CN202134887U

CN202134887U - Protector for three-phase non-contacting switch

Info

Publication number: CN202134887U
Application number: CN201120258204U
Authority: CN
Inventors: 陈红志
Original assignee: XIANGTAN HUAYU TECHNOLOGY Co Ltd
Current assignee: XIANGTAN HUAYU TECHNOLOGY Co Ltd
Priority date: 2011-07-21
Filing date: 2011-07-21
Publication date: 2012-02-01
Anticipated expiration: 2021-07-21

Abstract

The utility model discloses a protector for a three-phase non-contacting switch. The protector is mainly composed of a mutual conductor, a detector, a trigger, a protection switch, a control switch, a bidirectional triode thyristor, and a delay DC power supply. The protector can protect an electronic device of a grid from overload, over-voltage, short circuit, phase breaking, motor blocking, turn-to-turn short circuit and the like. And the protector for the three-phase non-contacting switch has characteristics of simple structure, small volume, low cost, and quick protection action. The protector for the three-phase non-contacting switch is an ideal protection device for the three-phase non-contacting switch.

Description

Three phase power noncontacting switch protector

Affiliated technical field

The utility model relates to a kind of Protector for electric appliances of three phase power noncontacting switch protector, is specially adapted to the protective effect such as short circuit, the phase failure, overvoltage, overload of industrial electrical equipment equipment.

Background technology

Present three phase power contactless electronic beam switch device; Contactless in the course of work; Eliminate existing three-phase power switch moment clutch and produce shortcomings such as arcing and pitting of contacts; Therefore have fire prevention, advantage such as explosion-proof, and this switching device life-span is long, simple in structure, installation and maintenance convenient, when having saved simultaneously the manufacturing contact switch in a large number need non-ferrous metal and contact precious metal, so economically valuable.But this switching device it adopt bidirectional triode thyristor to accomplish on-off action; And switch when work unprotect device; Therefore when faults such as industrial electrical equipment equipment or electrical network generation overload, short circuit, the phase failure, overvoltage, motor rotation blockage or turn-to-turn short circuit, burn out bidirectional triode thyristor easily, and cause industrial electrical equipment device and the equipment of burning out; Cause unnecessary economic loss and accident, therefore this switching device is unreliable dangerous.

Summary of the invention

The purpose of this invention is to provide a kind of safe and reliable three phase power noncontacting switch protector, and can accomplish protective effect multiple functions such as electric equipment or electric net overload, short circuit, overvoltage, the phase failure, motor rotation blockage or turn-to-turn short circuits.

Technical scheme of the present invention is; A kind of three phase power contactless electronic beam switch device; It is made up of control switch K1, three bidirectional triode thyristor BG1, BG2, BG3, time-delay DC power supply E, three instrument transformer T, three groups of detector F, trigger G and protection switch K2; Wherein every group of detector F is made up of rectifier D1, potentiometer W1, diode D2; Unidirectional or bidirectional triode thyristor D3 constitutes trigger G by two potentiometer W2, W3 and one; Three input a of three bidirectional triode thyristor BG1, BG2, BG3 are connected with three-phase power line A, B, C respectively, and three output b are connected with load D after being connected in series the primary coil of three instrument transformer T respectively, and three control end e are connected with three terminals d, e, the f of control switch K1 respectively; Three terminals a, b, c are connected with three terminals a, b, the c of protection switch K2 respectively control switch K1 in addition; Three terminals d, e, f in addition of protection switch K2 are connected with the input a of three bidirectional triode thyristor BG1, BG2, BG3 respectively, and the secondary coil of each instrument transformer T is connected with the rectifier D1 input of every group of detector F respectively, and its output is connected with potentiometer W1 two ends; Potentiometer one end ground connection wherein; Potentiometer W1 centre cap is connected with diode D2 anode, and the negative terminal of the diode D2 of the three groups of detector F back that is connected in parallel is connected with potentiometer W2 one end of trigger G, is connected with potentiometer W3 one end after the other end of potentiometer W2 and the centre cap parallel connection; Potentiometer W3 one end also with after the output stage b parallel connection of its centre cap, unidirectional or bidirectional triode thyristor D3 is connected with coil L one end of protection switch K2; Coil L other end ground connection, input utmost point a unidirectional or bidirectional triode thyristor D3 is connected any two phases of its input termination three-phase alternating-current supply with the output of time-delay DC power supply E.

