JPH06189437A - Cable terminal structure for plug-in connection to apparatus for distribution - Google Patents

Abstract

PURPOSE:To provide a cable terminal plugged in an apparatus for distribution with high reliability even if the cable has a large size. CONSTITUTION:A cable terminal structure comprises a sleeve part 33 compressedly connected to a conductor 20 in a terminal of a cable for distribution, a terminal conductor 30 having a contact head part 34 plugged in to be connected to a contact of a bushing through an insertion in the bushing of the apparatus side and a flange stopper 32 extending outward at the portion where these sleeve part 33 and contact head part 34 are connected, and a fixing ring 40 which is slidably installed on a sleeve part of this terminal conductor 30 and is screwed into the bushing in a condition the ring is pressed to the flange stopper 32. The terminal conductor 30 is used as a body through the contact head part 34 and the sleeve part 33, and flange stopper 32 is separated, and the flange stopper 32 is removably screwed and fixed to the body, and thus the fixing ring 40 can be mounted after the sleeve part 33 is compressedly connected and an insulating tape is wound.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for connecting a terminal of a power cable to a power distribution device, and more particularly to a cable terminal structure for inserting and connecting to a bushing provided in the power distribution device.

[0002]

2. Description of the Related Art In power distribution systems, cables are being underground and power distribution equipment is being made compact, and various demands have been made for the terminal structure of cables to be inserted and connected to the power distribution equipment. In general, a cable that passes through the ground is terminated from a distribution equipment, such as a high-voltage cabinet, which is raised from a pit and installed on the ground. Since the connection is a plug-in connection method with respect to the bushing on the device side, the cable terminal is provided with a terminal conductor for insertion.

FIG. 7 shows an outline of a cable terminal portion to be inserted into and connected to a power distribution device which is a high-voltage cabinet, and FIG. 8 specifically shows its structure. As can be understood from these figures, in the end portion of the cable 1, the sheath, the shielding layer, and the insulator are sequentially stripped to expose the conductor (see 2 in FIG. 8). Reference numeral 3 is a terminal conductor, and its sleeve portion 3a is compression-fastened to the exposed end of the conductor. The terminal conductor 3 has a sleeve 3a.
Has a contact head 3b, and a brim-shaped stopper 3c protruding at the connecting portion. Numeral 4 is a fixing ring, which is arranged so as to be slidable on the sleeve portion 3a and abut against the flange-shaped stopper 3c.
An insulating tape winding process 5 is performed from the sleeve portion 3a to the insulator 6. Reference numerals 8 and 8'are rubber mold stress cones, which are preliminarily applied to the shield layer 7 and the insulator 6 which are exposed by the step peeling, and the insulation tape winding reinforcement treatment 9 is applied from the end thereof to the insulation tape winding treatment 5. It is Reference numeral 10 is a grounding lead wire, which is connected to the shielding layer 7 and then drawn out.

The procedure for inserting and connecting the above-mentioned cable end portion structure with terminals will be described. First, the fixing ring 4 is pushed up while being pressed against the brim-shaped stopper 3c of the terminal conductor 3, and inside the bushing 12 of the power distribution device 11. By screwing the terminal conductor 3 into the power distribution device 11
Then, the contact head 3b comes into the bushing 12 and comes into contact with the tulip contact 14 in the bunsing 11. Reference numeral 13 is a conductor rod on the device side, and a tulip contact 14 is externally fitted to the conductor rod. Reference numeral 15 is a screw coupling portion between the fixing ring 4 and the bushing 12. By locking the flange-shaped stopper 3c with the fixing ring 4 screwed and fixed to the bushing 12, the terminal conductor 3 can be prevented from coming off, and thus the electrical connection between the terminal conductor 3 and the tulip contact 14 can be maintained. It is like this.

After the above electrical connection work, the insulating cylinder 16 which has been passed through the cable 1 side in advance is attached to the outer periphery of the bushing 12, and the opposite side is placed on the rubber mold stress cone 8 '. The insulation of the charging part can be protected by pressing and fixing with tape. 1
A cable bracket 7 is used to fix the three cables 1 together.

[0006]

In the above-mentioned conventional cable terminal portion structure, each portion of the terminal conductor 3, that is, the sleeve portion 3a, the contact head portion 3b and the collar-shaped stopper 3c are integrally formed, so that the fixing ring. 4 through the insulator 6 in advance, and then the terminal conductor 3 with the sleeve 3a.
After the compression fastening, the fixing ring 4 is moved to the side of the insulator 6, and the insulating tape winding process 5 is performed between the sleeve portion 3a and the end portion of the insulator 6.

