JPS5930494Y2 - transformer - Google Patents

Description

[Detailed description of the invention] This invention relates to a transformer that can be transported with the core, windings, and other internal parts assembled inside the main body, and that is miniaturized by eliminating the need for a conservator. be.

For example, manufacturing a 1000 KV class transformer requires large insulation dimensions for high voltage.

If these are manufactured in one piece, the windings, core, and outer case will inevitably be large and heavy, making it extremely difficult to accommodate them within the dimensional limits for transportation.

In order to solve these problems, a transformer as shown in FIG. 1 has been developed.

In the figure, 1 is a high-voltage line terminal, 2 is a low-voltage line terminal, and 3 is a neutral terminal, which are generally directly grounded.

Note that terminals 1 and 2 are connected to overhead lines, cables, or gas-insulated switchgear.

4 is a high-voltage side winding (series winding), 5 is a low-voltage side winding (common winding), 6 is an iron core, 7 is inside the main body, and 8 is an outer case, the inside of which is the circulation provided in 7 inside the main body. It communicates with the inside of the main body surface 7 via the opening 9 .

Reference numeral 10 indicates insulating oil filled in these two frames 7 and 8; 11 indicates an insulating support that supports 7 within the main body; and 12 indicates the potential at the terminals of the high-voltage side winding 4 and the low-voltage side winding 5 to 7 within the main body. The insulating bushing 13 is a conservator attached to the outer case 8 in order to alleviate the thermal expansion of the insulating oil 10 in the plane.

By configuring the transformer as described above, a certain degree of miniaturization can be achieved, but as is clear from Fig. 1,
Since the conservator 13 protrudes outward from the outer case 8, it has the disadvantage that it is not completely miniaturized.

This idea was made in order to eliminate the above-mentioned drawbacks.In addition to providing a breathing port inside the main body that communicates with the inside of the outer case, a part of the gas phase is left in the part of the main body that contacts the breathing port. The object of the present invention is to provide a transformer that is compact and easy to transport, eliminating the need for a conservator by storing insulating oil and filling an outer case with insulating gas.

An embodiment of this invention will be described below with reference to FIG.

In the figure, 1-8, 11 and 12 are the same as in FIG.

Reference numeral 14 denotes an insulating pipe for taking out and taking in the insulating oil 15 in the main body surface 7 for circulating the oil to an external cooler in order to cool it, and 16 indicates the gas phase part 7a in the main body surface 7 and the inside of the outer box 8. A breathing port 17 communicating with the gas phase portion 7a and the space inside the outer case 8 is filled with an insulating gas such as SF6.

According to one embodiment of this invention configured as described above,
The volume change due to temperature change of the insulating oil 15 inside the main body surface 7 is as follows:
Since it can be absorbed by the filling insulating gas 17,
A conservator can be made unnecessary.

As described above, according to this invention, the core and the main body are connected to approximately the mid-potential point of the winding, the main body is housed in a separate outer case at ground potential, and the main body and the outer case are connected to each other. A breathing port communicating with the outer box is provided in the main body, and an insulating oil is stored in the main body with a part of the gas phase remaining in a portion in contact with the breathing port, and the insulating oil is insulated from the outside. By filling the box with insulating gas, it is possible to provide a transformer that is small and easy to transport without the need for a conservator.

[Brief explanation of the drawing]

FIG. 1 is a simplified diagram showing the configuration of a transformer developed as a prior art, and FIG. 2 is a simplified diagram showing the configuration of a transformer according to an embodiment of this invention. In the figure, 4 and 5 are high and low voltage side windings, 6 is an iron core, 7 is inside the main body, 8 is an outer case, 15 is insulating oil, 16 is a breathing port, and 17 is insulating gas. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] The iron core and the main body are connected to approximately the mid-potential point of the winding, the main body is housed in a separate outer case at ground potential, and the main body and the outer case are insulated; In addition to providing a breathing port that communicates with the outer case, insulating oil is stored in the main body with a part of the gas phase remaining in the portion in contact with the breathing port, and the outer case is filled with an insulating gas. Characteristic transformer.