The utlity model has following technique effect; Can shield to multiple functions such as electric equipment or electric net overload, short circuit, overvoltage, the phase failure, motor rotation blockage or turn-to-turn short circuits; And the protection action is quick, sensitive, safe and reliable, and the utility model is simple in structure simultaneously, volume is little, and cost is low; Being easy for installation and maintenance, is a kind of desirable three phase power noncontacting switch protector.

Description of drawings

Fig. 1 is the electrical schematic diagram of the utility model

Specific embodiment

As shown in Figure 1; A kind of three phase power contactless electronic beam switch device; It is made up of control switch K1, three bidirectional triode thyristor BG1, BG2, BG3, time-delay direct voltage E, three instrument transformer T, three groups of detector F, trigger G and protection switch K2; Wherein every group of detector F is made up of rectifier D1, potentiometer W1, diode D2, and unidirectional or bidirectional triode thyristor D3 constitutes trigger G by two potentiometer W2, W3 and one.Three input a of three bidirectional triode thyristor BG1, BG2, BG3 respectively with three-phase power A mutually, B phase, C be connected; Three output b are connected with load D after being connected in series the primary coil of three instrument transformer T respectively; Three control end e are connected with three terminals d, e, the f of control switch K1 respectively; In addition three terminals a of control switch K1, b, c are connected with three bidirectional triode thyristor BG1,2,3 input a respectively with three terminals d of protection switch K2, e, f respectively; Three two-way phase controllable silicon BG1, BG2, BG3 adopt BCR type pipe, select concrete specification according to load D watt level, control switch K1 it by magnetic switch and one movably magnetic NS be assembled in one and independently constitute in the plastic casing; Magnetic NS is installed in the groove on the plastic casing; Can move around along groove, magnetic switch adopts XT-CK4 type magnetic switch device, long 40 millimeters, wide 35 millimeters, high 30 millimeters of the size of plastic casing; As mobile magnetic NS during near magnetic switch; Control switch K1 connects, and as magnetic NS during away from magnetic switch, control switch K1 breaks off.

The secondary coil of each instrument transformer T is connected with the rectifier D1 input of every group of detector F respectively; The effect of instrument transformer T provides alternating current impression signal voltage of detector F; It adopts E font or annular core and the primary and secondary coil of coiling above that to be made; The primary coil winding be 1 to 200 circle, inferior at the beginning of coil windings be 800 and 3000 circles, embodiment instrument transformer T adopts E font silicon steel sheet, specification is the E-9 fabrication of iron core.

The rectifier D1 output of every group of detector F is connected with potentiometer W1 two ends, and wherein potentiometer W1 one end draws and seeks, and its centre cap is connected with diode D2 anode; After being connected in parallel, the diode D2 negative terminal of three groups of detector F is connected with potentiometer W2 one end of trigger G; Rectifier D1 can adopt full-wave rectification, also can adopt halfwave rectifier, therefore; The effect of detector F is to become direct control signal to the alternating current impression signal voltage transitions of instrument transformer T input; Embodiment rectifier D1 is the full-wave rectifying circuit that adopts 4 2CP type diodes to form, and three diode D2 adopt 2CP type pipe equally, is used for detecting F to every group and plays buffer action; And the control signal while input trigger G of every group of detector F output, potentiometer W1 is used for regulating the size of control signal output.

Be connected with coil L one end of protection switch K2 after the other end of the potentiometer W2 of trigger G and the centre cap parallel connection with after the control utmost point b parallel connection of the potentiometer W3 other end and unidirectional or bidirectional triode thyristor D3; Coil L other end ground connection; Input utmost point a unidirectional or bidirectional triode thyristor D3 is connected with the output of time-delay DC power supply E, and potentiometer W2 is used for regulating the size of triggering signal, and potentiometer W3 is used for keeping conducting unidirectional or bidirectional triode thyristor D3; Bonding to or the reliable conducting of bidirectional triode thyristor D3 or end; Embodiment potentiometer W1, W2, W3 all adopt commercially available general solid potentiometer, after its parameter is dispatched from the factory and adjusted, generally do not need adjustment.The output voltage size of time-delay DC power supply E is selected according to the operating voltage of the coil L of protection switch K2.Its model of the one-way SCR D3 that embodiment adopts is selected 3CT series pipe.Protection switch K2 selects the JAG4H type dry-reed relay device of normally-closed contact for use, when coil L passes through electric current, and protection switch K2 contact adhesive; Make its disconnection; Thereby make three bidirectional triode thyristor BG1,2,3 control loop open circuit, it is ended, load D breaks off the three phase supply power supply.

