JP6700603B2 - Power cable termination connection and power cable line - Google Patents

Description

  The present invention relates to a terminal connection portion of a power cable and a power cable line.

  As the power cable, a power cable having a cable insulator on the outer periphery of a conductor is used, and a typical example is a CV cable using a crosslinked polyethylene resin as the cable insulator. Usually, when a power cable line is constructed using a power cable, a terminal connection part for connecting to an overhead line or other power equipment (for example, a switchgear (breaker) or a transformer) is provided at the end of the power cable. It is provided (for example, see Patent Documents 1 to 3).

  Examples of the terminal connection portion of the power cable include a configuration in which a conductor lead-out rod is connected to the tip of the conductor exposed by stripping off the end portion of the power cable, and the cable end portion is inserted into a bushing to be housed (for example, , Patent Documents 1 and 2). The bushing has a lead-out opening portion for pulling out the conductor lead-out rod at one end side thereof, and the conductor lead-out rod is pulled out from the lead-out opening portion. An upper metal fitting having an insertion hole through which the conductor leading rod is inserted is attached to the end surface of the extraction opening, and is sealed by the upper metal fitting. For the bushing, for example, a porcelain tube or a resin tube such as an epoxy resin (insulator tube) is used.

  The terminal connection part is roughly classified into an air end connection part (EB-A) for connecting an electric power cable to an overhead line, a gas for connecting to a gas-insulated power device such as GIS (gas switchgear). There is a terminal connection (EB-G) and an oil-terminated terminal (EB-O) for connecting to oil-insulated power equipment such as an oil-filled transformer. Of these, the gas end connection part and the oil end connection part are provided with a bushing with a conductor extraction rod drawn out inside the equipment case of the power equipment, and the insulation gas or insulating oil filled in the equipment case is insulated. The medium ensures the insulation between the conductor extraction rod and the equipment case.

JP, 9-191548, A JP, 10-51937, A JP 2005-6379 A

  There is a need to improve the tightness of the bushing at the termination of the power cable. In particular, in the case of a gas-terminated connection part or an oil-terminated connection part, it is necessary to ensure hermeticity such as airtightness or watertightness so that the insulating medium does not enter the bushing through the withdrawal opening of the bushing. is important. Further, in recent years, in order to make the power equipment compact, there is a demand for miniaturization of the terminal connection portion installed in the equipment case.

  In order to improve the tightness of the bushing, the upper metal fitting is made thicker, and the contact length between the insertion hole formed in the upper metal fitting and the conductor lead-out rod is lengthened, so that the distance between the conductor draw-out rod and the upper metal fitting is increased. It is possible to secure the sealing property. However, in this case, the thickness of the upper fitting becomes thicker, so that the pulling out length from the end face of the pulling out opening of the bushing to the tip of the conductor pulling rod becomes longer. Therefore, it is difficult to reduce the size of the terminal connection portion, and it is difficult to meet the demand for downsizing of power devices.

  Therefore, it is an object of the present invention to provide a connecting portion of a power cable that can improve the hermeticity of the bushing and reduce the size thereof. It is another object to provide a power cable line including the above-mentioned power cable connecting portion.

The terminal connection portion of the power cable according to the present disclosure is
A cable end exposed by stripping a conductor and a cable insulator formed on the outer periphery of the conductor,
A conductor withdrawal rod connected to the exposed conductor;
A bushing for accommodating the cable end portion, the bushing having an extraction opening through which the conductor extraction rod is extracted,
An insertion hole is formed through which the conductor lead-out rod is inserted, and a body portion fixed to the lead-out opening portion and a conductor lead-out rod that extends from the body portion toward the inside of the bushing are inserted. An upper metal fitting having a tubular portion,
A first lead-out portion seal structure for sealing between the conductor lead-out rod and the tubular portion.

  The power cable track|line which concerns on this indication is provided with the terminal connection part of the power cable which concerns on this indication.

  The terminal connection portion of the power cable can improve the hermeticity of the bushing and reduce the size thereof. The power cable line can be made compact while ensuring the hermeticity of the bushing at the terminal connection portion of the power cable.

