JP7663545B2 - Transport structure of hollow insulator unit and transport method of hollow insulator unit - Google Patents

Description

The present invention relates to a transport device for transporting hollow insulator units and a method for transporting hollow insulator units.

Conventionally, air termination connections that use an insulating tube to provide air insulation have been known as cable termination connections provided at the end of a power cable (see, for example, Patent Document 1). In the prefabricated air termination connections disclosed in Patent Document 1 and other documents, an insulating medium such as insulating oil (e.g., silicone oil) is generally enclosed within the insulating tube.

Large terminal connections are difficult to transport vertically, so they are usually transported horizontally on their side (see, for example, Patent Document 2). In the case of terminal connections in which an insulating medium is filled inside the hollow insulator, the terminal connections are transported horizontally to the construction site, where the insulating medium is filled (hereinafter referred to as "oil filling").

JP 2000-261948 A Japanese Patent Application Publication No. 10-275531 Patent No. 5606252

Showa Electric Wire Review, "Development and Practical Application of 66/77kV Direct Molded Through Bushings", Vol. 56, No. 1 (2006) pp. 15-19

However, filling the insulating medium with oil at the construction site takes time, and a clean room must be set up to avoid the risk of foreign matter getting into the insulating pipe, lengthening the construction period. In addition, when the insulating medium is a designated flammable material, it is difficult to transport large quantities of the insulating medium in drums to the construction site due to the designated quantities. Also, in order to perform the oil filling work at the construction site, equipment such as a gear pump is required at the construction site.

On the other hand, to facilitate installation at the construction site, it is also possible to fill the terminal connection with oil at the factory before transporting it. However, in order to prevent damage to the hollow insulator due to thermal expansion of the insulating medium, the hollow insulator cannot be filled to the brim with the insulating medium. As a result, during transportation, the liquid surface of the insulating medium vibrates inside the hollow insulator, causing a hammering effect that reduces stability and may even cause leakage of the insulating medium.

An object of the present disclosure is to provide a transport structure and a transport method for an insulator pipe unit that can safely transport an insulator pipe unit to a destination such as a construction site with an insulating medium sealed in the insulator pipe body, and that can facilitate installation work at the construction site.

The transportation structure of the hollow insulator unit according to the present disclosure includes:
A transport structure for an insulator unit for transporting an insulator unit including at least a hollow insulator body, a lower metal fitting provided integrally with a rear end portion of the hollow insulator body, and a fixing metal fitting fastened to the lower metal fitting and disposed on the rear end side of the hollow insulator body, with an insulating medium sealed inside the hollow insulator body, the transport structure comprising:
a stand capable of fixing the hollow insulator unit in a horizontal state;
a liquid tank capable of allowing the insulating medium to flow in and out between the liquid tank and the insulating pipe body;
a first liquid hose that connects a first flow path provided in the fixing metal fitting and the liquid tank and allows the insulating medium to flow in and out between the liquid tank and an inside of the hollow insulator body ,
The frame is
A stand base and
a tip-side fixing portion that is attached perpendicularly to the frame base and fixes a tip portion of the hollow insulator unit;
a rear end fixing portion that is attached perpendicularly to the frame base and fixes a rear end portion of the hollow insulator unit,
The liquid tank is positioned on the stand so that, rearward of the rear end fixing portion, the vertical height of the bottom surface of the liquid storage space in the liquid tank is higher than the vertical height of the top surface of the liquid storage space in the hollow insulator body when the hollow insulator unit to be fixed is in a horizontal state.

A method for transporting hollow insulator units according to the present disclosure includes the steps of:
a step of fixing the hollow insulator unit to the frame of the transportation structure for the hollow insulator unit;
connecting the hollow insulator body and the liquid tank;
and transporting the hollow insulator unit to a destination while being fixed to the frame .

According to the present disclosure, the hollow insulator unit can be safely transported to a destination such as a construction site while the insulating medium is sealed in the hollow insulator body, facilitating installation work at the construction site.

FIG. 1 is a cross-sectional view showing a cable termination portion which is an example of an insulator unit. FIG. 2 is a side view showing a transportation device according to an embodiment. FIG. 3 is a perspective view showing a platform of the transportation device according to the embodiment. 4A is a diagram showing a process of fixing a cable termination to a transportation device. FIG. 4B illustrates a process for securing a cable termination to a transportation device. FIG. 4C illustrates a process for securing the cable termination to the transportation device. FIG. 4D illustrates a process for securing a cable termination to a transportation device.

