JP2010219185A - Method for cooling transformer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an auxiliary cooling method capable of being conveniently disposed and easily removed as needed without corroding existing electric equipment. <P>SOLUTION: In equipment cooling a transformer body 10 and a radiator 28 using a blower fan 29 by circulating a cooling and insulating fluid therebetween through a piping 19 by a pump 51, a mist generator 35 which generates and sprays a mist 17 having a particle diameter of 80 micron or less is mounted spaced such a distance that the mist 17 sprayed to the cooling fin 31 in the radiator 28 to be cooled is vaporized before reaching thereto and air 18 cooled by the effect of the vaporization heat of the mist 17 sprayed from the mist generator 35 is blown on the cooling fin 31 by the blower fan 29 to cool the radiator. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a transformer cooling method and apparatus for cooling transformers installed indoors such as underground substations with a simple method and apparatus.

In general, in the transformer cooling design, the condition of “cooling capacity> transformer loss” is satisfied. However, to cool the transformer, there is a method of providing a radiator separately from the transformer body and naturally cooling with air, and cooling or insulating oil in the transformer body is forced or naturally circulated to the radiator to air-cool. For example, a method of forcibly circulating the insulating oil in the transformer body to the radiator and cooling it with water is used. However, during heavy overload in summer, copper loss due to load current increases, and the cooling environment at the time of completion is maintained due to weather conditions (temperature, wind speed, etc.) and installation conditions (concealment by noise countermeasures). It is often difficult. In particular, electrical equipment installed in a place affected by solar radiation is easily affected by weather conditions. Moreover, in the case of electrical equipment concealed by noise countermeasures or electrical equipment installed in a substation building, the air flow rate of the radiator is significantly reduced, so that the cooling capacity is reduced and the cooling effect is reduced. For this reason, there is a possibility that it becomes difficult to secure a desired electric capacity, or that deterioration of the internal material of the electric equipment (for example, a transformer) is accelerated and the life of the electric equipment is shortened.

In such a case, as the simplest method for supplementing the cooling effect, for example, a watering device is provided above the radiator, and a solenoid valve is opened every predetermined time by a timer or the like, and a nozzle formed on the watering hose is used. There is a method of spraying cooling water to a radiator (see FIG. 1 of Patent Document 1).

Also, the oil temperature in the radiator installed on the transformer body is detected by the fluid temperature sensor, and the cooling device is activated on the condition that the detected temperature is equal to or higher than the set value, and the water pump is driven by the control unit. In addition, there is a valve that opens the valve, sprays cooling water from a water source such as a tank or water pipe, and increases the cooling capacity by "natural cooling amount + sprinkling cooling amount" to cool the oil temperature. (See Patent Document 2 FIG. 10).

In addition, as shown in FIG. 6, in a transformer for indoor installation adopting a simple cooling method, the cooling water can be supplied with its own water pressure for the purpose of obtaining a cooling method and apparatus capable of cooling more effectively with a small amount of water. Air supply unit 2 which makes the spray water mist with the nozzle unit 15 to be sprayed and the compressed air
7 is provided, and the air cooled by both the sprayed water having a particle diameter of about 100 microns and the heat of vaporization of the sprayed water is sucked by the blower fan 29 to be cooled (this In an example, there is a cooling device for a transformer body characterized in that the cooling fin portion 31) in the radiator 28 is blown and cooled (see FIG. 2 of Patent Document 2).

JP 2001-345218 A JP-A-7-283034

However, according to the method shown in FIG. 10 of Patent Document 1 or Patent Document 2, since the cooling water is injected only by the water pressure, a large number of large water particles of several hundred microns or more are mixed together. Since they are dispersed over a wide range from small to large diameters, there are few things that directly contribute to the temperature drop of electrical equipment, and most of them fall to the ground without being vaporized in the air. . Therefore, the cooling effect is low. There is a problem that the amount of cooling water sprayed increases, and depending on the substation, there is a problem that cooling water may not be sprayed due to insufficient water pressure. Furthermore, there is a problem that it is not suitable for indoor use due to the drainage facilities.

That is, the problem from the drainage facility is that when the transformer body 10 is an outdoor installation type, excess water flowing from the transformer body 10 can be drained by a simple device such as a drainage groove. However, indoor installations, especially underground substations, have the problem of requiring extremely large and large devices such as making a water storage tank after cooling and pumping it up to the ground.

