JPH0739059A - Terminal structure for current-carrying drying of OF cable - Google Patents

Abstract

(57) [Summary] [Purpose] The terminal fittings for connecting lead conductors can be generalized,
To provide a terminal structure for current-carrying and drying of an OF cable, which does not require additional terminal treatment work on the conductor. A conductor compression sleeve (2) having a male screw (22) and a terminal metal fitting (3) wrapped and fastened to the male screw of the conductor compression sleeve are combined, and the terminal metal fitting is capable of being screwed into the male screw. It comprises a pair of half metal fittings 31 and 32 and a bolt 33 for tightening them, and a lead conductor connecting terminal 38 is provided on one of the half metal fittings. In the conductor compression sleeve, the outer diameter of the conductor compression sleeve body itself varies depending on the outer diameter of the conductor, but the male screw can be constant regardless of the outer diameter of the conductor. The present invention focuses on this point and adopts a method of fixing a terminal fitting to a male screw having a constant size. Therefore, a half metal fitting having a female screw that can be screwed into the male screw is used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a current-carrying / drying terminal structure useful for drying an insulating paper-wrapped insulating core of an OF cable by energizing a conductor.

[0002]

2. Description of the Related Art An insulating core formed by winding insulating paper on a conductor is subjected to a drying operation such as removing moisture contained in the insulating paper in a state of being housed in a basket in a drying tank,
Prepared for the sealed metal coating and oil immersion work in the subsequent process. As one means for performing such a drying operation, there is a method in which the conductor is energized and the insulating paper is dried by the heat generated at that time. Then,
As a conventional conductor energizing means, a terminal metal fitting dedicated to current energization is directly attached to a conductor terminal exposed by removing insulating paper, and a lead conductor is connected to this terminal metal fitting.

[0003]

The OF cable has a different conductor outer diameter each time the voltage class changes, and the above-mentioned means is a special terminal metal fitting finished to different dimensions each time the conductor outer diameter changes. Is required. However, since the terminal fitting dedicated to the electric current supply is used only for the drying work during the manufacturing of the OF cable and becomes a long piece unnecessary for the subsequent work, the use of the special terminal fitting as described above causes a high cost. There is a disadvantage. Further, if the terminal metal fitting is directly fixed to the conductor, it may damage the conductor, and it is necessary to perform additional terminal treatment on the conductor each time there is the damage.

The present invention solves the above-mentioned problems of the prior art, makes it possible to generalize the terminal fittings for connecting the lead conductors, and does not require any additional terminal treatment work for the conductors. Its purpose is to provide a terminal structure.

[0005]

One means for achieving the above object of the present invention is to combine a conductor compression sleeve having a male screw and a terminal fitting to be wrapped and fastened to the male screw of the conductor compression sleeve. The terminal fittings are
It is composed of a pair of half metal fittings having female threads that can be screwed onto the male thread and bolts for fastening them, and one of the half metal fittings is provided with a lead conductor connecting terminal.

In such a conductor compression sleeve, the conductor compression sleeve body itself has a different outer diameter depending on the conductor outer diameter, but the male screw can be made constant regardless of the conductor outer diameter. The present invention pays attention to that point and adopts a method of fixing a terminal fitting to a male screw having a constant size. Therefore, the present invention provides a half metal fitting having a female thread that can be screwed into a male thread, and is provided with a bolt for tightening the half metal fitting.

The conductor compression sleeve can be used for airtight connection of the hermetically sealed metal coating in the subsequent process, and the versatility is widened accordingly. Such conductor compression sleeves may be made from aluminum alloy to facilitate hermetic bonding of metallic coatings such as lead coatings. Further, the half metal fitting of the terminal metal fitting is preferably made of a metal having a thermal expansion coefficient smaller than that of the conductor compression sleeve, for example, copper or copper alloy. If the half-divided metal has a smaller coefficient of thermal expansion than the conductor compression sleeve, the heat generated when current is applied causes the conductor compression sleeve to undergo greater thermal expansion, resulting in a stronger screw connection with the half-divided metal. It can be something.

Another means for achieving the above object of the present invention is a combination of a conductor compression sleeve having a male screw and a terminal fitting that is fastened by covering the male thread of the conductor compression sleeve. Is a core type metal cylinder body with a slit that can be attached to the male screw, a pair of half metal fittings that can be externally fitted to the metal metal cylinder, and bolts that fasten these metal fittings. It is equipped with a terminal.

