JP2001103619A - Switchboard - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the assembly man-hours which are large, if minimum units of the components of a switchboard are assembled successively. SOLUTION: Conductors 36 and 42 are embedded in bushings 35 and 40 respectively. A current transformer 17 and a zero-phase current transformer 21 are attached, so as to surround the bushings 35 and 40. The bushings 35 and 42 and the current transformers 17 and 21 are unified to form a sensor unit 31 which is easy to handle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switchboard, in which components are integrated to reduce the number of assembly steps.

[0002]

2. Description of the Related Art A switchboard having a rated voltage of 7.2 kv class is configured as shown in FIG. In the figure, 1
Is a housing, and 2, 3, 4, and 5 are partition plates for separating circuit breaker rooms 6, 7 and a power bus room 8 and a load bus room 9, 10R, 10S,
10T is a main bus that is long in a direction perpendicular to the plane of the paper, 11 and 12 are power buses, 13 is a draw-out circuit breaker having a circuit breaker 14, 1
5 and 16 are load buses, and 17 and 18 are load buses 15 and 16
Current transformers provided in the
2 is a zero-phase current transformer, 23 is a protective cover, 24 is a control external terminal block, 25 is a front door, and 26 is a rear door.

[0003] In other words, as shown in FIG. 4, power supply buses 11 and 12 branching from main buses 10R, 10S and 10T are provided as shown in FIG.
And the current transformers 17, 18 and the zero-phase current transformers 21, 22, respectively. When assembling the switchboard, a procedure is adopted in which the circuit breaker 14, the current transformers 17, 18 and the zero-phase current transformers 21, 22 are sequentially attached to the housing 1. This is because the work must be performed in the smallest unit that can be carried due to the size and mass of each part.

[0004]

However, since each part is attached one by one, it takes a lot of time to assemble the switchboard, and there is a limit in reducing the number of steps.

[0005] Therefore, an object of the present invention is to provide a switchboard which solves such a problem.

[0006]

According to a first aspect of the present invention, there is provided a switchboard having a current transformer and a zero-phase current transformer provided in a conductor. And the current transformer and the zero-phase current transformer are provided so as to surround the bushing.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a switchboard according to the present invention will be described below.

FIG. 1 shows the configuration of a switchboard according to the present invention.
As can be seen from a comparison with FIG. 3, the partition plates 2, 3, 4, 5
However, the power supply bus room 8 and the load bus room 9 are long in the vertical direction.

[0009] The sensor units 31 and 32 are connected to the circuit breaker 14 via no load bus, and a load (not shown) is connected to the sensor units 31 and 32 via cables 19 and 20. Sensor units 31, 32
Have the same configuration, only the configuration of the sensor unit 31 will be described with reference to FIG.

As shown in the figure, a mounting plate 33 shown in FIG. 2 (c) is mounted on the partition plate 5 via bolts 34. The mounting plate 34 has three-phase through holes 33a and a pair of handles 33b.
Are provided. A bushing 3 having a flange 35a is provided in the through hole 33a and the through hole (not shown) of the partition plate 5.
5 is inserted, and the stud bolt 3
The flange portion 35a is connected to the partition plate 5 via the nut 3d and the nut 3d. A conductor 36 is provided in the bushing 35.
Is embedded, and a cable 19 is connected to the right end of the conductor 36, while a fitting hole (not shown) is formed at the left end.

A zero-phase current transformer 21 and a current transformer 17 are mounted on the bushing 35 side by side. Both are connected to the bushing 35 via a connecting means. That is, it is as follows. A pair of holding plates 3 each having a rectangular shape and a hole formed in a portion corresponding to the bushing 35 for three phases.
7 is inserted into the bushing 35 for three phases, and the zero-phase current transformer 2
1 and the current transformer 17. Further, three connecting lots 38 for connecting the pair of holding plates 37 and one connecting lot 39 for connecting the one holding plate 37 and the mounting plate 33 are provided on both sides.

On the other hand, a bushing 40 for connecting the circuit breaker 14 is attached to the partition plate 2 via a bolt 41, and a conductor 42 is embedded in the bushing 40. As shown in FIG. 2B, the right end of the conductor 42 is fitted into the fitting hole formed at the left end of the conductor 36.

In FIG. 1, reference numeral 30 denotes a relay.

Next, the operation of the switchboard will be described. Since the current transformers 17 and 18 and the zero-phase current transformers 21 and 22 are integrated into sensor units 31 and 32 in advance,
On the load side of the bushing 40, the sensor unit 31,
32 and only the cables 19 and 20 are connected.
Therefore, the work of assembling the switchboard is completed in a short time.

[0015]

As can be seen from the above description, claim 1
According to the switchboard according to (1), the current transformer and the zero-phase current transformer are attached to the bushing and integrated, so that labor for assembling the switchboard can be reduced.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a switchboard according to an embodiment of the present invention.

FIGS. 2A and 2B relate to a main part of an embodiment of a switchboard according to the present invention, wherein FIG. 2A is a configuration diagram, FIG. 2B is an exploded view, and FIG.

FIG. 3 is a configuration diagram of a conventional switchboard.

FIG. 4 is an explanatory view showing a procedure for assembling a conventional switchboard.

[Description of Signs] 17, 18 current transformers 20, 21 ... zero-phase current transformers 31, 32 ... sensor units 35, 40 ... bushings 36, 42 ... conductors

Claims (1)

[Claims] 1. A distribution board having a current transformer and a zero-phase current transformer provided on a conductor, wherein the conductor is embedded in a bushing, and the current transformer and the zero-phase current transformer are surrounded by the bushing. A switchboard characterized by having provided.