Gas insulation switch device and oil immersed transformer connection structure

Abstract

The present invention provides a connecting structure of a gas insulated switchgear and an oil-immersed transformer in which miniaturization and weight reduction are attained by suppressing axial length. One cone shaped insulation spacer 3 dividing insulating gas and insulating oil is arranged between the connection container 1 on a gas insulated switchgear 16 side in which the insulating gas is enclosed and the connection container 2 on an oil-immersed transformer 17 side in which the insulating oil is enclosed. The cone shaped insulating spacer 3 has a cone shape or a cross section shape similar thereto, having one side with projected surface and the other side with recessed surface, and the projected surface side is arranged on the gas insulated switchgear 16 side while the recessed side on the oil-immersed transformer 17 side. A buried conductor 4 for connecting the main circuit conductor 8 on the gas insulated switchgear 16 side to the flexible conductor 6 as the main circuit conductor of the oil-immersed transformer 17 is provided at the center portion of the cone shaped insulating spacer 3.

Description

Technical field [0001] The present invention relates to a connection structure between a gas insulated switchgear and an oil-immersed transformer installed in a substation. Background technique [0002] The gas insulated switchgear installed in the substation is constructed by arranging main circuit conductors in a closed container filled with insulating gas. On the other hand, oil-immersed transformers are constructed in a closed container filled with insulating oil as both For example, use an oil-gas type bushing that horizontally installs the high-voltage output side of the oil-immersed transformer on the side of the oil-immersed transformer, and connects with the gas insulated switchgear. However, if the oil-gas type bushing is used, the shaft length becomes larger, which hinders the reduction of the floor space and the downsizing and lightening of the equipment. Therefore, as a connection structure between a gas insulated switchgear and an oil-immersed transformer, it is kno...

AI Technical Summary

Problems solved by technology

[0003]However, in the conventional connection structure of the gas insulated switchgear and the oil-immersed transformer, two insulating partitions are required in order to form an intermediate chamber between the two. This intermediate chamber increases the axial length between the gas insulated switchgear and the oil-immersed transformer, making it difficult to reduce the footprint and reduce the size and weight of the equipment.

In contrast, in the connection structure between a gas insulated switchgear and an oil-immersed transformer using a tapered insulating partition, the axial length can be reduced, but since the allowable electric field of the insulating oil is higher than that of SF6 of about 0.5MPa sub>The gas is still low, so it is necessary to make the diameter of the tapered insulating partition used for the separation of the insulating gas and the insulating oil larger than the insulating partition usually used in the insulating gas, and the result is that in this part There are restrictions on the size and weight of the

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