JPS60235313A - Oil-immersed capacitor bushing in oil - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to an oil-in-oil system for connecting Hiji wires to cables, etc. in oil-immersed electrical equipment such as transformers and reactors. This relates to the configuration of paper-immersed capacitor pushing.

[Prior art]

For oil-filled electrical equipment such as transformers and reactors, the method of connecting the Hiji line to cables submerged in oil is often employed in underground substations in urban areas.

In this case, reducing the installation volume is an essential condition.
Although various improvements have been made, it is customary to provide a partition between the inside of the electrical equipment and the connection between the cable and the insulating oil so that the insulating oil flows between them. is used. There is a strong demand for this bushing to be made smaller due to the need to reduce the installation volume.
Oil-immersed paper capacitor bushings with a center clamp type that have the same structure as oil-immersed pushing bushings are often used.

The center clamp type oil-immersed paper capacitor pushing for air-to-oil use has the same basic structure as the general air-to-oil use, except that the air insulator tube is changed to be for use in oil. Metal fittings are required to secure the insulator.

FIG. 1 is a sectional view showing an example of a conventional oil-immersed paper capacitor bushing. In the figure, (1) is the central pipe, (2) is the capacitor part with electric field adjustment electrodes inserted in a concentric cylindrical shape at appropriate positions using oil-impregnated paper as an insulating material, (
3) is a mounting flange, (3a) is a conservator for alleviating abnormal pressure due to volume change of insulating oil in case of horizontal mounting method, (4) is cable side insulator tube, (5) is transformer side insulator tube, ( 4a), (4b), (5a), (5b)
(6) is a metal fitting for fixing the transformer side insulator tube (5), (7) is an expansion cylinder, (3) is a metal fitting for fixing the transformer side insulator tube (5), ) uses the central nokukuibu (1) as a tension member, and each insulator tube (4) (5
) Compression spring for applying compression force to the mounting flange (3), (9) is a spring stop plate that presses the compression spring (8), αq
is a ring nut for fixing the compression force of the compression spring (8), and αυ is the expansion/contraction difference between the center pipe (1) and the outer peripheral insulator pipes (4) (5) and lunge (3) due to temperature changes during use. bellows to maintain the sealed structure even when
) is a terminal, (12a) is a gasket to maintain the seal of the mounting part of terminal (2), and (2) is an oil-immersed shield to alleviate electric field concentration around the expansion tube (7) and the terminal. , ami is an oil-immersed shield to alleviate electric field concentration around the fixing fitting (6), (c) is a valve, and αφ is a terminal end for connecting a lead from the electrical equipment body (not shown). .

The oil-immersed paper capacitor bushing for oil-submerged use has this structure by inserting the center pipe (1) around which the capacitor part (2) is wrapped into the mounting flange (3), and inserting the transformer side insulator pipe ( 5), screw the fixing fitting (6) into the right end of the center pipe (1) through the gasket (5b) and seal it by soldering, etc., and attach the gasket (4b) to the left side of the mounting flange (3). cable through the side insulator tube (
4) and insert the expansion cylinder (4a) through the gasket (4a).
7), insert the compression spring (3) and spring stopper plate (9), compress the compression spring (3), and use the center pipe (1) as a tension member to connect the insulator pipes (4) and (5) to the mounting flange (3). ) and fix it with ring nut αq. A bellows αη with a base is provided at the left end, and the joint is hermetically fixed by soldering or the like. Next, the mounting flange (3)
Vacuum is drawn through the valve αO provided at Enclose active gas at appropriate pressure.

While installed on the transformer, connect the terminal end 0 frame to the connection wires of the coil force 1 and the like by brazing or crimping, and screw and fix it to the bottom surface of the terminal (2).

The oil-immersed paper condenser bushing assembled in this way has a fixing fitting (6〉) for applying compressive force to the insulator tube (4) (5), an expansion S (7), and a housing inside the bushing. Compression spring (8) Other parts are required, and the size of the charging fitting part is large, so installing it on the transformer to ensure the required insulation distance will result in considerably large dimensions and force υ, and the entire device will be large. Furthermore, in the case of horizontal installation, there is no need for a conservator (3a) at the mounting flange to relieve abnormal pressure. This was developed with the aim of reducing the diameter of the live part of the bushing so that it could be made smaller and more compact.In other words, the material of the insulator pipe was made oil resistant.

It is manufactured from a flexible material with good heat resistance and electrical insulation properties, and is fitted into the mounting flange and the center pipe for sealing. It is designed to be compact and has a structure that allows absorption in only one part.

