KR101797023B1

KR101797023B1 - Apparatus for Prevention of Over Stroke of Load Break Switch

Info

Publication number: KR101797023B1
Application number: KR1020160006122A
Authority: KR
Inventors: 이승수
Original assignee: 엘에스산전 주식회사
Priority date: 2016-01-18
Filing date: 2016-01-18
Publication date: 2017-11-13
Also published as: KR20170086367A

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a structure for preventing overload of a load switch, more particularly, to a structure for preventing an overload of a load switch, .
According to an aspect of the present invention, there is provided an overload prevention structure for a load switch, A main circuit fixed contact installed so as to penetrate the small-diameter portion enclosure; A grounding circuit fixed contact provided so as to penetrate through the small-diameter portion enclosure and spaced apart from the main circuit fixed contact by a predetermined angle; And a movable contact which is rotatably installed in the small-diameter enclosure and can selectively contact the main circuit fixed contact or the grounding circuit fixed contact, wherein the movable contact is formed on the inner surface of the small- And a stopper provided between the contact and the grounding circuit fixed contact to limit the movement of the movable contact.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a load break switch,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a structure for preventing overload of a load switch, more particularly, to a structure for preventing an overload of a load switch, .

In general, a ring main unit (RMU) is a device used for monitoring, controlling and protecting electrical systems used for power distribution and power transmission from a power distribution network. In the structure sealed by SF6 gas, a circuit Breaker, Switches, Earth Switch, and Conductors. Here, the switch includes a load break switch.

FIG. 1 shows a mechanism of a load switch according to the prior art and a perspective view of a small section. 2A to 2C are cross-sectional views showing the open state, the closed state, and the ground state, respectively, of the load switch mechanism according to the prior art. 3A to 3C are cross-sectional views showing the open state, the closed state, and the grounded state, respectively, in the small area of the load switch according to the prior art.

The load switch mechanism 1 includes a main circuit drive shaft 3 capable of opening or closing a main circuit between a pair of side plates 11 and 12, a ground circuit drive shaft 4 capable of opening or closing the ground circuit, And a main shaft 5 connected to the movable contact 8 of the soot unit 2 is provided. A drive spring (6) is provided between the main circuit drive shaft (3) and the ground circuit drive shaft (4).

The load switch mechanism 1 performs a 3-position operation. When the main circuit drive shaft 3 or the ground circuit drive shaft 4 is rotated by a handle (not shown), the main shaft 5 rotates via links 7a and 7b, The movable contact 8 of the unit 2 is connected to form an open, closed, and grounded state.

When the main circuit is charged, the main circuit drive shaft 3 is rotated 180 degrees in the clockwise direction using the handle in the open state as shown in FIG. 2A. Then, the driving spring 6 is compressed, and the compressed driving spring 6 is released while passing the reference dead point, and the main shaft 5 is rotated counterclockwise through the links 7a and 7b by 60 degrees, State. This causes the movable contact 8 of the small portion 2 connected to the main shaft 5 to contact the main circuit fixed contacts 9a and 9b of the small portion 2 so that the main circuit is charged To the closing state of Fig. 3B).

In the case of inputting the grounding circuit, the grounding circuit drive shaft 4 is rotated 180 degrees clockwise using the handle in the open state as shown in FIG. 2A. Then, the drive spring 6 is compressed, and the compressed drive spring 6 is released while passing the reference dead point, and the main shaft 5 is rotated clockwise through the links 7a and 7b by 60 degrees, . . This causes the movable contact 8 of the small portion 2 connected to the main shaft 5 to contact the ground circuit fixed contacts 10a and 10b of the small portion 2 so that the ground circuit is charged To the closing state in Fig. 3C).

When the main switch is turned on or the ground is turned on, the force of the drive spring 6, which is compressed by the load switch mechanism 1, exceeds the reference dead point and the drive spring 6 is released, Is transmitted to the soot section (2) of the load switch, and the main circuit is charged or grounded. Since it is difficult to precisely adjust the force of the compressed drive spring 6 to a size required for inputting the main circuit and inputting the ground, it is general to give a slightly higher force than the rated load. However, when the elastic force of the drive spring 6 is increased in this manner, the movable contact 8 may be shifted by a certain distance past the fixed contact (main circuit fixed contact or ground circuit fixed contact) due to inertia. Fig. 4 shows a state in which the contact portion is shifted when the main circuit is turned on in the small area of the load switch according to the prior art. In this case, the contact area between the movable contact 8 and the main circuit fixed contacts 9a and 9b may be reduced, which may cause an accident.

With regard to the soot part of the gas insulated load switch, refer to Korean Patent No. 10-0764067, " Circuit breaker for gas insulated load switch ".

SUMMARY OF THE INVENTION It is an object of the present invention to provide an overload prevention structure for a load break switch which prevents a contact portion of a contact portion from being overloaded while preventing an excessive input during a closing operation of the load break switch.

