JPH0656404B2 - High voltage cable prefabricated type connection electrical test equipment - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrical test device for performing an electrical withstand voltage test on a prefabricated connection of a high voltage cable such as a crosslinked polyethylene power cable (CV cable). .

2. Description of the Related Art High-voltage cables such as CV cables have restrictions on the length of cables for manufacturing, transportation and installation, and it is necessary to connect the cables to each other at the installation site.

Conventionally, various connection methods and devices have been proposed for connection of high-voltage cables, but recently, in terms of labor saving, that is, simplification of structure and assembly work, reduction in weight and size, high reliability, and cost reduction. A prefabricated connection part has been proposed, and a prefabricated connection part has been developed and put into practical use.

FIG. 6 illustrates an example of a typical prefabricated linear connection for CV cables currently in use.

The terminal portions of the cables C1 and C2 to be connected are subjected to terminal treatment for connection work, and the conductor portion 2 and the insulator (polyethylene) layer 3 are sequentially provided from the most distal conductor portion 2 to the outer sheath 6. , The semiconductive layer 4 and the copper tape layer 5 are exposed, and a stress cone 7 is integrally formed on the end portions of the cables C1 and C2 from the insulating layer 3 to the semiconductive layer 4.

Conductor connecting fittings 8a, 8b that can be screwed into each other are connected to the conductor portion 2 of each cable thus terminated, and a substantially cylindrical epoxy insulator in which a shielding cylinder 9 is integrally cast inside. It is inserted into the center hole 12 of the (insulating cylinder) 10 from both sides.

Conductor connection fittings 8a, 8 connected to the conductor 2 of each cable
b is located in the central hole portion 13 of the shield cylinder 9 and is electrically connected by being screwed together. In addition, a cable protection tube 14 is provided to prevent water, dust, and the like from entering through the connecting portion. One end of the cable protection cylinder 14 having a substantially cylindrical shape is connected to the insulating cylinder 10.
Is fixed to each end side wall portion using a screw 15, and the other end is fixed to the jacket sheath 6 of the cable with a waterproof tape 16.

Further, the stress cone 7 is urged toward the center of the insulating cylinder 10 by the stress cone pressing means 20 provided inside the protection cylinder 14. The pressing means includes a stress cone pressing member 22 that contacts the outside of the stress cone, and the protection cylinder 14
And a spring member 26 disposed between the stress cone push fitting 22 and the spring fitting 24. The spring member 26 is preferably arranged around a guide bar 28 which slidably supports the stress cone pressing member 22 with respect to the spring mounting washer 24.

The prefabricated straight-line connecting portion for the CV cable having the above-mentioned structure requires an electrical withstanding test of all the products or the connecting portion, in particular, the insulating cylinder 10. Conventionally, when performing such an electric test, the cables C1 and C2 and the connecting part components are
It was necessary to assemble and perform an electrical test in the state shown in FIG. 6, that is, in the same manner as in use. Also, of course, after the completion of the test, the connecting part components had to be disassembled in order to be shipped as a product.

Assembling and disassembling such a prefabricated type connecting portion for a CV cable requires a long time and is extremely complicated.

OBJECTS OF THE INVENTION Accordingly, the object of the present invention is to provide a high voltage cable in a short time,
In particular, it is an object of the present invention to provide an electric test device for a high-voltage cable prefabricated type connection portion, which can perform an electric withstand voltage test on an insulating cylinder.

Means for Solving the Problems The above object is achieved by the high voltage cable prefabricated type connection part electric test apparatus according to the present invention. In summary, the present invention provides a base and a fixed side that acts on a cable end portion of a cable with a stress cone inserted into one side of an insulation tube to be tested and applies a biasing force to the cable toward the center of the insulation tube to be tested. The stress cone pressing means, the simulated insulating busbar means with a stress cone that is inserted into the other side of the insulating cylinder under test to make electrical contact with the cable, and the fixed side stress cone pressing means cooperates with the insulating cylinder under test. A movable movable-side stress cone pressing means that acts on the simulated insulating bus bar means with a stress cone to apply a biasing force to the simulated insulating bus bar means with a stress cone toward the center portion of the insulating cylinder under test, and the moving means. Acting on the side stress cone pressing means, the fixed side stress cone pressing means, the cable end portion with the stress cone, the insulating cylinder under test, the simulated insulating bus bar means with the stress cone, and A high-voltage cable Prefabricated connecting part electrical test apparatus characterized by comprising an actuating means allowed to closely bonded dynamic side stress cone pressing means.

