CN201262926Y

CN201262926Y - Electric-controlled type circuit breaker with short circuit self-locking function

Info

Publication number: CN201262926Y
Application number: CNU2008201901931U
Authority: CN
Inventors: 万家盛; 汪志强
Original assignee: Hubei Shengjia Wiring Co Ltd
Current assignee: Hubei Shengjia Wiring Co Ltd
Priority date: 2008-08-12
Filing date: 2008-08-12
Publication date: 2009-06-24
Anticipated expiration: 2018-08-12

Abstract

The utility model relates to an electrically controlled circuit breaker with a self-lock function during the short circuit, which is characterized in that: a self-lock mechanism during the short circuit is arranged in the circuit breaker, so the circuit breaker can not be closed directly when being disconnected due to the short circuit, so as to remind the operators of the short circuit. As a result, the operators can reclose the circuit breaker only after identifying the causes and solving the problems. Under the condition of keeping all functions of the original circuit breakers, the mechanical circuit breaker with the self-lock function during the short circuit is additionally provided with the self-lock function during the short circuit, thus overcoming the defects in the prior art such as burnout of the circuit breakers or fire caused by the reclosing of the circuit breaker after short circuit.

Description

Electric-controlled type has the circuit breaker of short circuit self-locking function

Technical field

The utility model belongs to a kind of low-voltage electrical apparatus, is the circuit breaker that a kind of electric-controlled type has short circuit self-locking function specifically.

Background technology

Mainly be to constitute (Fig. 1) at the circuit breaker (being commonly called as air switch) that uses at present by shell, operating grip, self-locking gangbar, dropout linkage, movement arm and operating point (contact), its course of work is: the manipulation operations handle makes the self-locking gangbar drive the movement arm motion, the contact is linked to each other with the sheet metal of output finish the switch closure process, the gangbar of self-locking simultaneously cooperates with the dropout linkage finishes closed self-locking (Fig. 2).For circuit is protected, in existing circuit breaker, also be provided with overcurrent action Agency And sheet metal protection mechanism, its course of work is: when the electric current that flows through circuit breaker surpasses the current ratings certain value, the lower end that overcurrent coil in the overcurrent actuating mechanism makes the actuating strut action of overcurrent actuating mechanism push the dropout linkage is rotated the dropout linkage, the self-locking gangbar breaks away from the dropout linkage and finishes the circuit breaker disconnection, reaches the purpose of protection; The course of work of bimetal leaf protection mechanism is: when the electric current that flows through circuit breaker surpasses the current ratings certain value; make bi-metal plate deformed and touch the rotation of dropout linkage; the self-locking gangbar breaks away from the dropout linkage and finishes the circuit breaker disconnection, reaches the purpose of protection.But; after circuit breaker disconnects; the actuating strut of its overcurrent actuating mechanism or bimetallic sector-meeting recover reset condition; when if load is short-circuited; though above-mentioned circuit breaker can be finished overcurrent protection, still exist need not to find out circuit breaker disconnect cause (because operating personnel do not know the overcurrent protection short circuit) close circuit breaker once more, to such an extent as to burn circuit breaker or cause the defective of fire; this class accident of picture has repeatedly seen medium.

Summary of the invention

The purpose of this utility model provides a kind of when circuit is short-circuited, after circuit breaker disconnects, must carry out reset operation (is short circuit to remind the operator) again the electric-controlled type of close circuit breaker have the circuit breaker of short circuit self-locking function, to overcome the defective of burning circuit breaker in the prior art or causing fire.

To achieve these goals, the utility model is provided with short-circuit self-locking mechanism in circuit breaker, short-circuit self-locking mechanism comprises self-locking mechanism and resetting device, its self-locking mechanism is the mechanism that control dropout linkage keeps the overcurrent protection state, its resetting device is to make the dropout linkage recover the mechanism of reset condition, be characterized in: self-locking mechanism is made of electromagnet, a control circuit for electromagnet that is arranged in the case for circuit breaker, and electromagnet is connected with the control circuit for electromagnet line; Resetting device is connected and composed by a shift knob and control circuit for electromagnet line, and wherein the movement arm of electromagnet contacts with the upper end of dropout linkage in the circuit breaker.

Above-mentioned control circuit for electromagnet is by tongue tube and tongue tube is automatically controlled constitutes from lock control circuit, and electromagnet is connected from the lock control circuit line with automatically controlled with tongue tube, and tongue tube is arranged on by the circuit breaker inside conductor.

Above-mentioned control circuit for electromagnet is made of transducer and the automatically controlled self-locking control circuit of transducer, and transducer passes the circuit breaker inside conductor, and the output of transducer is connected from lock control circuit with automatically controlled.

