CN203192723U

CN203192723U - Undervoltage release device for circuit breaker

Info

Publication number: CN203192723U
Application number: CN 201320146900
Authority: CN
Inventors: 冯书菊
Original assignee: Jiangsu Daqo High Voltage Switchgear Co Ltd
Current assignee: Jiangsu Daqo High Voltage Switchgear Co Ltd
Priority date: 2013-03-27
Filing date: 2013-03-27
Publication date: 2013-09-11
Anticipated expiration: 2023-03-27

Abstract

The utility model relates to an under-voltage trip gear for breaker and belongs to the technical field of electrical equipment. The trip gear comprises an under-voltage release loop, a closing loop and an auxiliary switch. The under-voltage release loop comprises a first bridge type rectifier, a second bridge type rectifier and a release mechanism with under-voltage coil; an under-voltage electromagnet with a microswitch is connected between the anode and the cathode of the second bridge type rectifier; the microswitch has a first normally-closed point and a first normally-open point; an under-voltage coil and a capacitance are in parallel connection between the anode and the cathode of the first bridge type rectifier; the under-voltage coil is also in series connection with the first normally-closed point and a second normally-open point of the auxiliary switch; the closing loop comprises a third bridge type rectifier; and a first branch and a second branch are in parallel connection between the anode and the cathode of the third bridge type rectifier. The utility model has advantages of simple structure, convenience for assembling and good safety performance.

Description

Circuit breaker undervoltage tripping device

Technical field

The utility model relates to a kind of circuit breaker undervoltage tripping device, is particularly useful for 6kV-35kv vacuum circuit-breaker decompression or undervoltage tripping protection are belonged to the power supply unit technical field.

Background technology

All kinds of power consumption equipments have different rated voltages and the scope range of the fluctuation of voltage of permission, and under voltage may cause production efficiency low, influences normal life, even burn-down of electric motor (time is when longer), cause accidents such as large-area power-cuts.

Be the damage that makes load appliance below the circuit breaker or electric equipment avoid under voltage, in using electricity system protection when the certain voltage drop of supply voltage generation in the protected circuit, requiring circuit breaker to disconnect cuts off the electricity supply, namely require circuit breaker to have following function: when supply voltage descends (even slowly descending) in 70% to 35% scope of device for under-voltage releasing equipment rated operational voltage, circuit breaker palpus separating brake; Equal 35% o'clock of release rated operational voltage at supply voltage, circuit breaker can not close a floodgate; When supply voltage is equal to or greater than the rated operational voltage of 85% under-voltage release, under hot condition, should be able to guarantee that circuit breaker is reliably closed.

The utility model content

The purpose of this utility model is: the problem at above-mentioned prior art exists proposes a kind of security performance circuit breaker undervoltage tripping device good, simple in structure, that be convenient to assemble.

In order to reach above purpose, the technical solution of the utility model is as follows:

A kind of circuit breaker undervoltage tripping device comprises undervoltage tripping loop, closing circuit and auxiliary switch; It is characterized in that described undervoltage tripping loop comprises first, second bridge rectifier in parallel with the circuit breaker power supply, and the tripping mechanism with under-voltage coil; Be electrically connected with the under-voltage electromagnet with sensitive switch between the both positive and negative polarity of described second bridge rectifier, described sensitive switch has the first normally closed point and first and often makes war; Described under-voltage coil and electric capacity are parallel between the both positive and negative polarity of first bridge rectifier, and described under-voltage coil is also connected with second normal battle that the first normally closed point, the auxiliary switch of sensitive switch have;

Described closing circuit comprises the 3rd bridge rectifier with circuit breaker electric subject string connection, be parallel with first branch road and second branch road between the both positive and negative polarity of described the 3rd bridge rectifier, first of the second normally closed point that described first route auxiliary switch has, sensitive switch often made war, reached the closing coil series connection and constitute, and the 3rd normal battle that described second route auxiliary switch has and first resistance are connected and constituted;

Described auxiliary switch has second normal the battle and the 3rd normal disconnection and the second normally closed closed gate-dividing state of making war, and second normal the battle and the 3rd "on" position that normal battle is closed and the second normally closed point disconnects; Described sensitive switch has under-voltage electromagnet and gets that the first normally closed point disconnects and the first normal closed channel status of making war when electric, and the dissengaged positions of the first normally closed closed and first normal disconnection of making war during under-voltage electromagnet dead electricity; Attonity state when described tripping mechanism has under-voltage coil losing electricity, and under-voltage coil gets and promotes the trip status that the dropout semiaxis makes the auxiliary switch separating brake when electric.

