JPH099479A - Insulation structure of cable connection part - Google Patents

Abstract

PURPOSE: To quickly, easily, and positively perform insulation treatment operation by joining a first cover body in semicylindrical shape for surrounding the connection part of the conductor of a cable and a second cover body in semicylindrical shape which is connected by a hinge by a connection gear-lock member and at a bending part. CONSTITUTION: First and second cover bodies 19 and 21 are completely closed to form a cylindrical body and a cable connection part is enclosed for insulation A bending part 22 of the cover bodies 19 and 21 is held and a recessed slide rod 23 is inserted and fixed. And, connection members are provided at an insulation cover 18 symmetrically on a cover side surface when placing a cover so that a plurality of covers can be connected, thus connecting a plurality of covers and hence easily, positively, and quickly performing the insulation treatment operation of the cable connection part at one touch and re-utilizing the insulation cover.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulating structure of a cable connecting portion for applying insulation treatment to a cable connecting portion connecting a power cable of a motor or the like to an external power cable in electric work such as a nuclear power plant.

[0002]

2. Description of the Related Art A nuclear power plant is provided with a pump for circulating a fluid, and a motor is used as a power source of the pump. A conventional example of the insulating structure of the power cable connecting portion of the motor or the like will be described with reference to FIGS.

FIG. 10 shows a state in which a motor 3 and a pump 4 are connected by a coupling 5 and installed on a base 2 installed on the floor 1. A connection box 6 is provided in the motor 3, and a taping treatment 9 is applied to a cable connection portion between the motor power cable 7 and the external power cable 8. The external power supply cable 8 passes through the flexible conduit 10 and the embedded conduit 11 from the floor 1. The flexible conduit 10 and the embedded conduit 11 are connected.

That is, in the state of FIG. 10, the flexible conduit 10 is installed between the embedded conduit 11 and the connection box 6 of the motor 3 to form a cable route. When the cable route is completed, the external power supply cable 8 serving as the power source of the motor 3 is installed in the cable route.

When the external power supply cable 8 is laid, the core wire 8a of the external power supply cable 8 is terminated in the connection box 6 with the crimp terminal 12 as shown in FIG. Connect to the motor power cable 7. After the connection is completed, the cable connecting portion 14 is insulated by the taping method for each core wire 8a in order to prevent a short circuit and a ground fault of the external power cable 8.

As an insulation treatment means for applying the taping treatment 9, an empire cloth 15 is wound around the cable connection portion 14 as shown in FIGS. It is supposed that at least two reciprocations are wound until the corners of the 14 bolts 13 are eliminated, and then the vinyl tape 17 is wound one reciprocation with 1/2 lap for finishing.

FIG. 12 shows a taping procedure 9 at the cable connecting portion.
The insulation treatment state is shown. Taping procedure 7
After the above, the lid (not shown) of the connection box 6 is closed to complete the insulating work. After the connection work of the external power cable 8 is completed in this manner, the power source is utilized to perform a unit test of the motor 3 or the like.

After the construction of the nuclear power plant was completed,
It is necessary to carry out facility inspections at regular intervals after starting operation. At this time, the motor 3 is also disassembled and inspected. As a means of disassembly and inspection, the reactor is stopped and the isolation work of the relevant system is completed. Separate with.

On the cable side, the motor 3 is turned off, the lid (not shown) of the connection box 6 is opened, and the vinyl tape 17, the cellbon tape 16, and the empire cloth 15 of the cable connection portion 14 are stripped off in order.

Next, the bolt 13 of the connection portion 14 is removed, the motor side power cable 7 and the external power cable 8 are separated, the flexible conduit 10 is removed, and then the motor 3 is moved from the base 2 and disassembled and inspected in the inspection area. To do. After this, when the disassembly and inspection of the motor 3 is completed, the motor 3 is mounted on the base 2
It is installed on top of and is directly connected to the pump 4 by the coupling 5.

Further, the flexible conduit 10 is attached to the connection box 6, and the external power cable 8 and the motor power cable 7 are connected by the bolt 13. Further, the connecting portion 14 is newly insulated with the empire cloth 15, the cerbon tape 16 and the vinyl tape 17, and the lid (not shown) of the connecting box 6 is closed to complete the work.

