JPH0326742Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is a low-voltage power distribution system constructed by connecting a plurality of molded circuit breakers housed in a low-voltage panel to the secondary side of a power distribution transformer. Regarding equipment.

[Conventional technology]

Conventionally, this type of low-voltage power distribution device has been configured as shown in FIGS. 1 to 4 when eight molded circuit breakers are branch-connected to the secondary side of a distribution transformer.

In other words, the distribution transformer 1 and two low-voltage panels 2 installed side by side and each containing four molded circuit breakers are installed separately, and a bus duct 3 is connected between them.
a, 3b, and 3c, and the secondary side terminal 4 of the transformer 1 is connected to the bus bar 6a in the bus duct 3a by the flexible terminal 5, and the secondary side of the transformer 1 is connected to each bus duct 3a, 3b, and 3c. Each bus bar 6 in
It is drawn into the low pressure platen 2 via a, 6b, and 6c.

The inside of the low-voltage panel 2 is as shown in FIGS. 3 and 4, and the front panel 7 inside the panel has four molded circuit breakers 8, each with a power supply side terminal 8a and a load side terminal 8b. It is attached by leading it out to the rear,
Bus bar 6c with each power supply side terminal 8a drawn into the panel
Each load side terminal 8b is introduced into the panel from the bottom and is connected to a cable 11 supported by a cable bracket 10 via a branch conductor 12.
An instrument current transformer 13 is attached to each branch conductor 12 on the load side, and each cable 1
A zero-phase current transformer 14 is attached to 1.

Note that a branch busbar (not shown) of the busbar 6c is provided inside the low-voltage board 2 into which the busbar 6c is drawn, and this is introduced into another low-voltage board 2 in the parallel board and wired in the same manner as described above. ing.

[The problem that the idea aims to solve]

However, according to the conventional low-voltage power distribution device, the distribution transformer 1 and the low-voltage panel 2 are placed separately, so that the ducts 3a, 3b,
3c is required, and furthermore, the routing of the conductor inside the low voltage board 2 becomes complicated and the external dimensions of the low voltage board 2 become large, which has the disadvantage of increasing the total space. Due to the large number of conductor connection points, maintenance and
This has the disadvantage that inspection work becomes complicated and difficult.

In addition, when transporting this type of equipment, the assembled parts must be assembled into the transformer 1, both low voltage panels 2, each bus duct 3a,
It has to be disassembled into 3b and 3c, transported, and then reassembled on site, which has the disadvantage of being extremely time-consuming.

Furthermore, due to the aforementioned reasons, manufacturing costs, transportation costs,
Local installation costs will be relatively high in both cases, resulting in an increase in total cost.

This idea was made keeping in mind these problems of the conventional technology, and its purpose is to ultra-reduce the total space, simplify transportation and installation work, and reduce the total cost. Our objective is to provide a low-voltage power distribution device that makes it possible to

[Means to solve the problem]

In order to achieve the above object, the low-voltage power distribution device of this invention includes a distribution transformer with a secondary side terminal provided on the top surface and a mounting body fixed to the front surface, and a power distribution transformer that is supported by the mounting body via vibration isolating rubber. It is integrally attached to the exposed front surface of the transformer, and a bulge is formed on the back side to cover the secondary side terminals. A low-voltage panel is integrally attached to the panel, a plurality of molded circuit breakers are housed in the low-voltage panel, and a secondary terminal is branched from the secondary terminal in the low-voltage panel to connect the secondary terminal and each circuit breaker. Multiple insulated wires each directly connected to the power supply side terminal, multiple cables drawn from below into the low voltage panel and each directly connected to the load side terminal of each molded circuit breaker, and integrated only into the transformer. It is equipped with hanging hardware for lifting the transformer and low voltage panel installed at the same time.

[Effect]

In the case of the low-voltage power distribution equipment with the above-mentioned configuration, a low-voltage panel is integrally installed in front of the exposed distribution transformer,
Insulated wires branched from the transformer secondary terminals within the low-voltage panel are directly connected to the power supply terminals of multiple molded circuit breakers, eliminating the need for conventional bus ducts and making it easier to route conductors within the panel. This makes it possible to downsize the low-voltage plate itself and the entire device.

Furthermore, during transportation and installation, by using hanging hardware provided only for the transformer, the transformer and its integrated low-voltage panel can be transported and installed all at once without dismantling the device.

〔Example〕

Next, this invention will be described in the fifth section showing one embodiment of the invention.
This will be explained in detail with reference to the drawings below.

In these drawings, reference numeral 15 denotes a distribution transformer, and four foundation bolts 16 provided at the bottom are located at each vertex position of a square, that is, each mounting pitch in the width direction and depth direction is at a position with the same dimension L. The transformer 15 is arranged in such a way that the direction of the transformer 15 can be freely set. 17a,1
7b, 17c, and 17d are heat radiators attached to the left and right sides of the transformer 15, respectively. This is the secondary side terminal of the phase, and the conductor portion led out from the bushing is formed in a substantially U-shape.