The following describes in detail the embodiments of the present invention with reference to the drawings.

Figure 1 is a cross-sectional view showing a cable termination connection part 500, which is an example of an insulator unit. The cable termination connection part 500 is an insulator unit provided at the end of a cable terminal part (not shown), and is transported to a destination such as a construction site by a transport device 1, which will be described later.

As shown in FIG. 1, the cable termination connection part 500 includes an insulator tube 510, a fixing bracket 541, a terminal mounting bracket 542, and a conductor pull-out rod 544. In the following description, the side from which the conductor pull-out rod 544 is pulled out is referred to as the "tip side," and the side to which the cable terminal part (not shown) is attached is referred to as the "rear side."

The hollow insulator 510 has a hollow insulator body 511 with a cap portion 511a formed on the outer circumferential surface, an upper metal fitting 512 that seals the tip side of the hollow insulator body 511, an insulating unit 520, an electric field mitigation portion 530, and an insulating medium 543. The hollow insulator body 511 may be, for example, a porcelain hollow insulator, or a polymer hollow insulator (also called a composite hollow insulator) in which a polymer coating made of a polymer insulating material such as silicone rubber is integrally formed on the outside of a cylindrical body made of fiber reinforced plastics (FRP).

The insulating unit 520 has an inner conductor 521 extending in the axial direction, an insulating tube 522 arranged on the outer peripheral surface of the inner conductor 521, and a shielding portion 523 formed on the outer peripheral surface of the insulating tube 522, and functions as a reinforcing insulating portion of the termination connection portion 500. The inner conductor 521 and the insulating tube 522 are integrally formed by molding.

The internal conductor 521 is formed of a conductive material suitable for electrical conduction, such as copper, aluminum, a copper alloy, or an aluminum alloy. The inner circumferential surface of the rear end of the internal conductor 521 is exposed from the insulating tube 522, and is provided with a conductor insertion section 521a for electrically connecting a cable conductor (not shown). The tip end of the internal conductor 521 passes through the insulating tube 522 and is connected to the conductor lead rod 544.

The insulating tube 522 is formed of a hard plastic resin material (e.g., epoxy resin or FRP) with high mechanical strength. A cone-shaped terminal insertion portion 522a that receives the cable terminal portion (not shown) is provided at the rear end of the insulating tube 522. The terminal insertion portion 522a communicates with the conductor insertion portion 521a of the internal conductor 521. The conductor insertion portion 521a and the terminal insertion portion 522a form the cable receiving portion 524 to which the cable terminal portion is attached.

The shielding portion 523 is formed, for example, by applying a conductive paint to the outer peripheral surface of the insulating tube 522. By providing the shielding portion 523, the electric field inside the insulating tube 522 is made uniform without concentrating the electric field between the internal conductor 521 and the shielding portion 523, and the electrical characteristics are stabilized.

The electric field mitigation section 530 is formed of a cylindrical elastic body having an insulating section 531 at the tip side and a conductive section 532 at the rear end side. The insulating section 531 is concentrically connected to the conductive section 532 at the rear end side, and is formed in a cylindrical shape from an insulating rubber material such as ethylene propylene rubber (EP rubber). The conductive section 532 is formed in a cylindrical shape from a semiconductive rubber material such as semiconductive EP rubber. The insulating section 531 and the conductive section 532 are integrally formed by molding. The electric field mitigation section 530 is arranged so that the outer peripheral surface of the small diameter part at the tip side of the insulating unit 520 overlaps with the inner peripheral surface of the conductive section 532 so that the shielding section 523 is conductive with the inner peripheral surface of the conductive section 532, and the tip of the shielding section 523 does not protrude from the inner peripheral surface of the conductive section 532.

The fixing bracket 541 is a flange-shaped member having an opening for passing the insulating unit 520 through. The fixing bracket 541 is disposed on the rear end side of the insulator tube body 511, and is fastened, for example, by bolting, to the lower bracket 513 that is integrally provided at the rear end of the insulator tube body 511. In addition, a support insulator 545 is disposed on the rear end side of the fixing bracket 541, and is fastened, for example, by bolting.

The terminal mounting bracket 542 is a cylindrical member with a bottom that is arranged on the outer peripheral surface of the rear end of the insulation unit 520. The bottom 542a of the terminal mounting bracket 542 is provided with an opening 542b for inserting the cable terminal portion (not shown). The terminal mounting bracket 542 is arranged on the rear end side of the fixing bracket 541, and is fastened to the fixing bracket 541 and the insulation unit 520 by, for example, bolting.

