JP4621707B2 - Insulation tube unit for air termination connection - Google Patents

Description

  The present invention relates to a power cable termination connection part for connecting a power device or an overhead power transmission line and a power cable arranged in a power plant, a substation, etc., and particularly for an air termination connection part and an air termination connection part. Regarding the tube unit.

  In general, a power cable such as a CV (crosslinked polyethylene insulation) cable is provided with a shielding layer (external semiconductive layer) on the insulator in order to reduce electric field stress in the insulator. When assembling such a terminal connection portion of a power cable, simply removing the shielding layer at the end of the cable may concentrate the electric field at the end of the shielding layer and cause destruction of the crosslinked polyethylene as an insulator. For this reason, various measures are taken so that electric field stress is not concentrated particularly at the terminal connection portion of the high-voltage power cable.

  As various contrivances, for example, an air termination connection portion as a termination connection portion used in the atmosphere is a prefabricated type using a pre-molded rubber stress cone (electric field relaxation insulating reinforcing layer) (see Patent Document 1). ), And an oil immersion type (see Patent Document 2) using a capacitor cone in which the capacitance between thin metal foil electrodes arranged in oil immersion insulating paper is appropriately distributed.

  For example, in a prefabricated aerial termination connection section, a conductor lead bar is compression-connected to the end of a power cable conductor in a cylindrical insulator tube, and a spindle-shaped stress cone is formed on the exposed insulator after stripping. Is fitted.

  The stress cone is pressed and fixed to an epoxy seat that is inserted and fixed below the inside of the garment tube through a compression device. In addition, an appropriate pressure is applied to the interface between the epoxy seat and the stress cone and the interface between the stress cone and the cable insulator by the spring force of the compression device to ensure the dielectric strength. Further, a conductor lead bar and an upper metal fitting for fixing the insulator pipe are fixed to the upper part of the insulator pipe, and these are covered with an upper cover. Moreover, in the power cable, the outer shielding layer is grounded in the insulator pipe.

The insulating pipe is filled with an insulating fluid such as insulating oil or an insulating gas such as SF ₆ gas (sulfur hexafluoride) as an insulating compound.

  In addition, in the oil-immersed air termination connection part, a condenser cone is used as the main insulation element at the conductor end of the power cable inserted into the insulation pipe, and an insulation fluid such as insulation oil is introduced into the insulation pipe as an insulation compound. Filled.

  In such a prefabricated type or oil-immersed type air termination connection part, the garment pipe that accommodates the connection part between the cable conductor of the end of the power cable and the conductor lead bar is generally made of porcelain, As the voltage increases, there is a problem that the length becomes longer and the weight becomes heavier and difficult to handle.

  Moreover, in the air termination | terminus connection part of the said structure, the insulating compound of a liquid or a gas is filled in the insulator pipe. For this reason, maintenance to prevent the insulation compound from flowing out due to external loads such as earthquakes and aging has become necessary and troublesome.

On the other hand, in recent years, there has been known a composite insulator tube in which a polymer insulator tube is used instead of a porcelain insulator tube, and this polymer insulator tube is filled with insulating oil or insulating gas.
JP 2000-261948 A JP 2003-189454 A

  However, when a polymer insulator pipe is used instead of a porcelain insulator pipe in the conventional air termination connection portion, the insulator pipe is formed of a polymer material, so that the polymer insulator pipe is externally inserted. There is a possibility that moisture permeates and mixes with the insulating oil or insulating gas in the garment tube, thereby degrading the performance of the insulating oil or insulating gas.

  In addition, with conventional air termination connections, as the operating voltage increases, the diameter of the insulating part due to insulating fluid, etc. is increased, and the length and width of the insulation pipe are also increased to ensure the surface leakage distance. In recent years, it has been desired to reduce the size and length of the air termination connection so that it can be arranged in a narrow space.

  The present invention has been made in view of such points, and it is easy to handle, suitable for use in an air termination connection portion of a high-voltage power cable, and an air termination connection portion can be easily assembled. It is an object of the present invention to provide an air end connecting part irrigation pipe unit and an air end connecting part that can be made compact.

