KR101541655B1 - Earthquake-proof switch board of earthquake-control installed with steel body mode absorbing vibration according to weight of composing equipment - Google Patents

Abstract

The present invention relates to a vibration control-type earthquake-resistant distribution board employing a steel body mode absorbing vibration according to a weight of a component device, and more specifically, to an earthquake-resistant distribution board having a vibration control effect by misaligning with a predominated period range of an earthquake from a viewpoint that natural frequencies of devices in a distribution board are different by weights, shapes, and positions. The vibration control-type earthquake-resistant distribution board employing a steel body mode absorbing vibration according to a weight of a component device according to the present invention comprises special devices which absorb a vertical and a horizontal vibration impact for a circuit breaker, a current transformer, a bus bar, etc in a distribution board to demonstrate earthquake-resistant performance, comprises an accessory device for each device in the distribution board which absorbs a shock wave transferred from a frame of the distribution board to improve resistance to vertical and horizontal vibration to demonstrate the earthquake-resistant performance, and demonstrates a sufficient earthquake-resistant effect even when a steel body lighter and less strong than a conventional earthquake-resistant distribution board is used. Additionally, an internal structure of the conventional distribution board is maintained and the special devices are used to fix the devices in the distribution board to facilitate simple installation, and can be applied to a general distribution board such as an extra high voltage board, a high voltage board, a low voltage board, a motor control center (MCC), a panel board, etc. without limitations.

Description

{Earthquake-proof switch board with earthquake-control installed with steel body mode absorbing vibration according to weight of composing equipment}

The present invention relates to a vibration-damping vibration-damping switchgear according to the weight of components, and more particularly to a vibration-damping vibration damping switchgear having a predominated period of an earthquake in terms of weight, shape, It is equipped with a special device capable of absorbing vertical and horizontal vibration shocks for each device such as a breaker, a current transformer, and a bus in the switchboard so as to be shifted from the band, so that it exhibits seismic performance and is transmitted in the frame of the switchboard It is possible to exhibit the seismic performance by improving the resistance to vertical and horizontal vibration by having an accessory device capable of absorbing the shock wave. Even when using a rigid body having a small weight and low strength compared to the existing seismic transmission and distribution board, The present invention relates to a switchboard having an effect.

Generally, the water front, the MCC, and the distribution board receive the high-voltage or extra-high voltage electricity supplied by the electric power company, convert it into the voltage used in the customer, and distribute it to the load facility.

Such a switchboard, an MCC panel, and a distribution panel (hereinafter simply referred to as a "switchboard panel") are cubic cubicles with a partition structure. Inside, there are electric devices such as a high voltage circuit breaker and a current transformer, Respectively. In addition, a bus bar for connecting power devices to each other in accordance with the power system and wiring for measuring and monitoring electric power devices are disposed in the switchboard in addition to the electric power system, and the outside of the cubicle- And a hole for the monitoring wiring and the wiring of the load equipment is formed on the bottom floor of the power distribution unit.

As the switchgear is installed on the floor of the building in this way, when the vibration or shock due to the earthquake occurs, the electric equipment inside the control panel and the parts such as the wiring and the protection system device connecting the power devices are easily damaged .

In order to solve such a problem, various techniques for enduring an external shock such as an earthquake have been proposed by mounting a shock absorber.

For example, Korean Patent No. 10-1139226 discloses a distribution board including an elastic support and an auxiliary vibration shield for reducing vibration transmission on a lower floor of a main body frame, And a plurality of metal material laminated plates sandwiched therebetween.

In addition, Korean Patent No. 10-1155995 and No. 10-1193472 disclose a device for supporting a switchboard so as to be spaced apart from the floor so as to reduce vibrations applied to a floor and a floor, And a plurality of damping mechanisms coupled to the floor fixing frame and supporting the lower surface of the switchgear, wherein the damping mechanism includes a screw shaft inserted into the insertion hole provided at the bottom of the power distribution panel and a ball provided at one end of the screw shaft, The ball stud having the ball stud and the socket to which the ball is pivotally coupled is absorbed by the ball stud when the external impact is applied.

Korean Patent Laid-Open No. 10-2009-0083054 discloses a floor slab of a building, which is fixed via an anchor bolt, and upper and lower vertical frames are connected and fixed in a lattice shape on the upper part of a vertical column frame, And an upper support plate for supporting a switchboard on the upper horizontal frame and the upper vertical frame, wherein the upper horizontal frame and the vertical column frames are coupled to each other by a frame assembly bolt and connected in a diagonal direction via a horizontal frame bracing The upper vertical frame is connected to the lower end of the vertical column frame while being fastened to each other by a frame assembly bolt at a position where the upper vertical frame meets the vertical column frame, and connected to the lower vertical frame arranged in the building floor slab and the vertical frame bracing in a diagonal direction about There it ignores.

