JPH0613535Y2 - Low voltage distribution equipment - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is a low-voltage board comprising a distribution transformer and a low-voltage panel containing a circuit breaker connected to the secondary side of the transformer. Regarding power distribution equipment.

[Prior Art] Conventionally, this type of low-voltage power distribution device has a configuration as shown in FIG. 7 to FIG.

That is, the distribution transformer (1) cannot be installed indoors where the height is limited because it is required to have a primary, secondary bushing and tap changer on the upper part of the distribution transformer (1), and it is installed outdoors and the primary cable is used. Is connected to the primary bushing from the ground through the cable box (2), and the busbar (3) connected to the secondary bushing is guided by the bus duct (4) to the building (5).
Has been introduced within. (6) is the radiator of the transformer (1).

On the other hand, in the building (5), for example, five low-voltage boards (7) are installed on the second floor, and the busbars (3) penetrate through the side surfaces above the respective low-voltage boards (7). .

Each of these low-voltage boards (7) are arranged as shown in FIG.
Two circuit breakers for wiring (upper and lower on the front mounting plate (8)
(B) (9) is attached and each power supply side terminal
While the (10) is connected to the bus bar (3) via the connection conductor (11), the current transformers for low voltage meters are connected to the connection conductors (13) connected to the load side terminals (12) of both MCBs (12). (14) is attached, and the load side cable 15 is attached to the end of the connection conductor (13).
Are connected, and this is pulled out from the upper surface.

In addition, the cables pulled out from the upper surface of each low-voltage board (7)
(15) is supported by the cable rack (16) above it.

In FIG. 8, (17) is a support for supporting the load side connection conductor (13) of the MCB (9), and (18) is a load side cable.
(15) Cable bracket, (19) Hook-type shield, (20)
Is the front door.

Then, in the conventional device as described above, when a load is added, as shown by a chain double-dashed line in FIG. 7, an expansion low-voltage board (7) accommodating two circuits (feeders) of MCBs (9). 'Is installed in a row.

[Problems to be solved by the invention]

However, in the above-mentioned conventional device, the transformer (1) and the low-voltage panel (7) accommodating the MCB (9) connected to the secondary side of the transformer (1) are separately installed, and due to the height limitation indoors, the transformer is not installed. Since the transformer (1) will be installed outdoors, not only will the installation space for these electrical installations increase, but the busbar conductor and bus duct (4) that connect the transformer (1) and the low-voltage panel (7) will also increase. It is particularly necessary and has the drawback of being expensive.

Further, since the inspection work that requires a power outage is indoors and outdoors, it is troublesome and time-consuming, and in particular, the outdoor portion of the transformer (1) and the bus duct (4) has a drawback that it is difficult to perform the inspection work in the rain.

In view of the above, it is a technical object of the present invention to provide a low-voltage power distribution device that can reduce the installation space and the total cost while paying attention to the above points.

[Means for solving problems]

The low-voltage power distribution device of the present invention comprises a primary bushing provided on one side of a distribution transformer and connected to a primary side terminal of the transformer, and two transformers provided on both sides of the primary bushing. A secondary bushing branched and connected to a secondary side terminal, a low-voltage board installed at a position perpendicular to the one side surface from the both secondary bushings, and a power supply side housed in the both low-voltage boards, respectively. And a circuit breaker for wiring connected to both secondary bushings.

[Action]

In this invention, since the primary bushing is provided on one side of the distribution transformer and the secondary bushing is provided on both sides thereof, the height of the transformer is reduced, and there is no maintenance surface on the upper surface of the transformer. Therefore, it becomes easy to install the transformer together with the low-voltage panel indoors where the height dimension is restricted.

Further, since the low-voltage boards containing the circuit breakers connected to the secondary bushings are installed at the positions perpendicular to the one side surface from both secondary bushings, the relays from the secondary bushings to the low-voltage boards are relayed. Busbars and bus ducts are gone.

Further, both low-voltage boards are arranged back to back through a space at a position vertical to the one side surface from the primary bushing, and the space can be shared as a working space from the back surface of both low-voltage boards. .

The load is increased by arranging the low-voltage boards accommodating the circuit breakers in the vertical direction on one side of the existing low-voltage boards.

〔Example〕

Next, the present invention will be described in detail with reference to FIGS. 1 to 6 showing its embodiment.

First, FIG. 1 to FIG. 5 showing one embodiment will be described.

