JPS6348411B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in a bushing mounting method and mounting device for a mobile transformer.

Generally, mobile transformers are used temporarily in place of substation transformers in the event of an accident or periodic inspection of an existing substation, or in the case of replacing substation equipment or major improvement work. The above mobile transformer is
As shown in Fig. 1, an oil tank 1 containing the contents of the transformer together with insulating oil is firmly attached to a trailer frame 2, and when in use, the high-pressure bushing 3 on the top of the oil tank 1 is removed from the oil tank due to height restrictions during transportation. 1, the mobile transformer 4 was moved to the site of use, and the high-voltage bushing 3 was assembled to the oil tank 1 at the site, and then the mobile transformer was used. However, since the mobile transformer 4 is used as an emergency replacement for an existing transformer, it is frequently moved from a storage location to a usage location and then to the next usage location. Each time the mobile transformer was moved, it was necessary to remove it from the oil tank 1 and reassemble it. Conventionally, when attaching the high pressure bushing 3 to the oil tank 1, for example, as shown in FIG. Ropes c and d are tied to b, the rope c on the head a side is connected to the upper end of the chain block 8 through the hook 7 of the crane 6, and the rope d on the base b side is directly connected to the lower end of the chain block 8,
First, the high-pressure bushing 3 is lifted up vertically by the crane 6 and removed from the storage box 5 in the inclined state stored in the storage box 5 as shown in FIG. 4A, and then the chain block 8 is Operate in the direction in which the load chain 9 is extended,
As shown in FIG. 4B, the high-pressure bushing 3 is gradually changed from an inclined state to a vertical state, and after the high-pressure bushing 3 is made vertical, it is lifted up to above the bushing mounting part 10 of the oil tank 1, and the high-pressure bushing The bushing 3 is lowered and its base b is housed in the bushing mounting part 10 via the bottomed cylindrical insulating shielding tube 11, and then the opening of the insulating shielding tube 11 is covered and fixed on the cover 12. The flange 14 of the high pressure bushing 3 is attached to the mounted mounting seat 13.
By tightening the bolts, high pressure bushing 3
was installed vertically above oil tank 1. Moreover, the installation of the high-pressure bushing 3 by the above-mentioned method involves first pulling out the high-pressure bushing 3 stored in an inclined state from the storage box 5 using the chain block 8 and the two ropes c and d, and then removing the chain block. Since the high-pressure bushing 3 had to be rotated vertically and installed in the oil tank 1 by slow operation, the installation work was very time-consuming and troublesome. In particular, when the high-pressure bushing 3 is turned vertically by operating the chain block 8, the high-pressure bushing 3 is hoisted by the crane 6 and suspended in the air, so if the chain block 8 is not operated carefully, the high-pressure bushing 3 will sway violently. However, as a result, there was a drawback that the chain block 8 became difficult to operate. Also, when removing the high-pressure bushing 3 from the oil tank 1, first lift it above the oil tank 1 using the crane 6, then lower it vertically, operate the chain block 8 in the opposite direction to the installation process, and hoist the load chain 9 to remove the high pressure. Since the bushing 3 had to be tilted at an angle that would allow it to be stored in the storage box 5, there was a problem similar to that at the time of installation. Furthermore, a chain block 8 is connected between the crane 6 and the high pressure bushing 3 in addition to the ropes c and d.
This required time and effort to operate and was extremely uneconomical. As described above, the conventional bushing installation method is time-consuming and labor-intensive, and it is not recommended as a bushing installation method for equipment that is frequently moved from one site to the next, such as a mobile transformer. Not optimal,
As mentioned above, various problems existed.