In addition, Korean Patent No. 10-1253774 discloses a structure in which a joining member made of an elastic material is used at a portion connecting two bus bars, a portion where a power device is installed, or a portion connecting a bus bar and a power device, Disclosed is an anti-seismic water distribution panel that prevents breakage of internal components and prevents unexpected interruption of power supply.

In addition, Korean Patent No. 10-1049407 discloses a floor panel having a square frame-type base and a square channel-shaped upper channel coupled with the base to support a plurality of the switchboards, A coil spring mount installed between the upper channel and the lower channel for absorbing vibrations and shock transmitted from the ground and a lower spring installed between the upper channel and the lower channel to support the upper channel, And a plurality of hydraulic cylinders installed on a floor surface of the ground or the building to move the upper channel up and down a predetermined section.

Thus, the prior art has mainly been studied only for a technique of installing a member capable of absorbing vibrations between a lower floor of a power transmission line and a building floor, or a technique of protecting components in a power distribution board with an elastic member. However, such a conventional technology has a limit in that the installation is complicated, a lot of additional parts are required, and the installation cost is high, so the economical efficiency is low and the practical utility is not great.

Meanwhile, Korean Registered Patent No. 10-1296603 recently registered does not change the structure of the lower floor of a transmission and distribution board, but a support member capable of supporting internal components is provided at an inclination angle in the interior of a power plant, We proposed a switchboard structure that can be installed simply and inexpensively by design. This technology absorbs the impact of earthquake inside the switchgear and forms an inclined frame that can stably support internal parts such as circuit breakers, current transformers, booths, etc., so as to exhibit earthquake resistance. It is advantageous to strengthen the resistance against horizontal and vertical vibration by setting the structure to support the center horizontal point by the elasticity in both directions.

However, since the seismic structure using the inclined frame applied in this technique requires a plurality of inclined frames to be installed, it is not easy to install the circuit breaker on the side plate, and the circuit breaker must be supported using a separate elastic member. This is a technique that is not easy to apply in reality because it is inconvenient to assemble.

The present invention has been developed in order to overcome the problems and limitations of the prior art as described above, and it can be installed at a very simple and inexpensive cost compared to the prior art, and it is possible to provide a vibration damping device for each weight, And an object of the present invention is to provide a seismic resistant power transmission /

According to an aspect of the present invention,

A seismic isolation device installed on a lower rear surface of the cabin, a cabin provided on a lower rear surface of the cabin, and a bus bar on a rear surface of the cabin,

(1) The circuit breaker of the interrupter chamber is provided in a skeleton, and damping springs are provided between both sides of the skeleton and the side walls of the skeleton so that the horizontal vibration of the side walls of the switchboard is transmitted to the skeleton side wall And a vibration absorbing member is provided on a lower surface of the skeleton so as to absorb the vertical vibration and the horizontal vibration of the lower portion of the transmission and reception unit on the lower surface of the skeleton,

(2) In the current transformer of the cable room, a booth connected at the upper portion of the current transformer is provided with a damping spring under the separating wall of the cable thread and the bus barrel, so that the damping spring And a vibration absorbing member is provided on a lower surface of the current transformer to absorb the vertical vibration and the horizontal vibration of the lower portion of the power distribution board on the lower surface of the current transformer,

(3) The three-phase booth of the bus barrel is fixed by a spring bolt to a symmetrical C-shaped steel pad provided on the side wall of the busbar, so that the vibration of the side wall of the busbar is absorbed by the three-

The vibration absorbing member of (1) and (2) is composed of an outer column and an inner column, a ball bearing is provided between the outer column and the inner column, a spring bolt penetrates through the inner column, Thereby fixing the member.

The vibration-damping type earthquake-resistant switchboard structure to which the rigid-body-by-weight mode according to the present invention is applied exhibits seismic performance by providing a special device capable of absorbing vertical and horizontal vibration impacts for each device such as a breaker, a current transformer, By providing an accessory device that can absorb the shock waves transmitted from the frame of the switchboard in each of the devices inside the switchgear, it can exhibit the seismic performance by improving the resistance to vertical and horizontal vibrations. A sufficient earthquake-proof effect can be exhibited even if a rigid body of the present invention is used.

