JPH06290963A - Electrical equipment - Google Patents

Abstract

PURPOSE:To compact an electrical equipment, and to improve reliability on insulation while transport parts are decreased and assembly in a field is facilitated by vertically arranging a bushing. CONSTITUTION:Intermediate pressure leads 3 connected to divided unit transformers 1A, 1B are housed in a duct 10 on the transformer side. The intermediate pressure leads 3 are connected to one of bushings 5, the other of the bushings 5 is connected to a gas insulated bus 14, and the both bushings are covered with a grounding tank. The bushings 5 are arranged to the vertical section of the T-shaped duct 10 at that time. At least one or both of the leads of the bushings 5 connected to the transformer side or the gas insulated bus 14 side are arranged in the rectangular direction to the axial direction of the bushings 5. Accordingly, an electrical equipment, which is compacted while transport is facilitated and has high reliability on insulation, can be realized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric device for connecting an oil-filled electric device such as a transformer or a reactor with a gas-insulated device.

[0002]

2. Description of the Related Art In recent years, due to rising land prices in cities and the like, power supply sites such as power plants are often constructed at locations away from power demand sites. Therefore, UHV power transmission has recently been studied as a power transmission from a remote distance. UH
In V transmission, substations are often constructed in the mountains, and transformers used in such substations are manufactured within the strict transportation restrictions as in the past, but have high voltage and large capacity. Therefore, a split type transformer in which a three-phase transformer is divided is being considered.

Such a split type transformer will be described with reference to FIG. FIG. 3 is a plan view of a single-phase transformer for one phase of a conventional split type transformer. In the figure, the single-phase transformer is composed of unit transformers 1A and 1B, which are arranged in parallel so that the longitudinal directions of the tanks 6 of both unit transformers face each other, and are further covered with a soundproof wall (not shown). ing. Each unit transformer 1A, 1B is composed of a tank 6, a three-leg iron core 7 installed in the tank 6, and a winding 8 wound around each leg of the three-leg iron core 7. Further, the high voltage lead 2 is drawn out from the central portion of both windings 8 and is provided in a substantially T-shaped duct 9 provided at substantially the same height on the side surfaces of the tanks 6 of both unit transformers facing each other. It is housed and arranged in a substantially horizontal position, and is connected to the high pressure bushing 4 at the horizontal portion. Reference numeral 11 is a duct on the gas bus side.

On the other hand, as shown in FIG. 2, the medium-voltage lead 3 is pulled out from the upper portions of the surfaces of the tanks 6 of both unit transformers facing each other, is housed in the duct 10, and is arranged horizontally at substantially the same height. And is connected to the medium pressure bushing 5 at its horizontal portion.

[0005]

However, the conventional substation equipment constructed as described above has the following problems. The duct from the transformer and the gas-insulated busbar are connected via a bushing, and the transformer and the gas-insulated busbar are connected horizontally. Since the high pressure side is pulled out from the central portion of the side surface of the tank, the bushing is arranged horizontally. However, since the medium pressure side is pulled out from the upper part of the tank, once lower it with an oil duct to the lower part, connect it to a gas insulation device via a bushing in the horizontal duct part, or draw it horizontally at the upper part like the high pressure side, After connecting to gas-insulated electrical equipment with a bushing, it is configured to be lowered to the lower part with a gas duct. Therefore, since there is a duct part that is pulled down at the part connected to the bushing, there is a drawback that the duct length becomes long. Also, since the duct length becomes longer,
Insulation reliability could also be reduced. Furthermore, since the bushing is arranged horizontally, there is a concern that the insulation reliability will be impaired if foreign matter should enter.

The present invention has been made in view of the above circumstances, and an object thereof is to improve a bushing arrangement for connecting a lead of a transformer and a gas-insulated bus bar to improve compactness and reliability of insulation, and to improve transportation reliability of a transportation component. It is to provide electrical equipment that is easy to reduce and assemble locally.

[0007]

In order to achieve the above object, the present invention provides an electric device for connecting a gas-insulated electric device in which two or more oil-filled electric devices such as an oil-filled transformer and a reactor are arranged in parallel by a bushing. In the above, the bushing is arranged vertically.

