CN201440390U

CN201440390U - Non-surge arc-extinguishing device

Info

Publication number: CN201440390U
Application number: CN2009200580340U
Authority: CN
Inventors: 不公告发明人
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-06-03
Filing date: 2009-06-03
Publication date: 2010-04-21
Anticipated expiration: 2019-06-03
Also published as: WO2010139190A1

Abstract

The utility model discloses a non-surge arc-extinguishing device, which belongs to the field of an electric switch and is used in a contactor and a switch for switching the capacitive loads. Silicon controlled thyristors (SCR) are connected in parallel at both ends of a main circuit of the contactor, one continuity trigger signal of the SCR is controlled by a control circuit, and the other continuity trigger signal of the SCR comes from a contact bridge of the main circuit contactor, and the continuity trigger signal of the SCR has double-trigger modes of control trigger by the control circuit and the contact bridge trigger by the main circuit. When the contactor is switched on, the control circuit provides the trigger signal for the SCR, and when the contactor is switched off, the contact bridge of the contactor provides the trigger signal to achieve the functions of switching on and switching off the capacitive loads without surge and without arc of the contactor.

Description

No surge arc-control device

Technical field

The utility model does not have the surge arc-control device and belongs to the electric switch field, particularly a kind of be suitable for capacitive load connected in the contactor of disjunction and the switch use.

Background technology

At present in electric power system, generally utilize the parallel connection of common capacitor switching contactor switching electric capacitor in the line as power factor compensation, but traditional common capacitor switching contactor is limited to connecting the surge current restraint, still have the existence of tens times of impulse currents, and it does not have electronic arc-suppressor, electric arc is big during disjunction electric capacity, uses electric life short; The thyristors and capacitors fling-cut switch has the electric capacity of connection not have surge, the Arc-free advantage of disjunction electric capacity, but because the big temperature rise of its conduction voltage drop, there is the problem of big harmonic pollution to exist, a kind of capacitor switching switch that is combination switch of controllable silicon and mechanical contact parallel-connection structure has appearred on the market adopting for this reason, it is low that it possesses the pressure drop of connection, connect the electric capacity no-flashy-flow, the Arc-free advantage of disjunction electric capacity, operation principle is to utilize controllable silicon in parallel with mechanical contact, controllable silicon triggering and conducting signal is triggered by single control loop, before the mechanical contact of switch is connected by control loop during in mechanical contact both end voltage zero passage the controllable silicon to parallel connection the conducting of triggering signal controllable silicon is provided, avoided the surge impact electric current of connection; During the switch disjunction, trigger controllable silicon once more by control circuit, after mechanical contact separates, control loop turn-offs silicon controlled trigger signal after time-delay a period of time, finish no electric arc breaking course, because when there is disjunction certain and uncertain value the court of a feudal ruler in the disjunction of Mechanical Contact device, for guaranteeing to reach the Arc-free purpose of reliable disjunction, need after mechanical contact separates, controllable silicon will keep one section long ON time, it is long that controllable silicon needs the operating time of conducting when having disjunction, the controllable silicon power utilization is low, it is higher to generate heat, the shortcoming of reliability decrease, accumulator also must be arranged during disjunction or add an accessory power supply in addition and give the control loop continued power, to guarantee that having enough triggering energy to keep triggers the controllable silicon conducting, this has also brought contactor control loop circuit complexity, response speed is slow, awkward problem.

Summary of the invention

The purpose of this utility model be to avoid the weak point of existing capacitor switching switch and provide that a kind of circuit is simple, easy to use, volume is little, cost is low, reliability is high be mounted to a kind of no surge arc-control device in the different current/voltage grade contactors.