The air terminal connector for the air termination connecting portion of the present invention has a cylindrical shape, and a power cable terminal is inserted from one end side, and a number of flanges projecting radially are spaced apart in the longitudinal direction on the outer periphery. A formed polymer insulator tube, a receiving portion disposed inside one end portion of the polymer insulator tube and receiving the power cable terminal in a conductive state, and the polymer insulator tube disposed on an axis of the insulator tube; The polymer insulator is formed using a material corresponding to the kind of the insulating mixture that forms the conductor tube and the insulating cylinder portion provided in the polymer insulation tube , and is joined to the receiving portion on one end side in a conductive state. An electric field at a connection portion between the receiving portion and the receiving portion and the conductor extraction rod is disposed on one end side in the tube so as to surround a periphery of the receiving portion and a connection portion between the receiving portion and the conductor extraction rod. The In the state where the electric field relaxation tube is disposed in the polymer insulation tube and the polymer insulation tube, the insulating material is filled between the polymer insulation tube, the conductor lead bar and the receiving portion and solidified. Cover the outer periphery of the cylindrical insulating tube portion arranged by this and the end portion of the conductor lead bar arranged coaxially and the connection portion of the receiving portion with a conductive cylindrical connection portion, or pull out the conductor A flexible conductor (flexible stranded wire) and a short cable are arranged in the middle of the connecting portion of the rod and the receiving portion and the conductor drawing rod, and the conductor drawing rod and the receiving portion in the polymer insulation pipe are connected to the polymer. A flexible energizing portion that energizes the tube while following the arrangement of the insulator tube, and the polymer insulator tube is disposed in the longitudinal direction on the cylindrical main body portion made of epoxy resin or FRP and on the outer peripheral portion of the main body portion. Silicon resin having a plurality of ribs Comprising an insulating jacket section, the insulating tubular portion takes the insulating outer filled with the parts and the same type silicone resin obtained by solidifying configuration.

The insulator tube unit for air termination connection portion of the present invention is a gel-like resin formed by solidifying the silicon resin of the insulating tube portion.

  Moreover, the air termination | terminus connection part of this invention takes the structure by which an electric power cable terminal is mounted | worn with the said receiving part of the insulator pipe unit for air termination | terminus connection parts of the said structure.

  In the above-mentioned insulator tube unit for the air termination connecting portion, the polymer insulator tube is provided with an electric field relaxation tube surrounding the receiving portion and the connecting portion between the receiving portion and the conductor lead bar on one end side of the polymer insulating tube. The end portion of the power cable received by the portion is received and connected in a state surrounded by the electric field relaxation tube. In this way, after filling the polymer insulator tube with an insulating material and forming an insulator in the polymer insulator tube, when connecting the power cable and using it as an air termination connection part, in the connection part at the end of the power cable The electric field is relaxed, and the electric field on the outer peripheral surface of the polymer insulation tube can be relaxed.

  In other words, even when connected to the end of an ultra-high voltage power cable to which a higher voltage is applied, the diameter of the insulating cylinder does not increase, and the polymer insulation pipe does not need to extend the surface leakage distance. This can be achieved without increasing the overall length of the polymer insulator tube itself. In other words, even when used in the air termination connection part of a higher voltage ultra-high voltage cable, it can be used as a lighter and more compact unit without significantly increasing the size of the insulating cylinder part and polymer insulation pipe. It is easy to handle, and the assembling work of the air end connection part can be easily performed. In this case, the cost of the unit itself can be reduced.

  ADVANTAGE OF THE INVENTION According to this invention, it is easy to handle using it for the air termination | terminus connection part of a high voltage electric power cable, and while being able to assemble an air termination | terminus connection part easily, compactization can be achieved.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Here, the air end connection part is for connecting the end part of the power cable to, for example, a transformer, an overhead line, a bus of a substation, and the like.

  FIG. 1 is a cross-sectional view showing a configuration of an air end connection portion garment pipe unit 100 according to an embodiment of the present invention.

  1 includes a tapered pipe 110, a conductor extraction rod 120 disposed on the axis of the pipe 110 in the pipe 110, and a pipe. 110, a receiving portion 130 that receives the power cable end portion and is connected to the conductor lead rod 120, and an electric field relaxation tube 135 that is disposed inside the one end portion side of the insulating tube 110. In the present embodiment, the insulating tube portion 140 that covers the conductor lead bar 120 and the receiving portion 130 is provided in the insulating tube 110 by solidifying the filled insulating material.

  The garment tube 110 is configured by covering a cylindrical body portion 112 with a polymer coating material 114. Since the insulating tube 110 is tapered on the outer peripheral surface from the proximal end side toward the distal end side, the opening on the proximal end portion 110a side has a larger diameter than the opening on the distal end portion 110b side. Yes. In addition, the insulating pipe 110 of the present embodiment is assumed to have a tapered outer peripheral surface. However, the present invention is not limited to this, and the opening on the proximal end side and the distal end side has the same diameter. It may be.

  In the garment tube 110, the opening on the distal end portion 110b side is closed by an upper covering portion 116 connected to an overhead wire or equipment.

  In the case of the insulator tube 110, the end of the power cable is inserted into the insulator tube 110 from the base end portion 110a side and subjected to insulation treatment, and the upper portion on the tip end portion 110b side through the conductor lead bar 120. It is electrically connected to an overhead wire or equipment connected to the covering portion side.

  The main body 112 is made of a material having high mechanical strength, for example, a hard plastic resin such as an epoxy resin or FRP (Fiber Reinforced Plastics). Here, FRP is used, and the sheath of the garment tube 110 is formed by covering the cylindrical main body 112 made of FRP with the polymer coating material 114.

  The polymer coating material (insulation jacket portion) 114 is formed of a material having excellent electrical insulation performance, here, a polymer material such as silicon polymer, and is provided integrally with the main body portion 112.

