KR20170062916A

KR20170062916A - Power Distributing Board with Apparatus for enduring Earthquake

Info

Publication number: KR20170062916A
Application number: KR1020150168699A
Authority: KR
Inventors: 임채현
Original assignee: 대진전기 (주)
Priority date: 2015-11-30
Filing date: 2015-11-30
Publication date: 2017-06-08
Also published as: KR101812157B1

Abstract

A switchboard with an earthquake-proof device is disclosed. The switchboard has a frame in which a distribution facility is installed, and a seismic device disposed at least at one portion of the lower portion of the frame. The earthquake-proof device includes: a substrate having an upper surface with a depressed portion having a different depth depending on the position of the bottom surface; a ball bearing placed in the depression; a receiving member positioned on the upper portion of the ball bearing; . By providing an earthquake-proof device in the switchboard, it is possible to protect the switchboard from strong external vibration impacts such as earthquakes and eventually to the equipment at the rear end of the switchboard.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a power distribution board with an earthquake-

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switchboard used for monitoring, controlling, and protecting a power system, and more particularly, to a switchboard having an earthquake-resistant device capable of protecting internal equipment from an external vibration impact such as an earthquake.

In general, the switchboard is installed in a power station, a substation or a building with an electric facility, and is used for monitoring, controlling and protecting the power system. In the switchboard, a lightning arrestor, a breaker, an indicator, So as to perform opening and closing of the electric circuit and control of the apparatus.

The switchboard is used for power control of buildings or plant equipment over a long period of time, and can be subject to large vibrations in the switchboard due to earthquakes or other external shocks during long-term use. Such vibrations cause the connection and connection state of the power system inside the switchgear and the relative position of the components to fluctuate, which can cause fatal defects in the performance of the switchgear. The performance deterioration of the power transmission / reception system may cause irreparable electrical shock to the equipment at the rear end. Therefore, it is necessary to provide an earthquake-proof device capable of protecting the internal equipment in spite of strong external vibration such as earthquake.

The existing method for the seismic design of the switchgear is mainly composed of additional stiffener in the box. This method complements the stiffness that prevents distortion through the stiffener. In another method, there is a method of constructing so as not to be loosened by using an anti-vibration nut as a fixture of various facilities in a cabinet. However, this is designed not to dampen or cushion vibration of earthquake but to withstand vibration.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide an earthquake-resistant apparatus that can protect a transmission and reception system from strong external vibration shocks such as an earthquake, It is to provide a plan.

In order to accomplish the above object, a switchboard according to the present invention includes a frame in which a power distribution facility is installed, and at least one earthquake-resistant device disposed at least at a lower portion of the frame. Wherein the vibration isolation device comprises: a substrate having a depression on an upper surface thereof, the depression being different in depth from the bottom surface; A ball bearing placed in the depression; A receiving member partially receiving the upper portion of the ball bearing and positioned on the upper portion of the ball bearing; And a coupling member fixed to the frame and coupled with the receiving member.

The depressed portion is formed such that the depth of the bottom surface at the central portion is the deepest.

The engaging member and the receiving member are relatively slidably coupled in the vertical direction, and between the engaging member and the receiving member, the receiving member further includes supporting means for elastically supporting the engaging member. The support means may comprise a spring, or hydraulic cylinder.

Preferably, a holding means for applying and holding an elastic force to maintain a predetermined gap between the coupling member and the receiving member is further provided. The holding means includes a spring supporting portion extending upward from the receiving member through the coupling member to the outside of the coupling member; And a spring interposed between an outer surface of the engaging member and the spring support portion.

Between the coupling member and the housing member, an attenuating means for attenuating vibration in the vertical direction is further provided. The damping means may be constituted by surfaces which are press-fitted between the receiving member and the engaging member and brought into mutual contact with each other.

Preferably, for the receiving member, a pressurizing means for exerting an elastic force in a direction in which the ball bearing is located at the lowest depth portion in the depression may be provided. The pressing means may include a spring having one end supported on the inner wall of the depression on the substrate and the other end supported on the outer wall of the receiving member. The spring may include a coil spring arranged to surround the receiving member.

According to the present invention, by providing an earthquake-proof device in a switchboard, it is possible to protect a switchboard from a strong external vibration impact, such as an earthquake, and ultimately to protect facilities at the rear end of a switchboard.

