JPH0613536Y2 - Closed switchboard - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] This invention is a TR board containing a transformer and an M containing a plurality of circuit breakers connected to the secondary side of the transformer.
The present invention relates to a closed switchboard composed of a CB board, and particularly to improvement of a method of operating, maintaining and inspecting from the front side of a TR board and an MCB board.

[Conventional technology]

Traditionally, a TR that houses a transformer (hereinafter referred to as TR)
In a closed switchboard consisting of a panel and an MCB panel that houses a plurality of circuit breakers (hereinafter referred to as MCBs) connected to the secondary side of the TR, these operations, maintenance, and inspections are performed only from the front side. There is a thinner type, and it is particularly popular as a power receiving and distributing facility for buildings and the like where it is desired to reduce the space of the electric room.

As a layout of this thin closed switchboard,
There is a method of arranging the boards in one row along the wall of the electric room or arranging them in a two-row back-to-back arrangement. In either case, the TR board and the MCB board are arranged in the left-right row board. .

For example, Fig. 8 shows an outline of the 6000V power receiving and distributing equipment. In the center of the electric room (1), a load switch (hereinafter referred to as LBS) is installed.
(2), TR (3) and current transformer (hereinafter referred to as CT)
A plurality of closed distribution boards (A ₁ consisting of a TR board (5) accommodating (4) and an MCB board (7) accommodating a plurality of MCBs (6) connected to the secondary side of TR (3) ) ~ (A ₆ ) are the TR discs
(5) and the MCB board (7) are arranged side by side in the left-right direction and are arranged back to back in two rows.

In addition, (B) is a board containing the transformer (8) for transaction and the disconnector (9).
(C) and a panel (16) containing a circuit breaker (11), a CT (12), a lightning arrester (13), a power fuse (14), and an instrument transformer (15), (C) ) Is a capacitor board for accommodating the disconnect type power fuse (17), the vacuum switch (18), the series reactor (19) and the power factor improving capacitor (20), and is drawn from the capacitor board (C). Each high-voltage main bus (21) is a TR board
It is connected to the primary side of TR (3) in (5) via LBS (2). (22) is a low voltage main bus connected to the secondary side of each TR (3), and each MC in the MCB board (7)
The power supply side terminal of B (6) is connected to the low voltage main bus (22). (23) is a low voltage cable connected to the load side terminal of each MCB (6).

By the way, the conventional closed switchboard has its TR board (5)
The MCB board (7) is constructed as shown in FIGS. 10 and 10, and is constructed as shown in FIGS. 11 to 13.

That is, in the TR board (5), TR (3) is arranged at the bottom of the board and LBS (2) is arranged at the top, while high voltage of three phases in the left and right direction is provided at the ceiling of the board through the support insulator (24). The main busbar (21) is supported, and this high-voltage main busbar (21) supports the left and right support cleats.
While being connected to the insulated wire (26) supported by (25),
It is connected to the high voltage main bus (21) in another TR board (5) through the adjacent board, that is, the MCB board (7).

The high voltage branch conductors (27) lowered from the high voltage main bus (21) are connected to the respective terminals of the LBS (2), and the high voltage branch conductors (28) from the LBS (2) are supported by the cleat. They are connected to the primary side terminals (30a) of TR (3) through (29), respectively.

In addition, between the LBS (2) and TR (3) in the TR board (5),
The low-voltage main bus (22a) in the left-right direction is arranged in the front-rear direction and supported by the support cleat (31),
CT (4) is attached to this, and each secondary side terminal (30b) of TR (3) is connected to each low voltage main bus (22a) via a flexible conductor (32).

In addition, in FIG. 9 and FIG. 10, (33) is a TR board (5)
The ventilation box installed on the upper surface of the, (34) is the gutter board that forms the control wiring room (35) in the left-right direction on the upper front side in the TR board (5), (3
6), (37) and (38) are transparent resin shielding plates, (39) is a door, (40) is a dial thermometer, and (41) is a ground busbar.

On the other hand, in the MCB board (7), a vertical mounting base (42) is fixed to the center of the rear surface of the inside of the board, and the power supply side terminals on the left and right side surfaces and the other left and right side surfaces on the front surface of the mounting base (42) A plurality of MCBs (6) each having a load side terminal are mounted in multiple stages, and the vertical low voltage main bus (22b) supported by a support cleat (43) on one side of the panel is the TR It is connected to the low voltage main bus (22a) introduced from the panel (5), and the power supply side terminals of each MCB (6) are connected to this low voltage main bus (22b) through the low voltage branch conductor (44). Has been done.