The inner diameter of the fixing bracket 541 and the terminal mounting bracket 542 is approximately the same as the outer diameter of the rear end of the insulating unit 520. A seal member such as an O-ring (not shown) is disposed between the fixing bracket 541 and the insulating unit 520. By interposing a seal member between the fixing bracket 541 and the insulating unit 520, the inside of the hollow insulator body 511 can be kept airtight or liquidtight to prevent leakage of the insulating medium 543 and to relieve bending stress generated in the hollow insulator body 511. It is preferable to provide multiple seal members at predetermined intervals in the axial direction.

The insulating medium 543 is sealed in the space between the insulator body 511 and the insulating unit 520, and functions as the main insulating part of the cable termination connection part 500. The insulating medium 543 is formed of an insulating oil such as silicone oil.

The insulating medium 543 is injected into the inside of the hollow insulator 510 (inside the hollow insulator body 511) through a flow path (not shown) provided in the fixing bracket 541, for example. A liquid hose 547 that allows the insulating medium 543 to flow in and out is connected to the flow path provided in the fixing bracket 541 (see FIG. 2). The liquid hose 547 is preferably a high-pressure hose such as a flexible hose. A one-touch coupler 546 is provided at one end of the liquid hose 547, allowing a hose for oil filling and oil removal (for example, the liquid hose 22 of the liquid tank 20) to be easily attached and detached.

The rear end of the conductor pull-out rod 544 is connected to the internal conductor 521 of the insulating unit 520, and the front end passes through the upper metal fitting 512 of the hollow insulator 510 and is pulled out to the outside. The conductor pull-out rod 544 is connected to the internal conductor 521 of the insulating unit 520, for example, via an appropriate conductor connecting member. In addition, the portion of the conductor pull-out rod 544 that is disposed inside the hollow insulator body 511 may be a flexible conductor such as a cable.

Figure 2 is a side view showing a transportation device 1 according to an embodiment. Figure 3 is a perspective view showing a stand 10 of the transportation device 1. Figure 2 shows a state in which a cable termination connection part 500, which is an example of an insulator unit, is fixed to the transportation device 1. When fixed to the transportation device 1, the cable termination connection part 500 is not connected to a cable terminal part, and a cover is attached to the rear end part of the insulation unit 520 to prevent dust and the like from entering the inside.

The transport device 1 employs several unique configurations to enable the cable termination connection part 500 (an example of an insulator unit) in which an insulating medium 543 is enclosed within an insulator body 511 to be safely transported in a horizontal, sideways position to a destination (e.g., a construction site).

As shown in FIG. 2, the transport device 1 includes a platform 10, a liquid tank 20, and an intermediate fixing part 30.

As shown in FIG. 3, the mount 10 has a mount base 11, a front end fixing part 12, a rear end fixing part 13, a tank holding part 14, etc., and is capable of fixing the cable termination connection part 500 in a horizontal state.

The mount base 11 has a rectangular shape when viewed vertically, is installed horizontally, and supports the front end fixing part 12, the rear end fixing part 13, and the tank holding part 14. The mount base 11 has a recess 111 that can store the insulating medium 543 that has leaked from the insulator body 511 of the cable termination connection part 500, and functions as a so-called oil pan.

The mount base 11 may be composed of one member or multiple members. In this embodiment, the mount base 11 is composed of a connected body in which three base members 11A to 11C are connected. In this case, the length of the mount base 11 can be easily adjusted according to the length of the cable termination connection part 500 (the length of the hollow insulator 510). In addition, by disassembling the mount base 11, the storage space for the mount 10 can be reduced. Note that the number of base members constituting the mount base 11 is not limited to three and can be changed as appropriate.

When the mounting base 11 is constructed of a connected body of multiple base members, it is preferable that the height of the partition wall 112 formed at the connected portion is lower than the side wall 113 of the mounting base 11 extending in the longitudinal direction. In this case, the leaked insulating medium 543 is first stored in the recess 111 of the base member (any of 11A to 11C) in the portion corresponding to the leakage point, and even if it is stored above the height of the partition wall 112, it can easily move between the recesses 111 of adjacent base members, increasing the storage capacity. In addition, the partition wall 112 functions as a reinforcing material for the mounting base 11.

The tip fixing part 12 is attached perpendicularly to the mounting base 11 and fixes the tip of the cable termination connection part 500, specifically, the upper metal fitting 512 of the hollow insulator 510. The tip fixing part 12 has a tip fixing frame 121 that fixes the upper metal fitting 512, and a tip support 122 that is erected on the mounting base 11 and supports the tip fixing frame 121.