By the way, in order to perform the above-mentioned series of operations, the size of the cable must be limited to a certain size. That is, since the size of the fixing ring 4 is determined in correspondence with the device-side bushing 12, the fixing ring 4 having the outer diameter of the cable insulator 6 applied thereto.
It is possible to pass the fixing ring 4 over the insulator 6 by limiting the size to a smaller inner diameter (taking into consideration the rubber mold stress cone 8'on the insulator 6). .

However, when it becomes necessary to connect a large-sized cable due to an increase in the capacity of the device, which causes the cable end to become large, the outer diameter of the insulator 6 is fixed as shown in FIG. The size of the ring 4 increases as it approaches the inner diameter of the ring 4, and the fixing ring 4 cannot move so as to shift toward the insulator 6 side, making it impossible to compress the sleeve portion 3a and to wind the insulating tape. . This is also due to the fact that the size of the bushing becomes smaller as the distribution equipment becomes more compact.

The above-mentioned problems are caused by the fact that the development of the cable connection portion is behind the development of the equipment and wrinkling occurs on the cable side. As a result, problems may occur when devices are replaced due to system changes in the distribution system, and the power outage time is extended excessively due to changes in the specifications of the cable connection structure, etc. The impact on them tends to be large.

In order to break the present state of the art described above, the present invention has an object to provide with high reliability a cable terminal portion which can be inserted and connected to a power distribution device even if the cable size becomes large. is there.

[0011]

DISCLOSURE OF THE INVENTION Provided by the present invention,
The cable terminal structure for inserting and connecting to a distribution device includes a sleeve part that is compression-connected to a conductor at the end of a distribution cable, a contact head that is inserted into a bushing on the device side and is inserted into a contact of the bushing, and those. The terminal conductor having a collar-shaped stopper that extends outward at a portion where the sleeve portion and the contact head are continuous, and the terminal conductor slidably arranged on the sleeve portion of the terminal conductor and abutted against the collar-shaped stopper. With a fixing ring screwed into the bushing, the terminal conductor has a contact head and a sleeve portion as a main body, and the collar-shaped stopper is separated and independent, and the collar-shaped stopper is detachably fixed to the body. It is characterized by

The detachable fixation of the collar-shaped stopper can be realized by screwing the collar-shaped stopper into the terminal conductor body. For this reason, it is desirable that the flange-shaped stopper has a ring shape and is threaded on the inner circumference and has a notch on the outer circumference in which a tool can be locked. Also, since the collar-shaped stopper receives a frictional rotational force when it is rotated with the fixing ring in contact, the screw of the collar-shaped stopper and the screw of the fixing ring have a reverse screw relationship, and the collar-shaped stopper is not It is advisable not to loosen it.

As another means for detachably fixing the collar-shaped stopper, the collar-shaped stopper is formed of a ring having a substantially C-shaped opening, and the terminal conductor body has a peripheral groove portion having a reduced diameter. It is possible to provide a structure in which the ring is fitted in the circumferential groove portion.

As still another means, the collar-shaped stopper is formed in a ring shape and is inserted into the contact head of the terminal conductor body, and the pin is inserted through the terminal conductor body to lock the collar-shaped stopper. A structure can be provided.

[0015]

FIG. 1 shows a first preferred embodiment of a cable terminal structure for inserting and connecting to a power distribution device according to the present invention. FIG. 2 shows an example of parts applied in the structure. An example is shown.

As shown in FIG. 1, a rubber mold stress cone 80 is integrally preliminarily formed on the insulator 60 which is exposed by the stripping of the sheath, the shielding layer and the like at the end of the power cable. Further, the terminal conductor 30 is integrally attached by compression fastening to the end of the conductor 20 which is exposed by the stripping of the insulator 60. Then, the terminal conductor 30 is, as shown in FIG.
The main body 31 and the collar-shaped stopper 32 of (a) are separated and independent. The collar-shaped stopper 32 is formed in a plate ring shape and has a threaded portion 35 on the inner periphery and a flat notch 36 (see FIG. 1) formed on the outer periphery for locking a tool. is there. The main body 31 has a sleeve portion 33 and a contact head portion 34 integrally formed by processing a copper rod or the like. Threading 37 is applied to the outer periphery of the base portion of the contact head 34 near the side where the contact head 34 and the sleeve 33 are connected.

