OF COMPOSITE of the present invention switch combined floodgate stage.
Fig. 4 is the control principle drawing in NEW TYPE OF COMPOSITE of the present invention switch separating brake stage.
Detailed description of the invention
Below in conjunction with the accompanying drawings technical scheme is described further.
A kind of NEW TYPE OF COMPOSITE for high-voltage capacitance switching switchs, including combination switch control system, mechanical switch；Described Combination switch control system connects mechanical switch；Described mechanical switch bag A phase master switch, C phase master switch, A phase auxiliary switch, C phase Auxiliary switch, B auxiliary mechanical switch；Described A phase master switch one end is electrically connected with A, the other end and A phase auxiliary switch one end Connect；Another termination separating brake electric capacity of A phase auxiliary switch；Described C phase master switch one end is electrically connected with C, and the other end is auxiliary with C phase Switch one end is helped to connect；Another termination separating brake electric capacity of C phase auxiliary switch；Described B Aided Machine one end is electrically connected with C, another End is connected with separating brake electric capacity；A phase master switch, C phase master switch, A phase auxiliary switch, C phase auxiliary switch, B auxiliary mechanical switch Control end to be connected with combination switch control system respectively；Described A phase auxiliary switch, a C phase auxiliary switch diode in parallel respectively String.
Further, described mechanical switch is vacuum machine switch, and its operating mechanism is permanent-magnet manipulating mechanism or eddy current Repulsive force mechanism.
Such as Fig. 1, identifying according in figure, A, B, C are Three-phase Power Systems bus, and O is that high-pressure reactive compensation Capacitor banks props up The neutral point on road, 1 is vacuum switch, and wherein 1-1 is master switch, and 1-2 is auxiliary switch, and 2 is diode string, and 3 is high-voltage reactive Compensate electric capacity.High-pressure reactive compensation electric capacity typically uses the earth-free connection of star, when the switch of A, C branch road all disconnects, and B The most also cannot constitute closed-loop path with other phases, B phase is equivalently employed without access system.Therefore, it can by Guan Bi and disjunction Order control, make B phase switch not operational load electric current, so, B phase branch road can be simplified, remove diode string and Main mechanical switch, leaves behind an auxiliary switch and plays buffer action, such that it is able to save equipment investment.
(assume that now K1 is Guan Bi) as a example by the phase branch road of A in Fig. 1 below, introduce the base of combination switch of the present invention This operation principle: utilize the reverse cut-off characteristics of diode to realize no-voltage and open and zero-current switching.The tool that no-voltage is opened Body running process is as follows: when the polarity of voltage at A, a two ends is for time negative, close K3.1, now, owing to diode is in reversely cut-off State, main circuit current is zero, i.e. K3.1 closes without arc；When the polarity of voltage at A, a two ends overturns, diode is from reversely Cut-off is transitioned into forward conduction state, and now master switch K3.2 is still in open position；After diode current flow, Guan Bi is main to be opened Close K3.2, now in the conduction state due to diode, K3.2 both end voltage by diode clamp, so K3.2 Guan Bi time the most not Electric arc, i.e. electric current can be produced and be switched to contact switch from noncontacting switch, finally realize no-voltage open-minded.
Turn off process is similar with opening process, when except for the difference that opening process is the Guan Bi controlling contact by polarity of voltage Sequence, turn off process is to control the disjunction sequential of contact by the sense of current.The specific works process of zero-current switching is as follows: when A, The sense of current at a two ends be from top to bottom time, disconnect K3.2, then electric current will gradually be transferred to diode from K3.2, when A, a two ends the sense of current upset time, due to the reverse cut-off characteristics of diode, main circuit current by vanishing, now K3.2 Being in open position, K3.1 is still in closing position；Auxiliary switch K3.1 is disconnected in during diode reverse is ended, due to Main circuit current is zero, and K3.1 disconnects process will not produce electric arc, finally realizes zero-current switching.
Further, described master control system includes voltage transformer, current transformer, signal conditioning circuit, numeral Control system, 5 vacuum machine switch combined floodgate drive circuits, 5 vacuum machines switch separating brake drive circuit, 5 vacuum switches The coil of electromagnetic operating mechanism, combination switch status display circuit and the charging of mechanical switch operating mechanism storage capacitor control electricity Road；Described voltage transformer and signal conditioning circuit are for point of zero voltage and the detection of frequency, and pass to numerical control system； Described signal conditioning circuit input voltage transformer respectively, current transformer connect；Signal conditioning circuit output connects digital control System inputs；The output of described numerical control system connects 5 vacuum machine switch combined floodgate drive circuits, 5 vacuum machines respectively and opens Close separating brake drive circuit, combination switch status display circuit and mechanical switch operating mechanism storage capacitor charging control circuit； Described current transformer and signal conditioning circuit are for current zero and the detection of frequency, and pass to numerical control system；Institute State combination switch status display circuit be mainly used in the supervision to combination switch duty and corresponding fault alarm is provided And fault message；Owing to the closing time of electromagnetic operating mechanism of vacuum machine switch and opening time are by the beginning of its storage capacitor Beginning voltage influence, in order to reduce the dispersibility of mechanical switch action, introduces storage capacitor charging control circuit, to ensure energy storage electricity Hold stablizing of initial voltage.