  Further, the polymer coating material 114 has a plurality of flange portions 114a arranged at predetermined intervals in the longitudinal direction on the outer peripheral portion of the main body portion 112, and the proximal end portion ( This prevents the one end portion 110a side and the tip end (other end portion) 110b side from being electrically short-circuited by rainwater or the like.

  The conductor extraction rod 120 is a cylindrical body having conductivity, and is electrically connected to the upper covering portion 116 at one end portion 122 and is electrically connected to the receiving portion 130 through the flexible energizing portion 150 at the other end portion 124. Connected in a state. In addition, in this Embodiment, although the conductor extraction rod 120 was made into the cylindrical body which has electroconductivity, you may comprise not only this but a solid rod-shaped body.

  The conductor lead bar 120 may be configured in any manner as long as it has conductivity, and may be formed of a stranded wire or the like, but here, an aluminum tube is used. Since the conductor extraction rod 120 is cylindrical, the diameter can be increased in a state where the current carrying capacity is larger than that of the cable conductor.

  The receiving portion 130 is disposed on the proximal end portion 110a side in the garment tube 110, and is fixed to a flat plate-shaped bottom metal fitting 118 attached to the opening edge portion 110c of the basal end portion 110a of the garment tube 110. The end of the power cable is received by the receiving port 130a that opens outward from the opening of the metal fitting 118.

  Specifically, the receiving portion 130 has a cylindrical receiving portion main body 132 having insulation properties, and a bottomed cylindrical in-cylinder conducting portion 134 disposed in the receiving portion main body 132, and receives a power cable. By connecting to the in-cylinder conducting portion 134, the conductor drawing rod 120 is conducted.

  The receiving portion main body 132 is formed from an insulating member such as an epoxy resin, and the receiving port 130a is formed by an opening on one end side. With the receiving port 130 a communicating with the opening 118 a of the bottom metal part 118, the receiving part 130 is fixed to the bottom metal part 118.

  The end portion of the power cable is inserted from the base end portion 110a side of the insulator tube 110 through the opening 118a and the receiving port 130a of the bottom metal fitting 118, and the end portion of the inserted power cable is connected to the in-cylinder conductive portion 134. Is electrically connected to the connecting portion 134a.

  In the receiving portion main body 132, a convex portion 134 b provided on the bottom surface of the in-cylinder conductive portion 134 in the receiving portion main body 132 protrudes outward from the other end side end face. The convex portion 134 b is located coaxially with the air end connection portion garment pipe unit 100 and is connected to the flexible energization portion 150 in a conductive state. The outer diameter of the convex portion 134b is substantially the same as the outer diameter of the conductor lead bar 120.

  FIG. 2 is a schematic diagram showing an example of the flexible energization unit 150 of the air end connection portion garment pipe unit 100 according to the embodiment of the present invention, and FIG. FIG. 2B is a front view of a conductive cylindrical connecting portion of the flexible energizing portion 150. FIG.

  As shown in FIG. 2, the flexible energizing section 150 energizes the conductor lead bar 120 and the receiving section 130 in a state of following the arrangement of the garment tube 110, and both of them are flexible. Are connected.

  Here, the flexible energizing portion 150 connects the other end portion 124 of the conductor pull-out rod 120 and the convex portion 134b of the receiving portion 130 that are arranged in a state of being abutted on the same axis. As shown in FIG. 2A, the other end portion 124 of the conductor lead bar 120 is provided with a flange 126 whose end surface is curved, and a similar flange 136 is also provided on the front end surface of the convex portion 134b. Yes.

  That is, the conductor lead-out rod 120 and the receiving portion 130 are in contact with the flange 126 at the end surface of the other end portion 124 of the conductor lead-out rod 120 and the flange 136 at the tip of the convex portion 134b of the in-cylinder conductive portion 134. Arranged in a state.

  The flexible energizing portion 150 has a conductive cylindrical connecting portion 152 that covers the outer periphery of the other end portion 124 and the convex portion 134b of the conductor lead bar 120 arranged on the same axis. The inner peripheral surface is brought into surface contact with the respective outer peripheral surfaces to make them conductive.

  As shown in FIG. 2B, the conductive cylindrical connecting portion 152 includes a plurality of divided bodies 152a having a circular arc cross section obtained by dividing the cylindrical body into a plurality of pieces along the axial direction.

  Protrusions 152b projecting from both end portions of the divided body 152a that are spaced apart from each other in the axial direction are formed on the inner surface of each of the divided bodies 152a.

  The plurality of divided bodies 152a configured as described above are disposed at the connecting portion between the other end portion 124 of the conductor lead bar 120 and the convex portion 134b so as to straddle both flange portions 126 and 136, and both flange portions 126 and 136 are arranged in a U-shape. Thereby, the movement to the axial direction of the cylindrical conduction | electrical_connection cylindrical connection part 152 which consists of the division body 152a is controlled. In addition, the internal diameter of the cylindrical body which consists of several division body 152a is a thing smaller than the outer diameter of the other end part 124 and the convex part 134b to be connected.