When the core type metal tubular body is made of a metal material softer than the conductor compression sleeve and the half-compartment metal, and the half-compartment metal is made of a metal having a thermal expansion coefficient smaller than that of the conductor compression sleeve. It is possible to suppress an increase in contact resistance of the.

[0010]

1 shows a preferred embodiment of a terminal structure for current-carrying and drying of an OF cable according to the present invention in a state of being attached to a conductor terminal, and FIG. 2 is an exploded explanatory view of a terminal metal fitting in the same embodiment. Is. In the reference numeral, 1 is a conductor end exposed by an OF cable, 2 is a conductor compression sleeve, and 3 is a terminal fitting.

The conductor compression sleeve 2 is made of aluminum or aluminum alloy, and the male screw 22 is projected from one end of the compression sleeve body 21. One of the terminal fittings 3 is made of copper or a copper alloy, and as shown in FIG.
A pair of half-brackets 31, 32 and a bolt 33 for fastening them are provided. Both half halves 31,
Female screws 34 and 35 are engraved on the inner surface of 32. One half metal fitting 31 has a stepped through hole 36 for passing the bolt 33, and the other half metal fitting 32.
A screw hole 37 is drilled in this. Further, a lead conductor connecting terminal 38 is formed on the other half metal fitting 32 so as to project therefrom. The head of the bolt 33 has a hexagonal hole so that the bolt 33 can be accommodated in the stepped through hole 36. This is to prevent the formation of sharp protrusions that may damage the cable when the current tank is subjected to current-current drying in a drying tank to be described later.

According to the current-carrying / drying terminal structure of the present embodiment in which the respective parts are configured as described above, the compression sleeve body 21 of the conductor compression sleeve 2 is mounted on the outer periphery of the conductor terminal 1 and compression-fastened. On the other hand, the terminal metal fitting half 3
1 and 32 are attached to the male screw 22 of the conductor compression sleeve, both female screws 34 and 35 are set so as to be screwed into the male screw 22, and the bolt 33 is inserted into the through hole 3 of the one half fitting 31.
6 and then screwed into the screw hole 37 of the other half metal fitting 32 to tighten the pair of half metal fittings 31 and 32, thereby attaching the terminal structure as shown in FIG.

FIG. 4 shows a state in which the insulating paper-wrapped insulating core 4 of the OF cable provided with the current-carrying drying terminal structure as described above is housed in the basket 6 in the drying tank 5, and is shown in FIG. The lead wire 7 is screwed to the lead conductor connecting terminal of the terminal fitting 3 (see 38 in FIGS. 1 and 2) and the lead conductor connecting terminal of the terminal fitting 3 ′ at the upper opening side terminal, and the lead wire 7 is fixed. Airtightly penetrate the tank and pour it into the external DC power source 8,
As a result, an electric current is passed through the conductor of the insulating core 4, and the Joule heat generated by the resistance of the conductor at that time causes heat to be generated. When the heat generation temperature at that time is set to 125 ° C. or higher, which is higher than the evaporation temperature of water, and this is continued for a certain period of time, the insulating paper is dried. When the temperature is raised to a predetermined temperature by energization as described above, the terminal structure portion is also exposed to a high temperature without exception, and each portion thermally expands, but the male screw 22 of the conductor compression sleeve 2 relatively thermally expands. Terminal fittings 3 made of metal with a small coefficient
The contact pressure of the half metal fittings 31, 32 to the inner surface of the female screw 34, 35 is strengthened, and the contact resistance between the parts is kept small, so that stable current conduction can be performed.

The insulating core of the OF cable, which has been dried by the above-described current application, is transferred to the sealing metal coating process such as lead coating, in which the terminal fitting 3 is removed but the conductor compression sleeve 2 is removed. Without this, it can be used as a part for hermetically joining such a hermetically sealed metal coating.

FIG. 3 shows another embodiment of the current-carrying / drying terminal device for an OF cable according to the present invention in a state where it is attached to a conductor terminal. The same or similar parts as in FIGS. 1 and 2 are referred to by the reference numerals.