In fig. 2, label declaration, V is voltage transformer, and I is current transformer, and N is signal conditioning circuit, and G is numeral Control system, H is 5 vacuum machine switch combined floodgate drive circuits, and F is 5 vacuum machine switch separating brake drive circuits, and B is 5 The coil of the electromagnetic operating mechanism of vacuum machine switch, X is combination switch status display circuit, and C is mechanical switch operating mechanism Storage capacitor charging control circuit.
As can be known from Fig. 2, voltage transformer V and signal conditioning circuit N is mainly used in B phase voltage zero crossing and the inspection of frequency Surveying, the no-voltage for combination switch opens offer control foundation；It is electric that current transformer I is mainly used in B phase with signal conditioning circuit Flowing through the detection of zero point and frequency, the zero-current switching for combination switch provides control foundation；Combination switch status display circuit X It is mainly used in the supervision to combination switch duty and corresponding fault alarm and fault message are provided；Due to vacuum machine Closing time and the opening time of the electromagnetic operating mechanism of switch are affected by the initial voltage of its storage capacitor, in order to reduce machinery The dispersibility of switch motion, introduces storage capacitor charging control circuit C, to ensure stablizing of storage capacitor initial voltage.
The work process of the NEW TYPE OF COMPOSITE switch of the present invention is as follows:
1, closing a floodgate the stage, after receiving reclosing command, numerical control system G starts to be charged combined floodgate electric capacity, and to combined floodgate The charging interval of electric capacity is detected, and judges it is to enter combined floodgate program or enter fault alarm program according to the charging interval；Enter After entering combined floodgate program, numerical control system G passes through voltage transformer V and signal conditioning circuit N to B phase voltage zero crossing and frequency Detect, after voltage over zero being detected, close K1 immediately；K2.1 is closed, in order to make K2.2 institute also after delay time t1 What the diode string of connection was born after K2.1 closes the most pressure is unlikely to excessive, K2.1 should be made at t as far as possiblek2.1During this period of time Interior reliable Guan Bi；Closing K2.2 again after delay time t2, in order to ensure the reliable change of current of C phase branch current, K2.2 must be tk2.2Reliable Guan Bi in during this period of time；K3.1 is closed again, in order to make diode string in parallel for K3.2 exist after delay time t3 That is born after K3.1 Guan Bi the most pressure is unlikely to excessive, K3.1 should be made at t as far as possiblek3.1Reliable Guan Bi in during this period of time；? After close K3.2 again after delay time t4, in order to ensure, the reliable change of current of A phase branch current, K3.2 must be at tk3.2When this section Interior reliable Guan Bi, completes making process, and its control principle is as shown in Figure 3.
2, the separating brake stage, after receiving separating brake instruction, numerical control system G starts to be charged separating brake electric capacity, and right The charging interval of separating brake electric capacity is detected, and judges it is to enter separating brake program or enter fault alarm journey according to the charging interval Sequence；After entering combined floodgate program, numerical control system G passes through current transformer I and signal conditioning circuit N to B phase current zero crossing Detect with frequency, after voltage over zero being detected, delay time t5, disconnect K3.2, make the load current of A phase branch road turn Move on to, on the diode string in parallel with K3.2, bear the time of load current to reduce diode string, K3.2 should be made to exist as far as possible ttk3.2Interior disjunction；Delay time t6 again, disconnects K3.1, bears the most pressure to reduce A phase bypass diodes string Peak value, K3.1 should be made at tt as far as possiblek3.1Interior disjunction；Delay time t7 again, disconnects K2.2, makes the negative of C phase branch road Charged current is transferred to, on the diode string in parallel with K2.2, bear the time of load current in order to reduce diode string, should try one's best Make K2.2 at ttk2.2Interior disjunction；Delay time t8 again, disconnects K2.1, bears to reduce C phase bypass diodes string The most pressure peak value, should make K2.1 at tt as far as possiblek2.1Interior disjunction；Delay time t9 again, disconnects K1, completes separating brake Process, its control principle is as shown in Figure 4.
Being above presently preferred embodiments of the present invention, all changes made according to technical solution of the present invention, produced function is made With during without departing from the scope of technical solution of the present invention, belong to protection scope of the present invention.

