JPH05299006A - Through-wall fuse and closed distribution panel - Google Patents

Abstract

PURPOSE:To surely prevent electric trouble of a fuse on the load side. CONSTITUTION:A through-wall fuse 15 in which a fuse 1 is housed has an insulation cylinder 17 mounted via a flange 16 through a metal plate 22, a terminal plate 19 connected to an outside circuit through the insulation cylinder 17 from an electrode 18 in contact with one base 3 of the fuse 1 and a terminal plate 21 put in contact with the other base 3 of the fuse 1 and connected to the outside circuit through the insulation cylinder 17 from the electrode 18 via a spring 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wall-mounted fuse in which a fuse body is wrapped with an insulating material and which can be mounted through a wall surface or a plate surface, and a closed switchboard provided with the wall-mounted fuse.

[0002]

2. Description of the Related Art FIG. 4 shows the appearance of a conventional fuse. The fuse 1 is composed of an insulating cylinder 2 for accommodating a fuse element and an arc extinguishing agent, and a cap portion 3 for drawing out the lead of the fuse element and filling the arc extinguishing agent.

Usually, the above-mentioned fuse 1 is inserted into an exposed type fuse clip or a sealed type fuse clip and connected to an external circuit for low voltage use. Further, when connecting to a high voltage circuit, as shown in FIG. 5, the base portion 3 is inserted and supported in the fuse clip 5 insulated by the support insulator 4 and connected via the external connection terminal 6. The purpose of installing the fuse is to reliably remove the influence of the fuse on the upstream power source side by instantaneously interrupting the accident on the downstream load side of the fuse.

FIG. 6 shows an example of a power supply system in a closed switchboard that is used in a conventional power plant or the like in which the above-mentioned fuse is installed.

In the figure, in the secondary circuit of the power receiving transformer 7, a bus duct or a cable 8 is connected to a closed switchboard 9, and a branch circuit breaker 11 supplies power to a load via a power receiving circuit breaker 10. The branch connection conductor 12 is connected to the instrument transformer 13 via the fuse 1 in order to measure the received voltage.

Each of the above-mentioned devices is housed inside the closed switchboard 9, and in the present example, the switchboard 9 is composed of four panels. In particular, the branch connecting conductor 12 of the instrument transformer 13 is a two-dot chain line. It is shown that the housing penetrates the portion indicated by and the side plate 9a.

FIG. 7 shows a simplified diagram of the inside of the closed switchboard 9 in which the instrument transformer 13 is housed. In this case, the fuse 1 has a shape attached to the instrument transformer 13, and since the branch connection conductor 12 penetrates the casing of the closed switchboard 9, it is supported and insulated by the insulating plate 14. We are trying to maintain The size of the connecting conductor is usually smaller than that of the main circuit conductor, and the current capacity is also small.

As described above, the closed switchboard 9 limits the accidents and disasters that occur inside the housing by housing the housing equipment in the housing, or transforms the overcurrent such as the overload generated in the external circuit into the instrument transformer. The fuse 1 installed in the container 13 is used to remove the cutoff, thereby suppressing the influence on the adjacent board and the external circuit as much as possible.

[0009]

However, the above fuse and the closed switchboard using the fuse have the following problems.

First, in the case where an electrically conductive gas is ejected or ionization occurs around the installation of the fuse 1 before it is electrically cut off due to an accident on the downstream side of the fuse 1 that should be completely removed. Due to the structure of the fuse 1 itself, there is a possibility that an arc or the like may be generated at the power source side terminal portion because the voltage application exposed portion exists on both the power source side and the load side.

If, in the closed switchboard 9, the area around the exposed portion of the electricity is ionized or made conductive due to a fire or a jet of a conductive gas, the insulation performance is maintained for both the exposed portion of the electricity and the ground. It becomes difficult to
There is a possibility of causing a short circuit or a ground fault in the connecting conductor portion upstream of the. Such an accident cannot be removed by the fuse 1 installed in the instrument transformer 13, leading to melting damage of the branch connection conductor 12 and, in addition, an arc short circuit in the upstream bus bar. There is a possible problem.

Therefore, an object of the present invention is to provide a highly reliable fuse capable of removing an electric accident occurring in a closed switchboard without being affected by the surrounding atmosphere and a closed switchboard using the fuse.

[0013]

According to a first aspect of the present invention, there is provided a fuse main body, an insulating body which houses the fuse main body and is formed so as to be penetrably attached to a wall plate surface, and both electrodes of the fuse main body. An external connection portion that penetrates the insulating object and connects to an external circuit is provided.

According to a second aspect of the present invention, the fuse main body and the fuse main body are housed in the penetrating portion of the wall surface through which the connection body between the power source side and the load side penetrates in the closed switchboard, and the fuse body can be mounted by penetrating the wall surface. A wall-penetrating fuse provided with an insulating object formed on the fuse body and an external connection part that penetrates the insulating object from both electrodes of the fuse body and connects to an external circuit, and connects the external connection part to the connection body. It was done.

