KR100662746B1 - Pressure trip apparatus of the circuit breaker - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure trip device for a circuit breaker for wiring, comprising: an enclosure for protecting a mechanism and a shape capable of controlling a current of each phase and discharging gas pressure to the outside, and having a space for storing pressure when assembled; A unit, a movable contactor and a fixed contactor which are assembled in the single pole blocking unit to generate gas pressure from an arc by electromagnetic repulsive force, a pressure valve for phase insulation between the units when pressure is generated in each of the single pole blocking units, and each of the single pole blocking units It is rotatably assembled to a rotation point to the outside and provided with a pressurizing part and a bar operating part, the operation bar rotating by the gas pressure discharged to the pressure outlet, a return spring for controlling the movement of the operation bar, and the rotation by the operation bar It comprises a trip bar which trips a mechanism part by doing so. In the present invention, when the short-circuit current occurs, the gas pressure in the extinguishing unit rises very rapidly due to the arc generated by the separation of the contact due to the electromagnetic repulsive force between the movable contactor and the fixed contactor assembled inside the single-pole blocking unit. When the circuit breaker for the wiring is directly tripped by rotating the trip bar that restrains the mechanism by driving the operation bar, which is assembled outside each single pole blocking unit and supported by the elastic body, it is faster than the trip process through the conventional multi-step mechanism operation. Since the mechanism trips, the arc can be cut off in a short time to reduce the breaking energy, thereby reducing the damage of the mechanism and the contacts, thereby improving the performance of the circuit breaker for wiring, and also in the mutual protection coordination of several breaking periods. The breaking action of the breaker installed at the bottom first By nadorok are thereby improving the characteristics of the selected block can be effective to protect the circuit breaker installed in the upper portion.

Description

PRESSURE TRIP APPARATUS OF THE CIRCUIT BREAKER}

1 to 4 relates to a circuit breaker for a conventional wiring,

1 is a longitudinal cross-sectional view of a circuit breaker for wiring;

2 is a perspective view of a circuit breaker for wiring;

3 and 4 are perspective views showing the configuration and operation of the circuit breaker for wiring.

5 to 10 relates to a circuit breaker for wiring employing the device of the present invention,

5 is a side view of a circuit breaker for wiring;

6 and 7 are perspective views showing circuit breakers for wiring from different directions.

8 and 9 are exploded perspective views of the main parts and side views of the main parts.

10 is a wiring diagram.

<Description of the symbols for the main parts of the drawings>

1: Enclosure 2: Single pole blocking unit

4: trip bar 10: operation bar

10a: Pressurizing section 10b: Bar operating section

11: return spring 12: shaft

13 pressure outlet 15 pressure valve

16: fixed contact 17: movable contact

The present invention relates to a pressure trip device of a circuit breaker for wiring, and in particular, by introducing a high pressure in the extinguisher generated when a short circuit current is generated to the pressure discharge space connected to each single-pole blocking unit by driving the operation bar assembled therein It relates to a pressure trip device of a circuit breaker for wiring to rotate the trip bar to trip the circuit breaker for wiring.

In general, the circuit breaker for wiring is an electrical device that protects the circuit and the load by automatically cutting off the circuit in the event of electrical overload or short circuit. The wiring breaker is a mechanism that opens and closes the terminal part to make the connection between the power supply side and the load side, and the movable contactor and the fixed contactor in the wiring breaker, and detects the occurrence of overcurrent, instantaneous current and short-circuit current at the power supply side. It consists of a trip part that induces a trip operation to cut off the power.

Therefore, the circuit breaker for wiring is to protect the load and the circuit by cutting off the abnormal current in case of abnormal current, ie, over current, instantaneous current and short circuit current between the power supply and the load.

On the other hand, when abnormal current (overcurrent, instantaneous current, short-circuit current) occurs, regardless of artificial opening and closing, it recognizes this in the circuit breaker and automatically cuts off the current. This is called a normal trip.

In the circuit of the circuit breaker, when the high short circuit current is higher than the instantaneous current in the circuit, the electrical contact repulsion force due to the Holmforce and the contact force due to the Lorentz force are generated, and the contact is opened before the switch mechanism of the breaker is operated. The high pressure gas is exhausted out by the electric arc.