FIG. 3 is a schematic partial vertical cross-sectional view showing a terminal connecting portion of the power cable according to the first embodiment. It is a principal part expanded sectional view which expands and shows the part enclosed with the II line of FIG.

[Description of Embodiments of the Present Invention]
First, embodiments of the present invention will be listed and described.

(1) The terminal connecting portion of the power cable according to one aspect of the present invention is
A cable end exposed by stripping a conductor and a cable insulator formed on the outer periphery of the conductor,
A conductor withdrawal rod connected to the exposed conductor;
A bushing for accommodating the cable end portion, the bushing having an extraction opening through which the conductor extraction rod is extracted,
An insertion hole is formed through which the conductor lead-out rod is inserted, and a body portion fixed to the lead-out opening portion and a conductor lead-out rod that extends from the body portion toward the inside of the bushing are inserted. An upper metal fitting having a tubular portion,
A first lead-out portion sealing structure for sealing between the conductor lead-out rod and the tubular portion.

  The terminal connection part of the power cable has a structure in which the upper metal fitting has a cylindrical part extending toward the inside of the bushing, and seals between the conductor drawing rod and the cylindrical part by the first drawing part sealing structure. is there. Thus, by inserting the conductor lead-out rod into the tubular portion, the contact length with the conductor lead-out rod can be secured, and the first lead-out portion sealing structure is provided between the conductor lead-out rod and the tubular portion. By being provided, the sealability between the conductor pull-out rod and the upper fitting can be enhanced. In addition, since the tubular portion is located in the internal space of the pulling opening of the bushing, the end connecting portion is ensured while ensuring the sealing property between the conductor pulling rod and the upper fitting without increasing the pulling out length of the conductor pulling rod. Can be made smaller. Therefore, the terminal connection portion of the power cable can improve the hermeticity of the bushing and can be downsized, and can be preferably used particularly for the gas terminal connection portion.

  In the terminal connection portion of the power cable, the inner diameter of the lead-out opening is larger than the outer diameter of the conductor lead-out rod. Therefore, after connecting the conductor draw-out rod to the conductor at the cable end, when inserting the cable end into the bushing and pulling out the conductor draw-out rod from the draw-out opening, you can easily pull out the conductor draw-out rod. Excellent in performance.

  (2) One form of the terminal connecting portion of the power cable is that a gap is provided between the extraction opening and the tubular portion.

  When a conductor lead-out rod is pulled out from the lead-out opening and then the conductor lead-out rod is inserted into the barrel and the upper fitting is attached to the lead-out opening, a gap is provided between the lead-out opening and the barrel. In addition, the tubular portion can be easily inserted into the pull-out opening portion, and the upper fitting can be easily attached.

  (3) As one form of the terminal connecting portion of the power cable, in the first lead-out portion seal structure, an annular seal groove is formed on an outer peripheral surface of the conductor lead-out rod, and an annular seal member is formed in the seal groove. It may be arranged structure.

  In the first lead-out portion sealing structure, since the seal groove is formed on the outer peripheral surface of the conductor lead-out rod and the seal member is arranged, when the seal groove is formed on the inner peripheral surface of the tubular portion and the seal member is arranged, In comparison, it is easy to arrange the seal member and easily form the seal structure.

  (4) As one form of the terminal connecting portion of the power cable, an inclined surface whose inner diameter increases toward the tip is formed at the tip of the tubular portion.

  Since the inclined surface is formed at the tip of the tubular portion, the tip of the conductor withdrawing rod can be guided into the tubular portion by the inclined surface when the conductor withdrawing rod is inserted into the tubular portion. Easy to insert into the insertion hole of the upper fitting. Further, when the seal member is arranged on the outer peripheral surface of the conductor lead-out rod, the seal member is easily pushed into the tubular portion by the inclined surface when the conductor lead-out rod is inserted into the tubular portion.

  (5) One form of the terminal connection portion of the power cable according to (4) is that the tubular portion is formed so that the thickness thereof decreases toward the tip.

