CN2052974U

CN2052974U - Three phase power contactless switch protector

Info

Publication number: CN2052974U
Application number: CN 89206270
Authority: CN
Inventors: 付建忠
Original assignee: Individual
Current assignee: Individual
Priority date: 1989-04-27
Filing date: 1989-04-27
Publication date: 1990-02-14

Abstract

The utility model discloses a three phase power contactless switch protector, which is mainly composed of a mutual inductor, a detector, a trigger, a protective switch, a control switch, a bidirectional thyristor and a time-delay dc power supply. The utility model can perform protective the function of overload, excess voltage, short-circuit, loss of phase of electric equipment or an electric network, rotation-blocking and short-circuit between turns of a motor, etc. Besides, the three phase power contactless switch protector has the advantages of simple structure, fast and sensitive protective action, small size and low cost, so the utility model is an ideal three phase power contactless switch protective device.

Description

Three phase power contactless switch protector

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.

A kind of three phase power contactless electronic beam switch device is disclosed in the China Patent No. 87309602, contactless in this switching device 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, saved the non-ferrous metal and the contact precious metal that need when making contact switch simultaneously in a large number, so economically valuable.But this switching device it adopt bidirectional triode thyristor to finish 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 work is unreliable dangerous.

The purpose of this utility model is to avoid weak point in the above-mentioned prior art and a kind of safe and reliable three phase power noncontacting switch protector is provided, and can finish the protective effect 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.

The utility model purpose is achieved in that it is by 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 form; wherein every group of detector F is by rectifier D1; potentiometer W1; diode D2 constitutes; trigger G is by two potentiometer W2; W3 and a unidirectional or bidirectional triode thyristor D3 formation; three bidirectional triode thyristor BG1; BG2; three input a of BG3 respectively with three-phase power line A; B; C connects; 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 respectively with three terminals d of control switch K1; e; f connects; control switch K1 is three terminals a in addition; b; c respectively with three terminals a of protection switch K2; b; c connects; three terminals d in addition of protection switch K2; e; f respectively with three bidirectional triode thyristor BG1; BG2; the input a of BG3 connects; 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 one end ground connection wherein; potentiometer W1 centre cap is connected with diode D2 anode; after being connected in parallel, the negative terminal of the diode D2 of three groups of detector F 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 with its centre cap; be connected with coil L one end of protection switch K2 after the output stage b parallel connection of unidirectional or bidirectional triode thyristor D3; coil L other end ground connection; input stage a unidirectional or bidirectional triode thyristor D3 is connected with the output of time-delay DC power supply E; any two-phase of its input termination three-phase alternating-current supply; instrument transformer T can adopt E font or annular core simultaneously; its primary coil is 1 to 200 circle, and secondary coil is 800 to 3000 circles.

The utility model has following advantage compared to existing technology: 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; the utility model is simple in structure simultaneously, volume is little, cost is low; being easy for installation and maintenance, is a kind of desirable three phase power noncontacting switch protector.

Below with reference to accompanying drawing the utility model is described in further detail.

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

With reference to Fig. 1; 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 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, b, c of control switch K1 are connected with three terminals a, b, the c of protection switch K2 respectively, and other three terminals d, e of protection switch K2, f are connected with three bidirectional triode thyristor BG1,2,3 input a respectively.Three two-way phase controllable silicon BG1 of embodiment, BG2, BG3 adopts 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 of the size of plastic casing, wide 35 millimeters, high 30 millimeters, when mobile magnetic NS when the magnetic switch, control switch K1 connects, as magnetic NS during away from magnetic switch, control switch K1 disconnects.

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 thereon to be made, the primary coil winding is that 1 to 200 circle, secondary coil winding are 800 to 3000 circles, embodiment instrument transformer T adopts E font silicon steel sheet, and 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, potentiometer W1 one end ground connection wherein, 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 that the alternating current impression signal voltage transitions of instrument transformer T input is become dc control signal, embodiment rectifier D1 is the full-wave rectifying circuit that adopts 4 2CP type diodes to form, three diode D2 adopt 2CP type pipe equally, be used for every group of detector F played 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.

After the other end of the potentiometer W2 of trigger G and the centre cap parallel connection with an end and the centre cap of potentiometer W3; the control utmost point e of unidirectional or bidirectional triode thyristor D3 also connects; be connected with coil L one end of protection switch K2 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; potentiometer W2 is used for regulating the size of triggering signal; 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 adopts commercially available general solid potentiometer; after its parameter is dispatched from the factory and adjusted, generally do not need to adjust again.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 disconnects the three phase supply power supply.

The utility model action principle is as follows: when control switch K1 connects; the control loop closure of three bidirectional triode thyristor BG1, BG2, BG3 makes its conducting; 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 faults such as overload, short circuit, overvoltage, the phase failure in load or the electrical network; at this moment arbitrary electric current that passes through instrument transformer T mutually increases; 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 bidirectional triode thyristor D3 conducting; the time-delay DC power supply E provide protection switch K2 coil L an operating current; make protection switch K2 contact adhesive open circuit; disconnect the control loop of three bidirectional triode thyristor BG1, BG2, BG3; it is ended; load D disconnects the three-dimensional power supply, reaches protective effect.

Because load D is generally inductive load; moment, starting current was 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-phase in the time-delay DC power supply E input termination three phase supply power supply, its break-make is operated by control switch K1.

The utility model is except that control switch K1, all the other components and parts all are installed on 200 millimeters of block lengths, the wide 180 millimeters printed circuit board, printed circuit board (PCB) is installed in long 250 millimeters, the high 90 millimeters cabinet, the input and output terminals of three-phase power line are installed on machine shell panel, control switch K1 is connected with circuit in the printed board by external wire and draws casing, be convenient to user's remote operation control, also can be installed on the machine shell panel simultaneously, operate control.

Claims

1; a kind of by control switch K1; three bidirectional triode thyristor BG1; BG2; the three phase power noncontacting switch protector that BG3 and time-delay DC power supply E form; it is characterized in that it is by three instrument transformer T; three groups of detector F; trigger G and protection switch K2 form; wherein every group of detector F is by rectifier D1; potentiometer W1; diode D2 constitutes; trigger G is by two potentiometer W2; W3 and a unidirectional or bidirectional triode thyristor D3 formation; three bidirectional triode thyristor BG1; BG2; three input a of BG3 respectively with three-phase power line A; B; C connects; 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 respectively with three terminals d of control switch K1; e; f connects; three terminals a in addition of control switch K1; b; c respectively with three terminals a of protection switch K2; b; c connects; three terminals d in addition of protection switch K2; e; f respectively with three bidirectional triode thyristor BG1; BG2; the input a of BG3 connects; 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; 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; 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 with its centre cap; unidirectional or bidirectional triode thyristor D3 control utmost point e connects; be connected 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; the other end ground connection of coil L; input utmost point a unidirectional or bidirectional triode thyristor D3 is connected any two-phase of its input termination three-phase alternating-current supply with the output of time-delay DC power supply E.

2, according to the described three phase power noncontacting switch of claim protector, it is characterized in that instrument transformer T can adopt E font or annular core, its primary coil is 1 to 200 circle, secondary coil is 800 to 3000 circles.