The present invention eliminates the above-mentioned drawbacks, and allows the installation and removal of high-pressure bushings to be quickly and easily carried out without requiring special effort and without the need for chain block operations. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention provides a method and apparatus for attaching bushings that can be carried out safely, and the present invention will be described below with reference to illustrated embodiments. Parts that are the same as before are indicated by the same symbols. 5 to 8, reference numeral 15 denotes a leg stand that rotatably supports the base b of the high-pressure bushing 3, and as shown in FIG.
It stands upright on the horizontal floor inside. Reference numeral 16 denotes a bottomed cylindrical storage cylinder that stores the base b of the high-pressure bushing 3. A flange 17 integrally provided around the outside of the upper open end of the storage cylinder 16 has a bearing fitting 1 on the leg base 15.
By fixing the connector 20 connected to the shaft 19 rotatably supported on the storage cylinder 1
6 is vertically installed between the leg stands 15, 15 without making sliding contact with the floor surface of the storage box 5. Reference numeral 21 denotes a plate-shaped support plate that stands upright above the storage box 5 so as to support the head a of the high-pressure bushing 3, and a semicircular incision (not shown in the figure) is provided in the center of the upper part of the support plate. , the head a of the high-pressure bushing 3 can be well supported. The high-pressure bushing 3 is assembled by inserting the base part b into the storage tube 16, tightening and fixing the collar part 17 and the flange 14 of the bushing with bolts 22, and supporting the head part a on the support plate 21. The high-pressure bushing 3 is stored in the storage box 5 at the same inclination angle as the storage box 5, as shown in FIG. In addition, high pressure bushing 3
Alternatively, a plurality of books may be stored in one storage box 5 in an inclined state in parallel as shown in FIG. 5, or one book at a time may be stored in the storage box 5. 23 is a cradle for the storage box 5 that stores the high-pressure bushing 3;
This pedestal 23 is arranged so that the head a of the bushing 3 faces diagonally upward as shown in FIG. Place and fix the storage box 5 so that it is. Then, the storage box 5 is loaded onto a mobile transformer vehicle or another vehicle and transported. 24 is a lid of the storage box 5, and a support plate 21a similar to the support plate 21 of the storage box 5 is provided. Reference numeral 25 denotes a suspension device, and as shown in FIGS. The supporting metal fitting 26 and this supporting metal fitting 26
a fixing bolt 27 that fixes the ends of each other, and a boss portion 28 that projects at the deepest part of the curved part of the support metal fitting 26 on the opposite side to the curved direction of the support metal fitting 26.
A mounting shaft 29 is formed integrally with the boss 28 at the protruding end of the boss 28, a stop bolt 30 is screwed onto the shaft end of the mounting shaft 29, and a lower end is rotatable on the mounting shaft 29. An arm rod 31 that is freely fitted, a triangular hanging fitting 32 whose base end is rotatably attached to the upper end of the arm rod 31, and a triangular hanging fitting 32 that is rotatable at the apex of the hanging fitting 32. The crane 6 is connected through the inverted U-shaped hangers 33 and the hangers 33 that are freely connected.
The suspension rope 34 is hooked on the hook 7 of the
One of the arm rods 31, 31 is rotatably connected to the mounting shafts 29, 29 of the support fittings 26, 26, and the arm rods 31,
31 is connected to a hanging metal fitting 32, and furthermore, the hanging metal fitting 32 is equipped with a hanging metal 33 through which a hanging rope 34 is passed through the apex of the hanging metal fitting 32, and the hanging metal fitting 32 is always provided in a vehicle on which the high-pressure bushing 3 is loaded. In addition, the supporting metal fittings 26, 2
There are supporting metal fittings 2 on the inner and upper surfaces of 6, respectively.
Cushioning materials 35, 35 made of rubber or the like are attached to prevent damage to the bushing 3 when the bushings 6, 26 are fastened to the high-pressure bushing 3. Further, the boss portions 28, 28 are provided with a length such that their tips protrude outward from the periphery of the umbrella portion of the high-pressure bushing 3 to prevent the arm rods 31, 31 from coming into contact with the bushing 3 and damaging it. There is.