Next, the high voltage cable prefabricated type connection part electrical test apparatus according to the present invention will be described in more detail with reference to the drawings.

Referring to FIG. 1 and FIG. 2, the high voltage cable prefabricated type connection part electric test apparatus 100 has a base 102, and the fixed side stress cone pressing means 120 is attached to the base 102.

As will be easily understood by also referring to FIG. 3, the fixed-side stress cone pressing means 120 includes a horizontal plate 121 for fixing to the base 102, and a vertical plate provided vertically to the horizontal plate 121. 122, that is, a stopper fitting. A through hole 123 is formed in the stopper fitting, and a generally cylindrical stress cone pushing fitting 124 is slidably fitted in the through hole 123.

An annular spring mounting member 125 having a hole 130 in the center thereof is attached to the stopper metal member 122 by a connecting bar 126 in parallel with the stopper metal member 122 and at a predetermined distance. Further, the spring cone bar 127 is provided on the stress cone pressing member 124 so as to extend in a direction perpendicular to the outer side wall of the member and be spaced apart from each other by a predetermined distance in the circumferential direction.
, And the free end of the spring guide bar 127 is slidably fitted to the spring fitting 125.
Every other spring guide bar 127 is provided with a screw portion in a spring guide portion protruding from the spring mounting member, and a nut 128 is screwed into the screw portion. The nut 128 functions as a stopping means (stopper) to the outward of the stress cone pushing fitting as described later. A spring member 129 is arranged so as to surround the spring guide bar 127 and between the outer wall of the stress cone pressing member 124 and the spring mounting member 125. With such a configuration, the stress cone pressing member 124 is biased in the direction of arrow X in FIG. Due to the action of the nut 128, the stress cone pressing member 124 is not disengaged from the stress cone pressing means 120 by the urging force of the spring member 129.

On the other hand, facing the fixed stress cone pressing means 120, a movable side stress cone pressing means 140 which is not fixed to the base 102 and is movable is provided. The stress cone pressing means 140, as best shown in FIG.
And a parallel stopper metal fitting 142 and a spring mounting metal fitting 143 which have substantially the same structure as and are connected by a connecting bar 141.
(Unlike the spring fitting 125, a center hole such as the hole 130 is not formed).

A center hole 144 is formed in the stopper metal fitting 142,
A stress cone pressing member 145 is slidably fitted in the hole. A spring guide bar 146 is implanted in the stress cone pressing member 145, and the spring guide bar 1
The other end of 46 is slidably fitted to the spring mounting member 143. Like the fixed-side stress cone pressing means 120, the spring guide bar 146 is provided with a screw portion at every other spring guide bar portion protruding from the spring mounting member 143, and the screw portion is provided at the screw portion. Nuts 1
47 is screwed. The nut 147 serves as a means for stopping the stress cone pressing member 145 from the outside, as described later. Enclosing the spring guide bar 146, the outer wall of the stress cone pressing member 145 and the spring mounting member 143.
A spring member 148 is disposed between the and. With such a structure, the stress cone pressing member 145 is biased in the direction of the arrow Y in FIG. Due to the action of the nut 147, the stress cone pressing member 145 will not be disengaged from the stress cone pressing means 140 by the urging force of the spring member 148.

When using this device, referring to FIG. 5, for example, the stress cone pressing means 120 is equipped with the high-voltage cable C which has been subjected to the end treatment as described above, and the stress cone pressing means 120 has a stress cone. The push fitting 124 is brought into contact with the stress cone 7 of the high-voltage cable. In the device of the present invention, a conductor end fitting 8 having a T-shaped vertical section is provided on the conductor portion 2 of the cable.
a is fixed. Further, the cable is loosely held by the cable retainer 103 provided at the end of the base.

In the above structure, the epoxy insulator to be subjected to the withstand voltage test, that is, the insulating cylinder 10 to be tested is arranged on the side of the stress cone pressing means 120 so that the end portion of the cable fits into the one central hole 12. It As a result, the conductor portion 2 of the cable is inserted into the shield tube 9 of the insulation tube 10 to be tested. Next, the center hole 1 on the other side of the insulating cylinder 10 to be tested
A simulated insulation busbar means 160 with a stress cone, which has substantially the same shape as the cable end portion, is attached to the cable 2.

