JPH0869921A - Cooling device for gas insulated stationary induction electric equipment - Google Patents

Abstract

PURPOSE: To minimize the construction cost of an underground substation by driving a blower used for forcibly circulating a gas in a transformer tank by means of a water-cooled motor. CONSTITUTION: A gas in a transformer tank 1 is circulated through gas piping 7 by driving a gas blower 3 by means of a motor 4 for gas blower. The gas is cooled by means of a water-cooled gas cooler 2 by performing heat exchange between the circulated gas and cooling water from a radiator 6 for gas cooler. At the time of cooling the gas, the main body of the motor 4 is cooled by using a water-cooled motor as the motor 4 and fitting a motor jacket 5 for cooling water to the outside of the main body of the motor 4. Therefore, the excavation cost of an underground substation can be reduced, because the size of the cooling device can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device for a gas-insulated static induction electric device, which is applied to, for example, a transformer or a reactor, and is particularly suitable for cooling by a water-cooled cooler. Regarding the device.

[0002]

2. Description of the Related Art With the recent increase in demand for electric power, substation equipment tends to have a large capacity, but there is also a demand for a gas insulation transformer installed in an underground substation or the like to have a large capacity. Since the amount of heat generated from windings, iron cores, etc. increases due to the increase in capacity, and the generated heat is a major cause of deterioration of internal parts, for example, wind-cooled cooling of a transformer as disclosed in JP-A-2-234404. A device is provided.

FIG. 2 is a schematic diagram of a conventional cooling device for a transformer, in which a large amount of gas is supplied to windings, iron cores, etc. contained in a tank 1 serving as a heat source by generating a gas flow by a gas blower 3. Since it is sent, the cooling efficiency of the transformer can be improved.

[0004]

In a large-capacity gas-insulated transformer with an increased amount of heat generation, it is necessary to increase the output of the gas blower motor in order to supply the gas flow rate for sufficient heat exchange. is there. For that purpose, it is necessary to increase the capacity and size of the motor, which increases the size of the entire transformer system. If the size is increased, the excavation area will be increased and the construction cost will be increased if the substation is installed.

The object of the present invention is to eliminate the above-mentioned drawbacks,
(EN) It is possible to provide a cooling device for a gas-insulated static induction electric device that is simple and downsized, and that can reduce the construction cost to a necessary minimum even when it is used in an underground substation.

[0006]

In order to solve the above problems, in the present invention, a blower for forcibly circulating the gas in the transformer tank is driven by a water-cooled motor.

[0007]

[Advantage] By adopting a water-cooled motor, the temperature rise of the motor winding can be kept below the allowable value even if the motor output is increased. By using a water-cooled motor for the blower motor, the blower motor can be Can be miniaturized. Therefore, the installation area of the transformer can be minimized and the excavation cost at the underground substation can be reduced.

[0008]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing an embodiment of a cooling device for a gas insulation transformer according to the present invention. The transformer tank 1 is filled with a transformer content body including an iron core and windings, and insulating gas. Outside the transformer tank 1, a water-cooled gas cooler 2 that cools a gas that serves as a refrigerant for the transformer and a gas blower 3 that is driven by a motor 4 are provided and connected to the transformer tank 1 via a gas pipe 7. To form a gas circulation channel.

The cooling water in the water cooling motor jacket 5 is
The cooling water pipe 8 of the gas blower water-cooled motor 4 is branched from the cooling water pipe 8 connected from the gas cooler radiator 6 to the gas cooler to divide the cooling water of the gas cooler 2 into the gas blower water-cooled motor 4. Used as cooling water.

The water-cooled gas cooler 2 includes a radiator 6 for the gas cooler, a cooling water valve 10 and a pipe 8 for the cooling water of the gas cooler.
The low-temperature cooling water that flows in via the heat exchanger exchanges heat with the high-temperature gas that has flowed out of the transformer tank 1 and has flowed in through the gas pipe 7, and the low-temperature gas that has flowed out is discharged. The low-temperature gas flows into the transformer body 1 again to cool the contents of the transformer body.
The gas-blower water-cooled motor 4 has a water-cooled motor jacket 5 attached to the outside of the motor body to cool the motor body.

As a result, the cooling water for the water-cooled motor 4 for the gas blower can be supplied from the radiator 6 for the gas cooler, so that the cost for securing the cooling water hardly increases and the motor volume can be reduced. The cost of the motor can be reduced.

In the present embodiment, the water cooling motor jacket of the gas blower water cooling motor and the cooling water piping to the gas cooler are in parallel, but they may be in series, and the gas cooling water cooling motor Since the amount of cooling water is small, the cooling water of the water-cooled motor for gas blower may be supplied from another pipe such as a radiator.