In the present embodiment, the terminal fitting 30 is modified from the above-described embodiment into a screwless type. That is, the terminal fitting 30 is made of a soft metal material such as soft copper or soft aluminum and has a cylindrical shape that can be attached to the male screw 22 and has the slit 3
01a having a core type metal tubular body 301, screwless half metal fittings 302 and 303 manufactured by electrolytic copper or copper alloy so as to be externally fit to the core type metal metal body 301, and these half metal fittings 302 304 for tightening 303
It is composed of and. The second conductor compression sleeve is made of an aluminum alloy as in the above-mentioned embodiment. Further, in the reference numeral, 305 is a bolt through hole, 306 is a screw hole, and 307 is a lead conductor connecting terminal. According to the terminal structure of this embodiment, the core-type metal cylinder 301 is attached to the male screw 22 of the conductor compression sleeve 2, and half-brackets 302 and 303 are externally fitted to the outer side of the male-thread 22 and tightened with bolts 304. As a result, the core-type metal cylinder 301 made of soft metal is fastened while being compressed and deformed. The slit 301a absorbs the metal extension during such compressive deformation.

[0017]

According to the current-carrying and drying terminal structure by the two means of the present invention as described above, the terminal fitting is attached to the male screw whose outer diameter can be made constant by the conductor compression sleeve. By preparing only one type of terminal fitting, it can be used as a conductor compression sleeve that is compressed and fixed to different conductor sizes, and the terminal fitting can be generalized, contributing to cost reduction. Further, it is possible to fix an optimum conductor compression sleeve to the conductor end, and it is possible to eliminate the maintenance work for conductor damage that may be necessary by attaching the current-carrying and drying end fitting. Again,
The terminal metal fittings are attached directly from the outside of the male screw by means of female threaded half metal fittings or half metal fittings with a core type metal cylinder, so that the number of parts does not increase too much The terminal structure can be configured. And so on.

[Brief description of drawings]

FIG. 1 shows an embodiment of a terminal structure for current-carrying and drying of an OF cable according to the present invention in a state where the terminal structure is attached to a conductor terminal, (a) is a plan view, and (b) is a side view.

FIG. 2 shows a terminal fitting in the above embodiment, (a) is a side view, and (b) is a sectional view taken along line XX of (a).

FIG. 3 is a partially sectional front view showing another embodiment of the current-carrying / drying terminal structure of the OF cable according to the present invention in a state where the terminal structure is attached to the conductor terminal.

FIG. 4 is a schematic explanatory view showing a use situation of the terminal structure for current-carrying drying of the present invention.

[Explanation of symbols]

 1,1 'Conductor end 2,2' Conductor compression sleeve 3,3 ', 30 Terminal fitting 4 OF cable insulating core 5 Drying tank 6 Basket 7 Lead wire 8 DC power supply 21 Compression sleeve body 22 Male screw 31, 32, 302, 303 Half metal fitting 33,304 Bolt 34,35 Female thread 36,305 Through hole 37,306 Screw hole 38,307 Lead conductor connecting terminal 301 Core type metal cylinder 301a Slit

Claims (6)

[Claims] 1. A combination of a conductor compression sleeve having a male screw and a terminal fitting that is fastened by being wrapped over the male screw of the conductor compression sleeve. The terminal fitting has a pair of female threads that can be screwed into the male screw. A terminal structure for current-carrying and drying of an OF cable, comprising a half conductor and a bolt for tightening these, and one of the half conductors is provided with a lead conductor connecting terminal. 2. The terminal structure for current-carrying and drying of an OF cable according to claim 1, wherein the half metal fitting of the terminal fitting is made of a metal having a thermal expansion coefficient smaller than that of the conductor compression sleeve. 3. The terminal structure for current-carrying and drying of an OF cable according to claim 1, wherein the conductor compression sleeve is used for hermetically sealing a metal coating in a subsequent step. 4. A combination of a conductor compression sleeve having a male screw and a terminal fitting which is fastened to the male screw of the conductor compression sleeve by covering the male thread of the conductor compression sleeve. An OF cable characterized by comprising a metal tubular body, a pair of half-divided metal fittings that can be externally fitted to the metal tubular body, and bolts for fastening them, and a lead conductor connecting terminal being provided on one of the half-divided metal fittings. Terminal structure for current-current drying. 5. The core type metal tubular body is made of a metal material softer than the conductor compression sleeve and the half metal fitting, and the half metal fitting is made of a metal having a thermal expansion coefficient smaller than that of the conductor compression sleeve. A terminal structure for current-carrying drying of the described OF cable. 6. The terminal structure for current-carrying and drying of an OF cable according to claim 4, wherein the conductor compression sleeve is for airtight connection with metal coating in a later step.