[0015]

According to the first aspect of the present invention, since the wall penetration fuse can be mounted through the wall plate surface, the states of the partition side of the fuse on the power supply side and the load side do not affect each other, so that the fuse can be securely connected. The electric accident on the load side can be excluded.

According to the second aspect of the present invention, since the wall penetration fuse is installed in the connection conductor penetrating portion of the closed switchboard, and the connection conductor is attached through this, an electrical accident due to an abnormality in the connection conductor and the downstream side thereof is prevented. The electric accident can be surely cut off and excluded without affecting the row board side.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional view of a wall-through fuse mounted through a wall surface according to a first embodiment of the present invention. In the wall-through fuse 15, the fuse 1 is housed in an insulating cylinder 17 having a flange 16, one end of the fuse 1 is in contact with the electrode 18 and connected to the terminal plate 19, and the other end of the fuse 1 is for ensuring contact. It is configured to contact the electrode 18 via the spring 20 and be connected to the terminal plate 21. The wall penetration fuse 15 penetrates the through hole 22 a of the metal plate 22 and is fixed to the metal plate 22 by the flange 16.

As described above, in the first embodiment, the fuse 1 is housed as the wall-through bushing structure. As is apparent from this, when the load side is directed toward the terminal plate 21, the influence on the power supply side can be blocked by the metal plate 22 due to the conductive gas or the like generated due to the accident on the load side.

In FIG. 1, the insulating cylinder 17 is provided with the screw-in coupling portion 23 for replacement of the fuse 1. However, the present invention is not limited to this. It may be replaced.
Further, in FIG. 1, the mounting method using the flange 16 is adopted as the wall-through bushing mounting structure, but the mounting method is not limited to this, and the present invention can be similarly implemented by a fitting method.

FIG. 2 is a power supply system diagram of a closed switchboard 9 showing a second embodiment of the present invention. The difference from FIG. 6 is that a fuse is provided as a wall-through fuse 15 on the housing of the closed switchboard 9. It is a point.

FIG. 3 shows a simplified internal view of the closed switchboard 9 of FIG. The wall-side fuse 15 having the configuration shown in FIG. 1 is installed on the housing side plate 9a of the closed switchboard 9.
Thereby, the electric accident from the inner wall penetration fuse 15 of the closed switchboard 9 to the branch connection conductor 12 side and thereafter surely does not adversely affect the external circuit, and the wall penetration fuse operates to avoid the accident. The basic structure of the closed switchboard is described in the standards and the like, and is omitted here.

[0023]

As described above, according to the invention of claim 1, since the fuse is housed in the insulator and has the wall penetration structure, mutual influences of the fuse on the power supply side and the load side are avoided, and The electric accident on the load side can be reliably eliminated. Moreover, according to the invention of claim 2, since the wall-penetrating fuse is installed in the connecting conductor penetrating portion from the row panel of the casing of the closed switchboard, the influence on the power supply side due to the abnormality of the load-side of the wall-penetrating fuse. Is reliably removed, and an abnormal atmosphere does not propagate to the row board side, resulting in a highly reliable closed switchboard.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a wall-penetrating fuse installed through a wall surface showing a first embodiment of the present invention.

FIG. 2 is a power supply system diagram of a closed switchboard showing a second embodiment of the present invention.

FIG. 3 is an explanatory diagram showing the inside of the closed switchboard shown in FIG. 2;

FIG. 4 is an external view of a fuse showing a conventional example.

FIG. 5 is a fuse support structure diagram showing a conventional example.

FIG. 6 is a power supply system diagram corresponding to FIG. 2 of a closed switchboard showing a conventional example.

FIG. 7 is an explanatory view showing the inside of a conventional closed switchboard corresponding to FIG.

[Explanation of symbols]

 1 Fuse 15 Wall penetration fuse 16 Flange 17 Insulation cylinder 18 Electrode 19 Terminal plate 20 Spring 21 Terminal plate 22 Metal plate

Claims (2)

[Claims] 1. A fuse main body, an insulating body that houses the fuse main body and is formed through a wall so as to be freely mounted, and an external body that penetrates the insulating body from both electrodes of the fuse main body and is connected to an external circuit. A wall-penetrating fuse characterized by having a connecting portion. 2. A fuse main body and an insulating object formed to accommodate the fuse main body in a penetrating portion of a wall surface through which a connection body between a power source side and a load side penetrates in a closed switchboard and to be freely mounted through the wall surface. And a wall-penetrating fuse having an external connection part that penetrates the insulating object from both electrodes of the fuse body and connects to an external circuit, and connects the external connection part to the connection body. Closed switchboard.