The tip fixing frame 121 has a lower fixing frame 121A and an upper fixing frame 121B. The lower fixing frame 121A and the upper fixing frame 121B each have, for example, a substantially U-shape, and when the lower fixing frame 121A and the upper fixing frame 121B are joined together, they have a substantially rectangular shape. The lower fixing frame 121A and the upper fixing frame 121B are fixed to the tip support 122, for example, by bolt fastening. With the tip of the cable termination connection part 500 placed on the lower fixing frame 121A, the upper fixing frame 121B is placed over and clamped from above, thereby fixing the tip of the cable termination connection part 500 to the tip fixing frame 121.

The lower fixing frame 121A and the upper fixing frame 121B each have a substantially V-shaped pressing portion 123 at the base of the substantially U-shape. The tip of the cable termination connection part 500 (specifically, the outer periphery of the disk-shaped upper metal fitting 512 in the embodiment) comes into contact with the pressing portion 123 at multiple points, so that the axial misalignment of the cable termination connection part 500 can be easily absorbed, and the cable termination connection part 500 can be held in a stable position.

The rear end fixing part 13 is attached perpendicularly to the mounting base 11 and fixes the rear end of the cable termination connection part 500, specifically, the fixing bracket 541 arranged on the rear end side of the hollow insulator 510 in this embodiment. The rear end fixing part 13 has a rear end fixing frame 131 that fixes the fixing bracket 541, and a rear end support 132 that is erected on the mounting base 11 and supports the rear end fixing frame 131.

The rear end fixing frame 131 is a rectangular frame body, and is firmly fixed to the fixing bracket 541 of the cable termination connection part 500, for example, by bolting. The rear end fixing frame 131 also has a rotation axis that is perpendicular to the axial direction of the cable termination connection part 500 (axial direction of the hollow insulator 510) in the horizontal plane. The rear end fixing frame 131 is attached to the rear end support 132 via a bearing 133 that serves as a bearing for the rotation axis, and is rotatable around the rotation axis.

The tank holding section 14 holds the liquid tank 20 at the top of a support attached vertically to the pedestal base 11. The height of the tank holding section 14 is set so that the vertical height of the liquid tank 20 is higher than the vertical height of the cable termination connection section 500 when the cable termination connection section 500 is fixed to the pedestal 10 in a horizontal state. The "vertical height of the liquid tank 20" refers to the vertical height of the bottom surface of the liquid storage space in the tank body 21. In addition, the "vertical height of the cable termination connection section 500" refers to the vertical height of the top surface of the liquid storage space in the hollow insulator body 511 in a horizontal state.

The liquid tank 20 has a tank body 21 and a liquid hose 22. A one-touch coupler 23 is attached to the tip of the liquid hose 22. The tank body 21 is fixed to the tank holding portion 14 of the frame 10 and is connected to the insulating tube 510 via the liquid hose 22, 547, allowing the insulative medium 543 to flow in and out.

An appropriate amount of insulating medium 543 is enclosed in the tank body 21. Specifically, the volume of the tank body 21 and the capacity of the stored insulating medium 543 are set so that when the insulating medium 543 thermally contracts in a state in which the insulating medium 543 is fully filled in the hollow insulator body 511, an amount of insulating medium 543 equivalent to the amount of contraction can be replenished, and an amount of insulating medium 543 equivalent to the amount of expansion of the insulating medium 543 when the insulating medium 543 thermally expands can be received. In the embodiment, the insulating medium 543 is filled to about half the height inside the tank body 21.

When the insulating medium 543 contracts due to the surrounding temperature environment, an amount of the insulating medium 543 equivalent to the amount of contraction flows from the liquid tank 20 into the hollow insulator 510, and when the insulating medium 543 expands, an amount of the insulating medium 543 equivalent to the amount of expansion flows from the hollow insulator body 511 into the liquid tank 20. Since the vertical height of the bottom surface of the liquid storage space in the tank body 21 is higher than the vertical height of the top surface of the liquid storage space in the hollow insulator body 511 in a horizontal state, the hollow insulator body 511 is always kept filled with the insulating medium 543.

The intermediate fixing parts 30 support the intermediate part between the front end and rear end of the cable termination connection part 500 (insulator unit). In this embodiment, two intermediate fixing parts 30 are provided. The number of intermediate fixing parts 30 can be changed as appropriate depending on the length of the cable termination connection part 500 (length of the insulator 510).