  The conductive cylindrical connecting portion 152 arranged in this way is pressed against the outer peripheral surface of the other end portion 124 of the conductor lead bar 120 and the convex portion 134b by the pressing member 154 arranged on the outer peripheral side, and the outer peripheral surface and the surface. In contact.

  The pressing member 154 makes the two conductive and presses the inner peripheral surface of the conductive cylindrical connecting portion 152 against the outer peripheral surface of the other end portion 124 and the convex portion 134b of the conductor pull-out rod 120 and connects them. This prevents the conductive cylindrical connecting portion 152 from being displaced from the portion.

  Here, the pressing member 154 is configured by a plurality of annular coil springs arranged along the outer periphery of the conductive cylindrical connecting portion 152. Here, the coil spring is arranged in a state in which it is fitted in a groove 152c formed along the outer periphery on the outer peripheral surface of the conductive cylindrical connecting portion 152 so as not to drop off from the outer peripheral surface of the conductive cylindrical connecting portion 152. Has been. Specifically, the groove 152c is formed at the same position on the outer peripheral surface of each of the plurality of divided bodies 152a.

  Further, in the flexible energizing portion 150, the conductive cylindrical connecting portion 152 and the pressing member 154 that cover the outer periphery of the other end portion 124 and the convex portion 134b of the conductor lead bar 120 arranged on the same axis are connected by the heat shrinkable tube 156. It is covered. The heat shrinkable tube 156 can prevent the resin from entering the flexible energizing portion 150 when the insulating tube portion 140 is formed by filling the insulating tube 110 with the resin.

  On the inner circumference of the upper and lower openings of the heat-shrinkable tube 156, O-rings 158 that are externally fitted to the conductor lead bar 120 and the convex portion 134b are disposed. Here, the O-ring 158 is embedded in the heat-shrinkable tube 156, and the connection portion between the other end portion 124 of the conductor lead bar 120 and the convex portion 134b of the receiving portion 130 is formed by the heat-shrinkable tube 156 and the O-ring 158. It is in a sealed state. In addition, it is good also as a structure of the flexible electricity supply part 150 which does not have this O-ring 158. In this case, the connection portion between the other end portion 124 of the conductor lead bar 120 and the convex portion 134 b of the receiving portion 130 is sealed by the heat shrinkable tube 156.

  Note that the flexible energization unit 150 is not limited to the above configuration, and any configuration can be used as long as the conductor lead bar 120 and the receiving unit 130 connected to the cable end can follow the arrangement even when the polymer insulator tube 110 is used. Good. For example, a flexible conductor (flexible stranded wire), a short cable, or the like may be disposed in the connection portion between the conductor lead rod 120 and the receiving portion 130 or in the middle of the conductor lead rod 120.

  By the flexible energizing portion 150 configured as described above, the conductor lead bar 120 and the receiving portion 130 are connected to each other so as to be bent in a conductive state.

  An electric field relaxation tube 135 surrounds the connecting portion and the receiving portion 130 from the side at the connection portion of the conductor lead bar 120 and the receiving portion 130 connected by the flexible energizing portion 150 and the outer periphery of the receiving portion 130. It is arranged.

  The electric field relaxation tube 135 relaxes the electric field at the receiving portion 130 and the connecting portion between the receiving portion 130 and the conductor lead bar 120.

  The electric field relaxation tube 135 is formed using a material corresponding to the type of insulating mixture that forms the insulating cylindrical portion 140 provided in the polymer insulating tube 110. When the insulating cylinder part 140 is formed of silicone, zinc oxide powder is filled with silicone as a binder and formed of ZnO. In addition, the electric field relaxation tube 135 is formed using a high dielectric constant material, and for example, is formed so as to have a high dielectric constant of 10 or more, such as rubber filled with a conductive filler such as carbon black. .

  In the present embodiment, the electric field relaxation tube 135 is fixed to the polymer insulating tube 110 with its outer peripheral surface being in close contact with the inner peripheral wall on one end side of the polymer insulating tube 110. In the embodiment, the electric field relaxation tube 135 is configured to be attached to the inner peripheral surface on the one end portion side of the polymer insulator tube 110. However, the present invention is not limited to this, and the receiving portion 130, the receiving portion 130, and the conductor extraction rod are used. As long as it is arranged around the connecting portion with 120 so as to surround them, the polymer insulating tube 110 may be arranged in any manner.

  On the inner peripheral surface of the polymer insulation tube 110, a polymer coating that is an outer sheath of the insulation tube 110 is provided between the inner peripheral surface of the electric field relaxation tube 135 and the inner peripheral surface other than the portion to which the electric field relaxation tube 135 is attached. An insulating cylinder portion 140 is provided which is filled with an insulating material of the same type as the material 114 and solidified.

