JPS5889007A - Power distribution device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (,) Description of the Technical Field The present invention relates to a power distribution device comprising a plurality of self-standing unit panels arranged side by side, and to an earthquake-resistant structure thereof.

(b) *Description of the prior art Generally, when a closed switchboard (hereinafter referred to as a board) enters a resonance state due to vibrations such as an earthquake, the response magnification of acceleration or displacement becomes extremely large. Therefore, a large acceleration is applied to the equipment stored in the panel, the relay mounted on the door, etc. As a result, there is a risk that damage to the wire connection section or fixture fixing section will cause the relay to malfunction and become inoperable.

For this reason, the frame of a board made by one person is required to have a natural frequency of 20H or more, for example. Possible measures to improve earthquake resistance include increasing the size of the bolts used to connect the foundation and the board, and, most importantly, strongly connecting the structural members of the board frame to each other by welding. However, increasing the strength of the panel frame members against earthquake acceleration in this way increases costs and is not an effective measure.

Furthermore, if the boards are arranged in rows on multiple sides, the earthquake resistance may actually decrease. Figure 1 shows a board 2.2' with multiple sides.

2"... are installed on the floor l in a row-by-panel configuration.

Figure 2 is an excerpt of the board 2 and 21 part of the row-of-board configuration in Figure 1, and shows the natural frequencies in direction A along the row-row direction and direction B that is perpendicular to this. and becomes as follows.

Generally, the frequency 1 is the reciprocal of the period T, and the spring constant (K) is calculated by the following formula (%): K - load (P) / deflection (J
), and the deflection δ is therefore the incoming vibration W! L/(person) is calculated from the following formula7
Sign.

, Therefore, if you increase the number of columns 11, the numerator will increase more than the denominator, and the frequency! (m) tends to be higher depending on the row of panels.

On the other hand, the frequency/(B) of the vibration in the B direction of the board 2 is not necessarily equal to the frequency/(B') of the rock 21, but is often different. Therefore, the mass of the board 2 is m
It is assumed that the mass m' of K112' is borne at a rate of X, and at the same time, the disk width W8 contributes at a rate of X to the condition of the disk width W. Therefore, the frequency /(B) is expressed by the following formula. However, the state of parallel plates with connecting bolts 3 is often not a rigid body, and the ratio of increase in the numerator and denominator of /(B) is W1 +
W, x...<m+1g@1x... When increasing the number of rows of plates, the frequency f(B) tends to decrease.

In addition, the results shown in FIG. 3 were obtained in actual verification.

(c) Purpose of the Invention The purpose of the present invention is to solve the problem of:
The present invention provides a power distribution device that prevents deterioration in seismic resistance due to rows of panels by improving the connection structure between panels.

(d) Structure of the Invention The structure of the present invention will be described in detail below with reference to an embodiment shown in FIGS. 4 to 7.

Here, as is clear from the above explanation, the unit self-standing board,
'For example, when a closed switchboard is configured with multiple panels in rows, as the number of panels in rows increases, the vibration M) in the front-rear direction of the panels, which is perpendicular to the direction of the panels in rows, decreases. The frequency in the above direction/(B) is not less than the natural frequency required for earthquake resistance, for example, 20 Hz.The connection force between the units is weakened to separate the 111111 bodies between them. Here, the above-mentioned alignment refers to a function row unit whose frequency (f) does not fall below 20 Hz even when the boards are arranged side by side, or each unit itself is normally constructed so that its frequency does not fall below 20 Hz. Therefore, it refers to the nest position based on one surface of the unit self-standing board.

In other words, by weakening the connection force between the above-mentioned side-by-side panel units or between one surface of each independent unit, a power distribution device that is in good condition and becomes a group on the system is constructed by weakening the connection force between the above-mentioned side-by-side panel units or one side of each independent unit. Prevent sexual decline.

A group of power distribution devices on the IK system of the embodiment shown in FIG. 4 are constructed of a plurality of independent unit panels (hereinafter simply referred to as panels) 4-1
．． 4-2.4-3...They are interconnected and configured in a nine-row board configuration. 9. In this embodiment, each unit is constructed as one self-supporting board whose natural frequency is not less than the value required for earthquake resistance. Therefore, each of these boards 4-1.
4-2, 4-3... are connected by a plate fastening member, so that the connection force is increased (IIt#), and rigid body separation is avoided.

