JP2006211765A - Transformer device installed on-road - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transformer device installed on a road capable of electrically connecting a transformer with a switch without using a cable with a connector. <P>SOLUTION: The transformer device is provided with the transformer 1 and the switch 2 in which insulation oil is filled. An output side bushing 3 is mounted on a bushing mount seat 4 provided in a switch case 22 for accommodating a switch body of the switch 2 with a first seal member 7 intervened. The output side of the output side bushing 3 is pulled into a transformer tank through a tank opening portion 11a provided at a side surface of the transformer tank 11 in which a transformer body of the transformer is accommodated. The bushing mount seat is mounted on the side surface of the transformer tank 11 with a second seal member 9 intervened. The switch body is electrically connected with an input terminal portion 3b of the output side bushing with the switch 2 attached on the potential transformer through the bushing mount seat, thus substantially and electrically connecting an output terminal portion 3c of the output side bushing with the transformer body. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a road-mounted transformer device including a transformer filled with insulating oil and a switch.

  The on-road transformer device includes a transformer, a switch, and the like, and is housed in an outer box. The transformer body is configured by housing the transformer body together with insulating oil filled in the transformer tank. The switch includes a switch main body housed in a switch case.

The switch case is generally arranged separately from the side surface of the transformer tank, and the transformer and the switch are provided on the output side provided in the switch case as disclosed in Patent Document 1. The bushing and the primary side bushing provided in the transformer case are electrically connected by connecting the output side connector-attached cable in which the connector and the insulated cable are combined.
JP-A-5-258966

  When the switch and the transformer are electrically connected, the cable with the connector as described above has a problem of increasing the cost because it is necessary to provide the switch and the transformer with a bushing suitable for the connector. In addition, since the connector and cable are used, it is necessary to secure a space according to the shape of the bushing and the connector, and it is necessary to secure a space by appropriately arranging the cable, which hinders downsizing of the road-mounted transformer device. There is a problem that occurs.

  An object of the present invention is to provide a road-mounted transformer device in which a transformer and a switch are electrically connected without using a cable with a connector.

  A first invention is directed to a road-mounted transformer device including a transformer filled with insulating oil and a switch, and a bushing mounting seat provided in a switch case housing a switch body of the switch In addition, an output side bushing is attached with a first seal member interposed therebetween, and the output side of the output side bushing passes through a tank opening provided on a side surface of the transformer tank that houses the transformer body of the transformer. The bushing mounting seat is attached to the side of the transformer tank with the second seal member interposed between the switch body and the output side with the switch attached to the transformer via the bushing mounting seat. The input terminal part of the bushing is electrically connected, and the output terminal part of the output side bushing and the transformer body are substantially electrically connected.

  According to a second aspect of the present invention, the switch is a gas switch, the first seal member is composed of an oil seal member and a gas seal member, and the second seal member is composed of an oil seal member. It is a thing.

  As described above, according to the first invention, the output-side bushing enters the transformer tank, and the switch case is attached to the side surface of the transformer tank via the bushing mounting seat. It becomes unnecessary and can be manufactured compactly without increasing the cost.

  According to the second invention, since the sealing by the first sealing member is performed by the oil sealing member and the gas sealing member in a double manner and the sealing by the second sealing member is performed by the oil sealing member, It can be configured using a switch.

FIG. 1 is a schematic configuration diagram showing an embodiment of a road-mounted transformer device according to the present invention. As shown in the figure, a transformer 1, a switch 2, etc. are provided and accommodated in an outer box 3, and the transformer 1 is configured by accommodating a transformer body (not shown) in a transformer tank 11. The switch 2 is configured by accommodating a switch body (not shown) in a switch case 22, and the switch case 22 is attached to the side surface of the transformer tank 11. Connected to the switch 2 is a cable 10 with an input-side connector drawn into the outer box 3. The transformer tank 11 is filled with mineral oil or the like as insulating oil, and the switch case 22 is filled with SF ₆ gas or the like as insulating gas.

  FIG. 2 is a schematic configuration diagram showing a main part of an embodiment of a road-mounted transformer device according to the present invention. As shown in the figure, one of the side surfaces of the switch case 22 is provided with a case opening 22a in order to provide the output-side bushing 3, and the bushing mounting seat 4 is provided around the outer periphery of the opening 22a. It is welded and attached.

  As shown in FIG. 3, the bushing mounting seat 4 is formed of a rectangular plate material, and is provided with bushing through holes 4a, 4b, 4c for mounting the output-side bushings 3 for three phases.

  The output-side bushing 3 has a circular support plate 3a extending in the direction perpendicular to the longitudinal direction at the center in the longitudinal direction, and the rod-like portion is passed through the bushing through-holes 4a (4b, 4c). Then, the holding plate 5 provided on the side of the transformer tank 11 of the bushing mounting seat 4 is fastened with bolts 6 and the support plate 3a is sandwiched between the bushing mounting seat 4 and the holding plate 5 so that the bushing mounting seat 4 It is attached. Thus, the production of the switch 2 to which the output side bushing 3 is attached is completed.

