JPH01152909A - Enclosed switchboard - Google Patents

Abstract

PURPOSE:To prevent the deformation and buckling of a switchboard by forming a circuit breaker chamber containing two DC circuit breakers which are stacked and providing a reinforcing member formed with an arch-shaped frame just under the upper circuit breaker in the chamber. CONSTITUTION:DC circuit breakers 4, 4' are disposed vertically in an enclosed switchboard 1 comprising a box body 1. An operating ring 12 for the upper circuit breaker 4, an breaking section 5, a supporting insulator 11 and a lower wheel 10 are arranged on a vertical line, and a tiled arch-shaped frame 13 with a reinforcing plate 14 is mounted just under the lower wheel 10. Operating force applied when the lower circuit breaker 4' is opened or closed is absorbed by the floor 11' of a building directly. Operating force F applied when the upper circuit breaker 4 is directed on the vertical line up to the wheel 10, and divided to two components of forces F' by the arch-shaped frame 13 and absorbed by the floor 11'. Accordingly, strong operating force is not dispersed to other parts, thus preventing the deformation and buckling of the switchboard.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention particularly relates to a multi-tiered closed switchboard housing DC circuit breakers.

[Conventional technology]

Multi-level stacking of closed switchboards has been widely used in the past, but the box body tends to be a monocoque type with thinner panels.
Methods such as duplication have been adopted as in Japanese Patent No. 15110.

In the conventional example, measures such as reinforcing the strength loss caused by thinning the plate or improving seismic resistance were not particularly taken into consideration, as measures against operating force when breaking the circuit breaker would not be a problem if it was a general frame structure. There wasn't.

[Problem that the invention seeks to solve]

However, when shutting off with direct current and in vacuum,
Because the gap between the electrodes is small and there is a risk that the circuit breaker may not be able to shut off due to slight deformation at the bottom of the circuit breaker, it has generally been stacked in one layer to apply the force to the floor (concrete) to prevent deformation.

When stacking DC vacuum circuit breakers in multiple stages, as shown above, for the lower stage, the operating force is applied directly to the floor of the building and the impact force is absorbed, but for the upper stage, etc., the force is dispersed and the frame deforms. There is a risk that it may occur. Moreover, it is necessary to minimize the effect of this force on other parts stored in the panel.

An object of the present invention is to transmit the breaking operation force of the DC circuit breaker installed in the upper stage to the floor surface with little loss, absorb impact force, and prevent failure to break due to deformation or the like.

[Means for solving problems]

The present invention forms a multi-layered breaker chamber in a closed switchboard,
A DC breaker is housed in a breaker room, and the part directly below the breaker part of the DC breaker is reinforced with a reinforcing member.

[Effect]

As a result, the reinforcing member bones are prevented from applying downward operating force when cutting off the DC breaker, thereby preventing deformation, buckling, etc. of the closed switchboard.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

In FIG. 1, a DC bus 2 is passed through a row of panels approximately in the center of the grounding case of a box 1, and from this bus 2, a sliding terminal 3 is passed through the box into two-tiered breaker chambers 4A and 4B. The circuit is cut off and turned on by the vacuum cutoff section 5 of the DC circuit breaker 4'4' housed in the . Via the load-side sliding terminal 3, it is connected to a fault selection current transformer 6 and a DC current transformer 7, and is supplied to an external load via a cable 8. 9 is a commutating capacitor for a DC breaker. These DC vacuum circuit breakers 4 and 4' differ from AC circuit breakers in that they break by passing a reverse current, so the operating force of the circuit breaker is extremely large, and that force is applied to the wheels of the vacuum circuit breaker. It is connected to the floor surface 11 of the switchboard through 10 and is absorbed and eliminated.

In the present invention, as shown in FIG. 3, first, a blocking portion 5 and a supporting insulator 11, which are sources of a large force point, are connected to each other. The operating ring 12 is installed in a straight line, and the force F is applied to the lower wheel 10 (2 in this figure).
(f) An inclined gate-shaped frame 13 is provided directly below the wheel 10 so that the load is received directly below the wheel 10 and all the load is transmitted in a straight line.

As a result, the force F' is transmitted through the inclined frame 13 and absorbed by the floor surface 11, thereby preventing the box 1 from deforming or buckling. Also, inclined shape frame 1
3 has one pole in the interrupting part 5 of the DC circuit breaker 4, 4',
It is sloped so that it is directly below the wheels. Breaker 4, 4'
The operating force is smaller on the front side of the circuit breaker, and the circuit breaker operating device is also thicker, so there is no need to add a slope. The outer periphery of the inclined frame 13 is provided with a closed reinforcement part 14 in the opposite direction so as to be able to sufficiently withstand the buckling of the column part 13 due to the force F'.
is provided, so even if component forces such as forces P and f are generated, it can be firmly supported.

FIG. 5 shows a case where the upper stage breaker chamber 4A is formed to protrude in the depth direction from the lower stage breaker 4B, and the reinforcing part 13' is provided only just below the breaker part 5 of the upper stage DC breaker 4. be.

〔Effect of the invention〕

As explained above, according to the present invention, the reinforcing portions are arranged so that the points of force are aligned in a straight line on both the circuit breaker side and the switchboard frame side, so that the strong operating force that is a feature of DC circuit breakers can be avoided. It can be quickly absorbed by the floor surface with minimal force without affecting other parts or equipment due to its dispersion, allowing for multi-level stacking without making the panel extremely strong or large. I can do it.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of the board side of an embodiment of the present invention, Fig. 2 is a front view as seen from the left side of Fig. 1 with the door open, and Fig. 3 is a view from the circuit breaker. A detailed view showing the transmission of force to the floor surface, FIG. 4 is a perspective view showing the structure of the reinforcing frame that receives the force point inside the panel, and FIG. 5 is a side sectional view of a closed switchboard shown as another embodiment of the present invention. It is. 1... Box body, 4... DC breaker, 5... Breaking part,
DESCRIPTION OF SYMBOLS 10...Wheel, 11...Support insulator, 12...Operation link, 13th L port 9 2nd concave 30'' 51st

Claims (1)

[Scope of Claims] 1. Forming a closed switchboard with multi-layered stacks and disconnection chambers,
What is claimed is: 1. A closed switchboard in which a direct current or a disconnector is housed in a breakout chamber, characterized in that the closed switchboard is reinforced by providing a reinforcing part directly below the cutout of the direct current or disconnector. 2. The closed switchboard according to claim 1, wherein the reinforcing portion is formed into a gate-shaped frame.