Further, the device of FIG. 2 of Patent Document 2 cools by spraying both the sprayed water and the air cooled by the vaporization heat of the sprayed water by the blowing fan 29 and blowing it to the cooling fin portion 31. Therefore, water droplets adhere to the cooling fan 31 in the blower fan 29 and the radiator 28. The adhering water droplets evaporate to exert a cooling effect on the electric equipment, but on the other hand, cause a problem of causing corrosion of the equipment.

In addition, when water droplets attached to the cooling fins 31 in the blower fan 29 or the radiator 28 are not vaporized, they will fall to the ground. There was a risk that floor materials such as concrete would get wet and cause deterioration of the floor materials.

Furthermore, in order to draw both the sprayed water and the sprayed water to the blower fan 29 and directly blow the sprayed water on the cooling fin portion 31, it is in a state of being almost integrated with the electrical equipment in the vicinity of the blower fan 29. The cooling water injection unit 34 has to be installed. For this reason, when installing the equipment or changing the fixed position, the operation of the electrical equipment (for example, a transformer) must be temporarily stopped, and the installation work of the equipment is very troublesome and the operation is performed. It was a factor that the operating rate of the transformer declined by stopping. Moreover, in order to temporarily stop the operation of the electric equipment, naturally, a procedure for stopping the operation is necessary, and work labor such as voltage detection and grounding is required. In addition, the pipe that is the passage of the cooling water connected to the cooling water injection device for injecting the cooling water has a length of about 3 m to 4 m and is long. It was a very dangerous task. Furthermore, since the cooling device is integrally fixed to the electrical equipment, there is a problem that it is not easy to remove the cooling device and change its installation position.

Accordingly, an object of the present invention is to provide an auxiliary cooling method that can be easily arranged and removed as needed without causing corrosion to existing electrical equipment.

In order to solve such a problem, in the cooling method of the present invention,
For a device that circulates a cooling and insulating fluid between a transformer body and a radiator by a piping and a pump and cools by a blower fan, mist is generated and sprayed, and the sprayed mist cools in the radiator. A mist generating device is provided so as to be vaporized before reaching the fin portion, and air cooled by the vaporization heat of the mist sprayed from the mist generating device is blown to the cooling fin portion by the blower fan. It was made to cool.

Further, in the cooling device according to the present invention, between the transformer body and the radiator, for the device that circulates the cooling and insulating fluid by the pipe and the pump and cools by the blower fan,
A mist is generated and sprayed on the fan side opposite to the cooling fin portion in the radiator, and the sprayed mist is vaporized before reaching the cooling fin portion in the radiator. To provide a mist generator,
Air cooled by the heat of vaporization of the mist sprayed from the mist generator is sucked by the blower fan and blown to the cooling fin portion for cooling.

In the cooling method according to the present invention, the mist generator generates the mist of fine particles of 80 microns or less. In the cooling method according to the present invention, the mist generator is installed in the vicinity of the air inlet of the building where the radiator is installed.

According to the present invention, since the mist sprayed by the mist generating device is vaporized and cooled by blowing the air cooled to the cooling fin portion using the blower fan, water droplets do not adhere to the electrical equipment. Therefore, it is possible to cool without causing corrosion.

Further, if the mist generating device is portable, it can be easily arranged and removed as necessary from the existing electric equipment for indoor installation.

Explanatory drawing which shows 1st Example of the cooling method of the transformer by this invention Explanatory drawing which shows 2nd Example of the cooling method of the transformer by this invention Explanatory drawing which shows 3rd Example of the cooling method of the transformer by this invention Explanatory drawing which shows 4th Example of the cooling method of the transformer by this invention Explanatory drawing which shows 5th Example of the cooling method of the transformer by this invention Explanatory drawing showing a method of cooling a transformer according to the prior art

  The best mode for carrying out the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 10 denotes a transformer body installed indoors for power distribution in an underground substation. The high temperature outlet 20 and the low temperature inlet 21 of the transformer main body 10 are connected to a pipe 19 for circulating oil as a refrigerant / insulating fluid of the transformer main body 10. Branches on the way so as to be guided to the radiator 28, passes through the cooling fin portion 31 of each radiator 28, is connected again, and returns to the low temperature inlet 21. The pipe 19 is provided with a pump 51 to forcibly circulate the refrigerant / insulating fluid.