Here, the closed switchboard (A ₁ ), (A ₂ ), (A ₄ ), (A ₅ ), T
When the capacity of R (3) is large and the MCB board (7) has a two-sided structure, the low voltage main bus (22a) from the TR board (5) is installed in the lower part of the MCB board (7). , A low-voltage main bus (22c) in the left-right direction supported by the support cleat (43) is provided, and the low-voltage main bus (2c) of the MCB board (7) is connected via the low-voltage main bus (22c).
2b) is connected to the low voltage main bus (22d) vertically arranged on the negative side in the adjacent MCB board (7).

Further, a partition plate (46) that forms a space (45) for penetrating the insulated wire (26) from the TR board (5) in the upper part of the MCB board (7).
Is provided, and a gutter board (48) that forms a control wiring room (47) in the left-right direction is attached to the front surface of the TR board (5) and the MCB board (7). , (47) communicate with each other.

11 to 13, (49) is a metal shielding plate, (50) is a metal protective door, (51) is a transparent resin bus bar cover, and (52) is a door.

By the way, in the MCB board (7), the low-voltage cables (23) connected to the respective load-side terminals of each MCB (6) are pulled out of the board from above or below. It is often placed on a cable rack suspended from the ceiling of the electrical room (1) for wiring, and therefore,
In many cases, the low-voltage cable (23) is pulled out from the top of the board.

Therefore, in the ceiling part of the MCB board (7), a space for control wiring (control wiring room (47)), a through space (45) for the high voltage main bus (insulated electric wire (26)) and a low voltage cable (23) ), The drawing space will be formed respectively.

[Problems to be solved by the invention]

However, in the conventional closed switchboard, the TR board (5) that houses the TR (3) and the MCB board that houses a plurality of MCBs (6) connected to the secondary side of the TR (3) in multiple stages ( Since 7) and 7 are arranged in the left-right direction, they have the following drawbacks.

(i) When a plurality of closed distribution boards (A ₁ ) to (A ₆ ) are installed side by side like the power distribution equipment shown in FIG. 8, the high voltage main bus (21) in each TR board (5) ), A high-voltage main bus (insulated electric wire (26)) unrelated to the MCB board (7) will penetrate into the MCB board (7), resulting in poor safety and unnecessary use. Since the high voltage main bus is routed around, the mother dose (electric wire amount) increases and the economy is poor.

(ii) As described above, since the through space (45) for the high voltage main bus is formed in the MCB panel (7), the space for pulling out the low voltage cable (23) from each MCB (6) outside the panel is narrowed, The workability of pulling the cable into the panel is poor.

(iii) It is necessary to form a control wiring room (47), a high voltage main bus penetration space (45) and a cable drawing space in the ceiling part of the MCB panel (7), and also a high voltage main bus penetration space (45). As a result, the insulation dimensions of the high-voltage main bus bar, which is a bare conductor, cannot be secured beyond the standard value.
You must use (26).

In this case, the high voltage main bus (21) of the TR board (7) and the other TR board (5)
The high voltage main bus (21) of is connected to the M
Since the CB board (7) must be connected by the insulated electric wire (26) that is passed through the CB panel, the insulated electric wire (26) must be temporarily removed and then reattached for transportation after assembly at the factory. The assembly workability is very poor.

(iv) The low voltage main bus (22a) connected to the secondary side of the TR (3) must be provided in the TR board (5), the amount of conductor used increases and the capacity of the TR (3) is large. For things MCB board (7)
In this case, the low-voltage main buses (22a) to (22d) of a size commensurate with the rated current of TR (3) are used for the two-sided MC.
Since it has to be provided over the board B (7), the amount of conductor used further increases, and the economy is poor.

(v) In the MCB board (7), the TR board (5) side is used as the power source side, and the low voltage main buses (22b) and (22d) are attached.
Depending on the left-right arrangement relationship between the panel (5) and the MCB panel (7), for example, the MCB panel (7) in the closed switchboard (A ₁ ) and the MCB in the closed switchboard (A ₂ ) back-to-back with it. Like the panel (7), the power supply side is the MCB panel on the right side and the MCB panel on the left side
(7) and exist, and they are installed together in one facility, so there is no uniformity and it is inconvenient in operation.

So, in this invention, paying attention to the above points, TR
It consists of a panel and an MCB panel, and operation / maintenance / only from the front side
It is a technical object to provide a means capable of improving safety, omitting member conductors, facilitating assembly, improving workability of a low-voltage cable, etc., in a closed switchboard of an inspection type.