[0012]

The insulation treatment means for the cable connecting portion by taping in the electric work as described above has the following problems. (1) For taping, wrap the empire cloth 15 and wrap the cellon tape 16 with 1/2 wrap until the corners of the bolts 13 at the connection part disappear (at least 2 reciprocations) and finish with 1/2 the vinyl tape 17. It requires a large number of man-hours because it is supposed to be wrapped in one reciprocating wrap. (2) The amount of digested material is reduced because tapping is performed by a worker who has been certified as a skill, and the start of the test is delayed due to the delay in taping work. (3) Although the motor is disassembled and inspected during the scheduled inspection of nuclear power generation, once the power cable is disconnected, the empire cloth, cerbon tape, and vinyl tape (hereinafter referred to as taping material) cannot be reused, so radioactive waste is generated. Become. (4) Since taping is required at the time of inspection of the nuclear power plant at a predetermined period, it takes a lot of man-hours, so that the work time is extended and the exposure dose of the worker is increased.

The present invention has been made to solve the above-mentioned problems, and in the insulation treatment performed for the treatment of the power cable connection portion of the pump motor or the like installed in the nuclear power plant or the like, the work is simple and easy in a short working time. Cable connection that can reliably perform insulation treatment work, which can shorten the construction period of the nuclear power plant, reduce the number of man-hours, shorten the period of regular inspection, reduce man-hours, reduce radioactive waste and reduce exposure. It is to provide an insulating structure of the part.

[0014]

According to the present invention, there is provided a first half-cylindrical cover body surrounding a connecting portion of a core wire of a cable,
Second half-cylindrical cylinder hinged to the first cover body
The cover body, the second cover body, and the connecting and locking member provided on the outer surface of the first cover body, and the first cover body.
And a bent portion provided at each of the longitudinal end portions of the second cover body, and a stopper fitting for joining these bent portions.

[0015]

In insulating the power cable connecting portion of the pump motor or the like installed in, for example, a nuclear power plant, the first and second cover bodies use the hinge as a fulcrum to form the first and second hinges.
Open the cover body of to enclose the cable connection. Close the first and second cover bodies, insert a stopper into the bent portion formed at the edge of the cover body, and slide it.
The cable cover is insulated by the second cover body. Reverse this procedure to release the insulation.

Velcro tapes are attached to both ends of the cover body, and the cover body is narrowed down according to the size of the cable, and side-to-side symmetrical portions of the cover body are provided with concavo-convex connecting and locking members so that a plurality of cover bodies can be connected.

The cover connecting / fixing jig for connecting the adjacent insulating covers has a main body made of an arcuate member, and the arcuate member is connected by a support shaft and comprises a long pin which can be opened and closed in a fan shape. The long pin has a hooking hole at its tip, and the arcuate member has a hook. The long pin of the cover connecting and fixing jig is inserted into the connecting and fixing hole provided in the concave slide bar and the cover body in a skewered manner, and the hook is inserted into the hooking hole to close the cover connecting and fixing jig.

Therefore, according to the present invention, anyone can easily and reliably insulate the cable connection portion with one touch, and thus work can be performed in a short time without the need for qualification, and the insulating cover can be reused.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the insulation structure of a cable connecting portion according to the present invention will be described with reference to FIGS. FIG. 1 shows an installed state of a motor and a pump having an insulating structure of a cable connecting portion according to this embodiment. At the nuclear power plant, when the operation is started after the construction is completed, it is necessary to perform the facility inspection at regular intervals.
The overhaul and inspection will also be performed.

That is, in FIG. 1, a motor 3 and a pump 4 are installed by being connected by a coupling 5 to a base 2 installed on the floor 1, a connection box 6 is provided in the motor 3, and a power cable for the motor is provided. The cable connecting portion between the external power supply cable 7 and the external power supply cable 8 is surrounded by an insulating cover 18 and insulated. The external power supply cable 8 passes through the flexible conduit 10 and the embedded conduit 11 from the floor 1, and the flexible conduit 10 and the embedded conduit 11 are connected.