  The insulating cylinder part 140 is formed of a resin having the same insulating property as the polymer coating material 114 constituting the insulating jacket part of the insulating tube 110, and the inner peripheral surface is the outer peripheral surface of the conductor lead bar 120 and the receiving part 130. The outer peripheral surface is in close contact with the inner peripheral surface of the tube 110 and the inner peripheral surface of the electric field relaxation tube 135.

  Here, the insulating cylindrical portion 140 is formed of silicone, which is a resin having the same insulating property as the polymer covering material 114 that constitutes the insulating jacket portion of the garment tube 110. The insulating tube 140 may be made of any material as long as it is the same material as the material used in the insulating jacket portion (polymer coating material 114) of the stub tube 110. Further, the resin forming the insulating cylinder portion 140 includes a gelled resin formed by solidification.

  Specifically, the insulating cylindrical portion 140 is preferably formed of a low temperature curable rubber or a normal temperature curable rubber such as silicone rubber, but may be formed using a soft epoxy resin or the like. In addition, the low temperature curing in the low temperature curing type rubber is one that is cured at, for example, about 90 ° C to 160 ° C. The room temperature curing type is cured at about 25 ° C. to 50 ° C., and the high temperature curing type is cured at about 140 ° C. to 250 ° C.

  Thus, since the insulating cylinder part 140 is formed of the same silicone as the polymer coating material 114, the insulating cylinder part 140 is firmly bonded with good affinity with the garment tube 110. For example, since the insulating cylinder part 140 is made of the same silicone as the polymer coating material 114 having good adhesion to the main body part 112 of the garment tube 110, the insulating cylinder part 140 itself is connected to the FRP main body part 112 in the garment pipe 110. Good adhesion.

  In the air terminal connection insulator pipe unit 100, the electric field relaxation tube 135 surrounding the periphery of the receiving portion 130 and the connection portion between the receiving portion 130 and the conductor lead rod 120 is provided on one end side of the polymer insulating tube 110. ing. For this reason, the end portion of the power cable received by the receiving portion 130 is received and connected in a state surrounded by the electric field relaxation tube 135.

  Thus, when an insulating material is filled in the polymer insulator tube 110 to form an insulator in the polymer insulator tube, and then the power cable is connected and used as an air termination connection portion, the connection portion at the end of the power cable The electric field at the outer peripheral surface of the polymer insulation tube 110 can be relaxed.

  That is, even when connected to the end of an ultra-high voltage power cable to which a higher voltage is applied, the diameter of the insulating cylinder 140 does not increase, and the polymer insulation pipe 110 needs to extend the surface leakage distance. Therefore, it can be handled without increasing the overall length of the polymer insulator tube itself.

  That is, even when used in the air termination connection portion of a higher voltage ultra-high voltage cable, the insulating cylinder portion 140 and the polymer insulation tube 110 are not significantly increased in size, and can be used as a lighter and more compact unit. it can. Thereby, handling is easy and the assembly operation | work of an air termination | terminus connection part can be performed simply. In this case, the cost of the unit itself can be reduced.

  In addition, according to the garage pipe unit 100 for the air end connection part, the insulating cylinder part 140 is a pipe 110 in which the conductor extraction rod 120, the electric field relaxation pipe 135, the flexible energization part 150, and the receiving part 130 are disposed in the factory. Since it can be cast and solidified, it can be inspected and shipped in the unit state, and the assembly process at the site can be omitted, thereby reducing the number of work on site.

In assembling the air end connecting portion garment pipe unit 100 configured in this manner, the conductor lead-out rod 120 is connected to the conductor drawing rod 120 via the flexible energizing portion 150 in the polymer sill tube 110 to which the upper covering portion 116 is attached. After the receiving part 130 is disposed, the electric field relaxation tube 135 is attached. Next, the insulating cylinder portion 140 is formed by filling the polymer insulator tube 110 with an insulating material. Here, the filled insulating material is solidified to form a solid or gel-like insulating cylinder portion 140. Therefore, the insulation pipe part 100 for the air end connection part of the present embodiment is provided with the insulating cylinder part 140 in the polymer insulation pipe 110. In the field, the air end connection can be achieved simply by connecting the power cable terminal. The part can be formed. It should be noted that the air end connection portion insulating pipe unit 100 may be configured to be filled with an insulating fluid such as insulating oil or an insulating gas such as SF ₆ gas (sulfur hexafluoride) in the field.

  Next, the aerial termination connection unit 200 using the aerial termination connection unit garment pipe unit 100 will be described.

  FIG. 3 is a partial cross-sectional view of an air end connection portion 200 using the air end connection portion garment pipe unit 100 according to the present invention, and FIG. 4 is an air end connection portion garment tube according to the present invention. It is a figure which shows the connection method of the air termination | terminus connection part 200 using the unit 100. FIG.