Next, the case of attaching the high voltage bushing 3 to the bushing attachment part 10 of the oil tank 1 will be explained. The storage 5 containing the mobile transformer 4 and the high voltage bushing 3 is transported to the site of use, and then the lid 24 of the storage box 5 is closed. Inside the umbrella part of the head a of the high pressure bushing 3 which has been removed and stored at an angle in the storage box 5,
A pair of supporting metal fittings 26, 26 are held from the periphery of the head a so that a collar is fitted thereinto, and in this state, corresponding ends of the supporting metal fittings 26, 26 are fixed with fixing bolts 27. At this time, since the cushioning material 35 is provided on the inner surfaces of the supporting metal fittings 26, 26, the insulator tube portion of the high-pressure bushing 3 is not damaged at all. After this, the above support metal fitting 2
6, 26, arm rods 31, 31, hanging fittings 32,
A hanging device 25 consisting of a hanging metal 33 is attached to a hanging rope 3.
4 on the hook 7 of the crane 6. In this state, as shown in FIG. 6, when the crane 6 is moved in the direction of the arrow, the storage box 5 is
The high-pressure bushing 3, which is stored with an inclination at the same angle as , is rotated about the axis 19 of the storage cylinder 16 in the same direction as the moving direction of the crane 6.
As shown in FIG. 7A, it is raised upright in the storage box 5. While the high-pressure bushing 3 is maintained vertically by the crane 6, the high-pressure bushing 3
Remove the bolts 22 fixing the flange 14 and the flange 17 of the storage tube 16, and remove the high pressure bushing 3.
is lifted vertically by the crane 6 and moved to the required bushing attachment part 10 above the oil tank 1, and then the high-pressure bushing 3 is gradually lowered by the crane 6 so that its base part b is moved as shown in FIG. The high-pressure bushing 3 is inserted into an insulating shielding cylinder 11 vertically provided within the bushing mounting portion 10, and the high-pressure bushing 3 is made to stand upright on the mounting seat 13 via the flange 14.
Thereafter, the flange 14 is bolted to the mounting seat 13 to complete the initial installation of the high-pressure bushing 3. After that, remove the suspension fitting 25 from the head a of the high-pressure bushing 3 that has been installed above, and place it inside the storage box 5 on the high-pressure bushing 3 that will be installed next.
The remaining high-pressure bushings 3 are successively taken out from the storage box 5 and attached to the bushing mounting portion 10 of the oil tank 1 in the same operating order as described above. Also, after installing the high pressure bushing 3, the mounting seat 13
Insulating oil is applied to the insulating shield cylinder 11 from the oil inlet (not shown).

Next, when removing the high-voltage bushing 3 from the oil tank 1 when moving the mobile transformer 4, it is sufficient to perform the operation in the reverse order of the installation process. That is, after setting the suspension device 25 on the high-pressure bushing 3, the flange 14 is unfixed, the crane 6 is operated to temporarily lift the high-pressure bushing 3 above the oil tank 1, and in this state, the high-pressure bushing 3 is moved to above the storage box 5. Then, gradually lower the high-pressure bushing 3 and insert the base b into the housing cylinder 16. In this state, insert the flange 14 into the housing cylinder 16.
After tightening the bolts 22 to the flange 17, move the crane 6 in the direction opposite to the arrow in FIG. Part a is mounted on a support plate 21 and stored in a storage box 5. After storage, the suspension device 25 is removed and the storage box 5 is covered with the lid 24. Transport it together with the mobile transformer 4 to the next site of use.
Repeat the same operation as above to remove the high pressure bushing 3.
The installation and removal work is carried out.

Note that instead of fixing both ends of the supporting metal fittings 26, 26 to each other with the fixing bolt 27, one end is rotatably connected to each other with a connecting member such as a hinge, and only the other end is connected with the fixing bolt 27. Of course, it may also be something that is fixed in place.