1 is a schematic diagram of a switchboard according to the present invention;
2 is a side cross-sectional view of the vibration-isolating apparatus of Fig.
Fig. 3 is a view showing another embodiment of Fig. 2; Fig.
Fig. 4 is a view showing another embodiment of Fig. 2; Fig.
Fig. 5 is a view showing an example in which a damping device is added to the embodiment of Fig. 2;
6 is a view showing still another embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

1 is a schematic diagram of a switchboard according to the present invention. The switchboard has a frame (10) in which power distribution facilities are installed, and at least one earthquake-proof device (20) disposed on at least one part of the lower part of the frame (10). The earthquake-proof apparatus 20 is installed on the bottom surface of the frame 10, and preferably four earthquake-proof devices 20 are installed on four corners of the bottom surface.

2 is a side sectional view of the vibration-isolating apparatus of Fig.

The vibration isolation device 20 according to the present invention comprises a substrate 21, a ball bearing 23, a housing member 24, and a coupling member 25. The substrate 21 is a member placed on the ground, and its bottom surface is in contact with the ground. Therefore, for example, when an earthquake occurs, the vibration of the earthquake is transmitted to the substrate 21 first. A separate shock absorbing member such as a rubber plate may be additionally provided between the substrate 21 and the paper.

A depression 22 is formed on the upper surface of the substrate 21. The depressed portion 22 is configured such that the depth of the bottom surface varies depending on the position, and preferably the depression 22 is formed such that the depth of the bottom surface at the central portion is the deepest.

The ball bearing 23 is placed in the depression 22. At this time, the ball bearing 23 is placed at the central portion having the deepest depth of the depressed portion 22. The receiving member 24 partially receives the upper portion of the ball bearing 22 and is positioned on top of the ball bearing 22.

The engaging member 25 is fixed to the frame 10 of the switchboard. That is, the engaging member 25 is firmly fixed to the lower surface of the frame 10 by using a separate fastener. Further, the engaging member 25 is engaged with the receiving member 24. Specifically, the engaging member 25 is formed in a plate-like shape. The engaging member 25 is provided at a central portion of the engaging member 25 so as to open downward and extend upward, and the accommodating member 24 is accommodated in the accommodating space. Accordingly, the engaging member 25 and the receiving member 24 are relatively slidably coupled in the vertical direction.

Between the engaging member 25 and the receiving member 24, a supporting means for elastically supporting the engaging member 25 upwardly is further provided. In the embodiment of FIG. 2, the support means is composed of a spring 26, in particular a coil spring.

Hereinafter, an earthquake-proof operation of a switchboard according to an embodiment of the present invention will be described.

The substrate 21 is placed on the ground and the ball bearing 23, the housing member 24, the spring 26 and the engaging member 25 are placed on the substrate 21 in the state shown in Fig. In this state, the ball bearing 23 is in a state of being positioned at the central portion of the depression 22 of the substrate 21. [ The coupling member 25 is supported at the upper portion of the receiving member 24 by the elastic force of the spring 26 and the coupling member 25 is fixed to the lower surface of the frame 10, The frame 10 is supported on the substrate 21 in an upwardly supported state.

When an earthquake occurs, the vibration can divide its components horizontally and vertically. The vibration in the horizontal direction component is buffered by the structure between the substrate 21 and the ball bearing 23. That is, when the ground is shaken by the earthquake in the horizontal direction, the substrate 21 is shaken in the horizontal direction, and the ball bearing 23 moves in the direction opposite to the moving direction of the substrate 21. The ball bearing 23 thus moved is subjected to a force that returns to the deepest portion of the depression 22 by the load of the entire transmission and distribution board and the displaced substrate 21 returns to its original position due to the vibration of the earthquake You will receive the power to be. Therefore, only the substrate 21 is shaken in the horizontal direction by the impact of the earthquake and the vibration in the horizontal direction of the ball bearing 23, the housing member 24 and the coupling member 25 is transmitted to the structure between the substrate 21 and the ball bearing 23 .