The simulated insulated bus bar means with a stress cone is shown in FIGS.
As shown in the figure, it has a conductor portion 162 at the center and an epoxy insulator portion 164 whose outer shape has the same diameter as the insulator sheath 6 of the cable. The conductor 162 is provided so as to slightly project from the tip of the insulator 164, and the tip of the conductor 162 is provided with a contact spring member 167 for making electrical contact with the conductor connection fitting 8a of the cable C. In addition, the epoxy insulating portion 164 has a stress cone 1 having the same shape as the stress cone formed on the cable.
66 is formed.

When the simulated insulation busbar means 160 with a stress cone having such a configuration is inserted into the center hole 12 of the insulating cylinder 10 under test, the stress cone 166 of the simulated insulation busbar means 160 with a stress cone is inserted into the stress cone of the stress cone pressing means 140. The push fitting 145 is abutted. This state is shown in FIG.

In the state shown in FIG. 5, the stress cone pressing fittings 124, 1 of the stress cone pressing means 120, 140 are shown.
No. 45 is simply in light contact with each stress cone 7, 166, and accordingly, the cable C and the simulated insulating bus bar means 160 with stress cone are connected to the central hole 12 of the insulating cylinder 10 to be tested.
It is not strongly pushed in, and there are gaps t1, t between the side surfaces of the insulating cylinder 10 to be tested and the stopper fittings 122, 142.
Spaced apart by two.

The device according to the invention comprises means 170 for actuating said stress cone pressing means 140, as illustrated in FIGS. The means 170 is provided with a push screw fitting 171 and a spring pushing screw 172 is screwed to the fitting 171. Further, one end of the spring pushing screw 172 abuts on the spring fitting 143 of the stress cone pushing means 140, and the other end thereof is the handle 17
3 is fixed. The push screw mounting bracket 171 is the base 1
It is placed on the support base 174 fixed to 02. or,
One end of a swing arm 175 is fixed to the push-screw mounting member 171, and the other end of the arm 175 has a pin 17
6, the hinge means 177 provided on the stopper fitting 122 of the stress cone pressing means 120 is pivotally attached, and accordingly, the push screw attaching means 170 is swingable in the direction of arrow A in FIG. 2 with the pin 176 as a fulcrum. It is said that

The operator rotates the handle 173 in a state where the push screw attaching means 170 is placed on the support base (solid line state in FIG. 2). As a result, the spring pushing screw 172 comes into contact with the spring fitting 143 of the stress cone pushing means 140 and pushes the fitting in the arrow Y direction in FIGS. 1 and 5. Fifth
As can be seen in the figure, the stress cone pressing means 14
When the spring mounting bracket 143 of 0 is pushed in the arrow Y direction,
The metal fitting 143 presses the spring 148, and as a result, the stress cone pressing metal fitting 145 and the stress cone 166 are strongly pressed in the arrow direction. The insulating cylinder 10 under test pushed by the stress cone 166 moves in the arrow Y direction, and resists the spring force of the stress cone pushing means 120 in the arrow X direction, and the stress cone 7 of the cable C and the stress cone pushing metal fitting 12 are pushed.
4 is pushed in the direction opposite to arrow X, that is, in the direction of arrow Y.

As a result, both side surfaces of the insulating cylinder 10 to be tested come into contact with the stopper fittings 122 and 142, and the connection portion changes from the state of FIG. 5 to the state of FIG. Further, in the state shown in FIG. 5, the contact spring member 167 provided at the tip of the conductor of the simulated insulated bus bar means 160 with a stress cone and the conductor connecting fitting 8a of the cable C are provided.
Those separated from are brought into contact with each other as shown in FIG.

Then, a desired voltage is applied between the cable C and the conductor 162 of the simulated insulated bus bar means 160 with a stress cone,
A withstand voltage test of the insulating cylinder 10 under test is performed.

When the electric test is completed, the handle is operated so that one end of the spring pushing screw 172 is pressed by the stress cone pushing means 140.
Away from the spring mounting bracket 143 and then as shown in phantom line in FIG.
Is rotated in the direction of arrow A. As a result, the stress cone pressing means 140 and the simulated insulation busbar means with stress cone 160 are easily removed from the insulating cylinder 10 to be tested, and the test insulating cylinder 10 is also detached from the cable end portion.

According to the preferred embodiment of the present invention, the roller 104 is provided on the upper surface of the base 102, so that the insulating cylinder 10 under test can be easily attached to and detached from the device.

