JPH11283845A - Cooling apparatus for indoor transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling apparatus for indoor transformer which is able to cool a transformer, without raising the temperature in an electric room. SOLUTION: A transformer housing box 20 which houses a transformer 12 is provided in an electric room 11, and the indoor machine 21 of a cooling device is positioned above the box 20. The outdoor machine 22 of the cooling apparatus is positioned on the outside of the box 20 and is connected to the indoor machine 21 via a pipeline 23. The transformer 13 is cooled without raising the temperature of the electric room 11, by absorbing the heat generated from the transformer 13 in the box 20 by means of the indoor machine 21 and discharging the heat to the outside from the outdoor machine 22.

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 an indoor transformer for cooling a transformer installed in an electric room provided inside a building such as an office building or an apartment.

[0002]

2. Description of the Related Art Transformers installed in power receiving and distribution facilities generate heat (iron loss and copper loss) in accordance with load power and generate heat.
Its temperature rises. The transformer is cooled by radiating heat through the surrounding air, but when the transformer is installed in an electric room provided indoors, the temperature of the air in the room rises due to heat radiation from the transformer. As a result, the difference between the temperature of the air around the transformer and the temperature of the transformer becomes smaller, so that it may not be possible to cool the transformer to a sufficiently low temperature.

[0003] If the transformer cannot be cooled, not only its performance cannot be fully exhibited, but also the deterioration of the insulator used in the transformer may be accelerated, and the life of the transformer may be shortened. . In addition, when the temperature in the electric room rises due to the heat radiation from the transformer, there is a problem that the working environment of the worker at the time of maintenance and inspection is deteriorated. Further, when the temperature in the electric room rises, malfunctions occur in the attached devices near the transformer, and not only can the performance of the attached devices not be sufficiently exhibited, but also the cause of shortening the service life thereof. There is also the problem of becoming. Therefore, when a transformer is installed in an indoor electric room, outdoor air is taken into the electric room to promote heat radiation from the transformer and to suppress a rise in temperature in the electric room.

FIG. 4 schematically shows a configuration example of power receiving and distribution equipment in an electric room provided inside a building such as an office building or a condominium. In FIG.
Is the door of the electric room. In this example, two transformers 3, 3 'are installed substantially at the center of the electric room, and low-voltage boards 4, 4' are arranged on the sides of the transformers 3, 3 ', respectively. In addition, a power receiving panel 5 is disposed near the transformer 3 installed at a position distant from the entrance of the electric room 1 in a state opposite to the low voltage panel 4, and a corner of the electric room near the power receiving panel 5 is provided. A fire extinguisher 6 that can be inspected and operated from outside the electric room is disposed in the section.

[0005] Among the corners of the electric room 1, an air supply ventilation device 7 is disposed in a corner portion opposite to the fire extinguishing equipment 6 with the door 2 interposed therebetween, and the air supply ventilation device 7 is disposed. An exhaust ventilation device 8 is disposed at another corner diagonally opposite the corner thus set.

In this power receiving and distributing facility, the air in the electric room whose temperature has been increased by the heat generated from the transformers 3 and 3 'is exhausted through the exhaust ventilator 8, and the outside air is supplied from the air supply ventilator 7 into the electric room. To suppress the rise in temperature in the electric room. Thus, when cooling the transformer by ventilating the electric room,
In order to keep the temperature in the electric room low, it is necessary to increase the difference between the room temperature and the supply air temperature, or to increase the amount of ventilation provided by the air supply ventilation device and the exhaust ventilation device.

[0007]

In a power receiving / distributing facility installed indoors in a building or the like, a device such as a switchboard is installed in the vicinity of the transformer, so that the upper limit of the temperature in the electrical room is set to three.
It is necessary to suppress the temperature to about 5 to 40 ° C. In a season where the outside air temperature is low, it is easy to keep the temperature in the electric room within the above range without increasing the ventilation volume so much. However,
In summer, when the difference between the temperature in the electric room and the supply air temperature decreases due to the rise in outside air temperature, it is necessary to increase the amount of ventilation to maintain the temperature in the electric room in the above range, so throughout the year In order to keep the upper limit of the temperature in the electric room within the above range, the air supply ventilation device 7 and the exhaust ventilation device 8
, It is necessary to use a large-sized one with a large air flow.