When the external power supply cable 8 is laid, the core wire 8a of the external power supply cable 8 is terminated in the connection box 6 by the crimp terminal 12 as described with reference to FIG. Connecting. After the connection is completed, the cable connecting portion 14 is surrounded by an insulating cover 18 for each core wire 8a in order to prevent a short circuit and a ground fault of the external power cable 8, and an insulation treatment is performed.

FIG. 2 is a perspective view showing a state in which a cable connecting portion between the motor-side power cable 7 and the core wire 8a of the external power cable 8 is surrounded by an insulating cover 18 to be insulated. The insulating cover 18 includes a first half-cylindrical first cover body 19 as shown in FIGS.
The second cover body 21 has a half-cylindrical shape and is joined to one side edge portion of the 19 by a hinge 20.

The first cover body 19 and the second cover body 21
Of the other side of the side opposite to the hinge 20 are formed with bent portions 22 that are bent into L-shapes respectively, and the first and second cover bodies 19 and 21 are closed to form a cylindrical bent portion 22. Is contacted, and the recessed slide bar 23 shown in FIG. 6 is covered from above to surround the contacted portion as a stopper.

As shown in FIGS. 4 and 5, the first
The concave connecting member 24 along the center of the outer surface of the cover body 19 of
Is provided, and a convex-shaped connecting member 25 is provided along the center of the outer surface of the second cover body 21. The convex connecting members 25 are fitted in the concave connecting members 24 so that they can be connected to each other.

A coupling fixing hole 26 is provided on the side surface of the concave slide rod 23, and the long pin 29 shown in FIG. 8 is inserted into the coupling fixing hole 26 to insert the elongated pin 29 shown in FIGS. The insulating covers 18 are connected to each other as shown in FIG. First cover body 19
As shown in FIGS. 3 and 4, a velcro tape 27 is attached to the inner surface and the end portion of the second cover body 21.

FIG. 7A shows a state in which the first cover main body 19 and the second cover main body 19 are bent from the hinge 20 and are combined at the bent portions 22 into a cylindrical body so that the cable connecting portion can be insulated. Is shown. In this cylindrical state, a concave slide bar 23 as a stopper shown in FIG. 7B is inserted from the lateral side so as to cover the bent portion 22 from above, and the bent portion 22 is contacted and fixed. To do.

In such a state, as shown in FIG.
Using the cover connecting and fixing jig 28 shown in FIG.
Three adjacent insulating covers as shown in (a) and (b)
18 pieces are connected and fixed.

That is, the cover connecting and fixing jig shown in FIG.
The main body 28 is an arcuate member, and is composed of a long pin 29 rotatably attached to the arcuate member via a support shaft 30. The long pins 29 are inserted into the fixing and fixing holes 26 of the concave slide rods 23 provided on the insulating covers 18 in a skewered shape, and as shown in FIG. The hook 31 is inserted into the hooking hole 32 provided at the tip of the long pin 29 and fixed with a pin. As shown in FIG.
Connect comrades.

Next, an insulation treatment method for the cable connecting portion of the cable connecting portion insulating structure according to the above embodiment will be described with reference to FIGS. 1 to 9. First, this insulation cover 18
Before surrounding the cable connecting portion, as shown in FIGS. 3 to 5, the first and second cover bodies 19 and 21 are open with the hinge 20 as a fulcrum so as to enclose the cable connecting portion 14. After the cable connecting portion is surrounded, as shown in FIGS. 2 and 7, the first and second cover bodies 19 and 21 are completely closed to form a cylindrical body to wrap the cable connecting portion and insulate the cable connecting portion. It is a mechanism to do.

Next, in order to stop the insulating cover 18 that wraps around the cable connection portion, a concave slide rod 23 that inserts the bent portion 22 of the cover bodies 19 and 21 is inserted. Then, the slide bar 23 is fixed by the cover connecting and fixing jig 28 so as not to come off.

Velcro tapes 27 are attached to both ends of the cover bodies 19 and 21 so that they can be narrowed down according to the cable sizes of the external power cable 8 and the motor power cable 7.

Further, the insulating cover 18 is attached to the insulating cover 18 so that a plurality of such covers can be connected (see FIGS. 2 and 7).
It is possible to connect a plurality of covers to each other by providing a concavo-convex portion symmetrically on the side surface of the cover.