1 to 4 illustrate a conventional circuit breaker, a longitudinal cross-sectional view of the circuit breaker for the wiring is shown in FIG. 1, a perspective view of the circuit breaker for the wiring is shown in FIG. 2, and FIG. 3. 4 is a perspective view showing the configuration and operation of the circuit breaker for wiring, respectively.

Single pole blocking unit (2) having an enclosure (1) for protecting the mechanism, a shape capable of controlling the current of each phase and discharge gas pressure to the outside and a space for storing the pressure when assembled, and the enclosure (1) A magnetic core 5 which is assembled inside and generates an electromagnetic force with respect to a current flowing through the circuit breaker, an armature 6 that is attracted to the magnetic core 5 due to the electromagnetic force, and the amateur 6 A crossbar 7 driven by driving of the trip bar, a trip shooter 8 driven by the crossbar 7, a spring 9 causing a driving force of the trip shooter 8, and the trip It is comprised by the trip bar 4 which trips a mechanism part by rotating by the shooter 8. As shown in FIG.

In the conventional circuit breaker as shown in FIG. 3, when the steady current flows, the trip shooter 8 is constrained by the crossbar 7 so that the trip bar 4 can maintain the reset position. The trip shooter constrained by the crossbar 7 due to the electromagnetic force of the magnetic core 5 attracting the armature 6 in the instantaneous current and the excess current as shown in FIG. 4 and the part of the armature 6 rotating the crossbar 7. The release of the locking portion of the 8) to release the restraint, the trip shooter 8 rotated by the elastic force of the spring (9) assembled in the trip shooter 8 rotates the trip bar (4), thereby 4) trips the mechanism by moving out of the reset position.

As the above-described conventional circuit breaker trips the mechanism part through a multi-step mechanism operation when a short circuit current flows, the breaking energy rapidly increases due to time delay, and excessive increase of the breaking energy increases the main body and the mechanism part of the circuit breaker. It can cause serious problems such as fusion between movable contactor and fixed contactor, especially in circuits with multiple circuit breakers, and can have a fatal effect on the selective interruption of the circuit breaker for wiring that requires the priority of the lower circuit breaker. have.

The present invention was devised to solve the above problems and defects as described above, and when the short circuit current occurs, it shortens the long trip time through the multi-step mechanism operation of the circuit breaker for wiring, which is a problem of the prior art, thereby minimizing the breaking energy and In order to prevent the inter-fusion and improve the breaking performance, the circuit breaker is tripped by using the high gas pressure generated by the arc generated when the movable contactor is lifted by the electromagnetic repulsive force in case of a short circuit accident. It is an object of the present invention to provide a pressure tripping device for a circuit breaker for wiring which can improve the reliability of the selective circuit breaker requiring the preferential operation of the lower circuit breaker in a circuit in which several circuit breakers are arranged differently.

In order to achieve the above object, the pressure trip device for a circuit breaker for wiring according to the present invention includes an enclosure for protecting a mechanism part;
A single-pole blocking unit having a shape capable of controlling the current of each phase and discharging the gas pressure to the outside, and having a space for storing the pressure when assembled;
A movable contactor and a fixed contactor which are assembled in the unipolar blocking unit to generate gas pressure from the arc due to electromagnetic repulsive force;
Pressure valves for inter-phase insulation between the single-pole blocking units when pressure is generated in the single-pole blocking units;
An operation bar rotatably assembled at a rotation point with an axis on the outside of each monopole blocking unit, and provided with a pressurizing portion and a bar operating portion and rotating by gas pressure discharged to the pressure discharge port;
A return spring for elastically pressing the operation bar to return to its original position;
And a trip bar for tripping the mechanism part by rotating by the operation bar.

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Hereinafter, with reference to the accompanying drawings, the present invention will be described in detail as follows.

5 to 10 are related to a circuit breaker for wiring employing the device of the present invention, Figure 5 is a side view of the circuit breaker for the wiring, Figure 6 and Figure 7 is a perspective view showing the wiring circuit breaker in different directions, respectively 8 and 9 show an exploded perspective view of the main part and a side view of the main part, respectively, and a wiring diagram of the main part of the present invention.