[Means for solving problems]

This device is a transformer board (TR) that houses a transformer (TR).
Panel), a high-voltage main bus bar connected to the primary side of the TR and arranged in the upper part of the TR panel, and formed to have the same dimension width as the TR panel and arranged back to back to the TR panel. A circuit breaker board for wiring (MCB board), a low voltage main bus arranged vertically in the MCB board and connected to the secondary side of the TR via a conductor, and stored in multiple stages in the MCB board. It is a closed switchboard provided with a plurality of wiring breakers (MCBs), each terminal on the power supply side being connected to the low-voltage main bus.

[Action]

Therefore, in this invention, since the MC board containing the MCBs is arranged back to back with respect to the TR board containing the TRs, the high-voltage main bus bar arranged in the upper part of the TR board is MCB.
It does not penetrate through the inside of the board, and the low-voltage main bus arranged vertically in the MCB board is connected to the secondary side of TR in the TR board via, for example, a flexible conductor, and No low voltage main bus is provided.

Furthermore, since there is no left-right restriction on the position of the low-voltage main bus bar of the MCB panel, when accommodating the MCBs in multiple rows in two rows, the low-voltage main bus bar is placed in the center of the MCB panel,
When the MCBs are arranged in multiple rows in two rows on both sides of the MCBs and the MCBs are stored in multiple rows in one row, the low voltage main busbars can be moved to one side of the MCB board to arrange the MCBs in multiple rows.

〔Example〕

Next, the present invention will be described in detail with reference to FIGS. 1 to 7 showing its embodiment. The same symbols as those used above indicate the same or corresponding ones.

First, FIGS. 1 to 4 showing the first embodiment will be described.

What is shown in these drawings is a case where the capacity of TR (3) is large, and a plurality of MCs connected to the secondary side of TR (3) are connected.
B (6) is stored in two rows in multiple stages.

That is, in the upper part of the TR board (5) that accommodates the TR (3) in the lower part, three-phase high-voltage main buses (21) in the left-right direction are supported by the support insulators (24), and from the high-voltage main bus (21). The lowered high voltage branch conductor (27) is connected to the LBS (2) and
High-voltage branch conductor (28) from BS (2) is the primary side terminal of TR (3)
It is connected to (30a). In addition, the secondary side terminal (3
0b) is located on the rear surface side of the TR board (5), that is, on the opposite side of the door (39).

The MCB board (7) is formed to have the same width as the TR board (5) and is arranged back to back with respect to the TR board (5). In this case, there is no partition between the TR board (5) and the MCB board (7), and they are in communication with each other.

Then, in the MCB board (7), a low-voltage main busbar (22) of three phases in the up-down direction is supported and provided by a support cleat (31) in the central portion thereof, and each low-voltage main busbar (22) is provided. TR
Each of the secondary side terminals (30b) of (3) is connected via a flexible conductor (32), and the CT (4) is attached to the flexible conductor (32).

Furthermore, a plurality of MCBs (6) are respectively stored on the left and right sides of the low-voltage main busbar (22) in the MCB panel (7) in a multi-tiered manner with the respective power supply-side terminals facing the center inside, Each MCB
Each power supply side terminal of (6) is connected to the low voltage main bus (22) via the low voltage branch conductor (44), and each MCB (6)
Low-voltage cables (23) connected to the respective load-side terminals of
However, it is pulled out of the board from above (or below) through the left and right inner sides of the MCB board (7).

In addition, (53) is a screw-stop type protection plate that covers the front surfaces of the low-voltage main bus (22) and the low-voltage branch conductor (44) in the MCB board (7),
(54) is an openable / closable protective plate that covers the front surfaces of the MCB (6) and the low voltage cable (23), and the MCB (6) is attached to the protective plate (54).
The operation square hole (55) is transparently provided, and the protection plate (5
A card holder (56) for a nameplate is provided at a position corresponding to each MCB (6) in 3).

Next, FIG. 5 showing the second embodiment will be described.

The figure shows a case where a plurality of MCBs (6) connected to the secondary side of the TR (3) are stored in one row in multiple stages.

That is, the TR board (5) containing the TR (3) is
The MCB board (7) having the same width as the board (5) is arranged back to back, and the three-phase low-voltage main buses (22) in the vertical direction are arranged on the left side of the MCB board (7). Together with each low voltage main bus (2
2) is connected to each of the secondary side terminals (30b) of TR (3) by a flexible conductor (3
0).

Furthermore, a plurality of MCBs (6) are provided in the center of the MCB board (7).
Are housed in multiple stages with their respective power supply side terminals facing left, and each power supply side terminal of each MCB (6) is connected to each low voltage main bus (22) via a low voltage branch conductor (44), The low-voltage cables (23) connected to the respective load-side terminals of each MCB (6) pass through the inside right side of the MCB board (7) and are led out of the board from above (or below).