When a transformer is installed in a room,
Excitation sound generated from the transformer is reflected in the room and its sound pressure rises, and the amount of noise leaking outside through the ventilation system for air supply and exhaust increases. Therefore, when there is noise regulation around the electric room, it is necessary to take noise suppression measures for the air supply ventilation device 7 and the exhaust ventilation device 8 in order to suppress noise leakage. Also, if the ventilation volume of the ventilation device is increased, the noise generated by the ventilation fan increases, so that the air supply ventilation device 7 and the exhaust ventilation device 8 are also provided with soundproofing measures against the noise generated by the blower. Need to be kept.

Therefore, when the transformer is cooled by ventilating the electric room, the air supply ventilation device 7 and the exhaust ventilation device 8 become very large and uneconomical devices. There was a problem that the cost of the power distribution equipment was increased. Further, as the size of the air supply ventilation device 7 and the exhaust ventilation device 8 increases, the space occupied by them in the electric room increases, so that it is necessary to secure an electric room having a large area, which is uneconomical. there were.

An object of the present invention is to provide a cooling device for an indoor transformer capable of efficiently cooling a transformer without using a large-sized intake device and a ventilation device. Another object of the present invention is to provide a cooling device for an indoor-installed transformer that can efficiently cool a transformer without leaking loud noise to the outside.

[0011]

SUMMARY OF THE INVENTION The present invention relates to a cooling device for an indoor-installed transformer for cooling a transformer installed in an electric room provided inside a building. And a transformer storage box that houses the transformer inside and an indoor unit that is placed in the transformer storage box and an outdoor unit that is placed in a place that is thermally shielded from the electric room. And a cooling device for cooling the inside of the transformer storage box.

In the power receiving and distribution equipment provided with the cooling device, when the transformer generates heat, the temperature of the air around the transformer rises. The air that has become lighter due to the rise in temperature moves to the upper part in the transformer storage box and is cooled by the indoor unit of the cooling device. The air cooled by the indoor unit moves to a lower part in the transformer storage box. In this way, convection always occurs in the transformer storage box, and the transformer is continuously cooled.
The heat absorbed by the indoor unit is transported to the outdoor unit side by the refrigeration cycle and discharged to the outside.

As described above, according to the present invention, the transformer is stored in the transformer storage box, and the indoor unit of the cooling device is arranged in the transformer storage box, so that the temperature is increased by the heat generated by the transformer. Since the air in the transformer storage box that has risen is cooled by the cooling device, the transformer can be cooled without increasing the temperature in the electric room. Therefore,
ADVANTAGE OF THE INVENTION According to this invention, since it is not necessary to provide a large-sized air supply ventilation apparatus and an exhaust ventilation apparatus in order to ventilate an electric room, the power receiving and distribution equipment can be reduced in size.

Further, in the present invention, since the noise generated by the transformer can be cut off from the outside by the transformer storage box, the noise of the transformer can be prevented from leaking outside the electric room.

Although the present invention does not hinder the provision of a ventilator for ventilating the electric room, the ventilator in the electric room does not need to consider cooling the transformer. It is only necessary to have a minimum amount of air to replace the air, and no noise reduction measures are required.

The outdoor unit of the cooling device may be housed in an outdoor unit storage box provided separately from the transformer storage box, or may be arranged outside the electric room.

[0017] The outdoor unit storage box may be arranged in the electric room or outside the electric room.

When the outdoor unit is placed in an outdoor unit storage box provided separately from the transformer storage box, a ventilator for forcibly replacing air in the outdoor unit storage box with air outside the electric room. Is provided.

As described above, if the outdoor unit is stored in the outdoor unit storage box provided separately from the transformer storage box, the noise generated by the outdoor unit can be cut off from the outside. In addition to the fact that the storage box can block the noise of the transformer, the noise of the transformer can be reduced.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a plan view showing a cross section of an electric room of a power receiving and distribution facility provided with a transformer to which a cooling device according to the present invention is applied, and showing an example of arrangement of devices inside the electric room. FIG. 2 is a sectional view showing a transformer provided in the power receiving and distribution facility of FIG. 1 and a configuration example of a cooling device thereof.