Realize that the purpose of this utility model reaches by the following technical programs: controllable silicon is connected in parallel on contactor major loop two ends, silicon controlled conducting triggering signal is come from controlling the loop, bridge is touched from the major loop contactor in another road, and controllable silicon conducting triggering signal is touched bridge by major loop and triggered and control back the two triggering modes of control triggering.In the course of work that contactor is connected, before contactor touches the bridge closure, earlier when major loop both end voltage zero passage, provide the triggering pumping signal for this device input by control loop, the controllable silicon conducting plays the electric current bypass, to the earlier no surge energising of load capacitance, touch the bridge closure then, the control loop triggering signal is closed; In the course of work of contactor disjunction, when the alternating voltage at major loop two ends during not at zero point, touch the moment of bridge disjunction at contactor, there is potential difference according to touching bridge with respect to the two ends fixed contact, touch bridge by contactor triggering signal is provided, the controllable silicon triggering and conducting plays the electric current bypass, controllable silicon will turn-off when current over-zero voluntarily, reach the effect of contactor disjunction arc extinguishing.

No surge arc-control device, when adopting unidirectional control silicon, its feature is by the one-way SCR TR1 of two reverse parallel connections, TR2 is connected in parallel on contactor major loop J1, the J2 two ends, the triggering signal of control loop is by input port J3, J4 is connected respectively to controllable silicon TR1, the control utmost point of TR2, two diode D1, common sun series connection of D2 and common oedoeagus are connected to contactor and touch bridge SW1, diode D1, the negative electrode of D2 is respectively by resistance R 1, resistance R 2, be connected to controllable silicon TR1, the control utmost point of TR2, two diode D3, D4 respectively is connected in parallel on two one-way SCR TR1, between the control utmost point and negative electrode of TR2, the negative pole of diode extremely links to each other with one-way SCR control, and positive pole links to each other with the one-way SCR negative electrode.

No surge arc-control device, when adopting bidirectional triode thyristor, its feature is in parallel by bidirectional triode thyristor SCR and contactor major loop J1, J2 two ends, and the triggering signal of control loop is connected to the SCR control utmost point by input port J3, touches bridge SW1 and is connected to the controllable silicon SCR control utmost point by current-limiting resistance R1.

Of the present utility model reasonable in design, reaching contactor connection electric capacity does not have the surge impact electric current, the disjunction arc extinguishing, and the controllable silicon ON time is short, the contacts of contactor long service life, can effectively improve the reliability of power factor capacitance compensation system, reduce the operation cost of capacitance compensation system.

Description of drawings

Accompanying drawing 1 is one of embodiment of the present utility model circuit diagram.

Accompanying drawing 2 is two circuit diagrams of embodiment of the present utility model.

Embodiment

As shown in Figure 1, the utility model is by the one-way SCR TR1 of two reverse parallel connections, TR2 is connected in parallel on two ends, contactor major loop contact, J1, J2 is the major loop input and output end points of contactor, J3, J4 is the external control loop triggering signal input port of this device, resistance R 1, diode D1, D2, resistance R 2 is connected in series between the two one-way SCRs control utmost point, R1, R2 is that controllable silicon triggers current-limiting resistance, two diode D1, common sun series connection of D2 and common oedoeagus are connected to contactor and touch bridge SW1, diode D1, D2 is used for oppositely by J1, the voltage at J2 two ends prevents that voltage from forming the loop by the SCR control utmost point controllable silicon is misleaded.Two diode D3, D4 respectively are connected in parallel between the control utmost point and negative electrode of two one-way SCR TR1, TR2 in addition; the negative pole of diode extremely links to each other with one-way SCR control; positive pole links to each other with the one-way SCR negative electrode, plays the impact that the protection SCR control utmost point is not subjected to reverse current.

Connect in the course of work at contactor: earlier by control loop, drive for the excitation signal of telecommunication respectively by J3, J4 port and trigger controllable silicon TR1, TR2 conducting during in major loop both end voltage zero passage, when end points J1 is positive potential to end points J2, controllable silicon TR1 conducting; When end points J1 was negative potential to end points J2, bridge SW1 closure was touched in controllable silicon TR2 conducting then, and external zero cross fired control loop closes for the controllable silicon drive signal, plays contactor electric capacity is not had the purpose that surge does not have arc starting.

