JPH0537605Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Technical field to which the idea belongs) This invention relates to the structure of a multi-tier closed switchboard.

(Prior art and its problems) FIG. 3 shows a schematic side sectional view of this type of multi-tier closed switchboard in the case of three stacks. 1 ₁ , 1 ₂ , 1
₃ is the door or cover, 2 ₁ , 2 ₂ , 2 ₃ is the circuit breaker room,
3 _1a , 3 _1b , 3 _2a , 3 _2b , 3 _3a , and 3 _3b are live parts protruding from the circuit breaker room, and 4 is a cable room.
The circuit breaker rooms 2 ₁ , 2 ₂ , 2 ₃ are divided into stages as shown in the figure, but the cable room 4 is divided into sections, for example.
Even when compared with the JEM standard, it is not necessary to divide the room according to the standard, so each stage is usually formed as one room. However, for reasons such as expansion, for example, when the first and second stages are in operation and cannot be suspended, in order to install an external line cable for the third stage, the first stage must be installed. , the second-stage charging parts 3 _1a , 3 _1b , 3 _2a , and 3 _2b are charged, which is extremely dangerous. In order to avoid this dangerous situation, the first stage and second stage live parts 3 _1a and 3 _1
b , _32a , and _32b may be temporarily covered with an insulating sheet or protective cover and an external cable for extension to the third stage is laid. However, it is dangerous to put an insulating sheet or a protective cover on it, even if it is only temporarily, and there is also the problem that the installation state of the insulating sheet or protective cover is unstable.

(Purpose of the invention) In view of the above-mentioned circumstances, this invention is to enable the installation of external line cables for expansion safely in multi-stage closed switchboards even when other closed switchboards are in operation due to reasons such as expansion. With the goal.

(Key Points of the Idea) The key points of this idea are that closed switchboards consisting of a circuit breaker room and a cable room are stacked in multiple tiers, and each tier's cable room is separated from each other by a partition plate. Seal the cable room
A partition that allows external cables to be inserted separately from the outside of the distribution panel into the cable rooms of each level by penetrating the bottom wall of the lowest cable room or the ceiling wall of the uppermost cable room, and the partition plate between each level of cable rooms. By introducing pipes and drawing the outside line cables into the respective cable rooms through these partition pipes, the danger of electric shock from live parts during work on the outside line cables can be prevented.

(Embodiment of the invention) FIG. 1 is a schematic side sectional view of a multi-tiered closed switchboard which is an embodiment of the invention. In this multi-tier closed switchboard, partition plates 5 ₁ , 5 ₂ are provided in each tier to divide the cable rooms 4 ₁ , 4 ₂ , 4 ₃ into three tiers. A partition pipe 6 ₁ whose tip is introduced into the second tier cable chamber 4 ₂ by passing through the partition plate 5 ₁ between the first and second tiers.
Similarly, a partition pipe 6 ₂ is provided which penetrates the bottom wall and the partition plates 5 ₁ and 5 ₂ between the first and second stages and between the second and third stages and whose tip is introduced into the third stage cable room. When laying the cables 7 ₂ , 7 ₃ , use the partition pipes 6 ₁ , 6 ₂ as guides to guide the lead-in charging section 3
If connections are made with _2a and _33a , there is no risk of being exposed to dangers such as electric shock even if live parts in other stages are being charged. FIG. 2 shows a modification of the embodiment shown in FIG. 1, and the difference from FIG. 1 is that the external line cable 7 ₁
7 ₂ and 7 ₃ are drawn in from the top of the switchboard. In other words, it hangs down from the cable duct 8 provided at the top of the switchboard, and its tips connect to the ceiling wall of the cable room at the top level and the partition plate 5 between each level.
Partition pipes 6 ₁ , 6 ₂ , 6 ₃ are provided which penetrate through the cable chambers ₂ to 5 ₁ and are introduced into the cable chambers 4 ₁ , 4 ₂ , 4 ₃ .

(Effects of the invention) In this invention, a partition plate and a partition pipe are provided in the cable room of the switchboard, so that when installing external line cables, the partition pipe can be pulled in as a guide, and the installation can be done without opening the door or cover. It is extremely safe. Also, the partition pipe can be used as an air intake and as part of the cooling system for the power distribution board.

[Brief explanation of the drawing]

Fig. 1 is a side schematic sectional view of a multi-stage closed switchboard which is an embodiment of this invention, Fig. 2 is a side schematic sectional view showing a modification of the embodiment of Fig. 1, and Fig. 3 is a multi-stage closed switchboard with a conventional structure. FIG. 2 is a schematic side sectional view of a stacked and closed switchboard. 2 ₁ , 2 ₂ , 2 ₃ ...breaker room, 4 ₁ , 4 ₂ , 4 ₃ ...
... Cable room, 5 ₁ , 5 ₂ ... Partition plate, 6 ₁ , 6 ₂ ,
6 ₃ ... Partition pipe, 7 ₁ , 7 ₂ , 7 ₃ ... External line cable.

Claims (1)

[Scope of utility model claims] In a closed switchboard consisting of a circuit breaker room and a cable room, stacked in multiple tiers, each tier's cable room is separated from each other by a partition plate, and each tier's cable room is hermetically sealed. Introducing a partition pipe that allows external line cables to be inserted into each tier of cable rooms separately by penetrating the bottom wall of the lower tier cable room or the ceiling wall of the top tier cable room and the partition plate between each tier of cable rooms. A multi-stage closed switchboard characterized by the fact that external line cables are drawn into their respective cable rooms through these partition pipes.