Next, the insulation treatment method for the cable connecting portion will be described by taking the construction of the nuclear power plant and the periodic inspection as an example. First, as shown in FIG. 1, the pump 4 and the motor 3 are installed on the foundation table 2, and then the floor 1 is installed in advance.
A flexible conduit 10 is installed between the embedded conduit 11 embedded in the cable and the connection box 6 provided in the motor to form a cable route. When the cable route is completed, an external power cable 8 for supplying electric power to the motor 3 is laid inside the cable route 1.

When the external power cable 8 is laid, the core wire 8a of the external power cable 8 is terminated in the connection box 6 with the crimp terminal 12 as shown in FIG. 11 and connected to the motor side power cable 7 with the bolt 13. . After the connection is completed, the cable connection part 14 is provided for each core wire 8a in order to prevent short circuit and ground fault of the cable 8.
As shown in FIG. 2, insulating treatment is performed by the insulating cover 18.

After that, the cable connecting portion 14 is wrapped in such a manner that it is folded in two with the hinge 20 of the cover center line of the insulating cover bodies 19, 21 (see FIGS. 3 and 5) as a boundary. As a way of stopping after wrapping, the concave slide rod 23 is inserted into the bent portion 22 provided in the cover bodies 19 and 21 so as to cover the concave slide rod 23 from above and the cover bodies 19 and 21 are fixed. .

Next, both ends of the insulating cover 18 are narrowed down and fixed by using the magic tapes 27 provided on both ends of the cover 18 so as to match the cable sizes of the external power cable 8 and the motor side power cable 7.

Further, in order to connect the insulating covers 18 to each other, the concavo-convex connecting members 24 provided symmetrically on the side surfaces of the covers,
Engage 25 and slide. By doing so, a plurality of connections are made, and the slide rod 25 is engaged with the bent portion 22 of the insulating cover 18.

Thereafter, in order to prevent the slide rod 23 from falling off, a cover connecting jig 28 is inserted sideways into the bent portion 22 of the insulating cover 18 and the joint fixing hole 26 formed in the slide rod 23 in a skewered shape from the side. To do.

After the construction of the nuclear power plant is completed,
When the operation is started, it is necessary to inspect the equipment at regular intervals. At this time, the motor 3 is also disassembled and inspected. As a disassembly and inspection procedure, when the reactor is stopped and the isolation work of the relevant system is completed, the pump 4 and the motor 3 are separated from each other by the coupling 5 on the main body side.

On the cable side, the power of the motor 3 is turned off, the lid (not shown) of the connection box 6 is opened, the tapes are attached to the velcro tapes 27 on both ends of the insulating cover 18, and then the cover connecting and fixing jig 28 is removed. Slide the concave-convex connecting members 24, 25 and pull out. Finally, the slide rod 23 is pulled out and the insulating cover 18 is removed.

Next, the bolts 13 of the cable connecting portion 14 are removed, the motor side power cable 7 and the external power cable 8 are separated, the flexible conduit 10 is removed, and then the motor 3 is moved from the base 2 and disassembled and inspected in the inspection area. I do. After that, when the disassembly and inspection of the motor 3 is completed, the motor 3 is set on the foundation table and directly connected to the pump 4 by the coupling 5.

Further, the flexible conduit 10 is attached to the connection box 6 and the external power cable 8 and the motor side power cable 7 are connected by bolts. After that, the connection portion is insulated by using the insulating cover removed before the inspection, the lid of the connection box 6 is closed, and the work is completed.

[0043]

As described above, according to the present invention, the insulation treatment is performed by the insulation cover, so that the working time and the man-hour can be greatly reduced as compared with the conventional taping insulation treatment. Also, since no special qualification is required for attaching and detaching the insulating cover according to the present invention, even an unqualified worker can easily and surely perform the insulation treatment, and the both ends of the cable are fixed by the concave and convex sliding type and the velcro. Can be surely removed.

Further, at the time of periodic inspection, the insulation treatment work time and the man-hours are reduced, which contributes to the reduction of the worker's exposure, and the use of the insulating cover allows the detachable attachment and detachment as many times as possible to reduce the waste.