The intermediate fixing part 30 has an intermediate support frame 31 that supports the insulator body 511, and a height adjustment part 32 that is fixed perpendicularly to the frame base 11 and adjusts the height of the intermediate support frame 31.

The intermediate support frame 31 has a lower support frame 31A arranged on the lower side and an upper support frame 31B arranged on the upper side. Note that the upper support frame 31B is omitted in FIG. 3. The lower support frame 31A and the upper support frame 31B are fixed to the height adjustment unit 32. With the intermediate part of the cable termination connection part 500 placed on the lower support frame 31A, the upper support frame 31B is placed over and clamped from above, thereby fixing the intermediate part of the cable termination connection part 500 to the intermediate support frame 31.

The lower support frame 31A and the upper support frame 31B each have a frame body 311 and an insulator tube receiving portion 312. The insulator tube receiving portion 312 has a shape that can fit the peripheral shape of the insulator tube body 511, i.e., the uneven shape of the cap portion 511a, and fixes the peripheral surface of the insulator tube body 511. Specifically, the insulator tube receiving portion 312 has an arc shape that can fit into the recess between the cap portions 511a and support the insulator tube body 511. In this embodiment, the lower support frame 31A and the upper support frame 31B each have three insulator tube receiving portions 312. The number of insulator tube receiving portions 312 can be changed as appropriate.

The height adjustment unit 32 is interposed between the frame 10 and the intermediate support frame 31, and adjusts the height of the intermediate support frame 31. The height adjustment unit 32 is, for example, configured as a pantograph-type jack. The height adjustment unit 32 makes it easy to adjust the height of the intermediate support frame 31, and allows the intermediate support frame 31 to be attached in an appropriate state to the peripheral surface of the hollow insulator body 511.

Figures 4A to 4D are diagrams showing an example of a process for fixing a cable termination connection part 500, which is an example of an insulator unit, to a transportation device 1.

When the cable termination connection part 500 is fixed to the transport device 1, the upper fixing frame 121B of the frame 10 and the upper support frame 31B of the intermediate fixing part 30 are removed. The rectangular opening of the rear end fixing frame 131 faces the vertical direction. If the insulating medium 543 is filled into the insulating pipe body 511 when the liquid tank 20 and the inside of the insulating pipe body 511 are not connected, the insulating pipe body 511 may be damaged due to thermal expansion of the insulating medium 543, so an appropriate amount of insulating medium 543 is enclosed in the insulating pipe body 511. The appropriate amount means that the insulating medium 543 is not filled into the insulating pipe body 511 as in the normal operation of the cable termination connection part 500, and it is preferable to fill the insulating medium 543 to a height of 60 to 90% of the total length of the insulating pipe body 511 at the stage of attachment to the transport device 1 in FIG. 4A.

First, as shown in FIG. 4A, a sling 549 for lifting is attached to the eye bolt 548 attached to the fixing bracket 541 and upper bracket 512 of the cable termination connection part 500. The sling 549 is hoisted by a crane or the like to lift the cable termination connection part 500 vertically upward, and the transport device 1 or the cable termination connection part 500 is moved to align the rear end fixing frame 131 of the frame 10 with the cable termination connection part 500.

Next, as shown in FIG. 4B, the sling 549 is lowered, the cable termination connection part 500 is inserted into the rear end fixing frame 131, and the fixing bracket 541 is fixed to the rear end fixing frame 131.

Next, as shown in FIG. 4C, the crane is moved while the sling 549 is further lowered. The cable termination connection part 500 rotates around the rotation axis together with the rear end fixing frame 131 via the bearing 133.

As shown in FIG. 4D, the sling 549 is further lowered and the tip of the cable termination connection part 500 is placed on the lower fixed frame 121A of the frame 10. The upper fixed frame 121B is attached to the top of the lower fixed frame 121A, and the tip of the cable termination connection part 500 is clamped and fixed by the lower fixed frame 121A and the upper fixed frame 121B. The height adjustment part 32 of the intermediate fixed part 30 is also adjusted so that the lower support frame 31A abuts against the insulator body 511. The upper support frame 31B is attached, and the intermediate part of the cable termination connection part 500 is clamped and fixed by the lower support frame 31A and the upper support frame 31B.