The terminal conductor 30 having the respective parts formed as described above is attached to the main body 31 by compression-fastening with a sleeve 33 to the end of the conductor 20 which is exposed by stripping the insulator. Here, the insulating tape winding process 50 is performed over the already compressed sleeve portion 33 and the insulator 60, and thereafter, the fixing ring 40 is placed on the sleeve portion 33 through the contact head 34 side, and Pass the collar-shaped stopper 32 from the contact head 34 side,
By screwing the thread processing 35 of the collar-shaped stopper itself into the thread processing 37 on the main body side, the collar-shaped stopper 32
Then, the terminal structure as shown in FIG. 1 is obtained. Here, the collar-shaped stopper 32 can be easily rotated and screwed by locking a tool in the notch portion 36 of itself. In addition, 90 is an insulating tape winding reinforcement process performed between the insulating tape winding process 50 and the rubber mold stress cone 80.

In the cable end portion assembled as described above, the fixing ring 40 is provided with the collar-shaped stopper 32.
Device side bushing 1 shown in FIG.
By screwing the fixing ring 40 onto the contact ring 2, the contact head 34 is moved to the tulip contact 14 inside the bushing 12.
It is inserted into and is contacted with and the fixing ring 40 is bushing 1
As long as it is screwed and fixed to 2, the brim-shaped stopper 32 is locked, and thus the contact head 34 is prevented from coming off so that the contact with the tulip contact 14 is maintained, and a predetermined device connection is achieved.

The fixing ring 40 is provided with a thread 41 on the outer periphery for screwing into the bushing. By making the thread 35 of the collar-shaped stopper 32 have a reverse thread relationship with this thread, The collar-shaped stopper 32 can be prevented from loosening by the fixing ring 40 even if it receives a frictional rotational force.

In the embodiment described above, C of 6600V
When the V cable is applied to the high voltage cabinet, it is possible to apply the cable size up to 150 mm ² . This is because it is not necessary to attach the fixing ring 40 afterwards and shift it to the insulator side, and the fixing ring does not restrict the cable size. By the way,
In the conventional technology in which the size of the cable is restricted by the fixing ring, only a cable of 60 mm ² or less can be applied.

FIG. 3 shows a second embodiment of a cable terminal structure for inserting and connecting to a power distribution device according to the present invention, and FIG. 4 shows components applied in the structure.
The same parts as those in FIGS. 1 and 2 are designated by the same reference numerals.

In this embodiment, the collar-shaped stopper 32 'is a ring with an opening 39 formed in a C shape as shown in FIGS. 4 (a) and 4 (b), and one of the terminal conductor bodies 31' is contacted. A peripheral groove portion 38 having a reduced diameter is formed at the base portion of the head portion 34.

In the terminal conductor 30 of this embodiment in which the respective portions are formed in this way, the flange-shaped stopper 3'is fitted by fitting the flange-shaped stopper 32 'into the circumferential groove 28 from the opening 39 thereof.
2'is assembled to the terminal conductor body 31 '. According to this embodiment, the collar-shaped stopper 32 'can be mounted laterally on the terminal conductor body 31'.

FIG. 5 shows a third embodiment of a cable terminal structure for inserting and connecting to a power distribution device according to the present invention, and FIG. 6 shows components applied in the structure. The same parts as those in FIGS. 1 and 2 are designated by the same reference numerals.

In this embodiment, the collar-shaped stopper 32 "is formed in a ring shape, and the collar-shaped stopper 32" is axially inserted into the contact head 34 of the terminal conductor body 31 "from its tip side and set at a predetermined position. And pin 10
By arranging 0 through the contact head 34 of the terminal conductor body, the collar-shaped stopper 32 ″ is prevented from coming off. According to this embodiment, the collar-shaped stopper 3 is provided.
The shape of both 2 "and the terminal conductor body 31" can be simplified,
Easy to make. In addition, 34a is a hole for penetrating the pin 100. A spring pin is suitable for the pin 100 as shown in FIG.