  3 has a flange portion of a bottom fitting 118 attached to a support base 204 via a support insulator 202, and a power cable terminal (hereinafter, “ This is formed by inserting a cable terminal 310). In addition, the cable terminal 310 is shown by sectional drawing in FIG. 3, and is shown as a side view in FIG. In this case, in the air end connection portion insulating pipe unit 100, it is assumed that the insulating cylinder portion 140 is disposed in the polymer insulation tube 110 before the air end connection portion 200 is assembled using the unit. explain.

  As an assembling method of the air end connection portion 200 using the air end connection portion insulator pipe unit 100, first, the air end connection portion insulator pipe unit 100 is disposed on the lower surface of the bottom metal fitting 118. It attaches to the support stand 204 via the insulator 202 (refer FIG. 3).

  In addition, a stress cone 320 is attached to the outer periphery of the cable insulator 312 exposed by stripping the end of the cable of the power cable 300, and a conductor terminal 322 is attached to the tip of the cable conductor (see FIG. 4). ).

  The stress cone 320 is made of a pre-mold insulator having rubber-like elasticity such as ethylene propylene rubber (EP rubber), and the tip of the stress cone 320 is tapered to be attached to the inner wall surface of the receiving port of the receiving unit 130. A cone-shaped portion 324 is provided (see FIG. 4).

  Then, the cable terminal 310 having such a configuration is attached to the receiving port of the receiving portion, and a pressing device (not shown) disposed on the cable terminal 310 side is compressed toward the receiving port side. As a result, the conductor terminal 322 is fitted into the connecting portion 134a (see FIG. 1) of the in-cylinder conductive portion 134 (see FIG. 1) in the receiving portion 130, and the conductor is drawn out via the receiving portion 130 and the flexible energizing portion 150. In addition to being connected to the rod 120 in a conductive state, the cone-shaped portion 324 of the stress cone 320 is pressed against the inner wall surface of the receiving port of the receiving portion 130, and between the inner wall surface of the receiving portion and the outer peripheral surface of the cone-shaped portion 324. Interfacial insulation performance is ensured.

  As described above, in the end tube connector unit 100 for the air end connection portion, the end portion of the power cable is simply connected to the receiving portion 130 by inserting the end portion of the power cable, and the end portion of the power cable is connected to the electric field relaxation tube in the insulator tube 110. In a state surrounded by 135, the connection is established.

  As a result, even if the power cable to be received is an ultrahigh voltage power cable to which a higher voltage is applied, the electric field relaxation tube 135 performs electric field relaxation at the end of the power cable, and the electric field at the surface of the polymer insulation tube 110. Is alleviated. Therefore, the diameter of the insulating cylinder portion 140 is not increased, and this can be handled without increasing the overall length of the polymer insulator tube 110 itself.

  That is, unlike the conventional case, in order to receive the ultra high voltage power cable, it is not necessary to increase the diameter of the insulator tube, that is, to increase the thickness of the insulator tube and to increase the length of the insulator tube to ensure a large surface leakage distance. .

  Therefore, even when used in the aerial termination connection of higher voltage ultra-high voltage cables, the aerial termination connection has been reduced in weight and size without significantly increasing the size of the insulation cylinder and polymer insulation pipe. 200 can be formed.

  In addition, here, since the end tube connector unit 100 for the air end connection portion has the insulating cylinder portion 140 as a solid as an internal insulator in the polymer insulator tube 110, the end tube connector unit for the end air connector portion. 100 can be shipped after an electrical test in a factory or the like, and reliability can be improved.

  Further, when the air end connection portion 200 is manufactured using the air end connection portion insulating pipe unit 100 in which the insulating cylinder portion 140 is solid, the field assembly work includes only cable processing. Furthermore, the air end connection part 200 can be assembled by simply inserting the cable terminal 310 into the receiving port of the receiving part 130 of the air end connection part garment pipe unit 100. That is, unlike the conventional structure of an oil-insulated air terminal connection part for composite insulator pipes, the terminal connector part can be assembled without penetrating or deeply inserting the cable terminal itself into the insulator pipe. Therefore, the processing length at the end portion of the power cable can be shortened as compared with the conventional case regardless of the length of the insulation pipe.

  That is, in the air end connection portion garment pipe unit 100 of the present embodiment, as seen in the conventional air end connection portion, the end of the power cable to be connected is inserted from one end side and the other end. It differs from the structure which reaches to the part side vicinity.

In other words, the conventional air termination connection portion uses a porcelain insulator tube, an air termination connection portion filled with an insulating gas such as insulating oil or SF _6, and a polymer insulator tube instead of the porcelain insulator tube. As can be seen in a composite insulator tube filled with insulating oil or gas inside, the power cable has a configuration that penetrates the inside of the insulator tube, that is, a configuration that is inserted deep inside the insulator tube.

  On the other hand, in the air terminal connection garment pipe unit 100, the cable terminal 310 is simply inserted into the receiving port of the receiving part 130 provided on the base end (one end) 110a side of the garment pipe 110. Unlike the conventional case, the cable can be connected to other cables and devices on the tip end (other end) 110b side in an insulated state and connected to the power cable portion inserted into the insulation tube. The processing length of the terminal portion such as stripping is shortened.