According to an aspect of the present invention, there is provided an overload prevention structure for a load switch, A main circuit fixed contact installed so as to penetrate the small-diameter portion enclosure; A grounding circuit fixed contact provided so as to penetrate through the small-diameter portion enclosure and spaced apart from the main circuit fixed contact by a predetermined angle; And a movable contact which is rotatably installed in the small-diameter enclosure and can selectively contact the main circuit fixed contact or the grounding circuit fixed contact, wherein the movable contact is formed on the inner surface of the small- And a stopper provided between the contact and the grounding circuit fixed contact to limit the movement of the movable contact.

Here, the stopper is spaced apart from the main circuit fixed contact and the ground circuit fixed contact at predetermined intervals, respectively.

The stopper may be formed of an elastic material.

Further, the contact surface of the stopper contacting the movable contact is formed so as to be in surface contact with the movable contact.

The stopper may include a first stopper provided at one side of the main circuit fixed contact and a second stopper provided at one side of the ground circuit fixed contact.

An insertion hole is formed in the stopper, and a spring is provided in the insertion hole, so that the movable contact contacts the spring.

According to the overload preventing structure of the load break switch according to the embodiment of the present invention, the stopper for preventing over-discharge of the load switch is provided in the small portion of the load break switch, so that even if the movable contact passes over the fixed contact during the closing operation of the mechanism, So that there is an effect that the sufficient contact range can be maintained. Thus, it is possible to maintain stable operation characteristics.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a load switch mechanism and a small section according to the prior art; FIG.
2A to 2C are cross-sectional views showing an open state, a closed state, and a grounded state in the load switch mechanism according to the related art.
Figs. 3A to 3C are cross-sectional views showing an open state, a closed state, and a grounded state in the small area of the load switch according to the related art.
Fig. 4 shows a state in which a contact portion is shifted in a softer portion of the load switch according to the related art.
FIG. 5 is a cross-sectional view showing a small portion of a load switch according to an embodiment of the present invention, showing an open state.
6 is a perspective view of a portion where the stopper is installed in Fig.
Figs. 7, 8 and 9 are cross-sectional views showing a small portion of a load switch according to another embodiment of the present invention, which show an open state, a closed state, and a grounded state, respectively.
10 is a partial cross-sectional view of a small portion of a load switch according to another embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, which are intended to illustrate the present invention in a manner that allows a person skilled in the art to easily carry out the invention. And does not mean that the technical idea and scope of the invention are limited.

FIG. 5 is a cross-sectional view showing the opening portion of the load switch according to the embodiment of the present invention, and FIG. 6 is a perspective view of a portion where the stopper is installed in FIG. The overload prevention structure of the load switch according to each embodiment of the present invention will be described in detail with reference to the drawings. In the present invention, the same reference numerals are used for the same components as those of the prior art, and reference is made to FIGS. 1 to 3C.

The overload preventing structure of the load switch according to an embodiment of the present invention includes a soffit enclosure 20; Main circuit fixed contacts (9a, 9b) installed through the small-diameter portion enclosure (20); Grounding circuit fixed contacts (10a, 10b) installed at a predetermined angle to the main circuit fixed contacts (9a, 9b); And a movable contact 8 rotatably provided in the small-diameter enclosure 20 and capable of selectively contacting the main circuit fixed contacts 9a and 9b or the ground circuit fixed contacts 10a and 10b And is provided between the main circuit fixed contacts 9a and 9b and the grounding circuit fixed contacts 10a and 10b on the inner surface of the counterpart enclosure 20 to restrict movement of the movable contact 8 And stoppers (30a, 30b) for stopping the operation.

The ring main unit (RMU) is a device used for surveillance, control, and protection of electrical systems used for power distribution to the power supplied from power distribution. It is equipped with Circuit Breaker in a structure sealed and insulated by SF6 gas. Switches, switches, earth switches, and conductors. Here, the switch includes a load break switch.

The load switch includes a switch mechanism (1) for providing and transmitting the power required to cut off the circuit, and a soffit part (2) for performing the cutoff of the circuit.

The switch mechanism 1 is constituted by a pair of side plates 11 and 12 and a mechanism portion provided between the pair of side plates 11 and 12. The switch mechanism (1) includes a main circuit drive shaft (3) for inputting or opening the main circuit section and a ground circuit drive shaft (4) for inputting or opening the ground circuit section. The main circuit drive shaft 3 and the ground circuit drive shaft 4 are put in the open or closed state as they are rotated clockwise or counterclockwise at a predetermined angle (for example, 180 degrees). At this time, the main circuit drive shaft 3 and the ground circuit drive shaft 4 can be rotated by a handle (not shown).