  The holding plate 5 has the same shape as the bushing mounting seat 4 shown in FIG. 3, and is provided with a through hole for the bushing 3 and a through hole for the bolt 6.

  In order to screw the bolts 6, screw holes 4 d are provided around the bushing through holes 4 a, 4 b, 4 c of the bushing mounting seat 4 as shown in FIG. 3.

  In order to attach the output-side bushing 3 in a sealed state by the first seal member 7, the bushing attachment seat 4 has first and second groove portions 4e and 4f supported by the bushing attachment seat 4 as shown in FIG. The bushing mounting seat 4 that overlaps the plate 3a is formed so as to draw a double circle along the periphery of the bushing through holes 4a, 4b, 4c, and the second positions located outside and inside the double circle. As shown in FIG. 4, the cross-sectional shapes of the first and second groove portions 4e and 4f are formed in a U shape and an L shape, respectively. A ring-shaped oil seal member 7a is accommodated in the first groove 4e, and a ring-shaped gas seal member 7b is accommodated in the second groove 4f. Further, as shown in FIG. 4, in a state where the output side bushing 3 is attached, the first seal member 7 is pushed from the bushing through hole 4a so as to be pushed by the surface of the support plate 3a on the switch case 11 side. A drop portion 4g for allowing the support plate 3a to enter is formed across the first and second groove portions 4e and 4f.

The oil seal member 7a needs to have chemical stability sufficient to withstand the insulating oil, and needs physical properties that can withstand the temperature rise of the insulating oil. For example, NBR (acrylonitrile butanediene rubber) Consists of. The gas sealing member 7b requires a property excellent in SF ₆ gas resistance and is made of, for example, EPT (ethylene / propylene rubber).

  One of the side surfaces of the transformer tank 11 is provided with a tank opening 11a for allowing the output-side bushing 3 to enter the transformer tank 11, and the bushing mounting seat 4 has an outer peripheral edge of the tank opening 11a. By tightening with the bolt 8, the output-side bushing 3 is attached in a state of entering the transformer tank 11. Thus, the attachment of the switch 2 to the transformer 1 is completed.

  In order to screw the bolts 8, screw holes 4 h are provided in the peripheral edge portion of the bushing mounting seat 4 as shown in FIG. 3.

  In order to attach the bushing mounting seat 4 to the hermetically sealed state by the second seal member 9, the bushing mounting seat 4 has a third groove 4i formed between the bushing mounting seat 4 and the transformer tank 11, as shown in FIG. It is formed along the periphery of the bushing mounting seat 4 at the overlapping portion, and its cross-sectional shape is formed in a U shape. For example, a ring-shaped oil seal member made of the same NBR as described above is accommodated in the groove 4i.

  The switch 2 is electrically connected to a switch body (not shown) and an input terminal portion 3b of the output side bushing 3, and the transformer 1 is a primary of the output terminal portion 3c of the output side bushing 3 and a transformer body (not shown). The side windings are electrically connected via a fuse (not shown) or directly connected without a fuse.

In the embodiment described above, two oil seal members 7a and 7b are used as the first seal member 7, and the stability of the seal against insulating oil and SF ₆ gas is significantly improved and maintained. However, the number of the first sealing members 7 may be one as long as both the stability of the seals against these can be maintained.

  Moreover, in the said embodiment, although the switch 2 was used as the gas switch, it may be an air switch. In this case, only the oil seal member 7a may be used as the first seal member 7.

It is a schematic structure figure showing an embodiment of a road installation type transformer device concerning the present invention. It is a schematic block diagram which shows the principal part of embodiment of the road installation type transformer apparatus which concerns on this invention. It is the front view which looked at the bushing mounting seat used for the road installation type transformer apparatus which concerns on this invention from the transformer side. It is sectional drawing which shows the state by which the output side bushing was attached to the bushing attachment seat used for the road installation type transformer apparatus which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Transformer 11 Transformer tank 11a Tank opening 2 Switch 22 Switch case 3 Output side bushing 3b Output side bushing input terminal part 3c Output side bushing output terminal part 4 Bushing mounting seat 7 First seal member 7a Oil Seal member 7b Gas seal member 9 Second seal member (oil seal member)

Claims (2)

In a road-mounted transformer device comprising a transformer filled with insulating oil and a switch,
An output side bushing is attached to a bushing mounting seat provided in a switch case housing the switch body of the switch with a first seal member interposed therebetween,
The output side of the output side bushing is drawn into the transformer tank through a tank opening provided on a side surface of the transformer tank that houses the transformer body of the transformer,
The bushing mounting seat is attached to the side surface of the transformer tank with a second seal member interposed therebetween,
In a state where the switch is attached to the transformer via the bushing mounting seat, the switch body and the input terminal part of the output side bushing are electrically connected, and the output terminal part of the output side bushing; A road-mounted transformer device that is substantially electrically connected to the transformer body. 2. The switch according to claim 1, wherein the switch is a gas switch, and the first seal member includes an oil seal member and a gas seal member, and the second seal member includes an oil seal member. The street-mounted transformer device as described.

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