CN2914310Y

CN2914310Y - Intelligent combination switch

Info

Publication number: CN2914310Y
Application number: CN 200520099258
Authority: CN
Inventors: 周建民; 林德焱; 李宏斌; 肖朝法
Original assignee: WUHAN JIANGBEI SWITCH CO Ltd
Current assignee: WUHAN JIANGBEI SWITCH CO Ltd
Priority date: 2005-12-08
Filing date: 2005-12-08
Publication date: 2007-06-20
Anticipated expiration: 2015-12-08

Abstract

The utility model relates to an intelligent-type combination switch comprising three relays and control circuits, wherein main contacts of each relay are respectively connected with three phases of main circuits. The input and output of the main contacts are respectively connected with the grid and capacitors (capacitor group). Control coils of the relays are connected with output control wires of a control circuit. The utility model is characterized in that: Wherein, main contacts of two relays are respectively linked in parallel with a SCR (silicon controlled rectifier); triggers of the SCRs are connected with output control wires in the control circuit. Neither inrush current nor arc happens when the capacitors are switched in or out, because a circuit structure of relay contacts in parallel connection with SCRs is utilized in the utility model. Thus, service life of the relays can be prolonged. Moreover, selecting rather small capacity of SCRs can meet the application requirements of capacitance compensation cabinet.

Description

Intelligent combination switch

Technical field

The utility model belongs to a kind of fling-cut switch of commercial power capacitance compensating cabinet, particularly a kind of intelligent combination switch.

Background technology

The fling-cut switch of commercial power capacitance compensating cabinet often adopts the fling-cut switch of relay (contactor) as capacitor at present, because capacitor volume is very big, major loop has very big shoving when dropping into electric capacity, and relay is contact meeting arcing when switching, influenced the useful life of relay and building-out capacitor, if adopt the fling-cut switch of controllable silicon as electric capacity, because certain pressure drop is arranged during the controllable silicon conducting, heating is very serious when flowing through big electric current, must install bigger radiator additional, both increased the volume of switch, more high-power loss had been arranged again.

Summary of the invention

The purpose of this utility model provide a kind of can not produce shove, intelligent combination switch that oneself power consumption is very little again, to overcome above-mentioned deficiency.

To achieve these goals, the utility model is made of three relays and control circuit, wherein the main contact of each relay is connected on respectively in the three-phase of major loop, the input and output of its main contact are connected with capacitor (capacitor group) with electrical network respectively, the control coil of relay is connected with the output control line of control circuit, be characterized in: respectively be parallel with a controllable silicon therein on the main contact of two relays, the silicon controlled trigger end is connected with the output control line of control circuit;

Above-mentioned control circuit produces circuit by central processor CPU, amplifying circuit and triggering signal and constitutes, wherein the data input pin of central processor CPU links to each other with the switching signal with the phase test signal, the relay control signal output of central processor CPU and the input of output of SCR control signal and amplifying circuit join, the output of amplifying circuit is connected with the input that triggering signal produces circuit with the control coil of relay respectively, and the output that triggering signal produces circuit is connected with the silicon controlled trigger end.

Because the utility model adopts the circuit structure of relay contact and controllable silicon parallel connection, cooperation is by the Switching Strategy and the switching choose opportunities of software control, make when capacitor drops into, can not produce and shove, switching all can arcing, thereby prolonged the useful life of relay, and can select the instructions for use that just can satisfy capacitor compensation cabinet than the controllable silicon of low capacity for use.

Description of drawings

Fig. 1 is the syndeton schematic diagram of the utility model major loop.

Fig. 2 is the utility model control circuit theory diagram.

Embodiment

The utility model will be further described below in conjunction with drawings and Examples.