The utility model action principle is following: when control switch K1 connected, the control loop closure of three bidirectional triode thyristor BG1, BG2, BG3 made its conducting, and load D connects the three-dimensional power supply; Regulator potentiometer W1, W2, W3 parameter; The alternating current impression signal voltage that instrument transformer T is produced can not trigger unidirectional or bidirectional triode thyristor D3 conducting, and no current passes through among the coil L of protection switch K2, therefore; Protection switch K2 is failure to actuate the contact, keeps load D and normally moves work.

When occurring fault such as overload, short circuit, overvoltage, the phase failure in load or the electrical network, at this moment arbitrary electric current through instrument transformer T mutually increases, and the alternating current impression signal voltage that is input to detector F is also increased; The triggering signal of conversion also increases; At this moment trigger unidirectional or both sides' controllable silicon D3 conducting, the time-delay DC power supply E provide protection switch K2 coil L an operating current, makes protection switch K2 contact adhesive open circuit; Break off the control loop of three bidirectional triode thyristor BG1, BG2, BG3; It is ended, and load D breaks off the three-dimensional power supply, reaches protective effect.

Because load D is generally inductive load, moment starting current bigger, do not produce misoperation for making the utility model start moment at load D; Therefore; Adopt time-delay DC power supply E that the voltage of protection switch K2 coil L is provided, after load D started for 2 to 3 seconds, time-delay DC power supply E ability output dc voltage inputed to the input a of one-way SCR D3; Any two phases in the time-delay DC power supply E input termination three phase supply electricity power supply, its break-make is operated by control switch K1.

Claims

1. three phase power noncontacting switch protector; Form by control switch K1, three bidirectional triode thyristor BG1, BG2, BG3 and time-delay DC power supply E; It is characterized in that: it is made up of three instrument transformer T, three groups of detector F, trigger G and protection switch K2; Wherein every group of detector F is made up of rectifier D1, potentiometer W1, diode D2; Unidirectional or bidirectional triode thyristor D3 constitutes trigger G by two potentiometer W2, W3 and one, and three input a of three bidirectional triode thyristor BG1, BG2, BG3 are connected with three-phase power line A, B, C respectively, and three output b are connected with load D after being connected in series the primary coil of three instrument transformer T respectively; Three control end e are connected with three terminals d, e, the f of control switch K1 respectively; Three terminals a, b, c in addition of control switch K1 are connected with three terminals a, b, the c of protection switch K2 respectively, and three terminals d, e, f in addition of protection switch K2 are connected with the input a of three bidirectional triode thyristor BG1, BG2, BG3 respectively, and the secondary coil of each instrument transformer T is connected with the rectifier D1 input of every group of detector F respectively; Its output is connected with potentiometer W1 two ends; Potentiometer W1 one end ground connection wherein, potentiometer W1 centre cap is connected with diode D2 anode, and the diode D2 negative terminal of the three groups of detector F back that is connected in parallel is connected with potentiometer W2 one end of trigger G; Be connected with potentiometer W3 one end after the other end of potentiometer W2 and the centre cap parallel connection; Potentiometer W3 one end also is connected with its centre cap, unidirectional or bidirectional triode thyristor D3 control utmost point e, is connected the other end ground connection of coil L with coil L one end of protection switch K2 after the output stage b parallel connection of the other end of potentiometer W3 and unidirectional or bidirectional triode thyristor D3; Input utmost point a unidirectional or bidirectional triode thyristor D3 is connected any two phases of its input termination three-phase alternating-current supply with the output of time-delay DC power supply E.