  Since the tubular portion is formed so that the thickness thereof decreases toward the tip, it is possible to prevent the outer diameter of the tip portion of the tubular portion from increasing.

  (6) As one form of the terminal connecting portion of the power cable, it is possible to provide a second lead portion sealing structure for sealing between the conductor lead rod and the body portion.

  Since the second lead-out portion sealing structure is provided between the conductor lead-out rod and the main body, the sealability between the conductor lead-out rod and the upper fitting can be further enhanced, and the bushing can be more tightly sealed. improves.

  (7) As one form of the terminal connecting portion of the power cable, an opening seal structure for sealing between the extraction opening and the main body may be provided.

  Since the opening seal structure is provided between the drawing opening and the main body, the sealability between the bushing and the upper fitting can be further enhanced, and the hermeticity of the bushing is further enhanced.

  (8) A power cable line according to an aspect of the present invention includes the power cable terminating connection portion according to any one of (1) to (7).

  Since the power cable line is provided with the terminal connecting portion of the power cable, it is possible to realize miniaturization while ensuring the sealing property of the bushing at the connecting portion.

[Details of the embodiment of the present invention]
A specific example of the terminal connecting portion of the power cable according to the embodiment of the present invention will be described below with reference to the drawings. The same reference numerals in the drawings indicate the same names. It should be noted that the present invention is not limited to these exemplifications, and is shown by the scope of the claims, and is intended to include meanings equivalent to the scope of the claims and all modifications within the scope.

[Embodiment 1]
<Terminal connection part of power cable>
The terminating connection portion of the power cable according to the first embodiment will be described with reference to FIGS. As shown in FIGS. 1 and 2, the terminal connection portion 1 includes a cable end portion 10 in which the conductor 11 is exposed, a conductor lead-out rod 20 connected to the conductor 11, and a bushing 30 for housing the cable end portion 10. , An upper metal fitting 40 attached to the drawing opening 31 of the bushing 30. As shown in FIG. 2, one of the features of the terminal connection portion 1 is that the upper metal fitting 40 has a tubular portion 42 that extends toward the inside of the bushing 30. The first lead-out portion seal structure 51 is provided between them. Here, the terminal connection part 1 according to the first embodiment is a gas terminal connection part for connecting the power cable 100 to a power device (not shown) such as GIS, and the bushing 30 is provided in a device case (not shown). It is installed. Hereinafter, the configuration of the terminal connection portion 1 will be described in detail. In the following description, the side of the pulling opening 31 of the bushing 30 from which the conductor pulling rod 20 is pulled out is the upper side, and the opposite side is the lower side.

<Power cable>
First, the configuration of the power cable 100 shown in FIG. 1 will be described. The power cable 100 includes a conductor 11 and a cable insulator 12 formed on the outer periphery of the conductor 11, and is covered with a sheath 14. The power cable 100 is a rubber/plastic insulated power cable, here a CV cable. An inner semiconductive layer (not shown) is provided on the inner peripheral portion of the cable insulator 12, and an outer semiconductive layer 13 is provided on the outer peripheral portion thereof. The ends of the power cable 100 are end processed.

(Cable end)
As shown in FIG. 1, the cable end portion 10 is stepped off by an end treatment so that the conductor 11, the cable insulator 12, and the outer semiconductive layer 13 are exposed, and the conductor 11 is attached to the tip (upper end) of the conductor 11. The pull-out rod 20 is compression-connected.

(Conductor withdrawal bar)
As shown in FIG. 1, the conductor lead-out rod 20 is connected to the exposed conductor 11 and is drawn out from the lead-out opening 31 of the bushing 30. A lead conductor (not shown) of a power device is connected to the tip end (upper end) of the conductor lead-out rod 20 pulled out from the bushing 30, and the lead conductor and the conductor 11 are electrically connected via the conductor lead-out rod 20. Connected to.