The end of the main circuit drive shaft 3 protrudes to one side of the first side plate 11 so that the main circuit drive shaft 3 can be rotated. At the end of the main circuit drive shaft 3, a main circuit operation hole 3a is formed along the axial direction so as to insert the handle.

In order to rotate the ground circuit drive shaft (4), the end of the ground circuit drive shaft (4) projects to one side of the first side plate (11). At the end of the ground circuit drive shaft 4, a ground circuit operation hole 4a is formed along the axial direction so that the handle can be inserted.

The main shaft 5 is provided so as to be spaced apart from the main circuit drive shaft 3 and the ground circuit drive shaft 4. The main shaft 5 includes an upper link 7a connected to the ground circuit drive shaft 4, a lower link 7b connected to the main circuit drive shaft 3, and a shaft link 5a surrounding the main shaft 5 And is rotatably installed. The main shaft 5 is connected to the movable contact 8 of the small portion 2 to rotate the movable contact 8 during rotation.

A drive spring (6) is provided between the main circuit drive shaft (3) and the ground circuit drive shaft (4). The drive spring 6 receives a compressive force when the main circuit drive shaft 3 or the ground circuit drive shaft 4 rotates and is released at a point passing through the dead point to provide a rotational force to the main shaft 5.

The small-diameter portion enclosure 20 may be formed in a cylindrical shape. The small-diameter portion enclosure 20 is composed of a pair of symmetrical structures and can be coupled by screwing. One end of each of the main circuit fixed contacts 9a and 9b and the ground circuit fixed contacts 10a and 10b may be exposed to both sides of the small-side enclosure 20 and connected to a power source or a load. Here, the main circuit fixed contacts 9a and 9b and the ground circuit fixed contacts 10a and 10b may be provided for each phase in the case of a three-phase circuit.

The movable contact 8 is connected to the main shaft 5 so as to be rotatable. More specifically, the center shaft 8a of the movable contact 8 can be connected to the main shaft 5 and rotated.

The main circuit fixed contacts 9a and 9b and the grounding circuit fixed contacts 10a and 10b can be installed through the small-diameter enclosure 20. That is, one end of the main circuit fixed contacts 9a and 9b and the ground circuit fixed contacts 10a and 10b may be exposed to the outside of the soot unit enclosure 20 and may be connected to a power source or a load, 9b and the other end of the grounding circuit fixed contacts 10a, 10b may protrude into the inside of the soot unit enclosure 20 and selectively contact the movable contact 8.

Here, the main circuit fixed contacts 9a, 9b and the ground circuit fixed contacts 10a, 10b may be spaced apart at a specific angle. For example, the main circuit fixed contacts 9a and 9b and the ground circuit fixed contacts 10a and 10b may be provided at intervals of 60 degrees from each other.

The stoppers 30a and 30b are formed on the inner circumferential surface of the small-diameter portion enclosure 20 and between the main circuit fixed contacts 9a and 9b and the ground circuit fixed contacts 10a and 10b, 9a and 9b and the grounding circuit fixed contacts 10a and 10b so as to limit movement of the movable contact 8. [ The stoppers 30a and 30b may be formed of the same material as the inner circumferential surface of the small- For example, it may be formed of glass fiber or synthetic resin. Further, the stoppers 30a and 30b may be formed of an elastic material.

Here, the stoppers 30a and 30b may be formed by partially protruding the inner peripheral surface of the small-diameter portion enclosure 20. 5 shows that the stoppers 30a and 30b are formed in a round shape protruding to a predetermined thickness from the inner circumferential surface of the small-diameter portion enclosure 20, but the contact surfaces 30a1 and 30a2 Any shape can be used as long as it has a shape. At this time, the contact surfaces 30a1 and 30a2 may be formed to be in surface contact with the movable contact 8.

In another embodiment, referring to FIG. 7, the stopper may be divided into first stoppers 31a and 31b and second stoppers 32a and 32b. The first stoppers 31a and 31b are formed on one side of the main circuit fixed contacts 9a and 9b and the second stoppers 32a and 32b formed on one side of the ground circuit fixed contacts 10a and 10b, .

The first stoppers 31a and 31b are formed at positions where the movable contact 8 passes the main circuit fixed contacts 9a and 9b and the second stoppers 32a And 32b are formed at positions where the movable contact 8 passes the grounding circuit fixed contacts 10a and 10b.

The first contact surface 31a1 and the second stoppers 32a and 32b that make the first stoppers 31a and 31b in contact with the movable contact 8 contact with the movable contact 8, 32a1 may be formed to be in surface contact with each other.