As explained above, in the present invention, the high-voltage bushing 3 attached to the mobile transformer has its base plate b connected to the base 1.
5 is rotatably supported and stored in the storage box 5 at the same angle of inclination. On the other hand, when the high voltage bushing 3 is installed on the mobile transformer 4, a crane 6 and a crane 6 are attached to the head a of the high voltage bushing 3. The connected suspension device 25 is removably attached to the high pressure bushing 3.
is lifted vertically from the storage box 5 by operating the crane 6 around its base b, and then the high pressure bushing 3 is unfixed and the oil tank 1 is pulled out from the storage box 5.
The high-pressure bushing 3 is mounted vertically on the bushing mounting portion 10 of the oil tank 1 by being lifted vertically upward, and the present invention has the following effects.

When storing high-pressure bushings, the present invention stores and fixes the base of the bushing in a storage tube rotatably provided in a storage box, and the head is received and supported by a support plate so that the bushing is stored at the same angle as the storage box. For example, when high-pressure bushings are stored on their side, the nitrogen gas in the head of the bushing, which is sealed with insulating oil inside the bushing, is stored at an angle. By moving in the direction,
When the bushing is installed vertically on the transformer, when nitrogen gas moves toward the head of the bushing, some of it becomes bubbles and remains in the insulating oil or adheres to the wall inside the bushing. However, the presence of these air bubbles may deteriorate the electrical properties of the insulating oil, which is completely different from the case where the oil is used after a considerable amount of time has passed until the air bubbles disappear. Since the high-pressure bushing can be stored in advance at an angle so that it is always present on the internal nitrogen gas head side, there is almost no chance of nitrogen gas bubbles forming in the insulating oil when installing the high-pressure bushing. It can be immediately attached to a mobile transformer needed in an emergency, and equipment can be put into operation quickly.

Moreover, since the high-pressure bushing is rotatably stored in the storage box at an angle, it can be quickly and easily raised without placing any special burden on the bushing. Furthermore, the storage cylinder that stores the base of the bushing is vertically mounted on the base of the storage box so that it can rotate while maintaining a distance from the floor, and when the bushing is raised, it collides with the storage box and is damaged. Since the bushing is always held vertically when stored, the base of the bushing can be easily stored by lowering the bushing vertically and stored at an angle in a storage box. can do.

In addition, the suspension device used when hoisting a high-pressure bushing is such that a supporting metal fitting attached to it is sandwiched inside the umbrella part of the bushing, and the hanging device is attached to this supporting metal fitting and protrudes outward from the inside of the umbrella part. An arm rod rotatably attached to a shaft is hung on a crane, and the arm rod is pulled by the crane so that the bushing can be lifted out of the storage box around the pivot portion of the storage tube. Therefore, when lifting the bushing, the arm rod sequentially pulls up the bushing on the outside of the bushing's umbrella, and gradually rotates parallel to the bushing so that the bushing can be lifted by the crane, thereby preventing damage to the bushing. The bushing can be pulled up and lifted smoothly without any local pressure on a part of the bushing that impairs its function.

Furthermore, as described above, the present invention stores the high-pressure bushing tilted so as to be rotatable, and when lifting the bushing, the support metal fitting clamped to the bushing and the arm attached to this metal fitting are hung on the crane. By using a hanging bracket with a simple structure consisting of rods, it is possible to significantly reduce the time required to install and remove bushings for mobile transformers that are frequently moved from site to site. can be handled quickly by using the above-mentioned suspension device and crane in combination.
This can be done safely without requiring any special effort, and together with the fact that the bushing installation work can be done easily, the efficiency of use of the mobile transformer can be significantly increased.

As described above, the present invention effectively utilizes commonly commercially available materials for the installation, removal, and storage of high-voltage bushings in mobile transformers without the need for specially constructed suspension devices or storage boxes. By using these parts, the handling of high-pressure bushings can be done quickly and efficiently without damaging the functions of the bushings.
It has many excellent effects, such as being able to be performed safely.