(Bushing)
As shown in FIG. 1, the bushing 30 accommodates the cable end portion 10, has a pull-out opening portion 31 through which the conductor pull-out rod 20 is pulled out at one end side (upper side) thereof, and the cable end portion at the other end side (lower side) thereof. It has an insertion opening 32 into which the end 10 is inserted. The bushing 30 is a tubular member made of an insulating material, and is an epoxy porcelain tube here. The inner diameter of the lead-out opening 31 is larger than the outer diameter of the conductor lead-out rod 20.

  An upper metal fitting 40 having an insertion hole 40h (see FIG. 2) through which the conductor lead-out rod 20 is inserted is attached to the end surface of the lead-out opening 31, and is sealed by the upper metal fitting 40. The insertion opening 32 is provided with a flange portion 32f, and an adapter 70 for fixing to the bottom plate 200 of the device case is attached to an end surface of the flange portion 32f. A cable protection metal fitting 71 is attached to the adapter 70 so as to cover the vicinity of the start of the end treatment of the cable end portion 10 (the vicinity of the start position of the portion subjected to the end treatment).

(Upper bracket)
As shown in FIG. 2, the upper fitting 40 has a main body 41 fixed to the end face of the drawing opening 31, and a cylindrical shape extending from the lower surface of the main body 41 toward the inside (downward) of the bushing 30. The conductor lead-out rod 20 is inserted into the tubular portion 42. The insertion hole 40h is formed in the center of the main body portion 41 and communicates with the tubular portion 42. The main body 41 is fixed to the drawer opening 31 with a bolt. The tubular portion 42 is located in the internal space of the drawer opening portion 31, the outer diameter of the tubular portion 42 is smaller than the inner diameter of the drawer opening portion 31, and a gap is provided between the drawer opening portion 31 and the tubular portion 42. ing.

  In this example, as shown in FIG. 2, an inclined surface 42i whose inner diameter increases toward the tip is formed at the tip (lower end) of the tube 42, and the tube 42 has a thickness toward the tip. Is formed to be thin. The inclined surface 42i is continuous with the inner peripheral surface (insertion hole 40h) of the tubular portion 42. Here, the slanted surface 42i is formed by the thickness of the tubular portion 42 decreasing toward the tip. However, the tip of the tubular portion 42 is formed in a truncated cone shape so that the diameter thereof increases toward the tip. It may have been done.

(Drawer seal structure)
The terminal connecting portion 1 is provided with a lead-out portion seal structure that seals between the conductor lead-out rod 20 and the upper metal fitting 40. In this example, as the lead-out portion seal structure, as shown in FIG. A structure 51 and a second drawer seal structure 52 are further provided.

(First drawing portion seal structure)
As shown in FIG. 2, the first lead-out portion sealing structure 51 is provided between the conductor lead-out rod 20 and the tubular portion 42, and seals between the conductor lead-out rod 20 and the tubular portion 42. The first lead-out portion seal structure 51 here is a structure in which an annular seal groove 51g is formed on the outer peripheral surface of the conductor lead-out rod 20, and an annular seal member 51s is arranged in the seal groove 51g. The first lead-out portion seal structure 51 has two seal grooves 51g formed on the outer peripheral surface of the conductor lead-out rod 20 at intervals in the axial direction, and seal members 51s are arranged in the respective seal grooves 51g to form a double structure. It may be a seal structure. An O-ring is used for the seal member 51s. The seal member 51s is pushed into the tubular portion 42 and comes into close contact with the outer peripheral surface (the seal groove 51g) of the conductor pulling rod 20 and the inner peripheral surface of the tubular portion 42.

(Second drawing portion seal structure)
As shown in FIG. 2, the second lead-out portion sealing structure 52 is provided between the conductor lead-out rod 20 and the body portion 41, and seals between the conductor lead-out rod 20 and the body portion 41. In the second lead-out portion seal structure 52, the peripheral portion of the insertion hole 40h on the upper surface of the main body portion 41 is cut out in an annular shape to form a seal step 52t, and the second lead-out portion seal structure 52 is attached to the outer peripheral surface of the conductor lead-out rod 20. The ring-shaped seal member 52s is arranged in the seal step 52t. An O-ring is used for the seal member 52s. The seal member 52s is in close contact with the outer peripheral surface of the conductor extraction rod 20 and the inner peripheral surface of the seal step 52t.

