CN102592867A

CN102592867A - Synchronous switch

Info

Publication number: CN102592867A
Application number: CN2012100465739A
Authority: CN
Inventors: 张斌; 张鹏
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-02-27
Filing date: 2012-02-27
Publication date: 2012-07-18

Abstract

The invention discloses a synchronous switch, which consists of a common switch (comprising a load switch, a circuit breaker and a contactor), a trigger electrode, a trigger impulse power supply and a trigger impulse controller, wherein the trigger electrode, the trigger impulse power supply and the trigger impulse controller are additionally arranged in an arc extinguish chamber. The synchronous switch can solve the problems of poor reliability, low stability, high cost and the like in the traditional synchronous switch.

Description

A kind of synchro switch

Technical field

The present invention relates to a kind of synchro switch.Belong to the relevant appliance switch technical field that voltage phase angle is controlled, zero current cut-offs requirement of closing.

Background technology

The requirement of synchro switch being closed the phase angle of closing voltage has two kinds, and a kind of is to close to close condensive load, closes when requiring voltage to be zero and runs the pass jointly, and another kind is to close to close inductive load, closes when requiring voltage for peak value and runs the pass jointly.Purpose all is to shove for avoiding.Presents closes when requiring voltage to serve as zero runs that to close be that example is described jointly, to simplify literal, is convenient to reading comprehension.All voltages are zero example, are applicable to that all requiring voltage is the situation of peak value.

Existing synchro switch has dual mode.A kind of is through memory switch operate time, voltage be zero constantly before, send actuating signal to switch in advance, the time that shifts to an earlier date is exactly the switch motion time of once remembering, and makes contact in contact moment, the time of just in time arriving in voltage over zero.The shortcoming of this mode is: 1. the many factor affecting such as capacity and internal resistance that receive mechanism's mechanical friction power, time, temperature, supply voltage, storage capacitor the operate time of switch.And the capacity of the mechanical friction power of mechanism, storage capacitor and internal resistance all are difficult to measure when the energy storage state.Its reliability and precision all can not be very high.2. concerning threephase switch, the time of Zero Crossing Point for Three Phase Voltage is different, and switch closes, sub-switching operation must be operated in phase-splitting, needs three operating mechanisms, and manufacturing cost is inevitable significantly to be increased.The method that another kind of synchro switch adopts is: controllable silicon is connected in parallel on the main contact two ends of regular tap, and it is fashionable to close at needs, triggers controllable silicon earlier, makes its conducting when voltage is zero, closes the main contact of running the pass jointly then, avoids shoving with this; When needs cut-off, main contact broke off earlier, and when treating the load current zero crossing, controllable silicon cut-offs again, the generation overvoltage of avoiding damming.Under the high voltage situation, need a plurality of controllable silicon series connection, the cost of this mode is quite high.Restricted by reliability of electronic components, combined reliability is not high.

Summary of the invention

The purpose of this invention is to provide a kind of synchro switch, require the switching technique problem that close the no-voltage pass, zero current cut-offs with solution.

The present invention realizes that the technical scheme of foregoing invention purpose is following:

Scheme 1: in the arc control device on regular tap (on-load switch, contactor, circuit breaker); Position near a main contact; A trigger electrode of being processed by electric conducting material is set; When the distance between a said main contact and the trigger electrode has remained on the input of trigger impulse voltage, can guarantee the distance of discharging.The plasma of discharge generation conduction causes between two main contacts of arc control device and is converted into conduction state by state of insulation; The trigger impulse power output end is connected respectively with trigger electrode with a main contact; The control end of trigger impulse power supply closes with reception, separating brake is ordered and detect the terminal voltage of regular tap main contact and the trigger impulse controller of current signal is connected.

Scheme 2: with the vacuum trigger switch, the main contact of claiming TVS pipe again is connected in parallel on two main contacts of arc control device of regular tap; Pulse power output is sent out in the triggering port contact of vacuum trigger switch; The control end of trigger impulse power supply closes with reception, separating brake is ordered and detect the terminal voltage of regular tap main contact and the trigger impulse controller of current signal is connected.