Note that the refrigerant and insulating fluid is oil in the following examples, but electrical insulating gas,
Other fluids may be used. In FIG. 1, one transformer body 10
The two radiators 28 are connected to each other so that two units are driven during an overload such as summer and one unit is driven during a light load such as winter. However, the present invention is not limited to this. Can be connected to three or more radiators 28 to control the number of units according to the size of the load, or a plurality of transformer bodies 10 can be connected to one large or two or more radiators 28. You may make it connect.

A cooling fin portion 31 is provided in the radiator 28, and a rectifying wire mesh 3 is provided on one side portion.
0 is provided between the rectifying wire mesh 30 and the cooling fin portion 31.
Is provided. The opening on the other side of the radiator 28 faces the exhaust port 33 of the wall 32. The air is blown by the air blowing fan 29 after heat exchange with the cooling fin portion 31.
The exhaust port 33 is configured to come out. In FIG. 1, solid arrows indicate air,
A one-dot broken line and a one-dot dashed line arrow indicate mist (the broken line arrow indicates the flow direction of the refrigerant / insulating fluid).

A mist generating device 35 is provided outside the rectifying wire mesh 30. This mist generating device 35 is provided with one or a plurality of nozzle units 26 at a predetermined interval. In the example of FIG. 1, the nozzle unit 26 of the mist generating device 35 is provided outside the rectifying wire mesh 30, but may be provided inside the rectifying wire mesh 30. Further, the rectifying wire mesh 30 may be omitted.

The mist generator 35 is connected to a water source 16 such as a water pipe or a tank through a cooling water pipe 22 and a valve 13. When the mist generator 35 is activated, the mist 17 is sprayed from the nozzle unit 26 into particles of 80 microns or less, preferably 10 to 30 microns. Note that the smaller the particle size, the easier it is to vaporize, so the cooling effect also increases.
The mist 17 sprayed from the nozzle unit 26 of the mist generator 35 is vaporized in the air to cool the air 18 and lower the temperature of the air 18. The cooled fins 31 are cooled by blowing the cooled air 18 onto the cooling fins 31 by the blower fan 29.

The oil temperature of the transformer is defined as “temperature increase due to operation + external temperature”.
Lower the oil temperature of the transformer by lowering the temperature outside the object to be cooled. The blower fan 29
Thus, since the air 18 cooled by the mist 17 is blown onto the cooling fin 31 in a state where the sprayed mist 17 is completely vaporized, water droplets are not formed on the cooling fin 31. Therefore, it becomes possible to prevent corrosion and deterioration of the members of the electrical equipment due to water droplets. Further, the cooling effect is higher than when the air that has not been cooled by the mist 17 is simply blown by the cooling fins 31.

The method of separating the sprayed mist so as to vaporize before reaching the cooling fin portion 31 in the radiator 28 may be by visual observation. Further, the cooling target (for example, the cooling fin portion 31).
It is also possible to check the vaporization state by arranging a plate (a metal plate or the like is preferable) on the mist generating device side and observing the presence or absence of water droplets.

If the particle diameter of the mist is isolated, the mist is vaporized and water droplets do not adhere to the cooling fin portion 31. Therefore, the particle size of the mist may be about 100 microns, but in order to prevent the floor surface from getting wet, it is required to completely evaporate from the spraying until it reaches the floor surface. . From that point of view, the spraying force (force that mist jumps upward)
In view of the above, it is preferable to set the particle diameter to about 80 microns or less. Further, when the distance between the mist generating device 35 and the radiator 28 is set to the same distance as that of the prior art, the mist having a particle size of 40 microns may be reduced to about 10 microns when reaching the rectifying wire mesh 30. Observed. In addition, when the particle diameter was 10, 20, or 30 microns or less, water droplets did not adhere to the cooling fin portion 31. In the example of FIG. 1, mist 17 and air 18 cooled by mist 17 are passed through mixed air through blowing fan 29, but from the aspect of preventing water droplets from adhering to blowing fan 29, The particle size is desirably about 30 microns or less. Also,
The smaller the particle diameter, the easier it is to vaporize, and from the viewpoint of increasing the cooling effect with a smaller amount of water, the mist particle diameter is more preferably about 10 to 30 microns.