After adopting this structure, can cut off closing circuit in the undervoltage tripping loop during under-voltage or decompression, and make the auxiliary switch separating brake, make circuit breaker have higher safety performance.

The utility model further perfect technical scheme is as follows:

Preferably, described undervoltage tripping loop also comprises second resistance of connecting with the shunt circuit of electric capacity and under-voltage coil, the piezo-resistance in parallel with electric capacity, and the 3rd resistance of connecting with under-voltage electromagnet.

Preferably, described tripping mechanism comprises the shell that is wound with under-voltage coil, is provided with moving iron core in the described shell, and an end of described moving iron core links to each other with shell through elastic component.

Preferably, described closing circuit also comprises the anti-trip relay of connecting with first resistance, described anti-trip relay has jumper switch, and described jumper switch has the 3rd normally closed point that is series in first branch road, and made war for the in parallel the 4th normal battle with auxiliary switch the 3rd is normal; Described jumper switch has the normal condition that anti-trip relay is just often connected first branch road, and anti-trip relay is connected the anti-jump state of second branch road when unusual.

The utility model is simple in structure, be convenient to assembling, security performance is good.

Description of drawings

Below in conjunction with accompanying drawing the utility model is further described.

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

Fig. 2 is the structural representation of Fig. 1 embodiment.

Fig. 3 is the structural representation of Fig. 1 embodiment tripping mechanism.

Embodiment

The circuit breaker of present embodiment undervoltage tripping device as shown in Figure 1 to Figure 3, comprises undervoltage tripping loop, closing circuit and auxiliary switch QF;

The undervoltage tripping loop comprises first, second bridge rectifier V1, the V2 in parallel with the circuit breaker power supply, and tripping mechanism 4, and tripping mechanism 4 has under-voltage coil Y4; Be electrically connected with the under-voltage electromagnet Y6 with sensitive switch 1 between the both positive and negative polarity of the second bridge rectifier V2, sensitive switch 1 have first normally closed some S31 and first normal battle S32; Under-voltage coil Y4 and capacitor C are parallel between the both positive and negative polarity of the first bridge rectifier V1, under-voltage coil Y4 also with second of first normally closed some S31, the auxiliary switch QF of sensitive switch 1 often make war (61,62) connect;

Closing circuit comprises the 3rd bridge rectifier V3 with circuit breaker electric subject string connection, be parallel with first branch road and second branch road between the both positive and negative polarity of the 3rd bridge rectifier V3, the second normally closed point (13,14) of first route auxiliary switch QF, sensitive switch 1 first normal battle S32, and closing coil HQ series connection constitute, the 3rd of second route auxiliary switch QF often made war (11,12) and first resistance R, 0 series connection formation;

Auxiliary switch QF has second (61,62) and the 3rd gate-dividing state that (11,12) disconnect and the second normally closed point (13,14) is closed of often making war of often making war, and second (61,62) and the 3rd often the make war "on" position of (11,12) closure and the disconnection of the second normally closed point (13,14) of often making war;

Sensitive switch 1 have that under-voltage electromagnet Y6 gets when electric that first normally closed some S31 disconnects and first normal battle the S32 closure channel status, and the dissengaged positions of closed and first normal S32 disconnection battle of first normally closed some S31 during under-voltage electromagnet Y6 dead electricity;

Attonity state when tripping mechanism 4 has under-voltage coil Y4 dead electricity, and under-voltage coil Y4 gets and promotes the trip status that dropout semiaxis 5 makes auxiliary switch QF separating brake when electric.

In this structure, can cut off closing circuit in the undervoltage tripping loop during under-voltage or decompression, and make the auxiliary switch separating brake, make circuit breaker have higher safety performance.

Particularly, the undervoltage tripping loop also comprises second resistance R 1 of connecting with the shunt circuit of capacitor C and under-voltage coil Y4, the piezo-resistance R3 in parallel with capacitor C, the 3rd resistance R 2 of connecting with under-voltage electromagnet Y6.

Tripping mechanism 4 comprises the shell 2-1 that is wound with under-voltage coil Y4, is provided with moving iron core 2-2 in the shell 2-1, and the end of moving iron core 2-2 links to each other with shell 2-1 through elastic component 2-3.Moving iron core 2-2 retraction shell 2-1 under elastic component 2-3 effect when tripping mechanism 4 is in the attonity state, moving iron core 2-2 stretched out shell 2-1 and promotes dropout semiaxis 5 under under-voltage coil Y4 drives when tripping mechanism 4 was in trip status.