In these drawings, (21) is a distribution transformer, and three-phase coils (23) are arranged side by side in a horizontal direction on a channel base (22) fixed on the indoor floor surface and housed. An oil tank (24) is installed, and radiators (25) are attached to both front and rear surfaces of the oil tank (24).

(26) is the primary cable box provided on one side of the transformer (21), that is, on the left side of the tank (24), and (27) is the transformer (2
1) of three phases, which is pierced on the left side of 1) and connected to the primary side terminal
The next bushing is housed side by side in the box (26). A high voltage main circuit cable (30) is connected to the primary bushing (27) via a flexible conductor (28) and a connecting conductor (29) in the box (26), and the cable (30). Is supported by the cable bracket (31) and is drawn out from the drawing hole on the upper surface of the box (26). (3
2) is the inspection lid of the box (26).

(33) and (33) 'are two bushing boxes integrally provided at the upper left end of the front and rear surfaces of the transformer (21), respectively.
The left side surface of both boxes (33), (33) 'is flush with the left side surface of the tank (24). (34), (34) ′ are both boxes (33), (3
3) ′ are three-phase secondary bushings penetrating each left side surface and arranged in the lateral direction. Located on both sides of the primary bushing (27), the secondary side terminals of the transformer (21) are It branches inside the tank (21) and is connected to the secondary bushings (34), (34) 'in the boxes (33), (33)', respectively. (35) is a tap changer provided on the right side surface of the transformer (21).

(36) is a channel base provided on the left side of the transformer (21) and integrally connected to a channel base (22) of the transformer (21) by a connecting fitting (37), and (38), (38) ' Channel base
(36) is a low-voltage board installed vertically from both secondary bushings (34), (34) 'to the one side surface, that is, in a leftward position, and both low-voltage boards (38), (38) ) 'Is placed back to back by sandwiching the primary cable box (26), and the flanges on the left side of both secondary bushing boxes (33), (33)' are low-voltage plates (38), (38). Both sides of the secondary bushings (34) and (34) 'are bolted to the sides of the low pressure plate (3
It is introduced in 8) and (38) '.

In each of these two low voltage boards (38), (38) ', five circuit breakers (MCB) (39), (39)' are installed side by side in the board width direction (horizontal direction). Left and right low-voltage main circuit bus bar (40)
(40) 'is provided and connected to the secondary bushings (32), (32)' introduced into the board through flexible conductors (41), respectively, as shown in FIG. , Each MCB (39),
The power supply side terminal above (39) 'is connected to the busbars (40) and (40)' via branch conductors (42) and (42) '.

Reference numerals (43) and (43) 'denote load side connecting conductors connected to the load side terminals below the MCBs (39) and (39)' and supported by supports (44) and (44) ', respectively. The sinks (45), (45) 'are attached. (46), (46) 'are the connecting conductors (43), (43)'
Is a low-voltage main circuit cable connected to the low-voltage board (38), (38) 'supported by cable brackets (47), (47)'.
Is pulled out from the pull-out hole on the upper surface of.

(48) and (48) 'are protective plates provided at the front of each low-voltage board (38) and (38)', (49) and (49) 'are doors, and (50) and (50) ) 'Is a hook-type shield plate.

(51) is the channel base (35) between both low-voltage boards (38), (38) '
The floor board laid on the upper side, (52) is a rack installed in the left-right direction above the low-voltage boards (38), (38) ', and both low-voltage boards (3
The low voltage main circuit cables (46) and (46) 'drawn out from the upper surfaces of 8) and (38)' and the high voltage main circuit cable (30) drawn from the upper surface of the box (26) are respectively racks (52). It is guided along.

(53) and (53) 'are low-voltage boards for expansion. Two MCBs are installed side by side, and each MCB is connected to the low-voltage main circuit bus bar in the left-right direction in the upper part of the board as described above. Of the existing low-voltage boards (38), (38) 'are installed in rows on the left side of the existing low-voltage boards (38), (38)', respectively, and adjacent low-voltage boards (38) , (53) and (38) ', (53)' are connected to each other. MC of this low-voltage board (53), (53) '
The low voltage main circuit cable connected to the B load side terminal is pulled out from the upper surface of the panel and guided along the rack (52).