Next, another embodiment according to the present invention will be described. FIG. 3 shows an example in which three cooling devices of the above-described embodiment are installed in one transformer tank. The cooling device has a cooling capacity capable of performing sufficient cooling for 100% load during operation of the transformer. Since 100% load operation of the transformer is set at the maximum power consumption, it is normally a low load operation. The heat generated by the loss in the transformer does not require the cooling capacity of three cooling devices in normal operation.

Therefore, in normal operation, three cooling devices are not used and one or two cooling devices are operated depending on the load. Further, since the pressure loss of the gas flow path is reduced due to the reduction in the number of units, the frequency of the blower motor controlled by the inverter is lowered to a frequency at which a sufficient gas flow for cooling can be secured. As a result, noise generated by the gas blower can be suppressed.

In this embodiment, the number of cooling devices,
There is no restriction on the blower motor, and it is intended to suppress noise by controlling a plurality of water-cooled blower motors. Especially at night, it is necessary to reduce the noise, but at night, the load on the transformer is small and the noise reduction by controlling the blower motor is very effective.

[0017]

According to the cooling device for a gas-insulated static induction electric device of the present invention described above, since the water-cooled motor is adopted as the gas blower motor, the cooling device can be downsized and the gas-insulated static induction device. Since the whole can be miniaturized, the excavation cost in the underground substation can be reduced.

[Brief description of drawings]

FIG. 1 is a structural schematic view showing an embodiment of a cooling device for a gas insulation transformer of the present invention.

FIG. 2 is a structural schematic view showing an embodiment in which a plurality of cooling devices for a gas insulation transformer of the present invention are installed.

FIG. 3 is a structural schematic view showing another embodiment of the cooling device for the gas insulation transformer of the present invention.

FIG. 4 is a diagram for explaining the structure of a gas-insulated static induction generator in the prior art.

[Explanation of symbols]

1, 101 ... Transformer tank, 2 ... Water-cooled gas cooler,
3, 103 ... Gas blower, 4 ... Water cooling motor for gas blower, 5 ... Water cooling motor jacket, 6 ... Gas cooler radiator, 7 ... Gas pipe, 8 ... Gas cooler cooling water pipe,
9 ... Piping for motor cooling water, 10 ... Cooling water valve, 102
... Wind-cooled gas cooler, 104 ... Gas piping, 105 ... Iron core, 106 ... Winding.

Claims (7)

[Claims] 1. A gas-insulated static induction electric device in which a content body consisting of at least a winding wire and an iron core and an insulating gas are enclosed in a tank, a gas blower for circulating the gas in the tank through a gas pipe, and the gas blower. Motor for driving a gas blower, a water-cooled gas cooler arranged in the middle of the gas pipe to cool the gas by exchanging heat between the circulating gas and cooling water from the radiator, and cooling from the radiator to the gas cooler A cooling device for a gas-insulated static induction electric device, comprising: a cooling water pipe for guiding water; wherein the gas blower motor is a water-cooled motor. 2. A pipe for cooling water of a water-cooled motor for a gas blower is branched from a cooling water pipe for a water-cooled gas cooler of the gas-insulated static induction machine to use the cooling water for a water-cooled gas cooler as cooling water for a water-cooled motor for gas blower The cooling device for a gas-insulated static induction generator according to claim 1, which is used. 3. The cooling water pipe for the water-cooled gas cooler of the gas-insulated static induction machine and the cooling water pipe for the water-cooled motor for gas blower are connected in parallel via a cooling water pipe valve. Gas-insulated static induction system cooling system. 4. A cooling water pipe for a water-cooled gas cooler of the gas-insulated static induction machine and a cooling water pipe for a water-cooled motor for a gas blower are connected in series via a cooling water pipe valve. Gas-insulated static induction system cooling system. 5. A gas-insulated static induction electric device in which at least a content body consisting of a winding wire and an iron core and an insulating gas are enclosed in a tank, a gas blower for circulating the gas in the tank through a gas pipe, and the gas blower. Motor for driving a gas blower, a water-cooled gas cooler arranged in the middle of the gas pipe to cool the gas by exchanging heat between the circulating gas and cooling water from the radiator, and cooling from the radiator to the gas cooler In a cooling device for a gas-insulated static induction machine having a cooling water pipe for guiding water, the gas blower motor is water-cooled, and one tank is provided as a set of the gas blower motor, the water-cooled gas cooler, and the cooling water pipe. A gas-insulated static induction electric device cooling device, characterized in that a plurality of sets are connected to each other. 6. A plurality of cooling devices, which are mounted in parallel and are movable independently of each other, are operated by the number of devices that secure a gas flow that can sufficiently cool the gas according to the load of the gas-insulated static induction machine. The cooling device for a gas-insulated static induction machine according to claim 5. 7. The frequency of the gas blower motor is lowered by inverter control to a frequency that secures a gas flow capable of sufficiently cooling the gas of the gas-insulated static induction generator according to the load. Gas-insulated static induction system cooling system.