When a plurality of MCBs (6) are stored in a row in the MCB panel (7), the low voltage main bus (22), the power supply side terminals and load side terminals of the MCB (6), and the low voltage cable (23 ) To the second
The embodiment may be configured so as to be laterally opposite.

Next, a case where the present invention is applied to each of the closed switchboards (A ₁ ) to (A ₆ ) in the power receiving and distributing equipment of 6000V shown in FIG. 8 will be described.

As shown in FIG. 6, the closed switchboards (A ₁ ) to (A ₄ ) having large TR (3) capacity are the same as those shown in the first embodiment.
The other closed switchboards (A ₅ ) and (A ₆ ) shown in the second embodiment are used, and the closed switchboards (A ₁ ) to (A ₆ ) are provided in the center of the electric room (1). But each TR board (5)
FIG. 7 shows the spaces between the respective high-voltage main buses (21) of the adjacent TR boards (5), which are arranged side by side with the comrades and the MCB boards (7) composing each other in the left-right row. like,
It is connected by a connecting conductor (57) at the board connecting portion.

[Effect of device]

As described above, according to the closed switchboard of the present invention, the TR board that houses the TR and the MCB board that houses a plurality of MCBs connected to the secondary side of the TR in multiple stages have the same width and width. By arranging them back to back, the following effects can be obtained.

(i) The high-voltage main bus required only for the TR board can be arranged only in the TR board, and it is not unnecessarily laid in the MCB board, so that safety and economy are improved.

(ii) The high-voltage main bus does not penetrate into the MCB board, and M
Since the ceiling part in the CB board can be widely used, a large space for drawing out the low voltage cable connected to the load side terminal of the MCB can be secured, and the workability of drawing the cable in the board becomes good.

(iii) Since the high-voltage main busbar is provided only in the TR panel, a large space can be provided for the penetration, and therefore the high-voltage main busbar of the bare conductor can ensure a sufficient insulation dimension, and it is not necessary to use an insulated wire. .

Furthermore, when connecting high voltage main busbars of multiple TR boards, the TR boards can be used as a row board and can be connected at the connecting parts of the boards, so assembling at the factory, dismantling during transportation, at the site. The workability of reassembly is greatly improved.

(iv) It is not necessary to provide a low-voltage main bus connected to the secondary side of the TR on the TR panel, and it can be arranged only in the MCB panel that requires this, which reduces the amount of conductor used and Compared to the one with a large TR capacity, the MCB panel does not need to be a two-sided structure, and the amount of conductor used on the low voltage main bus is significantly reduced (1 /
2 or less), and the economy is good.

(v) The low-voltage main bus in the MCB panel can be arranged in the center when the MCB is in two rows and in the right side (or left side) when the MCB is in one row, regardless of the TR panel. It can be unified into two types of structure.

[Brief description of drawings]

1 to 7 show an embodiment of a closed switchboard according to the present invention, and FIGS. 1 to 4 show a first embodiment.
Figure is a side view, Figure 2 is a plan view, Figure 3 is a front view when the MCB board door is removed, and Figure 4 is a rear view when the TR board door is removed (as seen from the TR board side). (Front view), FIG. 5 is a plan view of the second embodiment, and FIGS. 6 and 7 show the invention.
Fig. 6 is a schematic plan view, Fig. 7 is a rear view of an upper high voltage main bus bar portion of each TR panel (a front view seen from the TR panel side), and Fig. 8 when applied to a 6000V power receiving and distributing facility. The following shows a conventional example, FIG. 8 is a schematic plan view corresponding to FIG. 6, FIGS. 9 and 10 are front and side views with a part of the TR board removed, and FIG. 11 is a two-sided structure. Fig. 12 is a side view of the MCB board with part of the MCB board removed.
It is a top view of a CB board. (3) …… Transformer (TR), (5) …… Transformer (TR),
(6) …… Wiring circuit breaker (MCB), (7) …… Wiring circuit breaker board (MCB board), (21) …… High voltage main bus, (22) …… Low voltage main bus, (32)… … Flexible conductor.

Claims (1)

[Scope of utility model registration request] 1. A transformer board containing a transformer (hereinafter referred to as TR
Board), a high-voltage main bus connected to the primary side of the transformer and arranged in the upper part of the TR board, and formed to have the same dimension width as the TR board and arranged back to back to the TR board. Circuit breaker board for wiring (hereinafter referred to as MCB board) and the M
A low-voltage main bus that is vertically arranged in the CB board and connected to the secondary side of the transformer via a conductor, and multiple power supply side terminals that are housed in the MCB board and connected to the low-voltage main bus Switchboard with a plurality of circuit breakers for wiring.