  In addition, a solid insulating cylinder portion 140 can be provided inside the polymer insulation tube 110 in which the insulation tube 110 is covered with a silicone polymer coating material 114. For this reason, even if it is a high voltage (for example, 154 kV) power cable, the aerial termination connection portion of the insulation pipe unit 100 does not become thick and long and does not become heavy. Further, when assembling the aerial terminal connection portion of the high voltage cable, the work of filling the insulating oil or the insulating gas on site is not required. For this reason, it becomes easy to handle the garment pipe unit for the air end connection part, and it is possible to improve the working efficiency when assembling the air end connection part.

  Moreover, since the conductor lead-out rod 120 has a cylindrical shape, the weight can be reduced as compared with a solid conductor lead-out rod. Further, the outer diameter can be increased in a state where the cross-sectional area is larger than the cable conductor to be connected. Thereby, the conductor surface stress of the conductor extraction rod 120 itself can be relieved. The amount of a material such as silicone constituting the insulating cylinder portion 140 in the insulating tube 110 can be reduced.

  Further, in the air end connecting portion garment pipe unit 100 of the present embodiment, the conductor lead-out rod in the garment pipe 110 using the polymer and the receiving portion 130 are connected in a state of being conducted by the flexible energizing portion 150. . For this reason, it is possible to follow the deformation of the polymer insulator tube 110 and the insulating cylindrical portion 140 that are greatly deformed when subjected to a lateral load, and to prevent the bending force from being transmitted to the conductor lead bar 120, the receiving portion 130, and the like. .

  Thus, in the present embodiment, a cylindrical shape is formed, and the power cable terminal 310 is inserted from one end (base end) side, and the flange portion protruding radially is spaced apart in the longitudinal direction on the outer periphery. A large number of polymer insulator pipes 110, a receiving portion 130 which is disposed inside one end portion of the polymer insulator pipe and receives the power cable terminal 310 in a conductive state, and an axial center of the polymer insulator pipe 110 A conductor lead rod 120 that is connected to the receiving portion 130 on the one end side in a conductive state, and the receiving portion 130 and the receiving portion 130 inside the one end side of the polymer insulation tube 110. An electric field that is disposed so as to surround a connection portion with the conductor lead bar 120 from the side and relaxes the electric field at the receiving portion 130 and the connection portion between the receiving portion 130 and the conductor lead rod 120. And configured to have a sum tube 135.

  Further, in the present embodiment, there is a polymer having a cylindrical shape, in which the power cable terminal 310 is inserted from one end side, and a large number of radially extending flanges are formed apart from each other in the longitudinal direction on the outer periphery. A tube, a receiving portion 130 which is disposed inside one end portion of the polymer insulator tube 110 and receives the power cable terminal 310 in a conductive state, and is disposed on an axis of the polymer insulator tube 110 and has the one end A conductor lead rod 120 joined in a conductive state to the receiving portion 130 on the part side, and the receiving portion 130, the receiving portion 130, and the conductor leading rod 120 on one end side in the polymer insulation tube 110. An electric field relaxation tube 135 disposed so as to surround the periphery of the connection portion and relieving an electric field in the connection portion between the reception portion 130 and the reception portion 130 and the conductor lead bar 120; By filling and solidifying an insulating material between the polymer insulation tube 110, the conductor lead rod 120 and the receiving portion 130 in a state where the electric field relaxation tube 135 is disposed in the remerged insulation tube 110. It was made to have the cylindrical insulation cylinder part 140 arrange | positioned.

  As a result, in the gas terminal tube 100 for the air end connection portion, the electric field relaxation tube 135 surrounding the periphery of the receiving portion 130 and the connection portion between the receiving portion 130 and the conductor lead-out rod 120 on one end side of the polymer insulating tube 110. Therefore, the power cable terminal 310 received by the receiving unit 130 is received and connected in a state surrounded by the electric field relaxation tube 135. In this way, after filling the polymer insulator tube 110 with an insulating material and forming the insulating cylinder portion 140 in the polymer insulator tube, the power cable terminal 310 is connected and used as the air termination connection portion 200. The electric field at the connecting portion at the end is relaxed, and the electric field at the outer peripheral surface of the polymer insulation tube can be relaxed.

  That is, even when connected to the end of an ultra-high voltage power cable to which a higher voltage is applied, the diameter of the insulating cylinder 140 does not increase, and the polymer insulation pipe 110 needs to extend the surface leakage distance. Therefore, it can be handled without increasing the overall length of the polymer insulator tube 110 itself. In other words, even when used in the air termination connection part of a higher voltage ultra-high voltage cable, the insulation cylinder part 140 and the polymer insulation pipe are not significantly increased in size, and used as a lighter and more compact unit. It is easy to handle, and the assembling work of the air end connection part can be performed easily. In this case, the cost of the unit itself can be reduced.