1 and 2, reference numeral 11 denotes an electric room provided with a door 12, 13 and 13 'are transformers arranged substantially at the center of the electric room, and 14 and 14' are sides of the transformers 13 and 13 '. A low-voltage board 15 is disposed on the opposite side of the low-pressure board 14 with the transformer 13 interposed therebetween, and a power receiving board 16 is a fire-extinguishing facility.

In the present invention, transformer storage boxes 20 and 20 'having a sealed structure and having a transformer storage space S therein are provided in the electric chamber 11, and the transformer storage spaces in these storage boxes are respectively provided. Transformers 13, 13 'are arranged.
The transformer storage boxes 20 and 20 ′ are provided for the purpose of isolating heat and noise generated by the transformers 13 and 13 ′ from the space in the electric room 11.

The transformers 13 and 13 'are supported by the gantry 18 in the transformer storage box and arranged at a position slightly higher than the floor of the electric room 11, and the lower parts of the transformers 13 and 13' and the electric room are connected to each other. Air passage 19 for flowing air between the floor and the floor
Are formed.

As the transformers 13 and 13 ', a molded transformer in which a coil is molded with an insulating resin, an oil-filled transformer in which a transformer main body is housed together with insulating oil in a tank provided with a radiator, or a radiator Such as a gas insulated transformer that houses the transformer body together with insulating gas in a tank equipped with
Any type can be used.

The transformer storage boxes 20, 20 'are installed on the floor of the electric room 11 without the bottom plate, and are mounted on the transformers 13, 13'.
′ May be covered from the outside, having a bottom plate, and the transformers 13,
13 'may be supported.

In the case where a bottom plate is provided in the transformer storage boxes 20 and 20 'and the transformer stored therein is supported by the bottom plate, the transformer storage box storing the transformers is stored in the factory as it is in the field. Can be installed in an electric room, so that the transformer can be easily assembled in the electric room.

In the illustrated example, the transformer storage boxes 20, 20 '
The bottom plate is omitted. When the bottom plate of the transformer storage box is omitted as described above, construction when applying the present invention to the transformer of the existing power receiving and distribution equipment can be facilitated.

It is preferable that the transformer storage boxes 20 and 20 ′ have a sealed structure. However, the “sealed structure” does not mean a structure that maintains airtightness, but actively encourages internal and external air. This means that there is no vent hole for circulation, and there may be some gaps in some parts. For example, when a transformer storage box 20, 20 ′ having no bottom plate is used, a slight gap may exist between the lower ends of the transformer storage boxes 20, 20 ′ and the floor of the electric room 11. No problem.

In the present invention, in order to cool the transformers 13 and 13 ', a cooling device is used that transfers indoor heat to the outside by a refrigeration cycle to cool the indoor air. The cooling device used in the present invention is the same as a commonly used separate type cooling device, and among the devices constituting the refrigeration cycle, the indoor devices including the evaporator and the decompression device are housed in a cabinet. An indoor unit, an outdoor unit containing an outdoor device including a compressor, a condenser, and a filtration device in a case, and a pipe connecting between the indoor unit and the outdoor unit. You.

In the illustrated example, the transformer storage boxes 20, 20 '
Inside, indoor units 21 and 21 'of the cooling device are arranged, and an outdoor unit 22 common to these indoor units is arranged outdoors. In the illustrated example, the indoor units 21 and 21 'are respectively disposed in the upper portions of the transformer storage boxes 20 and 20', and are supported by the upper portions or the ceiling portions of the side walls of the transformer storage boxes 20 and 20 '. . Indoor units 21 and 21 'and outdoor unit 22
Between the side walls of the transformer storage boxes 20 and 20 ′ and the electric chamber 1.
1 are connected by pipes 23 and 23 'penetrating through the side wall.