Claims (4)

1. the NEW TYPE OF COMPOSITE switch for high-voltage capacitance switching, including combination switch control system, mechanical switch；Described Combination switch control system connects mechanical switch；It is characterized in that: described mechanical switch bag A phase master switch, C phase master switch, A phase are auxiliary Help switch, C phase auxiliary switch, B auxiliary mechanical switch；Described A phase master switch one end is electrically connected with A, and the other end is auxiliary with A phase Switch one end is helped to connect；Another termination load capacitance of A phase auxiliary switch；Described C phase master switch one end is electrically connected with C, another End is connected with C phase auxiliary switch one end；Another termination load capacitance of C phase auxiliary switch；Described B Aided Machine one end is electric with C phase Connecting, the other end is connected with load capacitance；A phase master switch, C phase master switch, A phase auxiliary switch, C phase auxiliary switch, B auxiliary machine The control end of tool switch is connected with combination switch control system respectively；The parallel connection respectively of described A phase auxiliary switch, C phase auxiliary switch One diode string.
NEW TYPE OF COMPOSITE for high-voltage capacitance switching the most according to claim 1 switchs, it is characterised in that: described machinery is opened Pass is vacuum machine switch, and its operating mechanism is permanent-magnet manipulating mechanism or eddy current repulsive force mechanism.
NEW TYPE OF COMPOSITE for high-voltage capacitance switching the most according to claim 2 switchs, it is characterised in that: described master control System processed includes that voltage transformer, current transformer, signal conditioning circuit, numerical control system, 5 vacuum machine switches close a floodgate Drive circuit, 5 vacuum machines switch separating brake drive circuit, the coil of 5 vacuum switch electromagnetic operating mechanisms, combination switch shapes State display circuit and mechanical switch operating mechanism storage capacitor charging control circuit；Described voltage transformer and signal condition electricity Road is used for point of zero voltage and the detection of frequency, and passes to numerical control system；Described signal conditioning circuit input voltage respectively Transformer, current transformer connect；Signal conditioning circuit output connects numerical control system input；Described numerical control system exports Connect 5 vacuum machine switch combined floodgate drive circuits respectively, 5 vacuum machine switch separating brake drive circuits, combination switch states show Show circuit and mechanical switch operating mechanism storage capacitor charging control circuit；Described current transformer and signal conditioning circuit are used In current zero and the detection of frequency, and pass to numerical control system；Described combination switch status display circuit is mainly used in To the supervision of combination switch duty and provide corresponding fault alarm and fault message；Electricity due to vacuum machine switch Closing time and the opening time of magnetic operating mechanism are affected by the initial voltage of its storage capacitor, in order to reduce mechanical switch action Dispersibility, introduce storage capacitor charging control circuit, to ensure stablizing of storage capacitor initial voltage.
4. the method for work switched based on the NEW TYPE OF COMPOSITE for high-voltage capacitance switching described in claim 1-3, it is special Levy and be: comprise the following steps:
S1 closes a floodgate the stage: after receiving reclosing command, and numerical control system starts to be charged combined floodgate electric capacity, and to the electricity that closes a floodgate The charging interval held is detected, and judges it is to enter combined floodgate program or enter fault alarm program according to the charging interval；Enter After combined floodgate program, B phase voltage zero crossing and frequency are carried out by numerical control system by voltage transformer and signal conditioning circuit Detection, after voltage over zero being detected, Guan Bi B auxiliary mechanical switch immediately；C phase master switch, C is closed after delay time t1 Phase master switch is at tk2.1Reliably close in time；Closing C phase auxiliary switch again after delay time t2, C phase auxiliary switch is at tk2.2Time Interior reliable Guan Bi；Closing A phase master switch again after delay time t3, A phase master switch is at tk3.1Reliably close in time；The most again Closing A phase auxiliary switch after delay time t4, A phase auxiliary switch is at tk3.2Reliably close in time；
The S2 separating brake stage: after receiving separating brake instruction, numerical control system starts to be charged separating brake electric capacity, and to separating brake electricity The charging interval held is detected, and judges it is to enter separating brake program or enter fault alarm program according to the charging interval；Enter After separating brake program, B phase current zero crossing and frequency are carried out by numerical control system by current transformer and signal conditioning circuit Detection, after current zero-crossing point being detected, delay time t5, disconnect A phase auxiliary switch, make the load current of A phase branch road shift On the diode string in parallel with A phase auxiliary switch, A phase auxiliary switch is at ttk3.2Disjunction in time；Delay time t6 again, disconnected Opening A phase master switch, A phase master switch is at ttk3.1Disjunction in time；Delay time t7 again, disconnects C phase auxiliary switch；C phase assists out Close at ttk2.2Disjunction in time；Delay time t8 again, disconnects C phase master switch, and C phase master switch is at ttk2.1Disjunction in time；Prolong again Time time t9, disconnect B auxiliary mechanical switch.
CN201610467314.1A 2016-06-24 2016-06-24 A kind of combination switch and its working method for high-voltage capacitance switching Active CN106057566B (en)

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