(Opening seal structure)
Further, in this example, as shown in FIG. 2, an opening seal provided between the drawer opening 31 and the upper fitting 40 (main body 41) to seal between the drawer opening 31 and the main body 41. A structure 53 is provided. In the opening seal structure 53 here, an annular seal groove 53g is formed in a peripheral edge portion of the lower surface of the main body portion 41 which is in contact with the end surface of the drawer opening portion 31, and an annular seal member 53s is arranged in the seal groove 53g. It has a different structure. In this example, two seal grooves 53g are formed on the lower surface of the main body portion 41 at intervals in the radial direction, and seal members 53s are arranged in the respective seal grooves 53g to form a double seal structure. .. The opening seal structure 53 may be a single seal structure. An O-ring is used for the seal member 53s. The seal member 53s is in close contact with the lower surface (the seal groove 53g) of the main body 41 and the end surface of the extraction opening 31.

  Other configurations of the terminal connection portion 1 will be described below.

(Tightening bracket)
As shown in FIG. 2, on the upper side of the upper metal fitting 40, a tightening metal fitting 45 having an insertion hole 45h through which the conductor lead-out rod 20 is inserted is attached. The tightening fitting 45 is fixed to the upper surface of the upper fitting 40 (main body 41) by bolting. In addition, the lower surface of the fastening member 45 has an annular protrusion 45p that protrudes downward along the insertion hole 45h. The protrusion 45p is fitted into the seal step 52t formed on the main body 41, and brings the seal member 52s into close contact with the outer peripheral surface of the conductor withdrawing rod 20 and the inner peripheral surface of the seal step 52t.

(Conductor fixing bracket/Lock nut)
As shown in FIG. 2, a conductor fixing fitting 60 and a lock nut 65 for fixing the conductor pull-out rod 20 to the bushing 30 are attached to the upper side of the fastening fitting 45. On the outer peripheral surface of the conductor pull-out rod 20 closer to the tip than the tightening fitting 45, male threaded screw portions 21 and 22 are formed side by side in the axial direction. The screw portion 21 and the screw portion 22 have different screw pitches, and the outer diameter of the screw portion 21 is larger than the outer diameter of the screw portion 22. Further, the conductor fixing metal fitting 60 and the lock nut 65 are respectively formed with a screw hole 60h in which a female screw to be screwed with the screw portion 21 is formed and a screw hole 65h in which a female screw to be screwed with the screw portion 22 is formed. ing. The conductor fixing member 60 is fixed to the upper surface of the tightening member 45 with a bolt, and the lock nut 65 is fixed to the upper surface of the conductor fixing member 60 with a bolt. The conductor fixing metal fitting 60 is screwed to the screw portion 21 of the conductor drawing rod 20, and the lock nut 65 is tightened to the screw portion 22, whereby the conductor fixing metal fitting 60 is fixed to the conductor drawing rod 20, and the tightening metal fitting 45 and The conductor pull-out rod 20 is fixed to the bushing 30 via the upper fitting 40.

(Pre-molded insulator)
As shown in FIG. 1, a premolded insulator 80 is attached to the outer periphery of the cable insulator 12 at the cable end 10. The pre-molded insulator 80 is a member that relieves the electric field at the cable end 10 inside the bushing 30, and is made of rubber such as ethylene propylene rubber or silicone rubber. The shape of the premolded insulator 80 is formed in a cylindrical shape with one end side (upper side) being tapered, and a circular hole into which the cable insulator 12 is inserted is formed in the center thereof.

(Push pipes and metal fittings)
Further, the premolded insulator 80 is pushed into the bushing 30 by the push pipe 85 provided on the insertion opening 32 side of the bushing 30. On the inner peripheral surface of the bushing 30, a taper surface 32t for stopping one end side of the premolded insulator 80 is formed. The push pipe 85 is biased by a push fitting 86 having a spring, and pushes the premold insulator 80 into the bushing 30 to bring one end side of the premold insulator 80 into contact with the tapered surface 32t of the bushing 30. As a result, the premold insulator 80 is brought into close contact with the cable insulator 12 and the bushing 30, and a predetermined surface is formed on the interface between the premold insulator 80 and the cable insulator 12 and the interface between the premold insulator 80 and the bushing 30. Give pressure.

