JPS5835001B2 - Spot network power receiving device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a spot network power receiving device in which a high voltage side conductor connecting the primary side of a transformer and a switch is arranged in a switchboard.

In the spot network power reception method, power is received from the power supply substation of the electric power company through multiple distribution lines, a disconnect switch is installed on the primary side of the transformer, and a network protector is placed on the secondary side for each transformer to protect the load. are connected in parallel on a network bus, and power is supplied to each customer's load through several main lines connected to the bus.

The spot network power receiving system is shown in FIG. 1 and will be explained. A cable head 2 and a power receiving load switch 3 are connected to a transformer 4 as special high voltage equipment (22 kV for example) from a power supply substation 1 through one supply line. The conductor connected to the primary side 5A and connecting these is generally referred to as the high voltage side.

In addition, as a low voltage equipment (240 to 415V as an example), protect the secondary side 5B of the transformer 4 from the protective fuse 6, protector breaker T1 network bus 8, tick-off device 9, etc., and connect the conductor connecting these to the low voltage side. It is called.

When these are configured as a closed distribution board, as shown in FIG. 2, a special high voltage closed distribution board 10 and a low voltage closed distribution station 11
There are two types: a so-called separate type, which separates the power lines and connects them with a bus box 12, and a so-called integrated type, which integrates the special high voltage and low voltage chain distribution boards shown in FIG.

In the case of the separate type, a large amount of equipment area is required to provide a busbar box, so recently there has been a shift to the integrated type.

However, even with this integrated type, there is a demand for the switchboard to be downsized.

An object of the present invention is to provide a spot network power receiving device in which the width dimension of a power distribution box is reduced.

In the spot network power receiving device of the present invention, 1. If the primary side terminal of the transformer and the outgoing terminal of the switch are arranged so as not to correspond to each other, the high voltage side conductor connecting between the negative side terminal and the outgoing terminal is Since it can be arranged diagonally, the distance between the negative side terminal and the lead-out terminal can be reduced, so that the width dimension of the distribution box can be reduced.

Embodiments of the present invention will be described below using spot network power receiving devices shown in FIGS. 3 to 6.

The distribution box 10 has an inspection passage 12 and an auxiliary passage 13 orthogonal to the inspection passage 12 on a partition wall plate 11 provided at the center thereof, thereby forming four chambers 14A to 14D.

A door 18 that can be opened and closed is attached to one side of each of these rooms.

In one room 14A, the installed transformer 20 and the load switch 21 in the other room 14B are placed in correspondence with each other, and in the other room, the cable head 22 and the network busbar 23 are placed. There is.

Upper and lower rooms 14C adjacent to the other room 14B
, 14D includes a protector breaker 24 and a control device 2.
5 is placed.

The cable head 22 may be drawn in from below or from above as indicated by a chain line, and either one may be used.

This example uses the latter.

In order to connect electrical equipment arranged in each of these rooms, the primary side terminal 26 of the transformer 20 and the lead-out terminal 21A of the load switch 21 are connected to a bushing 27 fixed to the bulkhead plate 11. The high voltage side conductor 28 is connected to the high voltage side conductor 28 .

That is, the high voltage side conductor 28 is arranged so as to correspond to the ceiling surface 15 of the switchboard, and the high voltage side conductor 28 and the connection parts 29 such as the primary side terminal 26 and the bushing 27 are all arranged to correspond to the ceiling surface 15 or the inspection passage 12. arranged to correspond.

A part of the ceiling surface 15 is provided with a lid 16 that can be opened and closed freely.
When the lid 16 is opened, the high voltage side conductor 28, the connecting portion 29, and the network bus bar 23 are exposed.

At this time, as shown in FIG. 6, the three-phase bushings 27 are arranged so that the bushings and at least two phases of the primary terminal 26 and the lead-out terminal 21A do not coincide with each other.
7 and the lead-out terminal 21A are shifted to one side of the distribution box 12 and arranged.

The high-voltage side conductor 28 is connected at an angle between the bushing 27 and the primary side terminal 26 and between the bushing 27 and the lead-out terminal 21A.

30 is an exhaust tact provided on the ceiling surface 15.

The low voltage side conductor 32 connected to the secondary side terminal 31 of the transformer 20 passes under the inspection passage 12 and passes through the adjacent protector fuse 33, current transformer 34 and protector breaker 24 as shown in FIG. via network bus 28
It is connected to the.

Since these are arranged in correspondence with the inspection passage 12 and the auxiliary passage 13, operations such as maintenance, inspection, and installation are easy.

For example, since the protector fuse 33 is arranged corresponding to the inspection passage 11, the cover 12A provided in the inspection passage
By removing the fuse, you can easily replace and install the fuse.

Further, in FIG. 6, the transformer 20 is generally large in size, and the basis for determining the maximum size of the switchboard is often influenced by the transformer.

Therefore, the terminals 26 of the transformer are distributed based on the center of the board.

However, switch 27. In order to arrange the cable head 22 and the like as compactly as possible, it is better to place them close together as shown in FIG. 6 (downward in the figure).

Here, the bushing 27 is, for example, the primary terminal 2 of the transformer.
6, the distance from the pull-out terminal 21A of the switch becomes long and the mechanical strength becomes weak.

Furthermore, since the insulation distance between each phase becomes smaller, the W dimension becomes larger when trying to maintain the required insulation distance.

Therefore, the bushing 27 is connected to the primary terminal 26 and the lead-out terminal 21.
It is best to stagger them so that they do not coincide with A.

In this spot network power receiving device, - next terminal 2
6, the bushing 2T, and the lead-out terminal 21A so that they do not match, the high-voltage side conductor 28 (metallic conductor 28) placed between them is arranged diagonally, so that the connection between the negative side terminal 26 and the lead-out terminal 21A is Since the distance between the terminals 26 and 2 is not wide, not only can the width W of the distribution box 10 be made narrower, but also the distance between the negative side terminal 26 and the lead-out terminal 2
1A and the bushing 27 are staggered so that they do not match, so the bushing 27
Installation and removal work can be done without being disturbed by objects such as A.

[Brief explanation of drawings]

Fig. 1 is a power system diagram of a commonly used spot network power receiving device, Fig. 2 is a perspective view of a conventional spot network power receiving device, and Fig. 3 is a perspective view of a spot network power receiving device shown as an embodiment of the present invention. Figure, 4A
5 is a sectional view taken along lines X-X and Y-Y in FIG. 3, FIG. 4B is a front view of FIG. 4A when viewed from the right side, and FIG. 6 is a plan view of the main part of FIG. 4A. It is. 10... Distribution box, 11... Bulkhead plate, 2
0...Transformer, 21...Load switch,
21A...Output terminal, 26...-Next terminal, 27...Bushing, 28...
High voltage side conductor.

Claims (1)

[Claims] 1 A transformer having a primary side terminal and a secondary side terminal and a switch having a lead-out terminal are arranged correspondingly through a partition wall provided in the distribution box, and both ends of the three-phase bushing provided in the partition wall and the primary side terminal In the case where the high-voltage side conductor connects the 3-phase bushing and the outgoing terminal, power is distributed between the 3-phase bushing and the outgoing terminal so that the 3-phase bushing and at least two phases of the primary side terminal and the outgoing terminal do not coincide with each other. box 1
A spot network power receiving device characterized by being placed offset to the side.