JP7294263B2 - Enclosed switchboard and dehumidification method inside it - Google Patents

Description

The present invention relates to a technique for dehumidifying the inside of a newly installed closed switchboard.

When a closed switchboard is newly installed outdoors, generally, a concrete foundation is built, a channel base is fixed thereon with anchors, and the closed switchboard is installed on the channel base. However, concrete releases water for several months after it hardens. When there is a heat-generating electrical device such as a transformer inside a closed switchboard, ventilation slits are often provided at the bottom of the switchboard. In addition, if an underground pit is provided, there will be a gap such as a cable entrance. For this reason, moisture generated from the concrete foundation is sucked in through the ventilation slits and gaps at the bottom, causing dew condensation inside the enclosed switchboard and possibly deteriorating the electrical equipment installed inside the enclosed switchboard.

Normally, during operation of a closed switchboard, a heating device such as a space heater is used to suppress the increase in humidity inside the closed switchboard in order to prevent deterioration of electrical equipment housed inside due to humidity. However, in the case of a newly installed closed switchboard, it takes time from installation of the closed switchboard to completion of receiving power from a commercial power source supplied from outside the closed switchboard by an electric power company or the like. Until then, it is conceivable to use storage batteries and temporary generators as power sources for humidity control devices, but space heaters and other heating devices consume a large amount of power, so they can be operated with storage batteries and temporary generators for a long period of time. It is difficult to keep it going. For this reason, it is necessary to suppress condensation inside the closed switchboard by another means until the heating device can be used.

A cooling type dehumidifier using the Peltier effect (Peltier element dehumidifier) is known as a dehumidifying means with low power consumption. Japanese Utility Model Laid-Open No. 59-81211 discloses the use of a Peltier element dehumidifier for dehumidifying the inside of a closed switchboard.

Japanese Utility Model Laid-Open No. 59-81211

Peltier dehumidifiers consume less power, so they may last longer even with storage batteries. However, it often takes several months from the installation of a new closed switchboard to the completion of power reception. In such a case, even if it is a Peltier element dehumidifier, it is difficult to continue to operate it with only the electricity stored in the storage battery. Also, if a small Peltier element dehumidifier with low power consumption is used, the storage battery can be extended longer, but the dehumidification capacity of the Peltier element dehumidifier is insufficient, making it difficult to suppress condensation inside the closed switchboard. .

The present invention was made to solve the above problems, and reduces the condensation inside the closed switchboard until it becomes possible to receive power from the commercial power supply. It aims at providing the technique which can avoid deterioration.

The closed switchboard according to the present invention includes a temporary bottom plate that is installed at a distance from the bottom of the closed switchboard and forms a closed space between it and the bottom, and dehumidifies the closed space without the need for power supply from a commercial power supply. and a dehumidifying means for

The dehumidifying means includes a solar panel, a storage battery that stores electricity generated by the solar panel, and a temporary dehumidifier that is installed in a closed space and operated by the power supplied from the storage battery. may The dehumidifier may be a Peltier element. The photovoltaic panel may be a temporary photovoltaic panel. In that case, the temporary photovoltaic panels may constitute a temporary roof installed in front of the door of the closed switchboard.

A method for dehumidifying a closed switchboard according to the present invention is a method for dehumidifying the inside of a newly installed closed switchboard. The method includes a first step, a second step and a third step. In the first step, a temporary bottom plate is installed at a distance from the bottom of the closed switchboard to form a closed space with the bottom. In the second step, the inside of the closed space is dehumidified by a dehumidifying means that does not require power supply from the commercial power supply until power reception from the commercial power supply connected to the closed switchboard becomes possible. Then, in the third step, the temporary bottom plate is removed from the closed switchboard when power supply from the commercial power supply to the heating device installed in the closed switchboard becomes possible.

The second step may include installing a temporary dehumidifier in the closed space and supplying power to the temporary dehumidifier from a storage battery connected to the photovoltaic panel. The third step may include removing the temporary dehumidifier together with the temporary bottom plate.