In this way, as shown in FIG. 2, the cable termination connection part 500 is fixed to the frame 10 in a horizontal state. In this state, a drum pipe (not shown) prepared separately is connected to the one-touch coupler 546, and the insulating medium 543 is filled up in the insulator tube body 511. In other words, the insulating medium 543 is filled up to 60-90% in the state shown in FIG. 4A, but the insulating medium 543 is replenished to fill the remaining hollow part and make it full. After it is filled up, the liquid hose 22, 547 is connected via the one-touch coupler 23, 546. As a result, the inside of the insulator tube body 511 of the cable termination connection part 500 fixed to the frame 10 is connected to the inside of the tank body 21, and the insulating medium 543 in the insulator tube body 511 is always kept in a full state.

As described above, the transportation device 1 and the transportation method according to this embodiment have the following features, either alone or in any suitable combination:

That is, the transport device 1 is a transport device for transporting a cable termination connection part 500 (insulating pipe unit) in which an insulating medium 543 is enclosed in an insulating pipe main body 511, and includes a stand 10 capable of fixing the cable termination connection part 500 in a horizontal state, and a liquid tank 20 connected to the insulating pipe main body 511 and capable of flowing the insulating medium 543 in and out of the insulating pipe main body 511. The stand 10 has a stand base 11, a tip side fixing part 12 that is attached vertically to the stand base 11 and fixes the tip end of the cable termination connection part 500, and a rear end side fixing part 13 that is attached vertically to the stand base 11 and fixes the rear end of the cable termination connection part 500. The liquid tank 20 is arranged on the stand 10 so that the vertical height of the bottom surface of the liquid storage space in the tank main body 21 is higher than the vertical height of the top surface of the liquid storage space in the insulating pipe main body 511 in a horizontal state.

The method for transporting the cable termination connection part 500 (insulating pipe unit) according to the embodiment includes a step of fixing the cable termination connection part 500 to the frame 10 of the transport device 1 (see Figures 4A and 4B), a step of connecting the insulating pipe main body 511 and the liquid tank 21 (see Figure 2), and a step of transporting the cable termination connection part 500 to the destination while it is fixed to the transport device 1.

According to the transport device 1 and the transport method, the insulating medium 543 is always kept in a fully filled state in the hollow insulator body 511, so that no liquid surface vibration occurs during transport. Therefore, the cable end connection part 500 (hollow insulator unit) can be safely transported to a destination such as a construction site with the insulating medium 543 sealed in the hollow insulator body 511, and the installation work at the construction site can be facilitated. At the construction site, a predetermined amount of insulating medium 543 is discharged from the hollow insulator body 511 through a flow path (not shown) provided in the fixing bracket 541 to obtain the amount of insulating medium 543 required during normal operation of the cable end connection part 500 (hollow insulator unit). Specifically, the insulating medium 543 is discharged until the insulating medium 543 is sealed up to a height of 60 to 90% of the total length of the hollow insulator body 511. Therefore, it is no longer necessary to perform the oil filling work, which took a lot of time at the construction site, on-site, and the construction time at the construction site can be significantly reduced. In addition, equipment such as gear pumps that were previously required for oil loading work at the construction site no longer need to be brought to the site, reducing the amount of construction equipment used on-site.

In addition, in the transport device 1, the rear end fixing part 13 has a rear end fixing frame 131 attached to the peripheral surface of the hollow insulator body 511, and a rear end support 132 that rotatably supports the rear end fixing frame 131 around a rotation axis in a horizontal plane perpendicular to the axial direction of the cable termination connection part 500 (hollow insulator unit).

The method for transporting the cable termination connection part 500 (insulating pipe unit) according to the embodiment includes the steps of fixing the cable termination connection part 500 in a vertical position to the frame 10 of the transport device 1 (see Figures 4A and 4B), rotating the cable termination connection part 500 around the axis of rotation to move it to a horizontal position (see Figures 4C and 4D), connecting the insulating pipe main body 511 to the liquid tank 20 (see Figure 2), and transporting the cable termination connection part 500 to a destination while it is fixed to the transport device 1.

According to the transport device 1 and the transport method, after the cable end connection part 500 (insulating pipe unit) is transported in a horizontal state, the cable end connection part 500 can be easily rotated and moved to a vertical state at the construction site. Therefore, the cable end connection part 500 can be safely transported to a destination (for example, a construction site) with the insulating medium 543 enclosed in the insulating pipe body 511, and the installation work at the construction site can be further facilitated. At the construction site, a predetermined amount of the insulating medium 543 is discharged from the insulating pipe body 511 through a flow path (not shown) provided in the fixing bracket 541 to obtain the amount of insulating medium 543 required during normal operation of the cable end connection part 500 (insulating pipe unit). Specifically, the insulating medium 543 is discharged until the insulating medium 543 is enclosed to a height of 60 to 90% of the total length of the insulating pipe body 511. Therefore, it is no longer necessary to perform the oil filling work, which took a lot of time at the construction site, on-site, and the construction time at the construction site can be significantly reduced. In addition, equipment such as gear pumps that were previously required for oil loading work at the construction site no longer need to be brought to the site, reducing the amount of construction equipment used on-site.