<Assembly method of terminal connection>
An example of an assembling method of the terminal connecting portion 1 according to the first embodiment described above will be described.

  As shown in FIG. 1, the end portion of the power cable 100 is stripped off to expose the conductor 11, the cable insulator 12, and the outer semiconductive layer 13, and the conductor extraction rod 20 is connected to the exposed conductor 11. A premolded insulator 80 is attached to the outer circumference of the cable insulator 12.

  The cable end 10 is inserted through the insertion opening 32 of the bushing 30 and accommodated in the bushing 30, and the conductor pull-out rod 20 is pulled out through the pull-out opening 31. Since the inner diameter of the lead-out opening 31 is larger than the outer diameter of the conductor lead-out rod 20, the conductor lead-out rod 20 can be pulled out easily.

  As shown in FIG. 2, the seal member 51s is arranged in the seal groove 51g of the conductor pull-out rod 20, and the seal member 53s is arranged in each seal groove 53g of the upper fitting 40 (main body 41). The upper metal fitting 40 is attached to the bushing 30 by inserting the conductor withdrawing rod 20 into the tubular portion 42 (insertion hole 40h) of the upper metal fitting 40 and fixing the body portion 41 to the end surface of the withdrawing opening 31. Since a gap is provided between the pullout opening 31 and the tubular portion 42, the tubular portion 42 can be easily inserted into the pullout opening 31. Since the inclined surface 42i is formed at the tip of the tubular portion 42, the tip of the conductor withdrawing rod 20 can be guided into the tubular portion 42 by the inclined surface, and the conductor withdrawing rod 20 is inserted into the insertion hole 40h. easy. Further, the inclined surface 42i facilitates pushing the seal member 51s into the tubular portion 42.

  After mounting the seal member 52s on the outer peripheral surface of the conductor pull-out rod 20 and arranging the seal member 52s in the seal step 52t of the main body portion 41, the conductor pull-out rod 20 is inserted into the insertion hole 45h of the tightening metal fitting 45 and the upper metal fitting 40 is inserted from above. The tightening fitting 45 is attached and fixed to the upper fitting 40.

  The screw portion 60h of the conductor fixing bracket 60 is screwed into the threaded portion 21 of the conductor pulling rod 20, the conductor fixing bracket 60 is screwed to the conductor pulling bar 20, and the conductor fixing bracket 60 is fixed to the fastening bracket 45. .. After that, the screw hole 65h of the lock nut 65 is screwed into the threaded portion 22 of the conductor pull-out rod 20, the lock nut 65 is tightened from the upper side of the conductor fixing metal fitting 60, and the lock nut 65 is fixed to the conductor fixing metal fitting 60.

  As shown in FIG. 1, an adapter 70 is attached to the flange portion 32f of the bushing 30 and fixed to the bottom plate 200 of the equipment case, whereby the bushing 30 from which the conductor pull-out rod 20 is pulled out is installed in the equipment case.

<Effect of termination connection>
The terminal connecting portion 1 according to the first embodiment described above has the tubular portion 42 in which the upper metal fitting 40 extends toward the inside of the bushing 30, and seals between the conductor lead-out rod 20 and the tubular portion 42. The drawing unit seal structure 51 is provided. Accordingly, the conductor lead-out rod 20 is inserted into the tubular portion 42, whereby the contact length between the upper metal fitting 40 and the conductor lead-out rod 20 can be secured, and the first lead-out rod 20 and the tubular portion 42 are provided with a contact length. By providing the first lead-out portion seal structure 51, the sealability between the conductor lead-out rod 20 and the upper fitting 40 can be enhanced. In addition, since the tubular portion 42 is located in the internal space of the lead-out opening 31, the sealability between the conductor lead-out rod 20 and the upper fitting 40 is ensured without increasing the lead-out length of the conductor lead-out rod 20. Can be miniaturized. Therefore, the terminal connecting portion 1 can improve the hermeticity of the bushing and reduce the size thereof. Further, the power cable line including the terminal connection portion 1 can be downsized while ensuring the tightness of the bushing in the terminal connection portion 1.