[0008]

According to the present invention, the bushing for connecting the lead of the transformer and the gas-insulated busbar is arranged at the connecting portion of the connecting T pipe of the unit transformer, and the bushing is attached to the vertical pipe portion. By doing so, it is possible to minimize the size, and by attaching the connecting flange to the T-shaped conduit portion of the connecting portion, it is possible to integrally transport the bushing, and it is possible to reduce the assembly work time at the site. Insulation reliability can be improved.

[0009]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a side sectional view of an embodiment of the present invention, and FIG. 2 is a schematic view of a bushing portion connecting the high voltage and medium voltage leads of the transformer of FIG. 1 and a gas insulated busbar. The same parts as those of the conventional example are designated by the same reference numerals, and the description thereof will be omitted.

In FIG. 1, reference numeral 10 denotes a transformer-side duct, in which an intermediate voltage lead 3 connected to the divided unit transformers 1A and 1B is housed. The medium pressure lead 3 is connected to one side of the bushing 5, and the other side of the bushing 5 is connected to the gas-insulated busbar 14 and is covered with a ground tank. At this time, the bushing 5 is T
It is arranged in the vertical portion of the mold duct 10. At least one or both of the leads of the bushing 5 connected to the transformer side or the gas-insulated bus bar 14 side are arranged in a direction perpendicular to the axial direction of the bushing 5. Further, a foreign matter capturing device 13 is provided below the gas side duct 12 to prevent the insulation performance from being deteriorated due to the mixture of foreign matter. Also,
The transformer-side duct 10 and the gas-insulated equipment-side duct 12 that are connected to the bushing 5 are mounted on the bushing so that they can be transported. , 16 are attached.

The present embodiment thus constructed has the following operational effects. By arranging the bushing 5 vertically on the T-shaped duct 10 on the transformer side, the overall configuration is made compact, and even if foreign matter should enter the bushing on the oil side, it will fall onto the bushing flange 15 portion. Therefore, it does not exist in the high electric field,
Insulation reliability is improved. Further, by arranging the leads connected to the transformer or the gas-insulated equipment in a direction perpendicular to the axial direction of the bushing 5, it is possible to make the arrangement according to the installation height of the gas-insulated equipment. Further, since the flanges 15 and 16 are provided on the transformer duct side and the gas duct side within the transportation limit dimensions, it is possible to transport the bushing 5 and the flanges 15 and 16 as a unit after they are assembled and tested in the factory once. Therefore, it is possible to reduce the assembling time at the site, which in turn improves the insulation reliability.

By the way, the present invention is not limited to the above configuration, but can be modified as follows. For example, by making the bushing vertical so that the lower part of the bushing on the gas insulation device side faces the bottom surface of the duct, and by providing a foreign matter trap device at the bottom of the tank, insulation reliability is further improved. In addition, by installing a solid insulator for supporting the lead between the duct and the bushing through the bushing, the high-voltage lead connected to the bushing on the gas side should mechanical force be applied to the lead in the event of an external accident. Since the force in the bending direction applied to the bushing can be alleviated, the reliability can be improved.

[0013]

As described above, according to the present invention, the bushing for connecting the transformer side and the gas-insulated equipment side is arranged in the vertical portion of the transformer-side duct to achieve compactness and transportation. It is possible to provide an electric device that is easy and has high insulation reliability.

[Brief description of drawings]

FIG. 1 is a side view of an embodiment of the present invention.

FIG. 2 is a schematic view of a bushing portion connecting high-voltage and medium-voltage leads of the transformer of FIG. 1 and a gas-insulated bus bar.

FIG. 3 is a plan view of a conventional split type transformer.

FIG. 4 is a view seen from the Y direction in FIG.

[Explanation of symbols]

1A, 1B ... Unit transformer, 2 ... High voltage lead, 3 ... Medium voltage lead, 4,5 ... Bushing, 6 ... Tank, 7 ... Iron core, 8
... Winding, 9, 10, 11, 12 ... Duct, 13 ... Foreign substance capturing device, 14 ... Gas insulated busbar, 15, 16 ... Flange.

Claims (1)

[Claims] 1. In an electric device in which two or more oil-filled electric devices such as an oil-filled transformer and a reactor are arranged in parallel and connected to a gas-insulated electric device by a bushing, the bushing is arranged vertically. Electrical equipment.