According to the present invention, the inside of the closed space formed between the bottom portion and the temporary bottom plate is dehumidified by the dehumidifying means that does not require power supply from the commercial power source until power reception from the commercial power source becomes possible. be. As a result, even if there is a small gap at the bottom of the closed switchboard, the temporary bottom plate blocks moisture rising from below the closed switchboard, thereby reducing dew condensation inside the closed switchboard. In addition, since the temporary bottom plate can be removed after power reception from the commercial power source becomes possible, there is no need to consider insulation from the main circuit section in the closed switchboard.

1 is a side view of a closed switchboard according to an embodiment of the present invention; FIG. 1 is a front view of a closed switchboard according to an embodiment of the present invention; FIG. 1 is a top view of a closed switchboard according to an embodiment of the present invention; FIG. 1 is a side sectional view showing the internal configuration of a closed switchboard according to an embodiment of the present invention; FIG. FIG. 5 is a plan view taken along the line AA of FIG. 4;

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

1 to 3 are diagrams showing the appearance of a closed switchboard 100 according to an embodiment of the present invention. As shown in the side view of FIG. 1 and the front view of FIG. 2, the closed switchboard 100 is installed on the channel base 4 fixed to the foundation 2 made of concrete.

In general, the front and rear surfaces of the closed switchboard 100 are provided with spaces for various operations. Utilizing this space, a temporary roof 10 is installed in front of the door 6 of the closed switchboard 100 when the closed switchboard 100 is installed. The temporary roof 10 has a frame consisting of a pair of telescopic connecting rods 17 extending in the width direction (horizontal direction in FIG. 2) and a pair of connecting rods 16 extending in the depth direction (horizontal direction in FIG. 1). The photovoltaic panel 12 is supported by the extendable connecting rod 17 . Connecting rods 16 on both sides of the photovoltaic panel 12 are supported at both ends by extendable supports 14 . The length of the strut 14 can be fixed by a pin or the like. The struts 14 and connecting rods 16, and the struts 14 and the photovoltaic panels 12 are connected by supports 18 forming a truss structure.

In FIG. 2 , between the left end connecting rod 16 and the left photovoltaic panel 12, between the left photovoltaic panel 12 and the central photovoltaic panel 12, and between the central photovoltaic panel 12 and the right photovoltaic panel 12 An inter-panel waterproof sheet 22 is stretched between the photovoltaic panel 12 and between the photovoltaic panel 12 on the right side and the connecting rod 16 on the right end. An inter-board waterproof sheet 20 is stretched between the photovoltaic panel 12 and the closed switchboard 100 . The board-panel waterproof sheet 20 can be fixed to the ventilation board under the eaves of the roof 8 of the closed switchboard 100 with hooks 24 . The temporary roof 10 including the photovoltaic panels 12 contributes to improving the environment for workers who perform pre-use inspections after the closed switchboard 100 is installed. For example, workability is improved by light shielding in fine weather and rainproofing in rainy weather.

The temporary roof 10 can fold the struts 14 against the photovoltaic panels 12 like a folding desk. The width of one board 6 of the closed switchboard 100 is about 700 mm to 1200 mm. The structure is such that the minimum distance Tsp between the columns 14 can be changed from 650 mm to 1150 mm by extending and contracting the telescopic connecting rod 17 so that the columns 14 do not interfere when the door 6 is opened. The width Tpv of the photovoltaic panel 12 is set to a width that can correspond to the minimum inter-support distance Tsp of 650 mm. In addition, when there is no work and there is no man, by folding the support 14 and placing the photovoltaic panel 12 on the ground, it will not fall down due to the wind, etc., and safety is ensured. It is also possible to install the photovoltaic panel 12 on the roof 8 of the closed switchboard 100 . However, with the configuration shown in FIGS. 1 and 2, there is no need to provide a structure for fixing the solar panel 12 to the roof 8, so the conventional standard roof 8 structure can be applied as it is. Furthermore, since it is not necessary to work at a high place, the safety of the worker when installing the solar panel 12 is improved.