That is, as shown in FIG.
As shown in the figure, attach the adjacent side frame 4-a of each board) 6
Connect Yosho. Here, the fastening member 5 is constructed by welding a plate material 51 and a collar 5b to the side frame 4-a, as shown in FIG. As shown in FIG. 7, the plate 5att is attached to the side frame 4-a so as to protrude from the width X of the A-side frame 4-a by the thickness y, and is supported by the collar 5b. As shown in FIG. 6, when connected, bolts 6 passing through each side frame 4-a1 collar 5b and plate material 5a are fastened together.

(1) Effect of the invention Next, the effect of the invention will be explained. In FIG. 4, the boards 4-1, 4-2, 4-3 are stacked side by side via the fastening member 5, so that a slight gap (2y) is created from this and they are stacked side by side. Therefore, when the plates are lined up, force is transmitted to the upper fastening member! This is done only through

In other words, even if each board 4-1.4-2.4-3 is configured in a row, the force is transmitted to the adjacent board in the front-rear direction of the fastening member 5 through the small gap (2y) K between each trowel. It is done through

For this reason, the wear between each board is substantially reduced, and the connecting force between the boards is reduced, resulting in an effect equivalently similar to that of a single rock installation in which the boards are not lined up. Therefore, since it is not affected by the arrangement of parallel plates, it is possible to prevent the natural frequency of the plates from decreasing due to the arrangement of plates.

(f) Other embodiments - In the embodiment shown in Fig. 8, the connections between the panels 4-1 and 4-2 are consciously made with respect to the connection holes 3-1 to 3-6 that originally need to be tightened. For example, 3-1. Only two places, 3-6 and 3-6, were tightened. That is, the connection between the boards is such that only a connecting force is generated for positioning each board so that it forms the same surface when the boards are installed. With this configuration as well, since each plate is rigidly separated, a reduction in the natural frequency of locks in the longitudinal direction of the lock in the row of plates is prevented, and the same effect as described above is produced.

In other words, even if the plates are arranged in parallel, the fastening effect of the rounded fastening portion of the plates in the series is reduced, and the m-condition is established, which is the m-condition, and the reduction in the natural frequency is eliminated. 9. The above function will occur if the connection force between the panels is weakened, so when arranging the panels, firmly connect the panels and lift them into position as described above, then remove all the connecting bolts between the panels. Alternatively, only the force exerted by the two face plates may be generated between the plates. In this case, each panel is firmly assembled on a common channel pace, so there is no problem with the installation strength. By shortening the thickness 2 of the collar 5b, it is completely impossible to handle the plate material 5atll. Even with this configuration, the board connecting force is weakened, and the same effect as described in # can be obtained.

In the present invention, as shown in the above embodiments, each board is rigidly separated by weakening the connection force between certain rows of board units, but the connection force sf is different from that of the normal Fed By reducing the coupling force to about 1/2 or less, the natural frequency does not decrease.

ω Comprehensive effect 1 As described above, according to the present invention, when configuring a multi-sided unit self-standing panel in a row, the distance between the units is usually not less than the natural frequency required for earthquake resistance. For the connecting force of
Since the connection is made with a weak connection force of about 1/2 or less, a rigid body separation is achieved between them, and it is possible to prevent a decrease in earthquake resistance in the longitudinal direction of the lock due to the n1 row Sakaki configuration.

[Brief explanation of drawings]

Figure 1 is a block diagram of a typical closed switchboard, Figure 2 is a diagram of two sides of Figure 1, and Figure 3 shows the conventional panel configuration and its unique frequency in the front-rear direction of the lock. Characteristic diagram showing the relationship between
FIG. 5 is a front view showing one embodiment of the power distribution device according to the present invention, FIG. 5 is a perspective view showing the unit self-standing board used in FIG. 4, and FIG. 6 is a partial view showing the connecting line in FIG. 4. , Figure 7 is the fifth
FIG. 9 is a perspective view showing details of the tightening member in the figure, and a perspective view and a partial view showing other embodiments of the present invention along the lines of FIGS. 8 and 9, respectively. 4-1.4-2.4-3...Unit self-supporting board, 5...Inter-board fastening member 6...Connecting bolt. (7317) Attorney Noriyuki Chika (Haga1)
name) 1st ward 2- Fig. 3 72・1r→ Fig. 4 Fig. 5 Fig. 7

Claims (1)

[Claims] In a power distribution system consisting of a plurality of unit self-standing panels arranged side by side, the natural frequency in the lock longitudinal direction perpendicular to the direction of the rows is not less than the natural frequency required for earthquake resistance. 9. A power distribution device characterized in that the space is connected by a connection force of about v2 or less, which is difficult to connect with a normal side-by-side configuration, and the space is rigidly separated.