The seismic switchboard structure according to the present invention is completely different from the existing seismic switchboard structure and can be easily installed by fixing each device using a special device while maintaining the existing internal structure of the switchboard, It can be applied to general switchboards such as semi-high, high-voltage, low-voltage, motor control panel (MCC), and distribution panel.

Fig. 1 schematically shows the inside of a switchboard according to an embodiment of the present invention, showing a front view (left), a side view (middle), and a rear view (rear view).
Fig. 2 is a detailed view of the device of the "A" part in the switchboard according to Fig.
Fig. 3 is a detailed view of the device of the portion "b " in the switchboard according to Fig.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood, however, that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, and thus are not limitative of the scope of the invention.

FIG. 1 is a schematic view of the inside of a switchboard according to an embodiment of the present invention, showing a front view (left), a side view (middle), and a rear view (rear view) Fig. 3 is a detailed view showing the device of the portion "b" in the switchboard according to Fig. 1; Fig.

1 to 3, the earthquake-resistant power transmission /

And a bus chamber (C) provided on the upper rear surface. The vibration isolation device is provided for each device, so that the entire transmission / As a seismic resistant switchboard,

(1) The circuit breaker 10 of the cutoff chamber A is provided in the skeleton 11, and both side portions of the skeleton 11 are connected to the damping springs 12a and 12b between the power distributing side wall 12 and the skeleton side wall 11-1 damping springs 13 are provided to absorb the horizontal vibration of the side walls of the power transmission and reception unit 12 by the damping springs 13 on the side walls of the skeleton 11. The vibration absorbing member 14 is provided on the lower surface of the skeleton 11, The vertical vibration and the horizontal vibration of the lower part of the switchgear are absorbed on the lower part of the skeleton,

(2) In the current transformer 15 of the cable chamber B, the booth 16 connected to the upper portion of the current transformer is provided with a damping spring 18 below the separating wall 17 of the cable thread and the bus barrel, Absorbing member 19 is provided on the lower surface of the current transformer so that the vertical vibration and the horizontal vibration of the lower portion of the power transmission / Absorbing the effect on the lower surface,

(3) The three-phase booths 20-1, 20-2 and 20-3 of the bus barrel are fixed to the symmetrical C-shaped steel pads 22 provided on the power transmission side wall 21 by the spring bolts 23, So that the vibration of the side wall absorbs the influence of the three-phase booths 20-1, 20-2, and 20-3.

3, the vibration absorbing members 14 and 19 of the above (1) and (2) are constituted by an outer column 31 and an inner column 32, And the spring bolt 34 is passed through the inner column to fix the vibration absorbing member to the lower portion of the partition wall of the bus barrel 35 or the cabin compartment .

2, the symmetrical C-shaped steel pads 22 in the earthquake-resistant power switchboard structure according to the present invention are arranged such that both side ends (AA 'end faces) (AA 'cross-section) formed with the opening is formed such that the spring bolt is fastened from the lower part to the upper part to form the symmetrical C-shaped section The intermediate portion (BB 'end face) where the opening is formed on the upper side is formed by inserting the insulator (24) supporting the three-phase booth by fastening the spring bolt (23) And is fixed to the C-shaped steel pad 22.

In the present invention, the influence of the earthquake resistance of the above-mentioned switchboard is based on the following physical theory.

That is, the acceleration applied to each device installed inside the switchboard causes vibration, and when this vibration matches the natural vibration, the vibration is amplified and resonance phenomenon occurs. Therefore, it is necessary to precede high-frequency analysis by dynamic analysis through model analysis.

Due to the structural difference of each device in the switchboard, resistance to shock and vibration is different, and natural frequency is also different.

The natural frequency (f) of each device is proportional to the stiffness (k) of the structure and inversely proportional to the mass (m). In particular, the weight located far away from the restraint position has a natural frequency .

In this case, the natural period (T) is calculated as the reciprocal of the natural frequency (T = 1 / f)

Since the mode shape has a low-order mode from the deformable shape of the device at the natural frequency, that is, the shape that can be easily deformed into the vibrating shape, the possibility of occurrence of the mode shape in the device becomes lower as the device moves to the higher-order mode.

In addition, when the natural frequency of the device and the operating frequency due to the earthquake are close to each other, a considerable amplitude of vibration is generated. If the frequency of the vibration is longer than a predetermined time, resonance occurs.

