JPS58178939A - Fuse - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention This invention cuts off the fault current by blowing out the fuse element in response to the fault xi.
The present invention relates to fuses for protecting roads and equipment, and in particular to stabilizing the arrangement of fuse elements.

When a fault current flows through a fuse, the fuse element melts and generates an arc voltage in the opposite direction of the voltage to cut off the fault current. Determined by the shape of the fuse element and the arc extinguishing agent, if the length of the fuse element is short, the required arc voltage will not be obtained and it will not be possible to interrupt the arc, resulting in an explosion. On the other hand, if it is too long, a very high arc voltage will be generated and the insulation of circuits and equipment will be destroyed. Therefore,
There is a certain length depending on the rated voltage, and the length of the fuse element is set roughly in proportion to the rated voltage.

On the other hand, the external dimensions of the fuse must be large enough to accommodate the fuse element, and the cross-sectional area is usually set roughly proportional to the rated current, and the length is set roughly proportional to the rated voltage. However, due to the need to standardize the parts used and share the fuse holder, the outer diameter of the fuse may be standardized to be the same as that of a fuse with a higher rated voltage. For example,
7, 2 KV and 8. are currently widely used in Japan.
The outer diameter dimensions of fuses for 6Kv are often the same. In such a case, the external dimensions of the fuse should be 7.
Since it is too long for BKV, the fuse element and terminal metal are relayed by a conductive member.

An example of a conventional fuse structure in which the fuse element and the terminal metal as described above are relayed by a conductive member is shown in FIGS. 1 and 2.

In the figure, (1) is an insulating tube with a terminal metal (2) installed at both ends, and an opening (0 (2)
a), and a connecting portion (2b) in which a part of the terminal metal (2) is bent inward of the fuse is formed around this opening (2a). Fuse element (8)
The conductive member (4) is formed in a spiral or wave shape, and its end is connected to one end of a band-shaped conductive member (4).
) is connected to the connecting portion (2b) of the terminal metal (2). (6) is an arc extinguisher, and the opening (2) of the terminal metal (2)
Fill the opening (2a) with a rivet (6).
), I am having trouble installing jl(7).

As for its components, the insulating cylinder (1) is made of porcelain or resin tube, the terminal metal (2) and the conductive member (4) are made of copper, the fuse element (8) is made of silver, and the arc extinguisher f5 is used.
) is made of silica sand, and the lid (7) is made of copper or iron.

In conventional fuses with the structure described above, the thick or large-volume conductor *5a (4) is caused by vibrations when filling the arc extinguishing agent (5), vibrations and shocks during transport or operation of the fuse. If the ends of the fuse elements (8) are displaced or come into contact with each other or the insulating cylinder (1), the disconnection performance may deteriorate during operation, and in some cases, there is a risk that the disconnection will not be possible or frequent outbreaks will occur. be. In order to prevent this, a sufficient distance is provided between the fuse elements (8) and between the insulating cylinder (1), which has the drawback of increasing the external dimensions of the fuse.

This invention was made with attention to the above points, and provides a fuse that does not have the drawbacks of the conventional ones by providing a steady rest at the joint between the fuse element and the conductive member. be.

An embodiment of the present invention will be described below with reference to FIG. (
1) is an insulating cylinder, (2) is a terminal metal, and (8) is a fuse element, and one end (8a) of a wire-shaped or band-shaped conductive member (8) is connected to this fuse element (8).
is connected to the terminal metal (2) as before, but the other end (
8b) is connected and fixed to the relay terminal (9), and roughly extends from the relay terminal (9) in a radial direction with respect to the axis of the insulating tube (1) to reach the inner surface of the insulating tube. ) is provided. Then, the end of the fuse element (8) is connected to the relay terminal (9) or the conductive member (8)! iI
Continue. That is, the conductive member (8) is connected and fixed to the disc-shaped relay terminal (9) at a predetermined distance (8b) in front of the end thereof, and the steady rest part (80) has a radius relative to the axis of the insulating cylinder (1). It is bent approximately at right angles to the direction of the insulating cylinder (1) so that the tip reaches the inner surface of the insulating cylinder (1).

As for its constituent materials, the conductive member (8) may be made of wire or strip copper, and the relay terminal (9) may be made of copper if a fuse element (8) is connected to it. 8] to the conductive member (8), iron can be used.The rest of the structure is the same as the conventional one shown in FIGS. 1 and 2, so a description thereof will be omitted.

As is clear from the above, since the end of the fuse element (8) of the fuse of the present invention is fixed by the relay terminal (9), the distance between the fuse elements (81) is reliably maintained, and the relay terminal ( 9) extending in the radial direction with respect to the axis of the insulating tube (1).
Since it is equipped with a steady rest part (8C) that extends to the inner surface of the fuse element (8), the required distance between the fuse element (8) and the insulating tube (1) is reliably maintained, and arc extinguishing agent can be applied by kneading unlike conventional ones. Vibrations during filling, vibrations and shocks during transportation or operation of the fuse will not cause contact between fuse elements or the insulating tube, resulting in a decline in insulation performance, inability to shut off, or explosion during operation. Therefore, the distance between the fuse elements and the insulating cylinder can be reduced, and the outer dimensions of the fuse can be reduced.

FIG. 4 shows another embodiment of the present invention, showing the relay terminal and the main parts on the conductive part side.

In this example, the relay terminal (7) has a cylindrical shape, and a plurality of notches (10a) are provided from the end of the relay terminal (7) to bend locally in the radial direction with respect to the axis of the insulating tube. extends to the inner surface of the insulating cylinder to form a steady rest part (10b). The end portion of the conductive portion side αl) is connected and fixed to the relay terminal (to) in a straight state. Even in this case, the same effect as above can be achieved.

As described above, according to the present invention, the spacing between the fuse elements and the insulating cylinder is reliably maintained by the relay terminal and the steady rest part, so an excellent effect is obtained in that the external dimensions of the fuse can be reduced. can get.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing the structure of a conventional fuse, Fig. 2 is a cross-sectional view of the paddy shown in Fig. 1, Fig. 8 is a cross-sectional view showing an embodiment of the present invention, and Fig. 4 is a cross-sectional view of this FIG. 7 is a cross-sectional view showing the main parts of another embodiment of the invention. In the figure, (1) is the insulating tube, (2) is the terminal metal, (8) is the fuselage element), (81 and (1υ) are the conductive part side, (9
) and ←1 are relay terminals, (8C) and (10b) are 6-shake rest parts, and (10a) is a notch. In the drawings, the same reference numerals indicate the same or corresponding parts. Agent Shin Kuzuno −

Claims (2)

[Claims] (1) A terminal metal installed at both ends of the insulating cylinder, a wire or band-shaped conductive member having one end connected to the leaking metal and the other end connected to a relay terminal arranged inside the insulating sieve; Extending from the relay terminal in the radial direction with respect to the axis of the insulating cylinder,
A fuse comprising a steady rest extending to the inner surface of the insulating tube, and a fuse element having an end connected to the relay terminal or the conductive member. (2) Steady rest part that is connected to the relay terminal a predetermined distance before the inner end of the conductive member, is bent radially from the inner end with respect to the axis of the insulating cylinder, and has its tip reaching the inner surface of the insulating cylinder. A fuse according to claim 1 comprising: (A number of notches are provided at the end of the 87S-shaped relay terminal, and the leakage from these notches bends locally in the radial direction with respect to the axis of the insulating tube and reaches the inner surface of the insulating tube.) ``In the first claim of the patent, which constitutes a stopper part!
Hughes on.