In addition, in the transport device 1, the frame base 11 can store the insulating medium 543 that has leaked from the hollow insulator body 511. As a result, even if the insulating medium 543 leaks from the hollow insulator body 511, it is stored in the recess 111 of the frame base 11, so that the damage caused by the oil leakage can be prevented from spreading to the outside.

The transport device 1 also includes an intermediate fixing part 30 that supports the intermediate part between the front and rear ends of the cable termination connection part 500 (insulating tube unit), and the intermediate fixing part 30 has an intermediate part support frame 31 that is attached to the peripheral surface of the insulating tube main body 511, and a height adjustment part 32 that can adjust the height of the intermediate part support frame 31. This allows the height of the intermediate part support frame 31 to be appropriately adjusted to support the intermediate part of the cable termination connection part 500 in an appropriate state, and allows the cable termination connection part 500 to be transported in a stable posture.

In addition, in the transport device 1, the middle support frame 31 has a shape that can fit the peripheral shape of the hollow insulator body 511. This allows the middle part of the cable termination connection part 500 to be supported in a more appropriate state, and the cable termination connection part 500 can be transported in a stable position.

In addition, in the transport device 1, the liquid tank 20 is connected to the hollow insulator body 511 via a one-touch coupler 23. This makes it easier to fill and drain the insulating medium 543 with oil, and shortens the work time.

In addition, in the transportation device 1, the tip side fixing part 12 has a tip fixing frame 121 that is attached to the peripheral surface of the upper metal fitting 512 of the cable termination connection part 500 (insulating tube unit), and the tip fixing frame 121 is in multi-point contact with the peripheral surface of the upper metal fitting 512. This makes it possible to easily absorb axial misalignment of the cable termination connection part 500 and to hold it in a stable position.

The invention made by the inventor has been specifically described above based on the embodiment, but the invention is not limited to the above embodiment and can be modified without departing from the gist of the invention.

For example, in the above embodiment, an example was described in which the hollow insulator unit fixed to the transportation device according to the present invention is a cable termination connection part, but this is not limited thereto. For example, the hollow insulator unit may be an equipment bushing (also called an "equipment through bushing"). The equipment side of the equipment bushing has a known shape compatible with oil insulation and/or gas insulation, and can be used for transformers or GIS (gas insulated switchgear).

In the case of an equipment bushing, the rear end side of the insulating tube of the insulating unit placed inside the insulator tube body 511 does not have a cable receiving port structure like the cable receiving portion 524, but has a head portion that can withstand oil insulation and/or gas insulation inside the equipment. The head portion is formed in a known shape including a portion that tapers in diameter from the front end side to the rear end side (in other words, tapers in diameter toward the inside of the equipment to which it is attached) (for example, see the equipment side shape of the through bushing in Figure 1 of Non-Patent Document 1 and the structure below the flange portion in Figure 1 of Patent Document 3).

In other words, when the hollow insulator unit fixed to the transport device according to the present invention is an equipment bushing, the rear end of the inner conductor does not have a conductor insertion section for connecting a cable conductor, and the rod-shaped inner conductor penetrates and protrudes from the head section at the rear end of the insulating tube. The rear end of the protruding inner conductor may remain rod-shaped, or may have a shield shape to prevent partial discharge. In addition, a shielding metal fitting may be provided as appropriate to relieve the electric field at the head section.

When the insulator unit is the cable termination connection part 500, the rear end fixing frame 131 of the rear end fixing part 13 of the transport device 1 is fixed to the fixing bracket 541 of the cable termination connection part 500, but when the insulator unit is an equipment bushing, the rear end fixing frame 131 is fixed to a flange provided at the corresponding position of the equipment bushing (i.e., fastened to the lower bracket 513 integrally provided at the rear end of the insulator body 511). By fixing this flange to the equipment, the equipment bushing is fixed to the equipment.

The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is indicated by the claims, not by the above description, and is intended to include all modifications within the meaning and scope of the claims.