In order to adjust the natural frequency in the enclosure of the switchgear, it is necessary to increase the stiffness outside the structure, reduce the mass, and re-bounce the weight within the structure.

The rigid body mode also occurs when the device is not sufficiently constrained in the flow direction of the device. That is, it may occur when a flat plate is placed on a hinge or a ball joint, or when two parts of the device are not properly connected.

In order to maintain the lateral force (10 kgf or more), shear force (100 kgf or more), and bending moment (10 tf.cm or more) of the support since the seismic frequency overlaps with the natural frequency, a strong support is used as an adaptation or rigid- .

The unrestrained structure is to be connected by ball joints or multiple layers of steel or rubber with a high damping coefficient.

The present invention is equipped with a vibration suppression device for each weight, so that it is less in weight compared to the existing seismic transmission and distribution board, and it can be applied only to the supporting platform unlike the existing seismic transmission and distribution board, thereby realizing an earthquake- .

To this end, the vibration frequency applied to the internal conductor, the breaker, and the current transformer of the switchgear is made less than the resonance frequency.

For this purpose, the breaker skeleton supports the vertical load sufficiently, and it has a very smooth sliding support like the ice plate in the horizontal direction, realizing the seismic structure, the bus line is the spring type suspension type and realizes the seismic structure, , That is, the breaker, the current transformer and the bus line are characterized in that a damping spring is applied to the breaker terminal portion so that relative displacement due to the difference of the natural frequency does not occur.

As described above, the seismic isolation and power-sharing system according to the present invention exhibits seismic performance by providing a special device capable of absorbing the vertical and horizontal vibration impacts of each device such as a breaker, a current transformer, and a bus in the switchgear. By providing an accessory device that can absorb the shock waves transmitted from the frame of the switchboard by each device, it can exhibit the seismic performance by improving the resistance to vertical and horizontal vibration, and it has a lower weight and a lower strength than the existing seismic switchgear. A sufficient adiabatic effect can be exhibited. In addition, it can be easily installed by fixing each device by using special device while maintaining the existing internal structure of the switchgear, and it can be easily installed in a general switchboard such as special high voltage, high voltage, low voltage, MCC, Without limitation.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the appended claims. You will understand.

10: Breaker 11: Skeleton
11-1: Skeleton side wall 12: Switching side wall
13: damping spring 14: vibration absorbing member
15: Current transformer 16: Booth
17: separation of cable and bus barrel wall 18: damping spring
19: vibration absorbing members 20-1, 20-2, and 20-3: three-phase booth
21: the power transmission side wall 22: the C-shaped steel pad
23: spring bolt 24: insulator
31: outer column 32: inner column
33: Ball bearing 34: Spring bolt
35: Switchboard

Claims (2)

A seismic isolation device installed on a lower rear surface of the cabin, a cabin provided on a lower rear surface of the cabin, and a bus bar on a rear surface of the cabin,
(1) The circuit breaker of the interrupter chamber is provided in a skeleton, and damping springs are provided between both sides of the skeleton and the side walls of the skeleton so that the horizontal vibration of the side walls of the switchboard is transmitted to the skeleton side wall And a vibration absorbing member is provided on a lower surface of the skeleton so as to absorb the vertical vibration and the horizontal vibration of the lower portion of the transmission and reception unit on the lower surface of the skeleton,
(2) In the current transformer of the cable room, a booth connected at the upper portion of the current transformer is provided with a damping spring under the separating wall of the cable thread and the bus barrel, so that the damping spring And a vibration absorbing member is provided on a lower surface of the current transformer to absorb the vertical vibration and the horizontal vibration of the lower portion of the power distribution board on the lower surface of the current transformer,
(3) The three-phase booth of the bus barrel is fixed by a spring bolt to a symmetrical C-shaped steel pad provided on the side wall of the busbar, so that the vibration of the side wall of the busbar is absorbed by the three-
The vibration absorbing member of (1) and (2) is composed of an outer column and an inner column, a ball bearing is provided between the outer column and the inner column, a spring bolt penetrates through the inner column, Thereby fixing the member.
[2] The apparatus of claim 1, wherein the symmetrical C-shaped steel pad is provided such that openings are formed in both sides of the symmetrical C-shaped steel pad downwardly, and the intermediate portion is formed such that an opening is formed on the upper side, The symmetrical C-shaped steel pad is fastened to the fixing base of the side wall of the power distribution panel, and the middle part having the opening formed at the upper side is fixed to the symmetrical C-shaped steel pad by fastening the spring bolt in the downward direction, Wherein the first and second seismic resis-

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