[Embodiment of the Invention] FIG. 2 is a sectional view showing an embodiment of the invention. In the figure, (21) is the center pipe, (22) is the capacitor section whose insulating material is oil-impregnated paper into which many concentric cylindrical electric field adjustment electrodes are inserted, and (23) is the mounting flange at both ends. The outer diameter of the outer diameter is the removable insulator tube (24) (25
) has a smooth finish for easy insertion and sealing. (ZSa) and (23b) are the capacitor part (
The ring screw for inserting and fixing 22) into the mounting flange (23) is provided with a hole or groove so that the insulating oil (27) can flow in the axial direction. (24) is a cable-side insulator tube made of a flexible material with good oil resistance, heat resistance, and electrical insulation properties such as polypropylene, and is corrugated as shown in the figure to improve its elasticity. ) is a transformer side insulator tube made of the same material as the cable side insulator tube (24), (24a)
(2) is a binding band such as FRB to ensure the sealing between the center pipe (21) and the cable side insulator (24);
4b) is attached with the band of the mounting flange (23) @, (2
5a) and (F5b) are bands having the same functions as bands (24a) and (241)), respectively. (26) is a terminal with the function of drawing the lead wire from the transformer coil into the center pipe (21) and isolating the insulating oil (27) between the cable side and the transformer side, (26a) is the transformer coil Lead wire from (2'7a) is the mounting flange (23)
and the outer periphery of the capacitor part (22).
This is a gap created to allow free flow of water.

In the bushing of this structure, first, a capacitor part (22) is installed in the center pipe (21), the outer shape is machined as shown in the figure, and the mounting flange (23) is inserted and fixed with ring screws (23-) and (23b). Next, the cable side insulator tube (24)
Insert the transformer side insulator pipe (25) and attach the band (2
4a) (24b) (25a) (25'N) is wrapped, vacuum is drawn through the valve (G) provided on the mounting flange (23), and the insulating oil (27) is filled and assembled. Installed on the transformer. Connect the terminal (26) to the tip of the lead wire (26a) from the coil by brazing or crimping the center pipe (
21) Pull the gasket (261) into the position shown.
) and screw in the ring nut (26c) to secure the bill.

With the above configuration, even if the center pipe (21) expands or contracts due to temperature changes while the bushing is in use, the cable side insulator tube (24) and the transformer side insulator tube (25) themselves expand and contract to absorb the expansion and contraction. However, the sealed structure is maintained. Volume changes due to temperature changes in the insulating oil (27) filled in the Ota bushing are caused by changes in the volume of the insulating oil (27) filled in the Ota bushing.
Due to the shape of the waveform in 5), when the temperature rises, the large diameter part expands and the small diameter part contracts.The volume inside the shipping is F! It changes according to the volume change of the edge oil (27), hardly any pressure change occurs inside the bushing, and moreover, sealing is ensured without creating a space. Therefore, a conservator is not required even for horizontal installation.

Furthermore, the diameter of the live part metal is the diameter of the center pipe (21), which is much smaller than in the conventional system.Even if the required insulation distance is secured between the tank and the wall, the tank dimensions will be much smaller. In addition, if the voltage is high, as shown in Figure 3, the tip of the bushing and the surface of the lead wire (26a) or terminal (26) may be taped with insulating paper (2B). If you reinforce it, even more N! It is possible to shorten the edge distance, make the equipment more compact, and make it lighter as a bushing for vertical use.

Can be used regardless of horizontal use.

〔Effect of the invention〕

As explained above, this invention makes the insulators on both sides oil-resistant and
The center pipe is made of a removable material with good heat resistance and insulation properties, and the expansion and contraction due to temperature changes at the outer periphery can be absorbed by the insulator pipe, making it possible to downsize the device. There is an effect.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing the structure of a conventional oil-immersed paper capacitor bushing for use in oil-in-oil, and FIG. 2 shows the structure of an oil-immersed paper capacitor bushing for use in oil-in-oil according to an embodiment of the present invention. FIG. 4 is a cross-sectional view showing the configuration of an oil-immersed paper capacitor for use in oil-in-oil in another embodiment of FIG. 3; In the figure, (21) is the center pipe, (22) is the capacitor part, (23) is the mounting flange, (24) (25)
) is an insulator, and (27) is an insulating oil. In addition, the same symbols in the figures indicate the same or equivalent parts ○ Agent Masuo Oiwa

Claims (2)

[Claims] (1) A capacitor part made of oil-impregnated paper as an insulating material is provided around the center pipe to adjust the electric field, and a mounting flange is placed in the middle part and insulator pipes are placed on both sides of this mounting flange to seal it and insulate the inside with insulating oil. In an oil-immersed oil-immersed paper capacitor bushing in which the surrounding insulating medium is insulating oil, the insulator tubes on both sides are made of a flexible material that is oil-resistant, heat-resistant, and has good insulation properties. An oil-immersed paper capacitor bushing for use in oil and oil. (2) The oil-immersed paper condenser bushing for submerged oil-in-oil according to claim 1, wherein the insulator tube is formed into a corrugated shape to provide elasticity.