The example of FIG. 2 is an example in which the blower fan 29 provided in the radiator 28 exists on the opening portion side of the radiator 28. In this case, the air 18 cooled by the mist 17 sprayed from the nozzle unit 26 of the mist generator 35 being vaporized in the air is sucked by the blower fan 29 and blown to the cooling fins 31. The air is configured to escape to the exhaust port 33 after heat exchange with the cooling fin portion 31.

The example of FIG. 3 is an example in which the arrangement of devices that allow air to flow in the horizontal direction in FIG. 1 is arranged so as to flow air in the vertical direction (from the lower part of the screen to the upper part). That is, in FIG. 3, a cooling fin portion 31 is provided in the radiator 28. Further, a rectifying wire mesh 30 is provided at one side portion below the radiator 28, and a blower fan 29 is provided between the rectifying wire mesh 30 and the cooling fin portion 31. Further, the opening portion on the other side of the upper side of the radiator 28 faces the exhaust port 33 of the wall portion 32. The air is configured to be exhausted to the exhaust port 33 after heat exchange with the cooling fin portion 31 by the blower fan 29.

A mist generating device 35 is provided outside the rectifying wire mesh 30 on the lower side. When the mist generating device 35 is activated, the mist 17 from the nozzle unit 26 is sprayed as particles of 80 microns or less, preferably 10 to 30 microns. Note that the smaller the particle size, the easier it is to vaporize, so the cooling effect also increases. The mist 17 sprayed from the nozzle unit 26 of the mist generating device 35 is vaporized in the air, thereby cooling the air and lowering the temperature of the air. The cooled fins 31 are cooled by blowing the cooled air 18 onto the cooling fins 31 by the blower fan 29.

In the example of FIG. 3, the blast fan 29 has mist 17 and air 1 cooled by mist 17.
8 is mixed, but it is more desirable from the viewpoint of corrosion prevention to prevent water droplets from adhering to the blower fan 29 as well.

The example of FIG. 4 is an example in the case where the blower fan 29 provided in the radiator 28 exists on the opening portion side above the radiator 28. In this case, the air 1 cooled by the mist 17 sprayed from the nozzle unit 26 of the mist generator 35 being vaporized in the air.
8 is sucked by the blower fan 29 and blown to the cooling fin 31. The air is configured to escape to the exhaust port 33 after heat exchange with the cooling fin portion 31.

Note that the air heated by heat exchange with the cooling fins 31 has a light weight per unit volume, naturally moves to the upper part, and is discharged from the exhaust port 33 provided at the upper part. Therefore, since a natural air flow is generated, the arrangement of FIGS. 3 and 4 is preferable to FIGS. 1 and 2.

The example of FIG. 5 is an example when it arrange | positions in the vicinity of the inlet 36 of the building in which the object which cools the mist generator 35 was installed. In this case, the mist generator 35 is disposed in the vicinity of the air inlet 36 of the building, so that the air taken into the building is quickly cooled by the mist 17 sprayed from the mist generator. This lowers the oil temperature of the transformer defined by “temperature rise due to operation + outside air temperature” by lowering the temperature of the entire air inside the building. In this example, the fan 29 for blowing is provided. May not be provided. Moreover, you may arrange | position the fan 29 for ventilation above the heat radiator 28 like the example of FIG. Further, the arrangement of the radiator 28, the blower fan 29, and the exhaust port 33 may be as shown in the examples of FIGS.

Further, when a general type mist generating device 35 is adopted, the mist generating device 3 is more easily arranged.
5 is more preferable because it can be arranged. As such a mist generating device 35, for example, “Mist GYM (model MG-404)” manufactured by Kamakura Seisakusho, “Rainbow mist (model WM-500)” manufactured by Fukudaya Co., Ltd., manufactured by Origin Kogyo Co., Ltd. "Mist generator wide cool (model SPT-25006W)", "Super Eco Cool (model SFJ-1002)" manufactured by Super Industry Co., Ltd., and the like.

As in the example of FIG. 5, when the mist generating device 35 is arranged at the air inlet of the building, the entire air in the building can be cooled, so the arrangement of the mist generating device 35 and the object to be cooled is adjusted. This is preferable because it saves labor.