Another embodiment will be described with reference to FIG. The first and second stoppers 31a and 31b and the second stoppers 32a and 32b are formed with first and second insertion holes 31a3 and 32a3, Springs 35 and 36 may be provided in the second insertion hole 32a3. The first insertion hole 31a3 and the second insertion hole 32a3 may be provided with contacts 37 and 38 that are resilient to the springs 35 and 36 and come into contact with the movable contact 8. The movable contact 8 contacts the main circuit fixed contacts 9a and 9b due to the excessive setting of the drive spring 6 because the movable contact 8 contacts the contacts 37 and 38 which receive the elastic force of the springs 35 and 36. [ It is possible to return to the correct position.

The operation of the overrun prevention structure of the load switch according to the embodiment of the present invention will be described.

When turning on the main circuit, turn the main circuit drive shaft (3) 180 degrees clockwise using the handle. Then, when the driving spring 6 passes through the reference dead point as the compression advances, the compressed driving spring 6 is released and the main shaft 5 is rotated counterclockwise through the links 7a and 7b by 60 ° . This causes the movable contact 8 of the small portion 2 connected to the main shaft 5 to contact the main circuit fixed contacts 9a and 9b of the small portion 2 so that the main circuit is charged 2a, Fig. 2b, and the like in Figs. 7 and 8). At this time, the force of the drive spring 6 is set to be excessively larger than that in the normal operation, so that the movable contact 8 comes into contact with the first stoppers 31a, 31b even if the main circuit fixed contacts 9a, So that the contact portions are not shifted from each other. The first stoppers 31a and 31b are spaced apart from the main circuit fixed contacts 9a and 9b by a predetermined distance and the movable contacts 8 are reversely moved by the repulsive force or elastic action of the first stoppers 31a and 31b It can be returned so as to substantially coincide with the main circuit fixed contacts 9a and 9b.

In the case of putting the grounding circuit, in the open state, turn the grounding circuit drive shaft (4) 180 degrees clockwise using the handle. Then, when the driving spring 6 passes through the reference dead point after the compression is progressed, the compressed driving spring 6 is released and the main shaft 5 is rotated clockwise through the links 7a and 7b by 60 degrees. This causes the grounding circuit to be turned on while the movable contact 8 of the small portion 2 connected to the main shaft 5 contacts the grounding contacts 10a and 10b of the small portion 2 See FIG. 2C, and the like in FIGS. 7 and 9). At this time, since the force of the drive spring 6 is set to be excessively larger than that in the normal operation, the movable contact 8 contacts the second stoppers 32a and 32b even if the grounding circuit fixed contacts 10a and 10b are slightly overtraveled, The contact portions are not shifted from each other. The second stoppers 32a and 32b are spaced apart from the grounding circuit fixed contacts 10a and 10b by a predetermined distance and the movable contact 8 is reversely moved by the repulsive force or elastic action of the second stoppers 32a and 32b It can be returned to almost coincide with the grounding circuit fixed contacts 10a and 10b while moving.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the scope of the present invention but to limit the scope of the technical idea of the present invention. That is, the scope of protection of the present invention should be construed according to the following claims, and all technical ideas which are within the scope of the same should be interpreted as being included in the scope of the present invention.

1 Actuator Mechanism 2
3 Main circuit drive shaft 3a Main circuit operation hole
4 Ground circuit Drive shaft 4a Ground circuit Operation hole
5 Main shaft 5a Shaft link
6 drive spring 7a upper link
7b Lower link 8 movable contact
8a center shaft 9a, 9b main circuit fixed contact
10a, 10b grounding circuit fixed contacts 11, 12 first and second side plates
20 Loop unit housing 30a, 30b stopper
30a1, 30a2 Contact surface 31a, 31b First stopper
31a1 First contact surface 31a3 First insertion hole
32a, 32b Second stopper 32a1 Second contact surface
32a3 second insertion hole 35, 36 spring
37, 38 contactor

Claims

SOHO department enclosure;
A main circuit fixed contact installed so as to penetrate the small-diameter portion enclosure;
A grounding circuit fixed contact provided so as to penetrate through the small-diameter portion enclosure and spaced apart from the main circuit fixed contact by a predetermined angle;
And a movable contact which is rotatably installed in the outer casing and can selectively contact the main circuit fixed contact or the ground circuit fixed contact,
And a stopper formed on an inner surface of the small-diameter outer casing and disposed between the main circuit fixed contact and the grounding circuit fixed contact to limit movement of the movable contact,
The stopper includes a first stopper provided at a position where the movable contact passes the main circuit fixed contact at a predetermined interval when the main circuit is turned on, and a second stopper provided at a point where the movable contact contacts the ground circuit fixed contact And a second stopper,
Wherein the first stopper and the second stopper are provided with a first insertion hole and a second insertion hole, wherein the first insertion hole and the second insertion hole are provided with contacts that contact the movable contact,
Wherein the first insertion hole and the second insertion hole are provided with a spring for elastically supporting the contactor.

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The overload prevention structure of a load break switch according to claim 1, wherein the stopper is made of an elastic material.

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