In the above-mentioned power receiving and distribution equipment, the transformer 13,
When 13 'generates heat, the temperature of the air around the transformers 13, 13' rises. The air that has become lighter as the temperature rises,
It moves to the upper part inside the transformer storage boxes 20, 20 'and is cooled by the indoor units 21, 21' of the cooling device. Indoor unit 21,
The air cooled by 21 ′ is supplied to the transformer storage boxes 20, 2
Since it moves to the lower part inside 0 ', convection always occurs in the transformer storage box, and the transformers 13 and 13' are continuously cooled by this convection. The heat absorbed by the indoor units 21 and 21 'is transported to the outdoor unit 22 through the pipes 23 and 23',
The air is discharged from the outdoor unit to the outside.

As described above, in the power receiving and distribution equipment shown in FIGS. 1 and 2, the transformers 13 and 13 'are stored in the transformer storage boxes 20 and 20', respectively.
The indoor units 21 and 21 'of the cooling device are arranged in 0 and 20', and the air in the transformer storage boxes 20 and 20 'whose temperature has increased due to the heat generated by the transformers 13 and 13' is cooled by the cooling device. As a result, the transformers 13 and 13 ′ can be cooled without increasing the temperature in the electric chamber 11. Therefore, a large air supply ventilation device 7 as used in the example shown in FIG.
In addition, since it is not necessary to provide the exhaust ventilation device 8, the power receiving and distribution equipment can be reduced in size.

Further, according to the present invention, since the noise generated by the transformers 13 and 13 ′ can be cut off by the transformer storage boxes 20 and 20 ′, the noise of the transformer leaks out of the electric room 11. Can be prevented.

In the above example, the two indoor units 21 and 21 '
Although one outdoor unit 22 is provided in common to the above, an outdoor unit may be provided for each indoor unit.

In the above example, the outdoor unit 22 is arranged outdoors. However, the outdoor unit 22 only needs to be arranged in a place that is thermally shielded from the electric room 11 and is adjacent to the electric room 11. It may be located in the room.

The outdoor unit 22 includes transformer storage boxes 20 and 2
It may be stored in an outdoor unit storage box provided separately from 0 ′. FIG. 3 shows an example in which the outdoor unit 22 is stored in the outdoor unit storage box. In this example, the outdoor unit storage box 2 is placed in the electric room 11 in a state of being adjacent to the transformer storage box 20.
The outdoor unit 22 is disposed in the outdoor unit storage box 25.

In the illustrated example, the outdoor unit storage box 25 is disposed between one side wall 20a of the transformer storage box 20 and the side wall 11a of the electric chamber 11 opposed to the side wall 20a. The side wall 25a on the side of the transformer 13 is
Close to the side wall 20a of the transformer 2 and the side wall 2 opposite to the transformer 13
5b is arranged in close contact with the side wall 11a of the electric chamber. The indoor unit 21 and the outdoor unit 22 are connected to each other via a pipe 23 penetrating the side wall 20 a of the transformer storage box 20 and the side wall 25 a of the outdoor unit storage box 25.

An intake hole h1 and an exhaust hole h2 are provided in the lower and upper portions of the side wall 25b of the outdoor unit storage box, respectively. The intake port h1 and the exhaust port h2 are communicated with the outside through an intake port h1 'and an exhaust port h2' which penetrate the side wall 11a of the electric chamber 11, respectively. In the exhaust hole h2,
A blower 26 for sending out the air in the outdoor unit storage box to the outside is attached, and louvers 27 and 28 are attached to the outdoor openings of the intake port h1 'and the exhaust port h2', respectively. In this example, the intake holes h1, h1 'and the exhaust holes h
2, h2 'and the blower 26, the outdoor unit storage box 25
A forced-ventilation device is configured to forcibly replace air in the interior with air outside the electric room.

In the example shown in FIG. 3, the blower 26 is attached to the exhaust hole h2, but a blower for introducing outside air to the intake hole h1 may be attached.

FIG. 3 shows only the cooling device for one transformer 13, but an indoor unit 21 ′ disposed in a transformer storage box 20 ′ containing the other transformer 13 ′ is connected through a pipe (not shown). It is connected to the outdoor unit 22 in the outdoor unit storage box 25.