According to the present invention, the mist sprayed by the mist generating device is completely vaporized in the air, and the radiator is cooled by the cooled air. Therefore, water droplets do not adhere to the cooling fin portion in the radiator, and the problem of causing equipment corrosion is solved.

In addition, since water droplets do not adhere to the electrical equipment to be cooled (for example, a radiator of a transformer), there is no cooling water falling on the ground, and no waste water treatment equipment is required. Since the material does not get wet, there is an effect that the floor material is not deteriorated.

Furthermore, in the past, it was necessary to draw both the sprayed water and the sprayed water to the blower fan and blow it directly onto the cooling fin, so that the state where the blower fan is almost integrated with the electrical equipment It was necessary to install a cooling water injection part. However, in the case of the present invention, it is necessary for the mist sprayed from the mist generating device to completely evaporate before reaching the cooling fin portion, and therefore it is necessary to provide a certain distance. Therefore, when the installation work of the apparatus or the change of the fixed position is performed, it is possible to work away from the electrical equipment (for example, a transformer), and thus it is not necessary to stop the operation of the electrical equipment. Therefore, the installation work of the apparatus becomes simple and the operating rate of the transformer does not decrease. In addition, since the operation of the electric equipment is not stopped, the procedure for the operation stop and the work labor such as voltage detection and grounding are not necessary.

In addition, since the cooling water pipe can be installed in the mist generator at a location away from the electrical equipment, the risk of work is reduced. Moreover, since it is sufficient that the temperature outside the object to be cooled can be lowered, it is not necessary to integrally fix the mist generating device to the electrical equipment. Therefore, it becomes easy to remove the cooling device and change its installation position. Needless to say, if the mist generator is portable, the installation and removal can be further simplified.

If the mist generating device is arranged in the vicinity of the intake hole of the building where the electric equipment is arranged, the sucked air can be immediately cooled. Since the air taken into the building is always cooled, it is possible to reduce the temperature of the entire interior of the building. The oil temperature of the transformer is defined as “temperature rise due to operation + external temperature”. By placing the mist generator at such a position, the location of the electrical equipment, the electrical equipment and mist generation Regardless of the relative positional relationship with the device, there is also an effect that a cooling effect can be obtained by reducing the temperature inside the building (the temperature outside the transformer) as a whole.

In the above embodiment, the embodiment for cooling the electric equipment installed indoors has been described, but it goes without saying that a certain cooling effect can be obtained by the present invention even when it is arranged outside the building. Yes.

DESCRIPTION OF SYMBOLS 10 ... Transformer main body 13 ... Valve 16 ... Water source 17 ... Mist 18 ... Air 19 ... Piping 20 ... High temperature outlet 21 ... Low temperature inlet 22 ... Cooling water piping 26 ... Nozzle unit 28 ... Radiator 29 ... Air blower fan 30 ... Rectification wire mesh DESCRIPTION OF SYMBOLS 31 ... Cooling fin part 32 ... Wall part 33 ... Exhaust port 35 ... Mist generator 36 ... Intake port 51 ... Pump

Claims (4)

In the device that circulates the cooling and insulating fluid between the transformer body and the radiator by the piping and pump and cools it by the blower fan,
A mist generating device is provided separated to such an extent that the mist generated and sprayed is vaporized before the sprayed mist reaches the cooling fin portion in the radiator.
A cooling method for a transformer body, characterized in that air cooled by the heat of vaporization of the mist sprayed from the mist generating device is blown onto the cooling fin portion by the blower fan for cooling. In the device that circulates the cooling and insulating fluid between the transformer body and the radiator by the piping and pump and cools it by the blower fan,
A mist is generated and sprayed on the fan side opposite to the cooling fin portion in the radiator, and the sprayed mist is vaporized before reaching the cooling fin portion in the radiator. To provide a mist generator,
A method for cooling a transformer body, wherein air cooled by heat of vaporization of the mist sprayed from the mist generating device is sucked by the blowing fan and blown to the cooling fin portion to cool. The transformer body cooling method according to claim 1 or 2, wherein the mist generating device generates the mist having a particle diameter of 80 microns or less. Cooling method. The transformer body cooling method according to any one of claims 1 to 3, wherein the mist generating device is installed in the vicinity of an air inlet of a building in which the radiator is installed. Method of cooling the main body.

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