JPS58101408A - Operation of evaporative-cooling type transformer - Google Patents

Abstract

PURPOSE:To maintain the internal pressure of the container at the prescribed value for the titled transformer using a recovery tank which is used to lessen the rise of internal pressure by a method wherein the insulation gas in the container is flown out into the cooling device when the internal pressure of the container reaches the prescribed pressure. CONSTITUTION:When the transformer starts operation, cooling liquid 13 is sprayed from a sprayer 4 upon the heated core 2 and the winding 3, the cooling liquid 13 is transformed into vapour 13a, the pressure of vapour goes up, interacted with the charged pressure of insulation gas 14, and the internal pressure of the container 15 is brought up. When the internal pressure 14 of the container reaches the prescribed value, stop valves 8 and 9 are opened, and the pressure in the container 15 is discharged to the cooling device 5. As a result, the insulating gas 14 and the vapour 8a of a high temperature are brought into the cooling device 5 from the connection pipe 6, and they are cooled there. Vapour 18a is condensed and transformed into the cooling liquid 13, and the operation of the transformer is continued. Through these procedures, the internal pressure of the container can be maintained at the prescribed value without having a recovery tank to be used for lessening the increased internal voltage.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of operating an evaporatively cooled transformer that enables a reduction in the installation area.

The conventional one was constructed as shown in Fig. 1.

In the figure, (1) is a container forming the transformer body, (2
The iron core (3) is a winding wound around the iron core (2), and the iron core (2) and the winding (3) are housed in a container (1). (4) is a diffuser installed at the top of container (1) facing iron core (2), (5) is a cooler, (6) and (7)
and (81 (9) are the connecting pipes (6) and (7) that connect the container (1) and the cooler (5), respectively).
The opening/closing valve installed in
) and the recovery tank Q9, and (6) is an on-off valve provided in the connection pipe Q1.

In the case shown in Figure 1, when each on-off valve (8) 61) is opened and the on-off valve @ is closed, a cooling liquid that is condensable and insulating and evaporates at a predetermined temperature is placed in the container (1). ) is injected in a predetermined amount, and a non-condensable insulating gas α◆ is also sealed at a predetermined pressure.

When the transformer is operated in the illustrated state, the iron core (2) and winding (3) generate heat. In order to cool the iron core (2) and the winding (3), the cooling liquid (2) is pumped up by a pump (not shown) and sprayed onto the iron core (2) and the winding (3) from a sprayer (4). Ru.

As a result, the iron core (2) and the winding (3) are cooled by the latent heat of vaporization when the cooling liquid evaporates. The vapor (18a) of the evaporated cooling liquid flows into the cooler (5) from the connecting pipe (6) together with the insulating gas Q4. The steam (laa) cooled by the cooler (6) is condensed to become a cooling liquid, which is returned into the container (1) through the connecting pipe (7).

In this case, the iron core (2) whose temperature rises due to the operation of the transformer.
and the winding (3) are cooled by evaporation of the cooling liquid (2). Therefore, the pressure inside the container (1) increases due to the generation of steam (laa), and when the internal pressure reaches a predetermined pressure, the on-off valve (2) is opened and the insulating gas αXun and steam inside the container (1) are opened. (18B) is flowed into the recovery tank α1, and the pressure in the container (11a) is lowered to a predetermined pressure or less, and operation of the transformer is continued.

The conventional operating method requires a recovery tank αQ to maintain the internal pressure of the container (1) below a predetermined pressure, which has the disadvantage of increasing the installation area.

This invention was made to eliminate the above drawbacks.
This is an evaporative cooling transformer in which the cooler is evacuated, the transformer is started, and when the pressure inside the container reaches a predetermined pressure higher than the pressure at startup, the insulation scum in the container flows toward the cooler. provide.

The figures will be explained below. In No. 29, (2) (1
) (4) (5) (6) (71(8) (91Q
, lα♦ are the same as before. (to) is a container and a connecting pipe (
6) and (7) are connected to the cooler (6).

The one in Figure 2 shows the on-off valves (8) and (9) that are opened to create a vacuum inside the cooler (5) and the container (to). is closed, a cooling liquid (2) is injected into the container (G), and an insulating gas A4 is sealed at a predetermined pressure.

When the transformer is operated in the condition shown, the iron core (2
) and the winding (3) from the sprayer (4), the cooling liquid (through) evaporates and becomes steam (18 m), the steam pressure increases and the insulation The pressure inside the container (G) increases in cooperation with the sealing pressure of the gas α◆.

When this internal pressure reaches a predetermined pressure, each on-off valve (8)
9) to release the pressure inside the container (G) toward the cooler (5). Due to this, the insulating gas Q4 and steam (18a), which have become high in temperature, enter the cooler (5) from the connecting pipe (6) and are cooled, and the steam (18a) is condensed and the cooling liquid ( ), and operation continues.

According to this invention, the inside of the cooler is evacuated and the transformer is started, and when the pressure inside the container reaches a predetermined pressure lower than the pressure at startup, the insulating gas in the container is made to flow to the cooler. Therefore, the transformer can be operated while maintaining the internal pressure of the container at a predetermined value without requiring (b) a storage tank for mitigating the rise in internal pressure.

[Brief explanation of the drawing]

FIG. 1 is a front view of the conventional system, and FIG. 82 is a front view illustrating the operating method of the invention. In the figure, (2) is the iron core, (3
) is the winding, (5) is the cooler, (2) is the coolant, (18M
) is a steam, O-curvature is an insulating gas, and (to) is a container. Note that the same reference numerals in each figure indicate the same or equivalent parts. Figure 1 Figure 2

Claims (1)

[Claims] An iron core and a winding wound around this iron core are housed in a container filled with a non-condensable insulating gas at a predetermined pressure, and the condensable gas has a higher specific gravity than the above-mentioned insulating gas to provide insulation. An evaporative cooling type transformer in which a cooling liquid containing the liquid is cooled by the latent heat of vaporization during evaporation of the cooling liquid over the iron core and the winding, and the vaporized cooling liquid is condensed in a cooler connected to the container. In the operating method, the inside of the cooler is evacuated and the transformer is started, and when the internal pressure of the container reaches a predetermined pressure higher than the pressure at startup, the insulating gas in the container is transferred into the cooler. A method of operating an evaporative cooling transformer characterized by allowing the current to flow.