[Brief explanation of drawings]

Figure 1 is a side view of the mobile transformer, Figure 2 is a vertical cross-sectional view of the main part showing how the bushing is installed, Figure 3 is a cross-sectional view showing the conventional bushing storage state, and Figures 4 A and B are conventional Fig. 5 is a cross-sectional view showing the bushing of the present invention in a stored state, Fig. 6 is a cross-sectional view showing the state in which the bushing of the present invention is being installed, and Fig. 7 is a cross-sectional view showing the bushing in the middle of being installed. Figure 7A is a side view; Figure 7A is a side view;
Figure B is a front view of the main parts, Figure 8 is a sectional view of the storage tube that houses the base of the bushing, Figure 9 shows the main parts of the suspension device, Figure 9A is a plan view, and Figure 9A is a plan view. B is a front view, and FIG. 10 is a perspective view showing the arm of the suspension device. 1... Oil tank, 3... High pressure bushing, 5... Storage box, 15... Leg stand, 16... Storage tube, 25...
suspension equipment,

Claims (1)

[Claims] 1. When moving a transformer with an oil tank 1 containing the contents of the transformer loaded on a trailer frame 2, the high voltage bushing 3 is removed from the oil tank 1, and the high voltage bushing 3 is removed from the oil tank 1 at the site where the transformer is used. In the portable transformer in which the transformer can be used by attaching the bushing 3 to the oil tank 1, the high voltage bushing 3 is attached to a storage cylinder rotatably attached to the lower foot stand 15 inside the storage box 5 when the high voltage bushing 3 is stored. The base b is housed and fixed in the storage box 16, and the head a side is tilted and supported by a support plate 21 provided above inside the storage box 5 so that the head a faces upward. When installing the high pressure bushing 3, A suspension device 25 to which an arm rod 31 is rotatably attached is clamped to the inside of the umbrella portion of the head a of the high-pressure bushing 3, and this suspension device 25 is hung on the crane 6 via the arm rod 31. This crane operation moves the high pressure bushing 3 to the footrest 15.
The high voltage bushing 3 is lifted up vertically from the storage box 5 via the storage cylinder 16 pivoted to the storage cylinder 16. In this state, the high voltage bushing 3 and the storage cylinder 16 are unfixed, and the high voltage bushing 3 is lifted up to the bushing mounting portion 10 of the mobile transformer. A method for installing a bushing in a mobile transformer, characterized in that the bushing is installed perpendicularly to a mobile transformer. 2. When moving the transformer with the oil tank 1 containing the contents of the transformer loaded on the trailer frame 2, remove the high pressure bushing 3 from the oil tank 1, and attach the high pressure bushing 3 to the oil tank 1 at the site where the transformer is used. In the mobile transformer in which the above-mentioned transformer can be used, the storage box 5 of the high-voltage bushing 3 is placed on the pedestal 23 at a required angle of inclination, and a leg pedestal 15 is provided at the lower inside of the storage box 5. The storage box 16 that stores the base part b of the high-pressure bushing 3 is pivoted on this foot stand 15 so that its lower end can rotate freely without coming into sliding contact with the floor surface of the storage box 5. In the upper part of the inside of the storage box 5, there is a head a of the high pressure bushing 3.
The high-pressure bushing 3 is mounted on the storage box 5 with the support plate 21 supporting the
In this case, the base b is housed and fixed in the storage tube 16 and placed between the leg stand 15 and the support plate 21 at the same inclination angle as the storage box 5, and the high-pressure bushing 3 is suspended. The device 25 includes a collar-shaped support fitting 26 that removably holds the inside of the umbrella portion of the head a of the high-pressure bushing 3, a pair of mounting shafts 29 that protrude from the outer periphery of the support fitting 26 in opposite directions, and The arm rod 31 is rotatably attached to the shaft 29 and connected to the crane 6 via a suspension rope 34. 25 is clamped to the high-pressure bushing 3, this suspension device 25 is hooked to the crane 6, and the high-pressure bushing 3 is rotated about the footrest 15 and vertically pulled out from the storage box 5. This bushing mounting device for a mobile transformer is characterized in that a high-voltage bushing 3 is unfixed from a storage cylinder 16, lifted vertically above an oil tank 1, and mounted on a bushing mounting part 10 of the oil tank 1.