REFERENCE SIGNS LIST 1 Transport device 10 Platform 11 Platform base 12 Front end fixing portion 13 Rear end fixing portion 14 Tank holding portion 20 Liquid tank 21 Tank body 22 Liquid hose 23 One-touch coupler 30 Intermediate fixing portion

Claims (12)

A transport structure for an insulator unit for transporting an insulator unit including at least a hollow insulator body, a lower metal fitting provided integrally with a rear end portion of the hollow insulator body, and a fixing metal fitting fastened to the lower metal fitting and disposed on the rear end side of the hollow insulator body, with an insulating medium sealed inside the hollow insulator body, the transport structure comprising:
a stand capable of fixing the hollow insulator unit in a horizontal state;
a liquid tank capable of allowing the insulating medium to flow in and out between the liquid tank and the insulating pipe body;
a first liquid hose that connects a first flow path provided in the fixing metal fitting and the liquid tank and allows the insulating medium to flow in and out between the liquid tank and an inside of the hollow insulator body ,
The frame is
A stand base and
a tip-side fixing portion that is attached perpendicularly to the frame base and fixes a tip portion of the hollow insulator unit;
a rear end fixing portion that is attached perpendicularly to the frame base and fixes a rear end portion of the hollow insulator unit,
the liquid tank is disposed on the frame such that a vertical height of a bottom surface of a liquid storage space of the liquid tank is higher than a vertical height of a top surface of the liquid storage space in the hollow insulator body when the hollow insulator unit to be fixed is in a horizontal state, on the rear end side of the rear end fixing portion.
Transport structure of hollow insulator unit . The rear end fixing portion is
a rear end fixing frame attached to a peripheral surface of the hollow insulator body, and a rear end support body that rotatably supports the rear end fixing frame around a rotation axis in a horizontal plane perpendicular to an axial direction of the hollow insulator unit.
A transport structure for an insulator unit according to claim 1. the first liquid hose is connected to the first flow path at a position above the liquid storage space in the hollow insulator body.
3. A transport structure for an insulator unit according to claim 1 or 2. a second liquid hose connected to a second flow path provided in the fixing metal fitting and enabling the insulating medium to flow out from inside the hollow insulator body;
the second liquid hose is connected to the second flow path at a position below a central axis of the hollow insulator unit.
3. A transport structure for an insulator unit according to claim 1 or 2. The liquid tank is connected to the hollow insulator body via a one-touch coupler.
A transport structure for an insulator unit according to claim 1. The frame base is capable of storing the insulating medium leaked from the insulating pipe body.
A transport structure for an insulator unit according to claim 1. The rack base is composed of a connection body made of a plurality of base members, and the connection portion has a partition wall having a height lower than the height of the side wall of the rack base extending in the longitudinal direction.
The transportation structure for an insulator unit according to claim 6. the hollow insulator unit includes an upper metal fitting on a tip end side of the hollow insulator body,
a sling is attached to an insertion member attached to the fixing metal fitting and the upper metal fitting, and the hollow insulator unit can be lifted by lifting the sling.
3. A transport structure for an insulator unit according to claim 2. an intermediate fixing portion for supporting an intermediate portion between the front end portion and the rear end portion of the insulator unit,
the intermediate fixing portion includes a middle portion support frame attached to a peripheral surface of the hollow insulator body and having a shape that can be adapted to a peripheral surface shape of the hollow insulator body , and a height adjustment portion that can adjust a height of the middle portion support frame ,
the tip side fixing portion has a tip portion fixing frame attached to a peripheral surface of an upper metal fitting of the hollow insulator unit,
the tip portion fixing frame is in multi-point contact with the circumferential surface of the upper fitting,
A transport structure for an insulator unit according to claim 1. a step of fixing the hollow insulator unit to the frame of the transportation structure for the hollow insulator unit according to claim 1;
connecting the hollow insulator body and the liquid tank;
and transporting the hollow insulator unit to a destination while the hollow insulator unit is fixed to the frame .
Method of transporting hollow insulator units. a step of fixing the hollow insulator unit in a vertical state to the frame of the transportation structure for the hollow insulator unit according to claim 2;
a step of rotating the hollow insulator unit around the rotation axis to move it to a horizontal state;
connecting the hollow insulator body and the liquid tank;
and transporting the hollow insulator unit to a destination while the hollow insulator unit is fixed to the frame .
Method of transporting hollow insulator units. The insulating tube body is transported in a state where the insulating medium is filled in the insulating tube body.
The method for transporting the hollow insulator unit according to claim 10 or 11 .