CN2260396Y

CN2260396Y - AC load protector

Info

Publication number: CN2260396Y
Application number: CN 96208151
Authority: CN
Inventors: 王彦峰
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-04-12
Filing date: 1996-04-12
Publication date: 1997-08-20
Anticipated expiration: 2006-04-12

Abstract

The utility model belongs to an emergency protection device, relating to an AC load protector. A control loop of the protector still takes a mutual inductor as a main body; a photoelectric component is arranged to control a bidirectional thyristor and an AC contactor in an electronic switch circuit. The electronic switch loop is also provided with two normally closed and normally open push buttons to conveniently use the protector. Each component of the utility model has reasonable layout; the normal work of loads can be effectively protected without a synchronous switch. The utility model has the characteristics of small power consumption of the protector, small volume, simple structure, low cost, etc.

Description

A kind of AC load protector

The utility model belongs to emergency protective device, is a kind of AC load protector.

More powerful at present three-phase alternating current load in use often need be disposed all kinds of emergency protective devices, in case damage AC load when preventing from line fault to occur.As more powerful three-phase alternating-current motor when mounted except that other auxiliary security protectors; polygamy is put a certain phase that prevents three characteristics of the middle term power line in the course of the work or two-phase circuit and is hindered for some reason and make the excessive automatic protector that burns motor windings of operating current; this common class protector has " passive protector " and magnetoelectricity controller etc.; its basic principle all is to utilize electromagnetic induction principle; utilize the electric pulse of the instrument transformer power line that certain bar electric current is excessive to reach circuit in the protector, play a protective role thereby utilize various contactors or electromagnet that motor winding and power line are opened circuit again.But these several protectors all in various degree to exist required instrument transformer more, must the configuration synchronization switch and reactive loss bigger, the more high deficiency of manufacturing cost.

The purpose of this utility model is to provide a kind of AC load protector; the control loop of this protector still be with the instrument transformer main configuration photoelectric component in order to bidirectional triode thyristor and A.C. contactor in the control electronic switch loop, the electronic switch loop also dispose two normally closed, often drive button and can use this protector easily.To overcome the existing in prior technology deficiency.

Overall structure of the present utility model is:

A kind of circuit of AC load protector is that the master constitutes by control loop, electronic switch loop, and the hand switch device in the circuit, binding post potentiometer are installed on the perisporium of box body, and control loop (1) is by instrument transformer winding L, potentiometer W, photo resistance R ₁, capacitor C and light-emitting diode D ₂Formation parallel with one another, light-emitting diode D ₁Contiguous photosensitive resistance R ₁, and be connected between the E point in the movable end of potentiometer W and this loop, electronic switch loop (2) comprise by the winding of A.C. contactor J, normally open push button switch K ₁, normally closed push button switch K ₂Connects the series circuit of formation after connecting successively more respectively with two AC power cord, and be connected across between G, the F point of this series circuit bidirectional triode thyristor pipe S and respectively with the control utmost point of bidirectional triode thyristor pipe, the photo resistance R that negative pole connects ₂, three normally opened contact K switch of A.C. contactor J are connected in respectively in the circuit of three-phase power line A, B, C and load; Potentiometer W, button switch K are installed on the perisporium of box body (3) ₁, K ₂, the instrument transformer winding L that has iron core in the box body is positioned near at least one induction hole (5) on the box side wall face (4).

The architectural feature of instrument transformer winding L is:

The line of instrument transformer winding L directly is φ 0.3-0.5, and the number of turn is 40-80.

Accompanying drawing of the present utility model has:

Fig. 1 is the circuit diagram of protector

Fig. 2 is the box body dimension sketch of protector.

Accompanying drawing has provided embodiment of the present utility model; further specify as follows in conjunction with the accompanying drawings: this protector is because used electronic devices and components are less; therefore the specification of its box body (3) is about to 80mm, the wide 40mm of being about, height and is about 60mm; toggle switch K on each perisporium of box body, binding post G, F, the layout of potentiometer W knob (6) and three induction holes (5) as shown in Figure 2.Wherein G, F are binding post, and toggle switch K ' is provided with for ease of enlarging this protector function.

Press K ₁Button does not break down as A, B, three power lines of C, then light-emitting diode D ₁(TLR _102-105) not luminous, D ₂(TLR _102-105) luminous, bidirectional triode thyristor pipe (TLC ₃₃₆H-F) be in conducting state, each corresponding windings energising of A.C. contactor makes pairing separately three normal open switch closures, and motor runs well.

If winding L close power line open circuit, non-inductive electric current or diminish in this moment inductor winding L, the bidirectional triode thyristor pipe has lost trigger voltage naturally and has ended, and then A.C. contactor winding L no current is in off-state by three normal open switch K, and motor is not worked.Break down (removing winding L near one) if having one in three power lines, then cause instrument transformer institute to increase near a power line electric current, the electric current of being responded to by winding L is also bigger, light-emitting diode D ₁Luminous, the photo resistance resistance is reduced to thereupon and causes short circuit, light-emitting diode D ₂Lose voltage and extinguish photo resistance R ₂The resistance increase causes the bidirectional triode thyristor pipe to end, contactor winding decompression, and pairing three K switch disconnect, and motor also quits work.

The obtained technological progress of the utility model is:

Because the winding L of this AC load protector transformer and the configuration of photoelectric component are closed Reason does not need synchro switch and three transformer windings also can play the high power AC load Effectively protective effect, not only decrease the energy that causes because disposing similar protector Consumption, and used electronic devices and components are less, simple in structure, can make the box body of this protector Little, low cost of manufacture. So it is simple in structure that this AC load protector has, the overload protection merit Can the characteristics such as by force and components and parts are easy to apolegamy and volume is little, cost is low.

Claims

1, a kind of AC load protector; by control loop, electronic switch loop is that the master constitutes; hand switch device, binding post potentiometer in the circuit are installed on the perisporium of box body, it is characterized in that control loop (1) is by instrument transformer winding L, potentiometer W, photo resistance R ₁, capacitor C and light-emitting diode D ₂Formation parallel with one another, light-emitting diode D ₁Contiguous photosensitive resistance R ₁, and be connected between the E point in the movable end of potentiometer W and this loop, electronic switch loop (2) comprise by the winding of A.C. contactor J, normally open push button switch K ₁, normally closed push button switch K ₂Connects the series circuit of formation after connecting successively more respectively with two AC power cord, and be connected across between G, the F point of this series circuit bidirectional triode thyristor pipe S and respectively with the control utmost point of bidirectional triode thyristor pipe, the photo resistance R that negative pole connects ₂, three normally opened contact K switch of A.C. contactor J are connected in respectively in the circuit of three-phase power line A, B, C and load; Potentiometer W, button switch K are installed on the perisporium of box body (3) ₁, K ₂, the instrument transformer winding L that has iron core in the box body is positioned near at least one induction hole (5) on the box side wall face (4).

2, protector according to claim 1 is characterized in that the line of instrument transformer winding L directly is φ 0.3-0.5, and the number of turn is 40-80.