  In the present embodiment, the electric field relaxation tube 135 is provided in a state where the outer peripheral surface thereof is in close contact with the inner wall on the one end side of the polymer insulating tube 110. Thereby, with the electric field relaxation tube 135 positioned, the insulating cylinder portion 140 is disposed between the polymer insulator tube 110, the polymer insulator tube 110, and the receiving portion 130 and the connecting portion between the receiving portion 130 and the conductor lead rod 120. Can be easily formed.

  Furthermore, in the aerial termination connection part 200 of the present embodiment, a power cable terminal 310 is attached to the receiving part 130 of the above-mentioned aerial terminal connection insulator pipe unit 100.

  An electric field relaxation tube 135 is arranged around the power cable terminal 310 just by connecting the power cable 300 after filling the polymer insulator tube 110 with an insulating material and forming the insulating cylinder portion 140 in the polymer insulator tube 110. Thus, the air terminal connection portion 200 in which the electric field at the connection portion at the end of the power cable and the electric field at the outer peripheral surface of the polymer insulation tube 110 are relaxed is obtained.

  Therefore, the air terminal connection portion of the ultra-high-voltage power cable to which a high voltage is applied, which is compact and low in cost.

  The garment pipe unit for an air termination connection portion and the air termination connection portion according to the present invention are not limited to the above embodiments, and can be implemented with various modifications.

  The air termination connection portion and the air termination connection portion according to the present invention are easy to handle and can be suitably assembled to the air termination connection portion of a high-voltage power cable. It is useful as a device that can be used for an air termination connection portion of a high-voltage power cable.

Sectional drawing which shows the structure of the insulator pipe unit for the air termination | terminus connection parts which concerns on one embodiment of this invention The schematic diagram which shows an example of the flexible electricity supply part in the insulator pipe unit for the air termination | terminus connection parts which concerns on one embodiment of this invention. The fragmentary sectional view of the air termination | terminus connection part using the insulator pipe unit for air | atmosphere termination connection parts concerning the present invention The figure which shows the connection method of the air termination | terminus connection part using the insulator pipe unit for air | atmosphere termination connection parts which concerns on this invention

Explanation of symbols

100 Insulation terminal unit for air termination connection 110 Insulation tube (polymer insulation tube)
110a Base end portion of insulating tube 112 Main body portion 114 Polymer coating material (insulation jacket portion)
114a ridge portion 120 conductor lead rod 122 one end portion of the conductor lead rod 124 other end portion of the conductor lead rod 130 receiving portion 132 receiving portion main body 134 in-cylinder conducting portion 135 electric field relaxation tube 140 insulating cylinder portion 152a divided body 200 air end connection Part 300 Power cable 310 Power cable terminal

Claims (3)

A cylindrical shape, and a power cable terminal is inserted from one end side, and on the outer periphery, a large number of flange portions protruding radially are formed in the longitudinal direction so as to be spaced apart from each other in the longitudinal direction;
A receiving portion that is disposed inside one end portion of the polymer insulator tube and receives the power cable terminal in a conductive state;
A conductor lead bar disposed on the axis of the polymer insulator tube and joined in a conductive state to the receiving portion on the one end side;
It is formed using a material corresponding to the type of insulating mixture that forms the insulating cylinder portion provided in the polymer insulation tube, and the receiving portion, the receiving portion, and the conductor extraction rod are provided on one end side in the polymer insulation tube. An electric field relaxation tube which is arranged so as to surround the periphery of the connection portion and relaxes the electric field at the connection portion between the receiving portion and the receiving portion and the conductor lead bar,
A cylinder disposed by filling and solidifying an insulating material between the polymer insulation tube, the conductor lead bar and the receiving portion in a state where the electric field relaxation tube is disposed in the polymer insulation tube. A cylindrical insulating cylinder,
Cover the outer circumference of the end of the conductor lead bar arranged on the same axis and the connection part of the receiving part with a conductive cylindrical connection part, or in the middle of the connecting part of the conductor lead bar and the receiving part or the conductor lead bar A flexible conductor (flexible stranded wire) or a short cable is provided to allow the conductor lead-out rod and the receiving portion in the polymer insulation pipe to be energized in a state of following the bending of the polymer insulation pipe. With
The polymer insulator tube has a cylindrical main body made of epoxy resin or FRP, and
In the outer peripheral part of the main body part, having an insulating jacket part made of silicon resin having a plurality of flanges arranged in the longitudinal direction,
The insulating tube portion is filled with the same kind of silicon resin as the insulating jacket portion and solidified, and is a garment tube unit for an air end connection portion. The insulation tube portion silicone resin of the gel-like resin in which claim 1 aerial gastric tube unit for sealing end according formed by solidifying. The field relaxation tube, in a state where the outer circumferential surface in close contact with the inner wall of one end of the polymer had pipe, provided, characterized in that has claim 1, wherein the air in the terminating connection portion is had tube unit .

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