In the process that contactor disconnects: as J1, J2 both end voltage during not at zero point, contactor touches the moment of bridge SW1 disjunction, touch bridge SW1 and will form potential difference two-end-point J1, J2, signal triggering controllable silicon conducting thus, electric current reaches the purpose of contactor disjunction arc extinguishing by the controllable silicon bypass.Trigger current to the controllable silicon TR1 control utmost point, triggers controllable silicon TR1 conducting by diode D1, current-limiting resistance R1 when end points J1 is positive potential to end points J2, and controllable silicon turn-offs when current over-zero voluntarily; When end points J1 was negative potential to end points J2, trigger current to the controllable silicon TR2 control utmost point, triggered controllable silicon TR2 conducting by diode D2, current-limiting resistance R2, and controllable silicon turn-offs when current over-zero voluntarily; By only controllable silicon work of need in each contactor disjunction arc extinguishing process, and maximum ON time only is half ripple.

As shown in Figure 2, be connected in parallel on two ends, contactor major loop contact by bidirectional triode thyristor SCR.J1, J2 are contactor major loop input and output end points, J3 is the input port of the external control loop triggering signal of this device, the control loop triggering signal is input to the control utmost point of controllable silicon SCR by port, and the SCR control utmost point connects one in addition to be triggered current-limiting resistance R1 and touch bridge SW1 to contactor.In the course of work that contactor is connected, before touching bridge SW1 and connect, contactor provide a signal of telecommunication to this device J3 input by control loop during in major loop end points J1, J2 both end voltage zero passage, trigger bidirectional triode thyristor SCR conducting, touch bridge SW1 closure then, external zero cross fired control loop closes for the controllable silicon drive signal, plays contactor electric capacity is not had the purpose that surge does not have arc starting.

In the process that switch disconnects, as J1, J2 terminal voltage not when the zero point, contactor touches the moment of bridge SW1 disjunction, touch bridge SW1 and will form potential difference two-end-point J1, J2, triggering signal is controlled the utmost point by current-limiting resistance R1 to controllable silicon SCR, trigger the controllable silicon SCR conducting, the purpose that reaches contactor disjunction arc extinguishing is turn-offed during at current over-zero voluntarily at controllable silicon; Maximum ON time is half ripple in each contactor disjunction arc extinguishing process.

Claims

1. no surge arc-control device, it is characterized in that being connected in parallel on contactor major loop two ends by controllable silicon, the silicon controlled conducting triggering signal control loop of coming, another road conducting triggering signal of silicon controlled is touched bridge from the major loop contactor, and controllable silicon conducting triggering signal is triggered by control loop control and major loop touches the two triggering modes of bridge triggering.

2. no surge arc-control device according to claim 1, its feature is by the one-way SCR TR1 of two reverse parallel connections, TR2 is connected in parallel on contactor major loop J1, the J2 two ends, the triggering signal of control loop is by input port J3, J4 is connected respectively to controllable silicon TR1, the control utmost point of TR2, two diode D1, common sun series connection of D2 and common oedoeagus are connected to contactor and touch bridge SW1, diode D1, the negative electrode of D2 is respectively by resistance R 1, resistance R 2, be connected to controllable silicon TR1, the control utmost point of TR2, two diode D3, D4 respectively is connected in parallel on two one-way SCR TR1, between the control utmost point and negative electrode of TR2, the negative pole of diode extremely links to each other with one-way SCR control, and positive pole links to each other with the one-way SCR negative electrode.

3. no surge arc-control device according to claim 1, its feature is in parallel by bidirectional triode thyristor SCR and contactor major loop J1, J2 two ends, the triggering signal of control loop is connected to the SCR control utmost point by input port J3, touches bridge SW1 and is connected to the controllable silicon SCR control utmost point by current-limiting resistance R1.