[0026]

According to the cable terminal structure for inserting and connecting to the power distribution equipment according to the present invention as described above, the terminal conductor which is compression-fastened to the conductor exposed at the cable terminal is shaped like a collar. Since the stopper is separated and independent from the terminal conductor body consisting of the sleeve part and the contact head, and the flange-shaped stopper is detachably fixed to the main part of the terminal conductor body, it is fixed with the flange-shaped stopper removed. Can be disposed on the sleeve portion by passing the contact ring from the contact head side of the terminal conductor body in the axial direction, and by extension, the compression fastening of the sleeve portion to the conductor and the winding of the insulating tape over the sleeve portion and the insulator to which the compression fastening is applied. The processing can be performed freely with the fixing ring removed, and then the fixing ring is placed on the sleeve part and the collar-shaped stopper is fixed. It can be a cable terminal portion of and with locking ring with a constant terminal. As a result, the fixing ring does not need to be retracted to the cable insulator side during the compression fastening work of the terminal conductor or the insulating tape winding work, and therefore, the problem that the fixing ring imposes a restriction on the cable size can be solved. This means that it is possible to provide a cable terminal unit that is highly reliable and can respond quickly in a recent distribution system in which there is a tendency for larger cables to be required in order to reduce the size of equipment. Can make a great contribution to the improvement of

[Brief description of drawings]

FIG. 1 is an explanatory view showing a first embodiment of the present invention with a partial cross section.

FIG. 2 shows a terminal conductor applied to the cable end portion shown in FIG. 1, where (a) is a cross-sectional view of a collar-shaped stopper, (b).
FIG. 4 is a cross-sectional view of a terminal conductor body (sleeve portion and contact head portion).

FIG. 3 is an explanatory view showing a second embodiment of the present invention with a partial cross section.

FIG. 4 shows a terminal conductor applied to the cable end portion shown in FIG. 3, (a) being a cross-sectional view of a collar-shaped stopper,
(A ') is a front view of the flange-shaped stopper, and (B) is a sectional view of the terminal conductor body (sleeve portion and contact head portion).

FIG. 5 is an explanatory view showing a third embodiment of the present invention with a partial cross section.

FIG. 6 shows a terminal conductor applied to the cable end portion shown in FIG. 5, (a) is a cross-sectional view of the collar-shaped stopper, (b).
Is a sectional view of the terminal conductor body (sleeve part and contact head part),
(C) is a perspective view of the pin.

FIG. 7 is an explanatory view showing a conventional cable end portion in a plugged state and in a partial cross section.

FIG. 8 is an explanatory cross-sectional view showing an enlarged cable end portion of the same.

FIG. 9 is an explanatory diagram showing a problem example of the cable terminal section of the same.

[Explanation of symbols]

 11 Power Distribution Equipment 12 Bushing 13 Conductor Rod on Device Side 14 Tulip Contact 20 Conductor 30 Terminal Conductor 31, 31 ', 31 "Terminal Conductor Body 32, 32', 32" Collar-shaped Stopper 33 Sleeve Part 34 Contact Head 34a Hole 35 Screw processing 36 Notch 37 Screw processing 38 Reduced circumferential groove 39 Opening 40 Fixing ring 41 Screw processing 50 Insulating tape winding treatment 60 Insulator 80 Rubber mold stress cone 90 Insulating tape winding reinforcement treatment

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[Procedure amendment]

[Submission date] June 21, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 4

[Correction method] Change

[Correction content]

Claims (6)

[Claims] 1. A sleeve portion for compression-connecting to a conductor at an end of a distribution cable, a contact head portion inserted into a bushing on a device side and inserted into a contact of the bushing portion, and a portion where the sleeve portion and the contact head portion are continuous. A terminal conductor having a brim-shaped stopper that projects outwards at the end, and a fixing ring that is slidably arranged on the sleeve portion of the terminal conductor and that is screwed into the bushing while being abutted against the brim-shaped stopper. The terminal conductor is the contact head and the sleeve part as the main body, and the collar-shaped stopper is separated and independent, and the collar-shaped stopper is detachably fixed to the body. Cable end structure for connecting. 2. The cable terminal structure according to claim 1, wherein the flange-shaped stopper is screwed and fixed to the terminal conductor body. 3. The cable terminal structure according to claim 2, wherein the collar-shaped stopper has a ring shape and is threaded on the inner periphery and has a notch portion on the outer periphery to which a tool can be locked. 4. The cable terminal portion structure according to claim 2, wherein the screw of the flange-shaped stopper and the screw of the fixing ring have a reverse screw relationship. 5. The collar-shaped stopper is formed of a ring having a substantially C-shaped opening, and the terminal conductor body has a circumferential groove portion having a reduced diameter.
The cable terminal structure according to claim 1, wherein the ring with opening is fitted in the circumferential groove. 6. The cable according to claim 1, wherein the flange-shaped stopper is formed in a ring shape and is inserted into a contact head of the terminal conductor body, and the flange-shaped stopper is locked by arranging a pin through the terminal conductor body. Terminal structure.