Because the utility model is provided with short-circuit self-locking mechanism in circuit breaker, make the utility model after the circuit breaker that is short-circuited disconnects phenomenon, direct close circuit breaker, reminding operator's accident that is short-circuited, close circuit breaker again after should ascertaining the reason and deal with problems.The utility model has increased short circuit self-locking function keeping under the situation of original circuit breaker all functions, thus overcome in the prior art because of after the short circuit again close circuit breaker cause the defective of burning circuit breaker or causing fire.

Description of drawings

Fig. 1 is present circuit breaker off-state structural representation.

Fig. 2 is present breaker closing status architecture schematic diagram.

Fig. 3 is the utility model embodiment 1 closure state structural representation.

Fig. 4 is the utility model embodiment 1 self-locking state structural representation.

Fig. 5 is the utility model embodiment 2 closure state structural representations.

Fig. 6 is the utility model embodiment 2 self-locking state structural representations.

Fig. 7 is the stereogram of the utility model embodiment 2.

Fig. 8 is that the utility model tongue tube is automatically controlled from the lock control circuit schematic diagram.

Fig. 9 is the automatically controlled self-locking control circuit of a utility model transducer schematic diagram.

Among the figure: 1-shell, 2-operating grip, 3-self-locking gangbar, 4-dropout linkage, 5-overcurrent actuating mechanism, 6-bimetal leaf, 7-movement arm, 8-operating point, 9-shift knob, 10-electromagnet, 11-electromagnet movement arm, 12-tongue tube, 13-instrument transformer, 14-control circuit.

Embodiment

Below in conjunction with drawings and Examples the utility model is described in further detail.

The utility model is under the situation that keeps former breaker structure constant (all functions are constant); a short-circuit self-locking mechanism is set in circuit breaker in addition to be constituted; short-circuit self-locking mechanism comprises self-locking mechanism and resetting device; its self-locking mechanism is the mechanism that control dropout linkage keeps the overcurrent protection state, and its resetting device is to make the dropout linkage recover the mechanism of reset condition.

Embodiment 1:

Self-locking mechanism of the present utility model is arranged on by one that electromagnet, tongue tube and tongue tube in the case for circuit breaker is automatically controlled to be constituted from lock control circuit (Fig. 8), electromagnet is connected from the lock control circuit line with automatically controlled with tongue tube, resetting device is made of a shift knob, tongue tube is arranged on by the circuit breaker inside conductor, wherein the movement arm of electromagnet contact with the upper end of dropout linkage in the circuit breaker (Fig. 3).

The operation principle of present embodiment is: when circuit breaker is short-circuited, owing to be much higher than the rated current of circuit breaker by the electric current in the circuit breaker inside conductor, produce high-intensity magnetic field around the lead, make the other tongue tube adhesive of lead, tongue tube is automatically controlled from lock control circuit work, magnet spool gets, the movement arm action of electromagnet, movement arm promotes the dropout linkage and rotates (circuit breaker being disconnected with the overcurrent actuating mechanism), and remain on trip status and can not recover, thereby make both to have made the closed procedure handle, can not make breaker closing, and finish short circuit self-locking (Fig. 4).Recovery operation if desired only need press the button, makes automatically controlledly to quit work from lock control circuit work, and the magnet spool outage, the movement arm of electromagnet recovers, and the gangbar of promptly threading off is recovered, and just closed procedure handle once more makes breaker closing.

Embodiment 7:

Self-locking mechanism of the present utility model is made of an automatically controlled self-locking control circuit of electromagnet, transducer and transducer (Fig. 9) that is arranged in the case for circuit breaker, resetting device is made of a shift knob, transducer passes the circuit breaker inside conductor, the output of transducer is connected from lock control circuit with automatically controlled, wherein the movement arm of electromagnet contact with the upper end of dropout linkage in the circuit breaker (Fig. 5).

From the circuit theory diagrams difference of lock control circuit, other principles are identical with embodiment 1 except that automatically controlled for the operation principle of present embodiment.

The utility model tongue tube automatically controlled from lock control circuit (Fig. 8) by power circuit, comparison circuit, short-circuit detecting circuit, latching circuit, reset circuit and controlling output circuit constitute, its power circuit is by diode D1-D4, resistance R 1, RB2, R3, capacitor C 1, integrated circuit (IC) 1 is formed, comparison circuit is by resistance R 4, R5, variable resistor W integrated circuit (IC) 2 is formed, short-circuit detecting circuit is made up of tongue tube NS, latching circuit is made up of diode D6, reset circuit is made up of sensitive switch REST, and controlling output circuit is by capacitor C 3, resistance R 6, triode Q, diode D5, electromagnet coil XQ forms.When circuit is short-circuited fault, around conductor, can produce powerful magnetic field, tongue tube NS is by the adhesive conducting, voltage is input to the in-phase input end of comparison circuit through dry reed tube NS and the reference voltage of comparison circuit inverting input compares, the output high potential drives triode Q conducting, this high potential makes the circuit self-locking by the in-phase input end that diode D6 feeds back to comparator simultaneously, all the time be in high potential state, the electromagnet action promotes transmission mechanism threads off switch, cut off the electricity supply, have only by pressing the REST switch to make the output of comparator become electronegative potential, triode is failure to actuate by electromagnet, and circuit breaker could close a floodgate.