Reference numeral 19 denotes two right-angled triangular mounting bodies that are fixed to the lower left and right sides of the front side of the transformer 15 with a space left below, respectively, and 20 is mounted on both mounting bodies 19 via anti-vibration rubber 21. By doing so, it is a low voltage plate that is integrated with the front side of the transformer 15 by forming a space downwardly, and the main body of the low voltage plate 20 has a bulging part that bulges rearward at the upper center part. has been
2 of the three phases of the transformer 15 from the lower opening of the bulge.
While the next terminal 18 is introduced into the panel main body,
The periphery of the opening connects to the transformer 15 via the vibration isolating rubber 23.
is integrally attached to. 24 is the low pressure plate 20
25 is a front door of the low-voltage panel 20, and 26 is integrally provided at four locations on the top surface of the transformer 15. 15 and the low voltage platen 20 at once. In addition,
The vibration isolating rubbers 21 and 23 are provided to prevent vibrations of the transformer 15 from being transmitted to the low voltage platen 20.

Reference numeral 27 denotes a molded case circuit breaker housed in the low voltage panel 20, and this type of power distribution device is provided with eight molded case circuit breakers 27, which are arranged in the left and right direction. 28 is an insulated wire that directly connects the secondary terminal 18 of the transformer 15 and the power supply terminal 27a of the circuit breaker 27, and the secondary terminal 18 of each phase is insulated as shown in FIG. The circuit is branched into eight circuits by electric wires 28, and each circuit is connected to each phase of each power supply side terminal 27a of eight molded circuit breakers 27. 29 is an instrument current transformer provided in the three-phase insulated wire 28 on the power supply side of each molded circuit breaker 27; 30 is drawn into the low voltage panel 20 from below and supported by a cable bracket 31; the tip is for wiring; This cable is directly connected to the load side terminal 27b of the circuit breaker 27, and is connected to each circuit breaker 2.
The load side of 7 is drawn out of the panel via each cable 30. 32 is a zero-phase current transformer provided in each cable 30 in the low voltage panel 20; 33 is the low voltage panel 2;
This is a trough laid in the left-right direction using the space 22 below the cable 30.

[Effect of idea]

Since this invention is configured as described above, it produces the effects described below.

A low-voltage panel containing multiple molded circuit breakers is integrally installed in front of the exposed distribution transformer, eliminating the need for a conventional bus duct and downsizing the entire device. The secondary terminals of the are housed inside the low-voltage panel and connected directly to the molded-in circuit breakers using insulated wires, and the cables are connected directly to each molded-case circuit breaker in the low-voltage panel, making it easy to route conductors within the panel. This makes it possible to reduce the size of the low-voltage plate, and the total space can be extremely reduced.

In addition, since the secondary terminal of the transformer and the molded circuit breaker are directly branched using insulated wires, and the cable is directly connected to the molded circuit breaker,
The amount of conductors and conductor connection points are drastically reduced, making maintenance and inspection work easier.

Furthermore, by integrating the low-voltage panel into the transformer, it is possible to transport and install this type of equipment all at once using hanging hardware installed only on the transformer, without disassembling the assembled product, making it possible to carry out all-in-one transportation and installation on-site. There is no need for reassembly, simplifying transportation and installation work.

As a result of the above-mentioned effects, manufacturing costs, transportation costs, and on-site installation costs are all reduced, making it possible to reduce the total cost.

[Brief explanation of the drawing]

Figures 1 to 4 show conventional low-voltage power distribution equipment, where Figure 1 is a single-line system diagram, Figure 2 is a general front view, Figure 3 is a side view of the low-voltage panel, and Figure 4 is Figure 3. The following drawings show one embodiment of the low-voltage power distribution device of this invention, and FIG. 5 is a single-line system diagram, and FIGS. 6, 7, and 8 are front views of the whole. FIG. 9 is a cutaway side view of the main part, and FIG. 10 is an enlarged perspective view of the secondary terminal. 15...Distribution transformer, 20...Low voltage panel, 27
...Made-in circuit breaker.

Claims (1)

[Claims for Utility Model Registration] A distribution transformer with secondary terminals provided on the top surface and a mounting body fixed to the front surface, and an exposed front surface of the transformer supported by the mounting body via anti-vibration rubber. A bulge portion is formed on the back side of the transformer to cover the secondary side terminal, and a peripheral edge of a lower end opening of the bulge portion is integrally attached to the upper surface of the transformer via a vibration isolating rubber. a low-voltage board; a plurality of molded circuit breakers housed in the low-voltage board; and a power supply branched from the secondary terminal in the low-voltage board for the secondary terminal and each of the molded circuit breakers. a plurality of insulated wires each directly connected to the side terminal, a plurality of cables drawn into the low voltage panel from below and each directly connected to the load side terminal of each of the molded case circuit breakers, and only the transformer. A low-voltage power distribution device comprising: a hanging hardware for lifting the transformer and the low-voltage board integrally together.