Therefore, when the present invention is applied to the construction and periodic inspection of a nuclear power plant or the like, the insulation treatment time is shortened, the waste of the insulation cover can be reused, and the number of insulation treatment work steps is reduced. It is possible to reduce the exposure of workers by securing and shortening the insulation treatment time, thereby shortening the construction period and the number of man-hours for nuclear power plant construction and periodic inspection, and reducing radioactive waste and exposure.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an installed state of a motor and a pump for explaining an embodiment of an insulating structure of a cable connecting portion according to the present invention.

FIG. 2 is a perspective view showing an embodiment of an insulating structure of a cable connecting portion according to the present invention.

3 is a development view of the cover main body in FIG. 2 opened and viewed from the inside.

FIG. 4 is a side view seen from the direction of arrow aa ′ in FIG.

5 is a perspective view of the cover main body in FIG. 3 as viewed from the outside.

FIG. 6 is a perspective view showing a stopper fitting for inserting the bent portion in FIG.

FIG. 7 is a front view showing a state where the cover main body in FIGS. 3 and 5 is closed.

8A is a perspective view showing an open state of a connecting and fixing jig for connecting the insulating covers to each other by skewering the cover body and the concave slide bar in FIG. 5, and FIG. 8B is a perspective view of FIG. The perspective view which shows the state closed from the state.

9A is a plan view showing a state in which the insulation fixing members are connected to each other by skewering the connection fixing jig shown in FIG. 8; FIG.
Side view.

FIG. 10 is a schematic configuration diagram showing an installation state of a motor and a pump for explaining a conventional insulating structure of a cable connecting portion.

11 is a perspective view for explaining a means for applying insulation treatment by taping treatment to the cable connecting portion in FIG.

FIG. 12 is a perspective view showing a state in which the cable connecting portion in FIG. 11 is insulated by taping.

[Explanation of symbols]

1 ... Floor, 2 ... Foundation stand, 3 ... Motor, 4 ... Pump, 5 ... Coupling, 6 ... Junction box, 7 ... Motor power cable,
8 ... External power cable, 8a ... Core wire, 9 ... Taping treatment, 10 ... Flexible conduit, 11 ... Embedded conduit, 12 ... Crimp terminal, 13 ... Bolt, 14 ... Cable connection part, 15 ... Empire cloth, 16 ... Cerbon tape, 17 ... Vinyl tape, 18 ... Insulation cover, 19 ... First cover body, 20 ... Hinge, 21 ... Second cover body, 22 ... Bent portion, 23 ... Recessed slide bar, 24 ... Concave connecting member, 25 ... convex connecting member,
26 ... Connection fixing holes, 27 ... Velcro, 28 ... Cover connection fixing jig, 29 ... Long pin, 30 ... Spindle, 31 ... Hook, 32
… Hook holes.

Claims (6)

[Claims] 1. A half-split tubular first cover body surrounding a connecting portion of a core wire of a cable, a half-split tubular second cover body hinged to the first cover body, and the second half.
Connecting main body of the cover body and the outer surface of the first cover body, bent portions provided at the longitudinal ends of the first and second cover bodies, and the bent portions thereof. An insulating structure of a cable connecting portion, comprising: a stopper fitting for sandwiching and joining the portion. 2. The insulating structure for a cable connecting portion according to claim 1, wherein the connecting and locking member includes a concave member and a convex member fitted into the concave member. 3. The cable according to claim 1, wherein the stopper is a long concave slide rod that surrounds the bent portion and sandwiches the bent portion, and has a coupling fixing hole. Insulation structure of connection part. 4. The insulating structure for a cable connecting portion according to claim 1, wherein a velcro tape is lined on the end portions of the first and second cover main bodies. 5. The stopper, which joins the bent portion,
The fixing metal fittings of the other cover bodies adjacent to the fixing metal fittings are provided with coupling fixing holes, respectively, and the cover fixing jigs are skewed into the coupling fixing holes to connect the insulating covers to each other. The insulating structure for a cable connecting portion according to claim 1. 6. The cover connecting / fixing jig has a long pin connected by a support shaft, and a hooking hole provided at a front end of the long pin is provided at a front end of the cover connecting / fixing jig. The insulation structure for a cable connecting portion according to claim 1, wherein the hook is hooked and locked.