EFFECTS OF THE INVENTION The electrical test apparatus for the high-voltage cable prefabricated type connection section according to the present invention configured as described above is easy to operate, and the insulating cylinder as the DUT can be easily attached to and detached from the apparatus. Therefore, it is possible to perform an electrical withstand voltage test of the high-voltage cable, particularly the insulating cylinder, in a short time.

[Brief description of drawings]

FIG. 1 is a plan sectional view taken along the line 1-1 of the high-voltage cable prefabricated type connection part electrical test apparatus according to the present invention. FIG. 2 is a front view of the device of FIG. FIG. 3 is a perspective view of the fixed-side stress cone pressing means. FIG. 4 is a perspective view of the moving-side stress cone pressing means. FIG. 5 is a sectional view similar to FIG. 1, showing a state during assembly of the high-voltage cable prefabricated type connection part electrical test apparatus according to the present invention. FIG. 6 is a cross-sectional view of a high-voltage cable prefabricated connection part. 2: Cable conductor part 8a: Conductor connection metal fitting 7: Cable stress cone 10: Insulation cylinder to be tested 120: Fixed side stress cone pressing means 122: Stopper metal fitting 124: Stress cone pressing metal fitting 125: Spring mounting metal fitting 129: Spring member 140 : Moving side stress cone pressing means 142: Stopper metal fitting 143: Spring mounting metal fitting 145: Stress cone pressing metal fitting 148: Spring member 160: Simulated insulating bus bar means with stress cone 162: Conductor 164: Insulator part 166: Stress of insulating bus bar means Cone 170: Actuating means 171: Push screw mounting bracket 172: Spring push screw 173: Handle

Front Page Continuation (72) Inventor Osamu Kobayashi 2-1-1 Oda Sakae, Kawasaki-ku, Kawasaki-shi, Kanagawa Showa Electric Wire & Cable Co., Ltd.

Claims (4)

[Claims] 1. A fixed-side stress cone that acts on a base and a cable cone-equipped cable end portion inserted into one side of an insulating cylinder to be tested and applies a biasing force to the cable toward the center of the insulating cylinder to be tested. The pressing means, the simulated insulating busbar means with a stress cone that is inserted into the other side of the insulating cylinder to be tested to make electrical contact with the cable, and the fixed-side stress cone pressing means cooperate to clamp the insulating cylinder to be tested. Therefore, movable movable-side stress cone pressing means, which acts on the simulated insulated bus bar means with a stress cone and applies a biasing force to the simulated insulated bus bar means with a stress cone toward the central portion of the insulating cylinder under test, and the moving-side stress Acts on the cone pressing means, the fixed side stress cone pressing means, the cable end portion with the stress cone, the insulating cylinder under test, the simulated insulating bus bar means with the stress cone and the moving side sleeve. High voltage cables prefabricated connecting part electrical test apparatus characterized by comprising an actuating means allowed to closely bonded to Resukon pressing means. 2. The fixed-side stress cone pressing means includes a stopper fitting attached to a base, an annular spring fitting provided in parallel to the stopper fitting and spaced apart by a predetermined distance, and the stopper fitting. A stress cone pressing member having a substantially cylindrical shape slidably fitted in the formed through hole, and the stress cone pressing member is provided between the stress cone pressing member and the spring mounting member. Is biased outward by a spring means, and the moving-side stress cone pressing means is a stopper fitting and an annular spring mounting fitting provided in parallel to the stopper fitting and at a predetermined distance. A stress cone push fitting having a substantially cylindrical shape slidably fitted in a through hole formed in the stopper fitting, the stress cone push fitting being the stress cone push fitting. The device ranges Claim 1 wherein the biased by comprising claims outwardly at spring means provided between the spring mounting bracket. 3. A simulated insulation busbar unit with a stress cone, wherein a conductor portion arranged in a central portion, an insulator portion surrounding the conductor portion, and a stress cone formed in the insulator portion. An apparatus according to claim 1 or 2 comprising: 4. The actuating means comprises a push screw mounting metal fitting, and a spring pushing screw screwed to the metal fitting and having one end abutting on a spring mounting metal fitting of the moving side stress cone pressing means and the other end having a handle fixed thereto. 4. The pressing screw mounting bracket is configured to be swingable by a swing arm pivotally mounted on a stopper bracket of the stress cone pressing means. The device according to paragraph.