The vibration of the vertical direction component is buffered by the structure of the housing member 24, the engaging member 25, and the spring 26. That is, when the substrate 21 is shaken in the vertical direction due to an earthquake or as a result of such shaking in the horizontal direction, shaking occurs in the vertical direction to the housing member 24 as a result, the housing member 24 And vibrate in the vertical direction. At this time, when upward vibration occurs, the housing member 24 is moved upward to compress the spring 26, so that the coupling member 25 maintains the original position, and when the downward vibration that returns to the home position occurs again, Only the housing member 24 is moved downward while the compression of the spring 26 is restored while maintaining the original position. Therefore, the engaging member 25 maintains its position even when the vibration occurs in the vertical direction, and consequently the frame 10 maintains the original position.

According to the present invention, when the ground surface is shaken due to an earthquake or the like, vibration is buffered in both the horizontal direction and the vertical direction, and the frame 10 is maintained at the original position. Therefore, the impact on internal equipment of the switchgear is mitigated and the internal equipment is protected.

Fig. 3 is a view showing another embodiment of Fig. 2, in which an example in which a hydraulic cylinder 36 is employed in place of the spring 26 in the embodiment of Fig. 2 is shown. The function of the hydraulic cylinder 36 is basically the same as the function of the spring 26 and functions to elastically support the coupling member 25 upwardly of the receiving member 24. [ Further, when the hydraulic cylinder 26 is employed, there is an advantage that additional vibration of the frame 10 due to residual vibration occurs less than in the case of the spring 26.

Even if the vibration due to the earthquake is extinguished, in the case where the spring 26 is excessively compressed in the function of the seismic device in the structure of FIG. 2, the restoring force is also strong, and excessive restoration and recompression can be repeated. In this case, even if the earthquake is stopped, even if the substrate 21 is not subjected to vibration, the coupling member 25 may receive the residual vibration oscillating in the up-and-down direction due to the strong elastic force of the spring 26 after strong vibration. However, when the hydraulic cylinder 36 is used as the elastic supporting means, since the hydraulic cylinder 36 itself has a damping function for attenuating a small vibration, the residual vibration is rapidly attenuated, 10) can be reduced.

Fig. 4 is a view showing another embodiment of Fig. 2, in which both the spring 26 of Fig. 2 and the hydraulic cylinder of Fig. 3 are employed as the elastic supporting means. When the load of the power transmission / reception section is large, it is necessary to compensate the upward supporting force, or when the vibration is generated, the strong resilient response effect by the spring 26 and the residual vibration damping effect by the hydraulic cylinder 36 are simultaneously obtained. Both the hydraulic cylinder 26 and the hydraulic cylinder 36 can be installed.

Fig. 5 is a diagram showing an example in which an attenuator is added to the embodiment of Fig. 2. Fig. In the case of employing the hydraulic cylinder 36 shown in the embodiment of FIG. 3, the residual vibration that may occur immediately after the earthquake-induced vibration stops can be attenuated as compared with the case of employing the spring 26 . However, when a very strong vibration of the earthquake occurs, the residual vibration after the vibration stops may not be satisfactorily attenuated by the self-function of the hydraulic cylinder 36 alone. Therefore, in order to attenuate the vibration in the vertical direction between the engaging member 25 and the receiving member 24, separate attenuation means may be provided for this case.

5 shows an example in which a damper 40 for applying a frictional force to the coupling member 25 is provided as the damping means. The damper 40 may be fixed to a separate outer wall surface or fixed on the substrate 21. In addition, the damper 40 may be configured to be kept in contact with the engaging member 25 at all times, or may be configured to be separately actuated by the controller only when an occurrence of an earthquake is detected.

In the embodiment of FIG. 5, the damping means is constituted by a further member for applying a frictional force. Alternatively, the damping means may be implemented through a coupling structure between the housing member 24 and the coupling member 25. In other words, the coupling between the housing member 24 and the coupling member 25 is formed by a press-fitting coupling structure, so that the attenuation means can be realized without any additional member. When the diameter of the outer surface of the housing member 24 and the diameter of the inner surface of the engaging member 25 are made to be substantially equal to each other, they must be coupled by press-fitting so that the outer surface of the housing member 24, 25 are in mutual contact with each other with a strong frictional force. Therefore, when the housing member 24 and the engaging member 25 move relatively up and down, the vibration damping action occurs by this frictional force, and the residual vibration is effectively absorbed.

6 is a diagram showing another embodiment of the present invention. In the present embodiment, two springs are added to the embodiment of Fig. 2, and it is possible to add any one of these springs, and it is also possible to add such springs to other embodiments described above.