4 is a side cross-sectional view showing the internal configuration of the closed switchboard 100 according to this embodiment, and FIG. 5 is a plan view taken along line AA in FIG. When the closed switchboard 100 is newly installed, the temporary bottom plate 30 is installed inside the closed switchboard 100 . The temporary bottom plate 30 is fixed in position by mounting brackets 32 while being spaced apart from the bottom 26 of the closed switchboard 100 . By installing the temporary bottom plate 30 , the inside of the closed switchboard 100 is divided into a board internal space 56 and a temporary drying space 58 . The temporary drying space 58 is a closed space sandwiched between the bottom portion 26 of the closed switchboard 100 and the temporary bottom plate 30 . A ventilation slit 28 is formed in the bottom portion 26, but the ventilation slit 28 is closed with a temporary cover 54 while the temporary bottom plate 30 is installed. Electric devices (not shown) used during operation of the closed switchboard 100 are arranged in the board internal space 56, except for some cables and electric wires that pass toward the underground pit. A temporary drying space 58 is provided between the concrete foundation 2 and the inner space 56 of the board.

A Peltier element dehumidifier 40 is installed in the temporary drying space 58 . The position where the Peltier element dehumidifier 40 is installed is a place near the door 6, that is, a place where it can be easily taken out later. An intake duct 42 and an exhaust duct 48 are attached to the Peltier element dehumidifier 40 . A fan 46 is mounted in the intake duct 42 to send air to the Peltier element dehumidifier 40 . Fan 46 is powered by storage battery 38 . The intake port 44 of the intake duct 42 and the exhaust port 50 of the exhaust duct 48 are provided at both diagonal corners of the temporary drying space 58 so that the air in the temporary drying space 58 is evenly dehumidified. .

The Peltier element dehumidifier 40 is attached with a drain pipe 52 for discharging dehumidified moisture. The drain pipe 52 extends through the bottom 26 of the closed switchboard 100 and out of the channel base 4 . In addition, the Peltier element dehumidifier 40 is arranged so that the cooling surface is substantially vertical in order to facilitate the flow of condensed water to the drain pipe 52 . Furthermore, the Peltier element dehumidifier 40 is arranged so that the intake side is higher than the exhaust side, and the drain pipe 52 is connected to the vicinity of the exhaust side of the Peltier element 20 . As a result, condensed water in the Peltier element dehumidifier 40 is easily drained from the drain pipe 52 .

Desirably, the dehumidifying ability of the Peltier element dehumidifier 40 is the ability to reduce the humidity of the temporary drying space 58 to a predetermined relative humidity or less. The predetermined relative humidity is preferably 85%. When the relative humidity of the space surrounded by the concrete foundation 2, the bottom 26 and the channel base 4 is 100%, it is derived from the ventilation rate from the gap of the temporary drying space 58 surrounded by the bottom plate 26, the temporary cover, the temporary bottom plate, etc. The required dehumidification capacity is calculated from the assumed ventilation volume.

The smaller the volume of the temporary drying space 50 is, the lower the dehumidification capacity required of the Peltier element dehumidifier 40 is. However, since the short side of a commercially available Peltier dehumidifying element is about 50 mm, the distance between the bottom part 26 and the temporary bottom plate 30 is desirably 50 mm or more. With such a configuration, even in a space where the distance between the bottom part 26 and the temporary bottom plate 30 is relatively small compared to the area of the bottom part 26, the air in the temporary drying space 58 can be efficiently dehumidified, and the temporary drying can be performed. The height dimension of the space 50 can be reduced.

A storage battery 38 is installed in the temporary drying space 58 . The storage battery 38 is connected to the Peltier element dehumidifier 40 by the power cable 36 . In other words, power for operating the Peltier element dehumidifier 40 is supplied from the storage battery 38 . Also, the storage battery 38 is connected to the photovoltaic panel 12 by a charging cable 34 . That is, the storage battery 38 is charged with electricity generated by the photovoltaic panel 12 .

The temporary bottom plate 30 is removed after power reception from the commercial power supply becomes possible. Further, since the Peltier element dehumidifier 40 is a temporary dehumidifier, a set including the Peltier element dehumidifier 40, the intake duct 42 and the exhaust duct 48 is also removed. Furthermore, the temporary cover 54 covering the ventilation slit 28 is also removed. After that, by operating a heating device such as a space heater (not shown) installed in the closed switchboard 100, the increase in humidity in the temporary drying space 58 is suppressed.

