JPS626808Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a composite electric device equipped with a current transformer.
A reduced-sized gas-insulated switchgear and an oil-filled electrical device such as an oil-filled transformer are connected, and a current transformer is attached to the connected portion to form a composite electrical device with a current transformer. In such cases, conventionally, a small oil chamber is constructed between the reduced type gas-insulated switchgear and the oil-filled electrical equipment, and the bushings are connected to the small oil-filled electrical equipment from both the reduced type gas-insulated switchgear and the oil-filled electrical equipment. The bushing conductors were brought into the room and connected, and a bushing type current transformer was attached to one of the bushings in oil.

For this reason, it is difficult to install and inspect the current transformer.
The overall length of the device became long, making it uneconomical.

In view of the above points, this project uses a double flange type bushing to omit the small oil chamber and encloses the current transformer in the air.
The present invention will be explained based on examples.

In the figure, reference numeral 1 denotes a reduced type gas insulated switchgear, and a container 2 is compressed and filled with a highly insulating arc-extinguishing gas 3 such as SF ₆ gas. 4 is an insulating spacer that partitions the gas and supports the main circuit conductor 5. 6
Reference numeral 7 indicates a contact that connects to one end of a bushing conductor 12d, which will be described later, and 7 an end cover.

Reference numeral 8 denotes an oil-filled transformer disposed opposite to the reduced type gas insulated switchgear 1, in which a container 9 is filled with insulating oil 10, and an end cover 11 is provided at a position opposite to the end cover 7. It is being

12 is a double flange type bushing, and the double flanges 12a and 12b are used for the end covers 7 and 1 of the reduced type gas insulated switchgear 1 and the oil-immersed transformer 8.
1, and the space between both flanges is placed in the atmosphere. That is, one end 12c of this bushing 12 passes through the end cover 7 of the reduced type gas insulated switchgear 1 and the bushing conductor 12d is connected to the main circuit conductor 5, and the other end 12e is connected to the end of the oil-immersed transformer 8. The bushing conductor 12d passes through the lid 11 and connects to the main body 13.
It is connected to by a lead wire 14.

a double flange 12a of the bushing 12;
A split-through type current transformer 15 is placed between the parts 12b and the current transformer 15 in the atmosphere.

Although various types of bushings can be used as the bushing 12, it is convenient to use, for example, a well-known capacitor type dry bushing constructed by impregnating a capacitor cone with epoxy resin.

In the above-mentioned composite electrical equipment with a current transformer, current flows from the reduced type gas insulated switchgear 1 to the oil-immersed transformer 8 via the bushing 12, which is transformed by the split through type current transformer 15 and its value is detected. be done.

As detailed above, in accordance with the present invention, the reduced type gas insulated switchgear and the oil-filled electrical equipment are connected by a double flange type bushing, and a split through type current transformer is mounted between the flanges to form a current transformer. Since the current transformer is exposed to the atmosphere,
Work such as installation, replacement, and inspection of this current transformer can be done extremely easily from the outside without removing bushings or other parts, and it also shortens the overall length of the device, reducing installation space and making it more economical. It has extremely practical effects. Furthermore, when the double flange type bushing is configured with a capacitor type dry bushing, its diameter becomes smaller, so the inner diameter of the divided through-type current transformer mounted on it becomes smaller, and it takes a smaller current transformer to obtain the same characteristics. I can get away with it.

[Brief explanation of the drawing]

The figure is a partial vertical sectional view showing an embodiment of the present invention. 1...Reduced gas insulated switchgear, 3...Gas,
8...Oil-immersed transformer, 10...Oil, 12...Double flange type bushing, 12a, 12b...Double flange, 15...Divided through-type current transformer.

Claims (1)

[Utility Model Claims] (1) A composite electric device with a current transformer comprising a reduced-size gas-insulated switchgear, an oil-filled electric device arranged opposite to the reduced-size gas-insulated switchgear, a double-flange type bushing having one end protruding into the gas of the reduced-size gas-insulated switchgear and the other end protruding into the oil of the oil-filled electric device and having double flanges connected to the end covers of the reduced-size gas-insulated switchgear and the oil-filled electric device, respectively, with the space between the double flanges exposed to the atmosphere, and a split through-type current transformer fitted between the double flanges. (2) A composite electric device with a current transformer according to Utility Model Claim 1, characterized in that the double-flange type bushing is composed of a capacitor-type dry bushing.