Advantage of the present invention and good effect are following:

1, utilize the discharge of trigger impulse voltage, realize that the no-voltage pass of switch is closed, zero current cut-offs, and the precision of its time and reliability have the raising of internal;

2, because the reliable no-voltage that realizes switch is closed closes, zero current cut-offs, and the impact of electrical network is reduced greatly, eliminates consequent shoving and overvoltage, and the reliability service of electrical network is of great importance;

3, because close the reliable no-voltage pass of switch of realizing, zero current cut-offs, the electrical wear of main contact reduces greatly, prolongs the useful life of Switch main body, improves the reliability of Switch main body;

4, owing to close the reliable no-voltage pass of switch of realizing, zero current cut-offs, and is strict, harsh unlike former that kind to the requirement of Switch main body, can reduce the manufacturing expense of Switch main body;

5, supporting with it trigger impulse power supply, the more existing synchro switch control device of trigger impulse controller is simple, cheap, reliable;

6, integrated cost is lower than existing synchro switch, is beneficial to penetration and promotion;

Description of drawings

Fig. 1 is schematic illustration of one embodiment of the invention.

Fig. 2 is the sketch map of the another kind of embodiment of the present invention.

Embodiment

Concrete structure of the present invention and operation principle are explained as follows:

Referring to Fig. 1, Fig. 1 provides a kind of embodiment.In the arc control device of regular tap (on-load switch, contactor, circuit breaker), increase by a trigger electrode 3.Trigger electrode 3 usefulness electric conducting materials are processed, and are installed in the inside of arc control device 4 main contacts 2.The output contact generating utmost point 3 and the main contact 2 of trigger impulse power supply 5.Trigger impulse controller 6 receives and closes, separating brake order 7 and detect terminal voltage, the current signal 8 of main contact 1,2.After receiving the order 7 of closing a floodgate; Detect 1,2 terminal voltages of three-phase main contact respectively; When three-phase main contact terminal voltage reaches null value successively, trigger the trigger electrode 3 in these phase arc control device 4 respectively, produce the plasma of conduction; Making its terminal voltage at

main contact

1,2 is zero moment to be converted into conducting state by state of insulation, and the realization no-voltage is closed and closed.Because begin to the time greater than triggering and conducting time of main contact connections needs from the order of closing a floodgate, after the triggering and conducting, load current passes through from the electric arc in main contact gap.When main contact contacted, terminal voltage reduced to zero, the arc extinction between main contact, and load current flows through from main contact, accomplishes no-voltage and closes the process of closing; When trigger impulse controller 6 receives the separating brake order, trigger the trigger electrode 3 of three-phase arc control device simultaneously, reach in the time of separating brake position from beginning to be separated at main contact; Load current passes through from the electric arc in main contact gap, because trigger impulse voltage continues to produce the plasma that conducts electricity during this, makes to keep conducting state between the main contact; Load current can not block suddenly; Avoid by the generation overvoltage of damming, so that cause arc reignition, cause and turn-off failure.When treating that the three-phase main contact moves to the separating brake position; Trigger impulse controller 6 detects the electric current of three-phase main contact, when each phase current zero crossing, stops the trigger impulse voltage of each phase respectively successively; Make and recover state of insulation between the main contact at once, realize the purpose that zero current cut-offs.The judgement that main contact moves to the separating brake position has two kinds of schemes, and a kind of is to install position transducer additional; Another kind is according to the main contact run duration, and time-delay detects the main contact electric current.

Fig. 2 provides the another kind of embodiment of synchro switch.With the vacuum trigger switch, claim that again the

main contact

10,11 of TVS pipe 9 is connected in parallel on 4 liang of main contacts of

arc control device

1,2 of regular tap (on-load switch, circuit breaker, contactor).The vacuum trigger switch claims that again triggering, the control of TVS pipe 9 is identical with Fig. 1.Different is that trigger impulse voltage is to be applied to the vacuum trigger switch, on the trigger electrode 3 of claiming TVS pipe 9 again and the main contact 10.For threephase switch, need three vacuum trigger switches (TVS pipe) be connected in parallel on respectively on three arc control device of switch, trigger, control by three trigger impulse power supplys and controller respectively.

Claims

1. synchro switch; It is characterized in that; In the arc control device on common switch,, a trigger electrode of being processed by electric conducting material is set near the position of a main contact; When the distance between a said main contact and the trigger electrode has remained on the input of trigger impulse voltage, can guarantee the distance of discharging; The trigger impulse power output end is connected respectively with trigger electrode with a main contact; The control end of trigger impulse power supply with receive close, separating brake order and the terminal voltage of sense switch main contact and the trigger impulse controller of current signal be connected.

2. a synchro switch is characterized in that, with the vacuum trigger switch, the main contact of claiming TVS pipe again is connected in parallel on two main contacts of arc control device of regular tap; Pulse power output is sent out in the triggering port contact of vacuum trigger switch; The control end of trigger impulse power supply closes with reception, separating brake is ordered and detect the terminal voltage of regular tap main contact and the trigger impulse controller of current signal is connected.