According to the closed switchboard 100 configured in this way, the temporary drying space 58 is operated by the Peltier element dehumidifier 40 that operates on the electricity generated by the photovoltaic panel 12 until power reception from the commercial power supply becomes possible. The inside is dehumidified. As a result, even if there is some gap in the bottom part 26 of the closed switchboard 100, the temporary drying space 58 blocks the moisture coming up from the concrete foundation 2, and the dew condensation in the space 56 inside the board can be reduced. As a result, it is possible to prevent deterioration due to humidity of the electric appliances arranged in the space 56 inside the panel. Moreover, since the electricity generated by the photovoltaic panel 12 is stored in the storage battery 38, dehumidification is possible even at night. Since the temporary drying space 58 is a narrow space, it also has the advantage of being able to dehumidify with a small amount of electric power. Furthermore, since the temporary drying space 58 only needs to accommodate the Peltier element dehumidifier 40, the fan 46, the intake duct 42, and the exhaust duct 48, the dimension in the height direction can be reduced, and the original electrical equipment can be placed on the panel. The inner space 56 is not pressed.

Furthermore, since the temporary bottom plate 30 and the set of devices in the temporary drying space 58 can be removed after power reception from the commercial power supply becomes possible, consideration should be given to insulation from the original electric equipment in the closed switchboard 100. No need. In addition, since the set of devices (including the temporary cover 54) that is no longer needed including the Peltier element dehumidifier 40 can be removed, they do not become an obstacle, and the removed set of devices can be reused at another site. can be utilized. Similarly, the temporary roof 10 equipped with the photovoltaic panels 12 can be removed and reused at another site after power reception from the commercial power supply becomes possible. Note that the commercial power supply is an example of an external power supply.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications can be made. For example, the dehumidifier may be a compressor-type or zeolite-type dehumidifier. Also, a large amount of desiccant may be placed in the temporary drying space 58 instead of the dehumidifier.

2 Concrete foundation 4 Channel base 6 Door 8 Roof 10 Temporary roof 12 Photovoltaic panel 14 Strut 16 Connecting rod 17 Telescopic connecting rod 18 Support 20 Waterproof sheet between panels 22 Waterproof sheet between panels 24 Hook 26 Bottom 28 Ventilation slit 30 Temporary construction Bottom plate 32 Mounting bracket 34 Charging cable 36 Power cable 38 Storage battery 40 Peltier element dehumidifier 42 Intake duct 44 Intake port 46 Fan 48 Exhaust duct 50 Exhaust port 52 Drain pipe 54 Temporary cover 56 Internal space 58 Temporary drying space 100 Closed switchboard

Claims (7)

A closed switchboard,
a temporary bottom plate installed at a distance from the bottom of the closed switchboard and forming a closed space with the bottom;
and dehumidifying means for dehumidifying the inside of the closed space without requiring power supply from an external power source. The dehumidifying means is
solar panel and
a storage battery for storing electricity generated by the photovoltaic panel;
2. The closed switchboard according to claim 1, further comprising a temporary dehumidifier installed in said closed space and operated by electric power supplied from said storage battery. 3. The closed switchboard according to claim 2, wherein said temporary dehumidifier is a Peltier element. 4. The closed switchboard according to claim 2, wherein the photovoltaic panel is a temporary photovoltaic panel. 5. The closed switchboard according to claim 4, wherein the temporary photovoltaic panel constitutes a temporary roof installed in front of the door of the closed switchboard. A dehumidification method for dehumidifying the inside of a newly installed closed switchboard, comprising:
a first step of installing a temporary bottom plate at a distance from the bottom of the closed switchboard and forming a closed space between the temporary bottom plate and the bottom;
a second step of dehumidifying the closed space by a dehumidifying means that does not require power supply from the external power supply until power reception from the external power supply connected to the closed switchboard becomes possible;
and a third step of removing the temporary bottom plate when power supply from the external power supply to the heating device installed in the enclosed switchboard becomes possible. . The second step is
installing a temporary dehumidifier in the closed space;
and supplying power to the temporary dehumidifier from a storage battery connected to a photovoltaic panel;
The third step is
7. The dehumidifying method in a closed switchboard according to claim 6, further comprising removing the temporary dehumidifier together with the temporary bottom plate.

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