JP5974497B2 - Bus bar bushing - Google Patents

Description

  Embodiments of the present invention relate to a bus bushing in which a main circuit conductor is molded with an insulating material.

  Conventionally, in a solid-insulated switchgear, an electrical member such as a main circuit conductor is molded with an insulating material such as an epoxy resin to reduce the overall shape. In order to increase the capacity, one that increases the cross-sectional area of the main circuit conductor is known (for example, see Patent Document 1).

  When the cross-sectional area of the main circuit conductor embedded in the insulating material is increased, the weight of the main circuit conductor is added to the insulating film, and the bus bushing itself becomes a heavy object, which makes assembly work difficult. In particular, the inter-board busbars connecting the panels placed in a row are often arranged at the top of the storage equipment, and work is required at high places, so the bus bushings connecting the inter-board busbars can be reduced in weight. It was desired.

JP 2006-197730 A

  The problem to be solved by the present invention is to make it possible to reduce the weight and increase the capacity of a bus bushing that connects buses between boards. As a matter of course, the bus bushing is configured such that the main circuit conductor is molded with an insulating material.

In order to solve the above-described problems, the bus bushing according to the embodiment is configured such that a T-shaped handle is connected to a first central conductor connected to a storage device and a T-shaped head of the first central conductor. A plurality of second center conductors that are fixed and have interface connection portions for interface-connecting the inter-board bus bars , and an insulating layer provided around the first center conductor and the second center conductor characterized by comprising and.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. The front view which shows the structure of the bus-line bushing which concerns on Example 1 of this invention. Sectional drawing seen from the upper surface which shows the structure of the bus-line bushing which concerns on Example 1 of this invention. The front view which shows the structure of the bus-line bushing which concerns on Example 2 of this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

  First, the bus bushing according to the first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a side view showing the configuration of a lined solid-insulated switchgear according to Embodiment 1 of the present invention, FIG. 2 is a front view showing the configuration of a bus bushing according to Embodiment 1 of the present invention, and FIG. These are sectional drawings seen from the upper surface which show the composition of the bus bar bushing concerning Example 1 of the present invention.

  As shown in FIG. 1, storage devices 2a, 2b, and 2c such as circuit breakers are respectively stored in the box bodies 1a, 1b, and 1c arranged in a row. Bus bushings 3a and 3b are respectively provided on the upper portions of the storage devices 2a, 2b and 2c, and the inter-board buses 4a and 4b are interface-connected. An insulating plug 5 is provided on the bus bushing 3a at the end. The bus bushings 3a and 3b have the same configuration and will be described below using one of them.

  As shown in FIGS. 2 and 3, the bus bushing 3 a is provided with an insulating layer 7 in which an epoxy resin is molded around a T-shaped first central conductor 6 that becomes a main circuit conductor. The T-shaped handle portion is provided with a tapered first interface connection portion 8 that protrudes with the end of the first center conductor 6 exposed, and is connected to the storage devices 2a, 2b, and 2c. It has become.

  Cylindrical second center conductors 9a and 9b are connected and fixed to both ends of the T-shaped head. At both ends in the axial direction of the second central conductors 9a and 9b, tapered second interface connecting portions 10a and 10b are provided which expose the cylindrical inner surface and are recessed. The inter-board buses 4a and 4b are connected to the second interface connecting portions 10a and 10b.

  A detection electrode 11 for voltage detection is embedded in the insulating layer 7. A ground layer coated with a conductive paint is provided on the outer periphery of the insulating layer 7 except for the first interface connection portion 8 and the second interface connection portions 10a and 10b. 12a and 12b are paddings for fixing the inter-board buses 4a and 4b and the insulating plug 5.

  With this configuration, two inter-board buses 4a and 4b can be connected, so that the current capacity of this portion can be increased from 1250A to 2500A, for example. The inter-board buses 4a and 4b themselves have the same configuration as the conventional one. As for the bus bushings 3a and 3b, the weight of the second center conductors 9a and 9b is increased compared to the conventional one in which the inter-board buses 4a and 4b are connected alone, but it is considered that the weight has increased. Should not. That is, it is lighter to split the bus buses 4a and 4b between the bus bushings 3a and 3b and the inter-board buses 4a and 4b, respectively, rather than increasing the cross-sectional area of the conductor to increase the capacity. Can be achieved. Further, heat dissipation at the inter-board buses 4a and 4b is promoted, and a temperature rise can be suppressed. If aluminum is used for the second central conductors 9a and 9b, the weight can be further reduced.

  According to the bus bushing of the first embodiment, the first center conductor 6 is T-shaped, the second center conductors 9a and 9b are provided at both ends of the head, and the two inter-board bus bars 4a and 4b are connected. Therefore, the current capacity of the inter-board buses 4a and 4b can be increased without increasing the weight. Further, the inter-board buses 4a and 4b have the same weight as the conventional one, and the assembly work can be facilitated.

  Next, a bus bushing according to the second embodiment of the present invention will be described with reference to FIG. FIG. 4 is a front view showing the configuration of the bus bushing according to the second embodiment of the present invention. The second embodiment differs from the first embodiment in that a plurality of inter-board buses can be connected. In FIG. 4, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 4, three second center conductors 9a, 9b, 9c are connected and fixed to the head of the T-shaped first center conductor 5, and the second interface connecting portions 10a, 10b, 10c are connected. , Paddings 12a, 12b, and 12c are provided. For this reason, three inter-board buses can be connected to the bus bushing 3a. These can be a plurality of three or more.

  According to the bus bushing of the second embodiment, a plurality of second central conductors 9a, 9b, 9c can be provided, and further increase in capacity and weight can be achieved.

  According to the embodiment described above, since a plurality of inter-board buses that are common bus bars for inter-board connection can be connected, the capacity and weight of the bus bushing can be increased.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

1a, 1b, 1c Box 2a, 2b, 2c Storage device 3a, 3b Bus bushing 4a, 4b Inter-board bus 5 Insulation plug 6 First central conductor 7 Insulating layer 8 First interface connection 9a, 9b, 9c 2 center conductors 10a, 10b, 10c Second interface connection part 11 Detection electrodes 12a, 12b, 12c

Claims (3)

A first central conductor having a T-shaped handle connected to the storage device;
A plurality of second central conductors connected to and fixed to the T-shaped head of the first central conductor and having an interface connecting portion for interfacing the inter-board busbars;
Bus bushing is characterized in that a provided an insulating layer around said first center conductor and the second central conductor. Bus bushing according to claim 1, characterized in that said first central conductor of the T-shaped each of the second center conductor to the head end of the connection is fixed.   The bus bushing according to claim 1 or 2, wherein a detection electrode for detecting a voltage is embedded in the insulating layer.

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