When an outdoor unit is individually provided for each of a plurality of indoor units arranged in a plurality of transformer storage boxes each storing a plurality of transformers, each of the plurality of transformer storage boxes has a plurality of transformer units. An outdoor unit storage box may be disposed nearby and one outdoor unit may be disposed therein, or a plurality of outdoor units may be disposed in a common outdoor unit storage box.

In each of the above examples, the cooling device is preferably operated only when necessary, or is operated so as to maintain the temperature of the air in the transformer storage box at a set value. To operate the cooling device only when necessary, the transformers 13 and 1
A temperature sensor for detecting the temperature of 3 ′ or the temperature of the air in the transformer storage space S, and a control device for controlling the energization of the cooling device in accordance with the detection output of the temperature sensor are provided. The operation of the cooling device may be performed only when the temperature of the heaters 13 and 13 'or the temperature of the air in the transformer storage box exceeds a set value.

In order to operate the cooling device so as to maintain the temperature inside the transformer storage box at a set value, a temperature controller similar to that used in a normal cooling device may be provided. As described above, by providing a control device that controls the operation of the cooling device according to the temperature of the transformer or the temperature in the transformer storage box, it is possible to prevent unnecessary operation or excessive operation of the cooling device from being performed. Therefore, the life of the cooling device can be extended.

When the temperature rise of the transformer is predicted in advance from the load demand curve or the like, the operation of the cooling device is started before the temperature of the transformer actually rises based on the prediction. Predictive control may be performed so as to prevent a rise in the temperature of the transformer.

[0045]

As described above, according to the present invention, the transformer is housed in the transformer housing box, and the indoor unit of the cooling device is arranged in the transformer housing box to generate heat of the transformer. Thus, the air in the transformer storage box whose temperature has risen is cooled by the cooling device, so that the transformer can be cooled without increasing the temperature in the electric room. In addition, since the temperature rise in the electric room can be prevented, the working environment in the electric room can be prevented from deteriorating. Can be fully demonstrated,
In addition, the life of the attached equipment can be extended. Therefore, according to the present invention, it is not necessary to provide a large air supply ventilation device and an exhaust ventilation device in order to ventilate the electric room, so that the size of the power receiving and distribution equipment can be reduced.

Further, according to the present invention, since the noise generated by the transformer can be cut off from the outside by the transformer storage box, the noise of the transformer can be prevented from leaking to the outside of the electric room.

Further, according to the present invention, since the cooling of the transformer can be forcibly performed, the temperature of the insulator of the transformer can be reduced when the overload operation of the transformer is required. There is an advantage that overload operation can be performed without difficulty without excessively increasing the load.

[Brief description of the drawings]

FIG. 1 is a plan view showing a cross section of an electric room of a power receiving and distributing facility provided with a transformer to which a cooling device according to the present invention is applied, and showing arrangement of devices inside the electric room.

FIG. 2 is a cross-sectional view showing a transformer provided in the power receiving and distribution facility of FIG. 1 and a configuration example of a cooling device thereof.

FIG. 3 is a sectional view showing a modification of the cooling device according to the present invention.

FIG. 4 is a plan view showing an example of a configuration of a cooling device for a transformer provided in a conventional power receiving and distribution facility, in which an electric room is sectioned.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Electric room 13, 13 'Transformer 20, 20' Transformer storage box 21, 21 'Indoor unit of a cooling device 22 Outdoor unit of a cooling device 23, 23' Piping which connects between an indoor unit and an outdoor unit 25 Outdoor Machine storage box 26 blower

Claims (3)

[Claims] 1. An indoor transformer cooling device for cooling a transformer installed in an electric room provided inside a building, wherein the transformer is disposed in the electric room and houses the transformer therein. A transformer having a storage box and an indoor unit disposed in the transformer storage box and an outdoor unit disposed in a place that is thermally shielded from the electric room. A cooling device for an indoor-installed transformer, comprising: a cooling device for cooling the inside of a storage box. 2. The outdoor unit is housed in an outdoor unit storage box provided separately from the transformer storage box, and ventilation for forcibly replacing the air in the outdoor unit storage box with the air outside the electric room. The cooling device for an indoor installed transformer according to claim 1, further comprising a device. 3. The cooling device for an indoor transformer according to claim 1, wherein the outdoor unit is installed outside the electric room.