JPH0556641B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in the winding cooling structure of a gas-insulated evaporatively cooled transformer that cools the windings, core, etc. with a condensable cooling medium.

[Conventional technology]

Substation facilities in densely populated areas such as urban centers are required to increase their capacity within the same site due to land shortages and rising power demand, or are required to be non-combustible for disaster prevention reasons, and this trend has been increasing recently. It's becoming more noticeable. For example, there is a gas insulated evaporative cooling transformer that meets these demands. This gas-insulated evaporative cooling transformer uses the latent heat of vaporization of a condensable cooling medium (hereinafter referred to as refrigerant) to cool the windings and core, and uses non-condensing insulation such as SF ₆ for insulation over a wide temperature range. It depends on gas.

In a conventional gas-insulated evaporative cooling type transformer, for example, as shown in FIG. 4, in order to cool heat-generating parts such as an iron core and windings, a dispersion method is adopted in which refrigerant is sprayed onto the heat-generating parts. That is, FIG. 4 is a cross-sectional view showing an example of the configuration of a conventional gas-insulated evaporative cooling transformer, in which a winding 2 wound around an iron core 1 is placed in a tank 4 together with a non-condensable insulating gas 3. It is stored.
The iron core 1 and the winding 2 are cooled by a refrigerant 6 dripping from a refrigerant conduit 5 disposed above the core. The refrigerant 6 that has cooled the iron core 1 or the winding 2 gathers in a refrigerant reservoir 7 provided at the bottom of the tank 4, passes through an external refrigerant conduit 9 by a pump 8, and returns to the refrigerant conduit 5. In this way, the refrigerant 6 cools the iron core 1 and the windings 2 while circulating in the order of the refrigerant conduit 5 → the surface or inside of the iron core 1 or the winding 2 → the refrigerant reservoir 7 → the pump 8 → the external refrigerant pipe 9 → the refrigerant pipe 5. That's what I do.

In such a gas insulated evaporative cooling transformer with a conventional structure of a scattering method, it is impossible to evenly contact the refrigerant inside the complex windings, and the problem is that the characteristics of the refrigerant cannot be fully utilized. The dot was hot.

[Problem that the invention seeks to solve]

The present invention has been made in order to solve the problems of the gas-insulated evaporative-cooled transformer of the conventional structure, and aims to provide a gas-insulated evaporative-cooled transformer that has good cooling efficiency and is miniaturized. purpose.

[Means to solve the problem]

In the present invention, a part of the winding is surrounded by an insulating refrigerant storage container, and parts of the winding where the temperature rise is high are partially boiled and cooled, thereby improving cooling efficiency and reducing the size of the winding. be.

[Effect]

In the gas-insulated evaporative cooling transformer according to the present invention, a part of the winding is surrounded by a refrigerant storage container, and the part of the winding where the temperature rise is high is cooled by the boiling cooling method, which has high cooling efficiency. In addition, by setting the dimensions of the refrigerant reservoir so as to obtain optimal cooling characteristics, it is possible to downsize the entire transformer.

[Embodiments of the invention]

Embodiments of the present invention will be described below based on the drawings. FIG. 1 is a cross-sectional view of essential parts showing an embodiment of the gas-insulated evaporative cooling transformer of the present invention, and FIG. 2 is a cross-sectional perspective view of an insulating refrigerant storage container. A symbol is attached. In FIGS. 1 and 2, reference numeral 10 denotes a refrigerant reservoir having an open top and a refrigerant dripping hole 10a at the bottom, and as shown in FIG. An outer cylinder 12 disposed outside the winding, and these inner cylinders 11
and a ring-shaped member 13 disposed at the bottom between the outer cylinders 12, and the refrigerant drip hole 10a is bored in this ring-shaped member 13. When this refrigerant storage container 10 is attached to the winding 2, first the ring-shaped member 13 is inserted through the duct pieces 14 etc. which are equally distributed in the circumferential direction in order to form an axial gap in the winding 2. Then, the inner cylinder 11 and the outer cylinder 12 are inserted into the circumferential side of the winding 2 via the vertical duct piece 15 and the like at an arbitrary distance from the winding 2, and connected to the ring-shaped member 13. Note that 16 is a vertical duct piece disposed on the inner and outer peripheries of the lower part of the winding 2.