The syndeton of major loop of the present utility model as shown in Figure 1, bidirectional triode thyristor S1, S2 and magnetic latching relay K1, K2, K3 form main switch jointly among the figure, S1, S2 realize that mainly building-out capacitor is not had the function of impacting ground input electrical network Ua, Ub, Uc or disconnecting from electrical network Ua, Ub, Uc, relay K 1, K3 reliably connect the back closure at bidirectional triode thyristor S1, S2, with bidirectional triode thyristor S1, S2 short circuit, realize normal operation function.Relay K 2 realizes switching on or off the function of circuit, moves when no current.

The sequence of movement of the utility model input compensation capacitor C:, respectively controllable silicon S1, S2 choosing is connected then, again with relay K 1, K3 closure at first with relay K 2 closures; The sequence of movement of excision building-out capacitor C: at first under the situation that controllable silicon S1, S2 connect, disconnect relay K 1, K3, stop the triggering signal of controllable silicon S1, S2 then, disconnect relay K 2 at last.In the process of input compensation capacitor C, after the K2 closure, circuit does not form the loop, no current, select the mode that is connected through controllable silicon S1, S2 employing, promptly voltage is the conducting of 0V time trigger controllable silicon between the contactor fracture, and the overcurrent multiple can be controlled in 2 times of rated current.In the excision compensation condenser process, stop the triggering signal of controllable silicon S1, S2 after, during current over-zero, controllable silicon turn-offs naturally, capacitor C is out of service, can not impact to electrical network.It all is to finish under the condition of controllable silicon S1, S2 by-path turn-on that relay K 1, K3 switch on and off, so fracture can arcing; Relay K 2 is the switching electric current not, and fracture can arcing yet.This switching mode has effectively been protected relay contact, prolongs the useful life of relay and corresponding combination switch thereof greatly.

The acp chip central processor CPU of control circuit of the present utility model (as shown in Figure 2) adopts the 89C2051 single-chip microcomputer.Singlechip CPU accept from idle compensating control throwing, cut signal, high level is for throwing, low level is for cutting.After CPU receives switching compensation condenser signal,, send corresponding signal (be high level and represent to connect, low level is represented to disconnect) for respectively relay K 2, controllable silicon S1, S2, relay K 1, K3 promptly according to the sequence of movement of design.For safety action reliable, there is certain hour at interval between per two actuating signals, guarantee like this before each action that the preceding once transient process of action finishes, wherein the input point of controllable silicon S1, S2 triggering signal is respectively when relay K 1 and relay K 3 fracture voltage zero passages.The above-mentioned course of work all realizes with software in single-chip microcomputer 89C2051.According to the design of program, receive the switching signal of slave controller when single-chip microcomputer after, program can the final controlling element initialization and phase-detection work, and according to program setting, selects suitable opportunity (phase place) that corresponding controllable silicon or relay are sent action command.

The utility model can also realize that system cut-off detects with power supply to fall mutually to detect, and can in time allow switch reset during power failure, guarantees that system's upper electrical switch all is in off-state in any case, does not have shoving when powering on.

The content that is not described in detail in this specification belongs to this area professional and technical personnel's known prior art.

Claims

1, a kind of intelligent combination switch, constitute by three relay K 1～K3 and control circuit, wherein the main contact of each relay is connected on respectively in the three-phase of major loop, the input and output of its main contact are connected with capacitor with electrical network respectively, the control coil of relay is connected with the output control line of control circuit, it is characterized in that: respectively be parallel with controllable silicon S1, a S2 on the main contact of two relay K 1, K3 therein, the trigger end of controllable silicon S1, S2 is connected with the output control line of control circuit.

2, intelligent combination switch as claimed in claim 1, it is characterized in that: control circuit is by central processor CPU, amplifying circuit and triggering signal produce circuit and constitute, wherein the data input pin of central processor CPU links to each other with the switching signal with the phase test signal, the relay control signal output of central processor CPU and the input of output of SCR control signal and amplifying circuit join, the output of amplifying circuit is connected with the input that triggering signal produces circuit with the control coil of relay respectively, and the output that triggering signal produces circuit is connected with the silicon controlled trigger end.