Closing circuit also comprises the anti-trip relay K0 that connects with first resistance R 0, anti-trip relay K0 has jumper switch K0, and jumper switch K0 has the 3rd normally closed point that is series in first branch road, and often makes war (11,12) the 4th normal battle in parallel with auxiliary switch QF the 3rd; Jumper switch K0 has the normal condition that anti-trip relay K0 just often connects first branch road, and anti-trip relay K0 connects the anti-jump state of second branch road when unusual.

During use, this device can an independent control loop, both can directly draw power supply from voltage transformer, also can draw power supply by the secondary power distribution cabinet.

When circuit breaker is not switched on, undervoltage tripping loop no current, under-voltage electromagnet Y6 dead electricity, sensitive switch 1 is in the closed and first normal dissengaged positions that battle, S32 disconnected of first normally closed some S31, and first branch road of closing circuit disconnects, and circuit breaker can not close a floodgate.

Behind the breaker electrifying, when circuit breaker power supply voltage just often, in the undervoltage tripping loop under-voltage electromagnet Y6 get electric, sensitive switch 1 be in that first normally closed some S31 disconnects and first normal battle the S32 closure channel status, circuit breaker can normally close a floodgate, and capacitor C begins charging simultaneously.When circuit breaker power supply voltage descends when making the under-voltage or decompression in undervoltage tripping loop, under-voltage electromagnet Y6 dead electricity, sensitive switch 1 is in the closed and first normal dissengaged positions that battle, S32 disconnected of first normally closed some S31, capacitor C begins discharge that under-voltage coil Y4 is got is electric after first normally closed some S31 closure, and the moving iron core 2-2 that drives tripping mechanism 4 promotes dropout semiaxis 5 makes auxiliary switch QF separating brake; After first normal S32 disconnection battle, circuit breaker can not close a floodgate.

In addition to the implementation, the utility model can also have other execution modes.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection range of the utility model requirement.

Claims

1. An undervoltage tripping device for a circuit breaker, comprising an undervoltage tripping circuit, a closing circuit, and an auxiliary switch; it is characterized in that, the undervoltage tripping circuit includes first and second circuits connected in parallel with the circuit breaker power supply A bridge rectifier, and a trip mechanism with an undervoltage coil; an undervoltage electromagnet with a micro switch is electrically connected between the positive and negative poles of the second bridge rectifier, and the micro switch has a first normally closed point and the first normally open point; the undervoltage coil and the capacitor are connected in parallel between the positive and negative poles of the first bridge rectifier, and the undervoltage coil is also connected with the first normally closed point of the micro switch and the auxiliary switch. The second normally open point is connected in series;

The closing circuit includes a third bridge rectifier connected in series with the circuit breaker power supply, a first branch and a second branch are connected in parallel between the positive and negative poles of the third bridge rectifier, and the first branch is connected by an auxiliary The second normally closed point of the switch, the first normally open point of the micro switch, and the closing coil are connected in series, and the second branch is composed of the third normally open point of the auxiliary switch and the first resistor connected in series;

The auxiliary switch has an opening state in which the second normally open point and the third normally open point are open and the second normally closed point is closed, and the second normally open point and the third normally open point are closed and the second normally closed point is closed. The closing state of the point is disconnected; the micro switch has a path state in which the first normally closed point is disconnected and the first normally open point is closed when the undervoltage electromagnet is energized, and the first normally closed point is closed when the undervoltage electromagnet is deenergized. The closed point is closed and the first normally open point is disconnected; the tripping mechanism has a non-action state when the undervoltage coil is de-energized, and a function of pushing the tripping half shaft to open the auxiliary switch when the undervoltage coil is energized. Trip status.

2. The undervoltage tripping device for circuit breaker according to claim 1, characterized in that, the undervoltage tripping circuit also includes a second resistor connected in series with the parallel circuit of the capacitor and the undervoltage coil, and the voltage paralleled with the capacitor Sensitive resistor, and a third resistor in series with the undervoltage solenoid.

3. The undervoltage tripping device for a circuit breaker according to claim 2, characterized in that, the tripping mechanism includes a casing wound with an undervoltage coil, and a moving iron core is arranged inside the casing, and the moving iron core One end of the elastic member is connected with the shell.

4. The undervoltage tripping device for circuit breaker according to claim 3, characterized in that, the closing circuit also includes an anti-jump relay connected in series with the first resistor, and the anti-jump relay has a jumper switch, the The jumper switch has a third normally closed point connected in series in the first branch, and a fourth normally open point connected in parallel with the third normally open point of the auxiliary switch; The normal state of the branch circuit, and the anti-jump state of the second branch circuit when the anti-jump relay is abnormal.