FIG. 1 shows an embodiment in which boiling cooling is applied to the upper part of the winding 2; in this case, a refrigerant reservoir 10 is provided above the winding 2. In such a case, the refrigerant 6 dripped from the refrigerant conduit 5 evaporates and cools the upper part of the winding 2 in the refrigerant reservoir 10, and the refrigerant 6 is then rolled from the refrigerant dripping hole 10a on the bottom of the refrigerant reservoir 10. It is arranged so that the lower part of the winding 2 is cooled (evaporative cooling) by being dispersed at the lower part of the wire, and the whole is efficiently cooled.

FIG. 3 shows another embodiment of the present invention, in which it is desired to further cool the winding 2, particularly in the central part, and the same parts as in FIGS. 1, 2, and 4 are given the same reference numerals.
In the embodiment shown in FIG. 3, the central portion of the winding 2 is housed in a refrigerant reservoir. The refrigerant 6 dripped from the refrigerant conduit 5 is spread over the upper part of the winding 2, evaporates and cools the upper part of the winding 2, evaporates and cools the center of the winding 2 in the refrigerant storage container 10, and then the refrigerant 6 The refrigerant is sprayed onto the lower part of the winding 2 from the refrigerant dripping hole 10a on the bottom surface to cool the lower part of the winding 2 (evaporative cooling).

In the embodiments shown in FIGS. 1 and 3, the refrigerant is circulated by a pump to cool the windings and the iron core, as in the case shown in FIG. 4.

〔Effect of the invention〕

As explained above, in the gas insulated evaporative cooling type transformer of the present invention, the upper or middle part of the winding is surrounded by a refrigerant storage container, and the part of the upper or middle part of the winding where the temperature rise is high is subjected to boiling cooling. Therefore, a) Cooling efficiency is better than simple spraying method.

B. By appropriately selecting the dimensions of the refrigerant reservoir,
Cooling characteristics and costs can be optimized.

C. Since the entire winding is not surrounded by a refrigerant reservoir, it is easy to draw out the lead wire from the winding.

Effects such as this can be obtained.

[Brief explanation of the drawing]

1 and 3 are sectional views showing an embodiment of the gas insulated evaporative cooling type transformer of the present invention, FIG. 2 is a sectional perspective view showing an embodiment of the refrigerant storage container of the present invention, and FIG. 1 is a cross-sectional view showing an example of a conventional gas-insulated evaporatively cooled transformer. DESCRIPTION OF SYMBOLS 10... Refrigerant storage container, 10a... Hole for refrigerant dripping, 11... Inner cylinder, 12... Outer cylinder, 13... Ring-shaped member, 14... Duct piece, 15... Vertical duct piece.

Claims (1)

[Claims] 1. An evaporative cooling type transformer in which the main body of the transformer, which consists of windings, iron core, etc., is housed in a tank together with a non-condensable insulating gas and a condensable cooling medium, and is cooled by the condensable cooling medium. 1. A gas insulated evaporative cooling type transformer, characterized in that a part of the winding is surrounded by an insulating refrigerant reservoir having a refrigerant dripping hole, and is partially evaporatively cooled. 2. Claim No. 2, characterized in that a refrigerant storage container is disposed above the winding, the upper part of the winding is of an evaporative cooling type, and the lower part of the winding is of an evaporative cooling type by dispersing a condensable cooling medium. Gas insulated evaporative cooling type transformer according to item 1. 3. A refrigerant reservoir is disposed in the center of the winding, the center of the winding is evaporatively cooled, and the upper and lower parts of the winding are evaporatively cooled by dispersing condensable cooling medium. A gas insulated evaporative cooled transformer according to claim 1.