JPH07161538A - Gas cooled static induction machine - Google Patents

Abstract

PURPOSE:To provide a compact gas cooled static induction machine by disposing an outer cooler closely to an enclosed tank in parallel with the longitudinal direction thereby reducing the space being occupied by a gas pipe and an outer cooling system. CONSTITUTION:Outer coolers 2 for cooling gas, fans 4 for forcibly circulating the gas, and pipings 3 coupled, respectively, with a tank 1 and the outer cooler 2 are arranged closely to the tank 1 in parallel with the longitudinal direction. Consequently, conventionally unused space is utilized effectively and the space being occupied by a gas cooled static machine can be reduced. Outer coolers and fans can be installed additionally in thus saved space while enhancing the cooling performance and a higher performance gas cooled static machine can be realized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a static induction generator, and more particularly to a gas-cooled static induction generator using an insulating gas as a cooling medium.

[0002]

2. Description of the Related Art In recent years, mainly from the viewpoint of disaster prevention, there are many cases in which substation equipment is constructed in a place where it is desirable to install a non-flammable static induction generator. Examples of applications of non-flammable static induction equipment include underground substations that are built in urban areas with high power density, and power receiving equipment for buildings such as hospitals, airports, hotels, and department stores where an unspecified number of people enter and leave. it can. In the case of a relatively small capacity, a dry static device of class H insulation is used, and in the case of several MVA to several tens of MVA, mainly SF6 is used.
A gas-insulated / gas-cooled static induction generator that uses gas is used.When the capacity is further increased, a gas-insulated / liquid-cooled static induction generator that uses perfluorocarbon liquid as a cooling medium is used to improve cooling performance. ing.

Among them, insulation is performed only by gas without using liquid,
The cooling method has a simple structure because it does not use liquid, and the cost is low. Therefore, there is a need to be able to apply even higher capacity.

FIGS. 5 to 7 are block diagrams of conventional gas-cooled static induction generators. The cooling oil 2 whose temperature has risen in the tank 1 accommodating the stationary device body (winding, iron core, etc.) is sent to the common pipe 3 connecting the tank 1 and the external cooler 2. The cooling gas branched to each external cooler 2 in the common pipe 3 performs heat exchange through the wall of the cooler when passing through the external cooler 2, and the passing gas is cooled and the cooling gas whose temperature has dropped Are again sent to the tank 1 by the gas blower 4.

By the gas circulation as described above, the heat generated in the tank 1 is transferred to the external cooler 2 via the gas as the cooling medium and is released to the outside, whereby the gas cooling static device is cooled.

[0006]

The conventional methods have the following drawbacks. If the gas cooling static device is applied to a larger capacity, the generated loss increases, which causes a problem that the temperature of the windings and the iron core rises, and the number of external coolers and gas blowers increases or the size increases. It is necessary to improve the cooling performance. Therefore, the space occupied by the gas pipes and the external cooler becomes large, and as a result, the installation space of the entire substation becomes vast. In addition, if the external cooling system occupies a large proportion, the layout of the equipment in the substation will be restricted, the layout will be complicated, and further, the gas cooling static device will not fit in the installation space and the substation cannot be installed completely. Can also be considered.
In addition, the expansion of the substation installation space will lead to higher costs associated with higher land prices, as well as higher transportation and assembly costs in urban areas.

Therefore, an object of the present invention is to solve the above-mentioned problems of the gas-cooled static induction machine and to provide a compact gas-cooled static induction machine capable of further improving the performance.

[0008]

According to the present invention, a plurality of closed tanks filled with insulating gas and accommodating a main body of a stationary induction machine are arranged in parallel, and the insulating gas is blown to a plurality of external coolers through a blowing means. In the gas-cooled static induction machine, which is circulated in the closed tank after being cooled, the external cooler is arranged in parallel with the longitudinal direction of the closed tank.

[0009]

By doing so, the space occupied by the gas pipes and the external cooling system can be reduced, and the performance can be improved while being compact.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be specifically described below with reference to FIGS. The same parts as those of the conventional example shown in FIGS. 5 to 7 are denoted by the same reference numerals. FIG. 1 is a top plan view of a gas-cooled static induction generator according to an embodiment of the present invention.

FIG. 2 is a view on arrow A in FIG. An external cooler 2 for cooling the gas and a gas blower 4 for forcibly circulating the gas, and one of which is connected to the tank 1 and one of which is connected to the external cooler are installed close to each other in parallel with the longitudinal direction of the tank 2. By effectively utilizing the space that has not been used, the space occupied by the gas cooling static device is reduced.

3 to 4 show another embodiment of the gas cooling static device according to the present invention. The longitudinal direction of the external cooler is horizontal and a plurality of external coolers are arranged in a stack in the height direction, or the longitudinal direction of the external cooler is horizontal and more space is used in the height direction. There are four external coolers. With these configurations as well, it is possible to effectively utilize the occupied space of the gas-cooled static induction generator.

[0013]

As described above, according to the present invention, the space occupied by the gas pipe and the external cooling system can be reduced, the size can be reduced, and an external cooler and a gas blower can be added to the reduced space. You can
The cooling performance is improved, and it becomes possible to provide a higher performance gas cooling static device.

[Brief description of drawings]

FIG. 1 is a top plan view of a gas-cooled static induction generator according to an embodiment of the present invention.

FIG. 2 is a side view in the direction of arrow A in FIG.

FIG. 3 is a side view according to another embodiment of the present invention.

FIG. 4 is a side view according to still another embodiment of the present invention.

FIG. 5 is a top plan view of a conventional gas static induction generator.

6 is a side view of FIG.

FIG. 7 is a perspective view of FIG.

[Explanation of symbols]

 1 ... Tank 3 ... Common piping 2 ... External cooler 4 ... Gas blower

Claims (4)

[Claims] 1. A plurality of hermetically sealed tanks filled with an insulating gas and accommodating a stationary induction machine main body are arranged in parallel, and the insulating gas is blown and cooled to a plurality of external coolers by a blowing means, and then the hermetically sealed tank is placed in the hermetically sealed tank. In the gas-cooled static induction machine to circulate, the gas-cooled static induction machine is characterized in that the external cooler is closely arranged in parallel with the longitudinal direction of the closed tank. 2. The gas-cooled static induction generator according to claim 1, wherein the external cooler is disposed near the bottom of the closed tank. 3. The gas-cooled static induction generator according to claim 1, wherein the external cooler is arranged in the space between the closed tanks. 4. The gas-cooled static induction generator according to claim 1, wherein the external cooler is stacked in the space between the closed tanks.