JPS6239805B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a transformer with an economical cooling system.

Transformers installed in power plants have cooling systems that
A method has been adopted to make effective use of power plant space by sharing refrigerants such as generators and bearing oil and their circulation equipment.

Conventionally, there are devices of this type that use water as a refrigerant. There is a single-line connection diagram for a power plant, as shown in Figure 1. In the figure, 1 is the system line,
The main transformer 2 connected thereto, together with the station transformer 3, is directly connected to the generator 5 by a phase separation bus 4.

Power is supplied through the station transformer 3 to a station circuit 8 to which a circulating water pump 6, a station load 7, etc. are connected. 9 indicates a bridge or disconnection.

If there is no disconnector between the generator 5 and the main transformer 2, when the generator 5 is stopped, both the main transformers 2 are disconnected from the grid line 1, and when the generator is started, the in-house circuit 8 is connected to the main transformer 2. To supply power, starting transformer 1
0 is required.

In this case, the main transformer 2 is integrated with the operation of the generator 5, and is not excited (receives power) while the generator 5 is stopped, and the cooling device of the main transformer 2 is connected to the generator 5. It was possible to share the refrigerant of the cooling device, such as bearing oil, and its circulation power.

On the other hand, as shown in FIG. 2, there are cases where a disconnector is connected between the generator 5 and the main transformer 2.
In this case, even when the generator 5 is stopped, it is possible to receive power from the main transformer 2 and supply power to the station circuit 8 via the station transformer 3, and the starting transformer 10 in FIG. 1 can be omitted. becomes.

However, when the cooling system for the main transformer 2 is shared with the refrigerant and circulation system for the generator, bearing oil, etc., for example, when the refrigerant is water, the main transformer 2 is heated while the generator 5 is stopped. When receiving electricity, it cools down the heat caused by iron loss and slight load loss.
It is necessary to operate a large circulating water pump or to install a starting transformer 10 as shown in FIG. 1, which has the disadvantage of being uneconomical.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and it has the ability to cool down the heat generated at full load in the one in which a sheath breaker is connected on the low pressure side. By providing a first cooling device that shares the refrigerant and its circulation device for cooling the engine, and a second cooling device that has the ability to cool the heat generated during no-load conditions, the need for a startup transformer is eliminated. The purpose of the present invention is to provide a transformer that can be cooled economically.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A transformer in an embodiment of the present invention will be explained below with reference to the drawings.

Figure 3 shows a case in which water is used as the refrigerant for cooling equipment for generators, bearing oil, etc., and the main cooling equipment for the transformer is an oil feed water cooling type, and the water and circulation equipment are shared. This figure shows an example of the arrangement of the cooler.

In the figure, 31 is a transformer, 32 is an oil feed water cooler, 33 is an oil feed air cooler, 34 is a cooling water circulation device, and 35 is an oil feed pump.

In the embodiment configured as described above, the oil-feeding water-cooled cooler 32 is the main cooler of the transformer 31, and the oil-feeding air-cooled cooler 33 is the secondary cooler, and the latter is the main cooler of the transformer 31. The purpose is to cool down the heat due to iron loss and slight load loss, and the former is to cool down the heat due to other losses at full load.

If the cooling water supply device does not operate, the cooling capacity of the oil-feeding water-cooled cooler 32 is lost, but it is possible to operate at a low load with the oil-feeding air-cooled cooler 33 that uses air as a refrigerant. An economical cooling system can be created.

In the above embodiment, the main cooling device is an oil-fed water-cooled type, and the secondary cooling device is an oil-fed air-cooled type cooler. However, the refrigerant of the main cooling device is Fluid such as oil or nitrogen may be used as long as it is the same as the refrigerant used in the cooling device such as bearing oil and the circulation device can be shared. It may be a self-cooling type cooler, an oil-feeding water-cooled type cooler, or another type of cooling type, and the same effects as in the above embodiments can be achieved.

As described above, according to the present invention, the main cooler of a transformer is combined with a secondary cooler that uses a different refrigerant or refrigerant circulation system, so that the refrigerant of the cooling system for generators, bearing oil, etc. and its circulation are combined. When the device is shared with the main cooler of the transformer to make effective use of space in the power plant, the circulation device can receive power without having to move while the generator is stopped, and there is no disconnection between the circulator and the generator. In the case of a certain main transformer, the main transformer and station transformer can supply power to the station circuit even when the generator is stopped, eliminating the need for a startup transformer, and eliminating the need for a refrigerant circulation system for the main cooling system. There is no need to move the transformer, and an economical cooling system transformer can be obtained, which has a remarkable practical effect.

[Brief explanation of the drawing]

1 and 2 are schematic diagrams showing a part of a single line diagram of a power plant, and FIG. 3 is a schematic diagram showing a configuration of a transformer in an embodiment of the present invention. In the figure, 31...Transformer, 32...Oil-feeding water-cooled cooler as a first cooling device, 33... Oil-feeding air-cooled cooler as a second cooling device, 34... Cooling water circulation device, 35... Feedback oil pump. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] 1. A first cooling device that is installed in a power plant, shares the refrigerant of the generator cooling device and the circulation power of the refrigerant, and is stopped when the generator is stopped;
A transformer comprising: a second cooling device that operates even when the generator is stopped. 2. The transformer according to claim 1, wherein the first cooling device is an oil-feed water cooling type. 3. The transformer according to claim 2, wherein the second cooling device is of an oil feed air cooling type.