In the embodiment of FIG. 6, a holding means for applying and holding an elastic force so as to maintain a constant gap between the engaging member 25 and the receiving member 24 is additionally provided. Such a retaining means comprises spring support portions 51, 52 and a spring 56. The spring support portions 51 and 52 are formed to extend upward from the housing member 24 through the engagement member 25 to the outside of the engagement member 25. For practical ease of manufacture, A shaft 51 which is rigidly connected to the upper surface of the housing member 24 by screwing or the like and whose upper end is extended outwardly of the engaging member 25 and a supporting member 52 ). The spring 56 is in the form of a coil spring and is interposed between the upper surface of the engaging member 25 and the support member 52 of the spring supports 51 and 52.

With this configuration, when the engaging member 25 is moved upward relative to the receiving member 24, the spring 56 is compressed and is forced to be moved downward by the stretching force. Conversely, when the engaging member 25 is moved downward by the receiving member 24 The spring 56 is stretched to apply a force to move it upward by the restoring force. Therefore, when the vibration is generated in the up-down direction, the gap between the receiving member 24 and the engaging member 25 is restored to the original state with a stronger force and the restoring force is enhanced when vibration occurs due to an earthquake or the like.

Further, in the embodiment of Fig. 6, a pressing means for applying an elastic force to the housing member 24 is additionally provided. The pressing means has a function of exerting an elastic force in a direction in which the ball bearing 23 is located at the lowest depth portion in the depressed portion 22. More specifically, the outer end portion is supported on the inner wall of the depressed portion 22 on the substrate 21 And a coil spring 62 whose inner end is supported on the outer wall of the housing member 24. [ The coil spring 62 is disposed so as to surround the housing member 24, thereby functioning to exert an elastic force concentrically toward the center portion which is the lowest depth portion of the depression 22. Therefore, since the ball bearing 23 receives a force restored by the coil spring 62 in addition to the restoring force toward the lowest depth portion of the depressed portion 22 due to the depth difference of the depressed portion 22, A restoration countermeasure is made.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims and their equivalents. Of course, such modifications are within the scope of the claims.

Claims

A frame in which a power distribution facility is installed, and at least one earthquake-resistant device disposed at least at one portion of a lower portion of the frame,
Wherein the seismic isolation device comprises:
A substrate having a depression on the upper surface thereof, the depression being different in depth from the bottom surface;
A ball bearing placed in the depression;
A receiving member partially receiving the upper portion of the ball bearing and positioned on the upper portion of the ball bearing; And
An engaging member fixed to the frame and engaged with the receiving member;
And a control unit for controlling the switchgear.

The method according to claim 1,
Wherein the depression is formed such that the depth of the bottom surface at the central portion is the deepest.

The method according to claim 1,
Wherein the engaging member and the receiving member are relatively slidably coupled in the vertical direction,
And a supporting means for elastically supporting the coupling member upward by the receiving member is further provided between the coupling member and the receiving member.

The method of claim 3,
Wherein said support means comprises a spring.

The method of claim 3,
Wherein said support means comprises a hydraulic cylinder.

The method of claim 3,
Maintaining means for applying and holding an elastic force so as to maintain a constant gap between the coupling member and the receiving member;
Further comprising:

The method according to claim 6,
The holding means comprises:
A spring support portion extending from the housing member to the outside of the coupling member through the coupling member; And
A spring interposed between an outer surface of the engaging member and the spring supporting portion;
And a control unit for controlling the switchgear.

The method of claim 3,
Further comprising attenuation means for attenuating vibration in the vertical direction between said engaging member and said receiving member.

9. The method of claim 8,
Wherein the damping means is constituted by surfaces which are press-fitted between the accommodating member and the engaging member and brought into mutual contact with each other.

10. The method according to any one of claims 1 to 9,
A pressing means for applying an elastic force to the receiving member in a direction in which the ball bearing is positioned at the lowest depth portion in the depression;
Further comprising:

11. The method of claim 10,
Wherein the pressing means comprises: a spring having one end supported on an inner wall of the depression on the substrate and the other end supported on an outer wall of the receiving member;
And a control unit for controlling the switchgear.

12. The method of claim 11,
The spring including a coil spring arranged to surround the housing member;
And a control unit for controlling the switchgear.