Therefore, according to the configuration of the embodiment, one of the transformer (21) is
Secondary and secondary bushings (27), (34) and tap changer (35)
Since it is located on each side and there is no need to provide a maintenance surface on the upper surface of the transformer (21), it is possible to install this kind of transformer (21) indoors where the height dimension of the installation space is restricted. MC connected to the transformer (21) and this secondary side
B (39), (39) 'low-voltage board (38), (38)' is installed integrally, realizing not only a reduction in installation space, but also a conventional bus bar and bus duct for relaying. Is unnecessary.

In addition, since the primary bushing (27) is arranged on one side of the transformer (21) and the secondary bushings (34), (34) 'are arranged on both sides thereof, no space is wasted and both secondary Since the bushings (34), (34) 'are connected to the inside of the tank (24) of the transformer (21), that is, to the secondary side terminals branched in oil, the branch points are maintenance-free. .

Furthermore, the low-voltage boards (38), (3) installed at the positions to the left of both secondary bushings (34), (34) 'of the transformer (21), respectively.
In 8) ', five MCBs (39), (39)' are arranged side by side in the width direction of the board, so the MCBs are arranged in two levels vertically and the low voltage main circuit cable is arranged in the depth direction of the board. It is possible to reduce the depth dimension of the board compared to the low pressure board of
The low-voltage boards (38), (38) 'with a surface configuration allow the space space between them to be shared as a cable terminal work space for both low-voltage boards (38), (38)', so there is no waste in the installation space and future No waste of additional space when expanding

Here, since the low-voltage boards (38) and (38) 'do not have a special structure associated with being integrated with the transformer (21), the standard product can be used as it is, which is economical.

Next, FIG. 6 showing another embodiment will be described.

In the figure, the point different from the above is the distribution transformer (21), in which the three-phase coils (23) are arranged side by side in the front-rear direction in the center of the left side surface of the tank (24). Next Bussing (27)
1 on the left side of the tank (24)
On both sides of the secondary bushing (27), secondary bushings (3) connected to the secondary side terminals branched inside the tank (24), respectively.
4) and (34) 'are provided.

In each of the above-mentioned embodiments, a low-voltage power distribution device having 10 circuits (feeders) of MCBs corresponding to the conventional example is shown, and each of the low-voltage boards (38) and (38) 'has five circuits. M
CB (39), (39) 'are stored, and low-voltage board (5
3) and (53) 'each show a case in which two circuits of MCBs are housed, but the invention is not limited to the above, and a low-voltage board housing the MCBs of an arbitrary number of circuits should be used. In particular, if a low-voltage board for expansion which accommodates one circuit of MCB is used, it is convenient since it is possible to finely cope with future expansion from a minimum of one circuit.

[Effect of device]

As described above, according to the low-voltage distribution device of the present invention, the height dimension of the transformer itself can be kept low by disposing the primary cable on one side of the transformer and the secondary cables on both sides thereof. In addition to this, it is possible to install the transformer and the low-voltage panel that houses the circuit breaker connected to the secondary side integrally, thus reducing the installation space.
The effect that the cost can be reduced can be obtained.

[Brief description of drawings]

1 to 6 show an embodiment of a low-voltage power distribution device of the present invention, FIGS. 1 to 5 show one embodiment, FIG. 1 is an overall perspective view, and FIG. 2 is a distribution transformer. Fig. 3, Fig. 3 is a cut left side view, Fig. 4 is a partial cutaway front view showing a connection state between the secondary bushing and a circuit breaker in the low voltage panel, and Fig. 5 is a single line system diagram. FIG. 6 is a plan view of another embodiment, FIG.
The following figures show a conventional example, FIG. 7 is an overall perspective view, FIG. 8 is a cut-away side view of a low-voltage board, and FIG. 9 is a single-line system diagram. (21) …… Distribution transformer, (27) …… Primary bushing, (3
4), (34) '... Secondary bushing, (38), (38)' ... Low voltage board, (39), (39) '... Wiring circuit breaker (MCB).

Claims (1)

[Scope of utility model registration request] 1. A primary bushing provided on one side surface of a distribution transformer and connected to a primary side terminal of the transformer, and a secondary side terminal of the transformer provided on both sides of the primary bushing, respectively. A secondary bushing branched and connected to each other, a low-voltage board installed at a position perpendicular to the one side surface from each of the secondary bushings, and a power supply side housed in each of the two low-voltage boards, and each of which has a secondary side. A low-voltage power distribution device comprising a circuit breaker connected to a bushing.