As shown in the drawing, the pressure trip device of the circuit breaker for wiring according to the present invention can store the pressure when assembled with an enclosure 1 for protecting the mechanism and a shape capable of controlling the current of each phase and discharging gas pressure to the outside. A single pole blocking unit 2 having a space therebetween, a movable contact 17 and a fixed contact 16 assembled in the single pole blocking unit 2 to generate gas pressure from an arc by electromagnetic repulsive force, and each single pole blocking unit ( 2) rotatably assembled to the rotation point 12a by the shaft 12 on the outside, and provided with a pressurizing portion 10a and a bar operating portion 10b and rotating by the gas pressure discharged to the pressure discharge port 13. It comprises a bar 10, a return spring 11 elastically pressurized to return the operation bar 10 to its original position, and a trip bar 4 for tripping the mechanism by rotating by the operation bar 10. do.

And between each of the single-pole blocking unit 2 is provided with a pressure valve 15 for preventing the phase flow of the gas pressure due to the arc to maintain the phase insulation, the return spring 11 is preferably a torsion spring (torsion spring) It consists of. Reference numerals 15a and 15b denote a pair of valve membranes to simultaneously open and close the pressure outlets 13 of the adjacent single-pole blocking units 2.

The pressure trip device of the circuit breaker for wiring by the pressure trip device of the circuit breaker as described above is connected between the fixed contact 16 and the movable contact 17 in the single-pole breaking unit 2 as shown in FIG. 5 when a short circuit current flows. The arc is generated as indicated by the symbol "A" due to the separation of the two contacts by the electromagnetic repulsive force, and the gas pressure generated by the arc is present between the single-pole blocking unit 2 through the pressure outlet 13 for the pressure trip. This pressure is rapidly moved to the pressure storage space, and the pressure is applied to the pressure surface 14 of the assembled operation bar 10 by applying a pressure beyond the restraint force of the return spring 11 that restrains the operation bar 10. As shown in FIG. 2, the movement bar 10 is rotated counterclockwise around the rotation point 12a, and the rotated movement bar 10 rotates the trip bar 4, which restricts the mechanism part, in a clockwise direction. Let the mechanism part Release (trip).

At this time, the increase in the pressure generated in the extinguishing part shows a different trend depending on the contact pressure and the volume of the extinguishing part, which determine the point of contact repulsion, and this phenomenon makes a difference in the breaking time of the breaker.

When the fault current occurs in the circuit, when the fault current value has a short circuit current value greater than the instantaneous current, the lower breaker CB2 of the upper breaker CB1 and the lower breaker CB2 installed on the same circuit as shown in FIG. 10. Since the arcuate volume of is smaller than the arcuate volume of the upper circuit breaker (CB1) and the contact pressure of the contact is also small, the repulsion point of the contact is fast and the pressure rises quickly, so that the breaker (trip) operation is performed before the upper circuit breaker (CB1) Therefore, it acts as a selective blocking for mutual protection coordination during disconnection period for wiring.

As described above, the pressure trip device of the circuit breaker for wiring has an increase in the gas pressure in the extinguishing unit due to the arc generated by the separation of the contact due to the electromagnetic repulsive force between the movable contactor and the fixed contactor assembled inside the single-pole breaking unit. When the gas pressure is discharged, the conventional multi-stage mechanism is used because the circuit breaker for wiring is directly tripped by rotating the trip bar which is assembled outside each single pole blocking unit and supported by an elastic body to rotate the trip bar that restrains the mechanism. Since the mechanism trips faster than the trip process through operation, it can cut off the arc in a short time to reduce the breaking energy, thereby reducing the damage of the mechanism and the contacts, thereby improving the performance of the circuit breaker for wiring. In the mutual protection cooperation of several interception periods The breaking operation of the circuit breaker is installed in the lower portion thereby improving the characteristics of the first choice to take place by blocking can be effective to protect the circuit breaker installed in the upper portion.

Claims (4)

delete delete delete An enclosure protecting the appliance section; A single-pole blocking unit having a shape capable of controlling the current of each phase and discharging the gas pressure to the outside, and having a space for storing the pressure when assembled; A movable contactor and a fixed contactor which are assembled in the unipolar blocking unit to generate gas pressure from the arc due to electromagnetic repulsive force; A pressure valve having a pair of valve membranes for opening and closing the pressure discharge ports of adjacent single pole blocking units at the same time for phase insulation between the single pole blocking units when pressure is generated in each of the single pole blocking units; An operation bar rotatably assembled at a rotation point with an axis on the outside of each monopole blocking unit, and provided with a pressurizing portion and a bar operating portion and rotating by gas pressure discharged to the pressure discharge port; A return spring for elastically pressing the operation bar to return to its original position; And a trip bar for tripping the mechanism by rotating by the operation bar.

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