The automatically controlled self-locking control circuit of the utility model transducer (Fig. 9) is by power circuit, comparison circuit, short-circuit detecting circuit, latching circuit, release circuit and controlling output circuit constitute, its power circuit is by diode D1-D4, resistance R 1, RB2, R3, capacitor C 1, integrated circuit (IC) 1 is formed, comparison circuit is by resistance R 4, R5, variable resistor W integrated circuit (IC) 2 is formed, short-circuit detecting circuit is by transducer TA, capacitor C 2 diode D7 form, latching circuit is made up of diode D6, release circuit is made up of sensitive switch REST, and controlling output circuit is by capacitor C 3, resistance R 6, triode Q, diode D5, electromagnet coil XQ forms.Its principle is: when circuit is short-circuited fault, sensor sensing goes out voltage through the reference voltage comparison with the comparison circuit inverting input of the in-phase input end that is input to comparison circuit behind the diode rectification, the output high potential drives triode Q conducting, this high potential makes the circuit self-locking by the in-phase input end that diode D6 feeds back to comparator simultaneously, all the time be in high potential state, the electromagnet action promotes transmission mechanism threads off switch, cut off the electricity supply, having only by pressing the REST switch makes the output of comparator become electronegative potential, triode is failure to actuate by electromagnet, and circuit breaker could close a floodgate.

The utility model also can be set to conventional overcurrent by short circuit current, finishes the overcurrent self-locking, makes the utility model be transformed into a kind of circuit breaker with overcurrent self-locking function.

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 electric-controlled type has the circuit breaker of short circuit self-locking function, in circuit breaker, be provided with short-circuit self-locking mechanism, short-circuit self-locking mechanism comprises self-locking mechanism and resetting device, self-locking mechanism is the mechanism that control dropout linkage keeps the overcurrent protection state, its resetting device is to make the dropout linkage recover the mechanism of reset condition, it is characterized in that: self-locking mechanism is made of electromagnet, a control circuit for electromagnet that is arranged in the case for circuit breaker, and electromagnet is connected with the control circuit for electromagnet line; Resetting device is connected and composed by a shift knob and control circuit for electromagnet line, and wherein the movement arm of electromagnet contacts with the upper end of dropout linkage in the circuit breaker.

2, electric-controlled type as claimed in claim 1 has the circuit breaker of short circuit self-locking function, it is characterized in that: control circuit for electromagnet is by tongue tube and tongue tube is automatically controlled constitutes from lock control circuit, electromagnet is connected from the lock control circuit line with automatically controlled with tongue tube, and tongue tube is arranged on by the circuit breaker inside conductor.

3, electric-controlled type as claimed in claim 1 has the circuit breaker of short circuit self-locking function, it is characterized in that: control circuit for electromagnet is made of transducer and the automatically controlled self-locking control circuit of transducer, transducer passes the circuit breaker inside conductor, and the output of transducer is connected from lock control circuit with automatically controlled.

4, electric-controlled type as claimed in claim 2 has the circuit breaker of short circuit self-locking function, it is characterized in that: tongue tube automatically controlled from lock control circuit by power circuit, comparison circuit, short-circuit detecting circuit, latching circuit, reset circuit and controlling output circuit constitute, its power circuit is by diode D1-D4, resistance R 1, RB2, R3, capacitor C 1, integrated circuit (IC) 1 is formed, comparison circuit is by resistance R 4, R5, variable resistor W integrated circuit (IC) 2 is formed, short-circuit detecting circuit is made up of tongue tube NS, latching circuit is made up of diode D6, reset circuit is made up of sensitive switch REST, and controlling output circuit is by capacitor C 3, resistance R 6, triode Q, diode D5, electromagnet coil XQ forms.

5, electric-controlled type as claimed in claim 3 has the circuit breaker of short circuit self-locking function, it is characterized in that: the automatically controlled self-locking control circuit of transducer is by power circuit, comparison circuit, short-circuit detecting circuit, latching circuit, release circuit and controlling output circuit constitute, its power circuit is by diode D1-D4, resistance R 1, RB2, R3, capacitor C 1, integrated circuit (IC) 1 is formed, comparison circuit is by resistance R 4, R5, variable resistor W integrated circuit (IC) 2 is formed, short-circuit detecting circuit is by transducer TA, capacitor C 2 diode D7 form, latching circuit is made up of diode D6, release circuit is made up of sensitive switch REST, and controlling output circuit is by capacitor C 3, resistance R 6, triode Q, diode D5, electromagnet coil XQ forms.