  Since the terminal connecting portion 1 further includes the second lead-out portion seal structure 52 between the conductor lead-out rod 20 and the main body portion 41 in addition to the first lead-out portion seal structure 51, the conductor lead-out rod 20 and the upper metal fitting 40 are provided. It is possible to further enhance the sealing property between the and. Further, by providing the opening seal structure 53 between the drawer opening 31 and the main body 41, the sealability between the bushing 30 and the upper fitting 40 can be further improved. Therefore, the tightness of the bushing is further improved.

  In the terminal connection portion 1, since the inclined surface 42i is formed at the tip portion (lower end portion) of the tubular portion 42 by decreasing the thickness toward the tip, the outer diameter of the tip portion of the tubular portion 42 is large. This can be avoided, and it is easy to secure a gap between the drawer opening 31 and the tubular portion 42.

<Use of termination connection>
In the terminating connection part 1 of the first embodiment, the case of the in-gas terminating connection part has been described as an example, but the terminating connection part 1 can also be suitably used as the in-oil terminating connection part or the in-air terminating connection part.

1 Termination Connection Part 100 Power Cable 10 Cable End Part 11 Conductor 12 Cable Insulator 13 External Semi-Conductive Layer 14 Sheath 20 Conductor Draw Bar 21 Screw Part 22 Screw Part 30 Bushing (Epoxy Insulator)
31 Drawout Opening 32 Insertion Opening 32f Flange 32t Tapered Surface 40 Upper Metal Fitting 40h Insertion Hole 41 Main Body 42 Tube 42i Sloping Surface 45 Tightening Fitting 45h Insertion Hole 45p Projection 51 First Drawout Seal Structure 51g Seal Groove 51s Seal member (O ring)
52 Second Draw Out Seal Structure 52t Seal Stage 52s Seal Member (O-Ring)
53 Opening seal structure 53g Seal groove 53s Seal member (O-ring)
60 Conductor fixing bracket 60h Screw hole 65 Lock nut 65h Screw hole 70 Adapter 71 Cable protection bracket 80 Pre-molded insulator 85 Push pipe 86 Push bracket 200 Bottom plate (equipment case)

Claims (8)

A cable end exposed by stripping a conductor and a cable insulator formed on the outer periphery of the conductor,
A conductor withdrawal rod connected to the exposed conductor;
A bushing for accommodating the cable end portion, the bushing having an extraction opening through which the conductor extraction rod is extracted,
An insertion hole is formed through which the conductor lead-out rod is inserted, and a body portion fixed to the lead-out opening portion and a conductor lead-out rod that extends from the body portion toward the inside of the bushing are inserted. An upper metal fitting having a tubular portion,
A first lead-out portion sealing structure for sealing between the conductor lead-out rod and the tubular portion, and a terminal connecting portion of the power cable.   The terminal connection portion of the power cable according to claim 1, wherein a gap is provided between the extraction opening portion and the tubular portion.   The said 1st drawing-out part sealing structure is a structure where the annular sealing groove is formed in the outer peripheral surface of the said conductor drawing rod, and the annular sealing member is arrange|positioned at the said sealing groove. Power cable termination connection.   The terminal connection part of the power cable according to any one of claims 1 to 3, wherein an inclined surface whose inner diameter increases toward the tip is formed at the tip of the tubular portion.   The terminal connection portion of the power cable according to claim 4, wherein the tubular portion is formed so that the thickness thereof decreases toward the tip.   The terminal connecting portion of the power cable according to claim 1, further comprising a second lead portion sealing structure that seals between the conductor lead rod and the main body portion.   The terminating connection portion of the power cable according to claim 1, further comprising an opening seal structure that seals between the extraction opening and the main body.   A power cable line comprising the terminating connection portion of the power cable according to claim 1.

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