JPS5956804A - Moisture removing device for enclosed switchboard - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to a dehumidifying device used in a closed type switchboard.

[Technical background of the invention]

A conventional example will be explained with reference to FIGS. 1 and 2. Reference numeral 1 in the figure indicates a closed type switchboard (hereinafter referred to as the board). This panel 1 is formed with an inlet IA for sucking in outside air and cooling the inside of the panel, and an exhaust port IB for exhausting the sucked outside air.

In other words, when the relative humidity inside the panel 1 becomes 75 coefficients R1 (or higher), the leakage resistance of the creeping surface of the electrical equipment (not shown) housed in the panel 1 tends to decrease due to fouling of the insulation, which tends to increase the leakage current. If the above-mentioned leakage current increases, depending on the voltage used, there is a risk of insulation deterioration or accidents such as insulation contamination and creeping.In order to prevent these accidents, a dehumidifying device is installed inside the panel 1. Each other is established.

The dehumidifying device 2 is constructed by connecting in series a humidity detector 3 with a contact point installed in the center of the panel 1, a space heater 4 provided at the bottom of the panel 1, and a power source 5 provided outside the panel 1. When the contact humidity detector 3 detects a preset high humidity, for example, 70% RF, the contact turns ON, power is supplied to the space heater 4, and the space heater 4 starts generating heat. When low humidity, for example 60% RH is detected, the contact will open.
The fi'F' L space heater 4 is configured to stop generating heat. This operation is repeated thereafter to prevent the humidity inside the board J from rising. The current situation is shown in Figure 2. In the figure, (a) shows the time change in outside air humidity, (→ shows the time change in the internal temperature of the panel when dehumidified by the dehumidifier ft2 described above, and (b) shows the time change in the outside air humidity. The temperature inside the panel 1 is shown in the case that there is no temperature.

[Problems with background technology]

According to the above configuration, for example, when trying to control the humidity inside the panel 1 to 754 RH or less, the high humidity detected by the contact humidity detector 3 is set to about 70% RH. In this case, it may not be possible to control the humidity inside the panel 1 to 75 degrees or less. In other words, since the humidity detector 3 with contacts is installed in the center of the panel 1, if the outside air humidity suddenly increases, a difference in response time will occur due to the increase in humidity entering the panel 1 from the inlet IA, as shown in Fig. 2P. High humidity 704R with contact humidity detector 3 set as shown in the dot
By the time H is detected, the temperature inside the panel 1 may have already risen to 804 RI (approximately 804 R.
According to experimental results, the repetition time is approximately 1 hour. If the relative humidity continues for a long time at 75% RH or more, the number of repetitions will increase and the life characteristics of contacts etc. will be shortened.

[Purpose of the invention]

The purpose of the present invention is to eliminate the response time difference of humidity detectors, prevent the humidity inside the panel from exceeding, for example, 75% RH, and prevent the situation where the humidity inside the panel continues to be 75%. It is an object of the present invention to provide a dehumidifying device for a closed type power distribution board, which can continue dehumidifying with a response operation of - times, prevent repeated ON-OFF cycles, and extend the life of contacts, etc.

[Summary of the invention]

The dehumidifying device for a closed power distribution board according to the present invention includes a humidity detector installed near an outside air inlet in the closed power distribution board, and a humidity detector installed in the closed power distribution board that detects a preset high humidity. This configuration includes a heater that starts generating heat when the humidity is high, and stops generating heat when the humidity detector detects a preset low humidity.

In other words, the humidity detector is provided near the inlet in the closed type power distribution board to eliminate the difference in response time of the humidity detector.

Therefore, for example, in order to divide the internal humidity to 75% or less, e.g., if the high humidity detected by the humidity detector is set to 70%, if the humidity detector detects 70% as in the conventional case, the panel The internal humidity does not rise to nearly 80%, but can be reliably controlled to below 75%, and even if the insulation surfaces of the electrical equipment housed in the panel become soiled, the insulation will not deteriorate. Therefore, it is possible to prevent creepage accidents and the like at the working voltage. Furthermore, if the humidity detector is installed near the intake port, which is close to the outside air, and the outside air humidity continues to be 754 RH, the humidity detector will continue to detect high humidity, so it will not be possible to
There is no need to repeat N-OF'F many times, and the life characteristics of contacts etc. can be extended.

[Embodiments of the invention]

An embodiment of the present invention will be described with reference to FIGS. 3 and 4. The code 101 in the figure is a closed type power distribution board (hereinafter referred to as the board)
shows. This panel 101 is formed with an inlet 101 and 101B for sucking in outside air and cooling the inside of the panel. That is, when the relative humidity inside the panel 101 exceeds 75% R), the leakage resistance of the electrical equipment (not shown) housed in the panel 10 due to fouling of the insulation decreases, thereby increasing the leakage current. If the above leakage current increases, depending on the voltage used, accidents such as insulation deterioration or insulation contamination and creeping flash may occur.Therefore, in order to prevent these accidents, there are A dehumidifier 102 is provided.

The dehumidifier 102 has a humidity detector 103 with a contact installed near the inlet 101 inside the panel 10. It is constructed by connecting in series a space heater 104 provided in the lower part of the panel 101 and a power source 1θ5 provided outside the panel 10.

When the humidity detector 103 with a contact detects a preset high humidity, for example 70% it, the contact turns ON, power is supplied to the space heater 104, and the space heater 04 starts generating heat. The inside of the panel 101 is dehumidified.Then, the humidity inside the panel 10) gradually decreases, and when the humidity detector 103 with contacts detects a preset low humidity, for example, 60% RE, the contact turns OFF and the space heater 104 The structure is such that the heat generation is stopped, and the subsequent operation is repeated to prevent the humidity inside the board 1 from increasing.

According to the dehumidifying device 102 having the above configuration, for example, when the outside air humidity is 7Q%R)fK, the humidity inside the panel 101 also gradually increases. At this time, the humidity detector 103 installed near the inlet Jf)JA quickly detects this and turns on the contact.
do. As a result, the space heater 104 also quickly starts heating and dehumidifies the inside of the panel 101.Next, a case where the outside air humidity continues to be 75 degrees RH will be described. In this case, the humidity detector JO,9 with a contact will continue to detect the preset high humidity within the limit υ when the outside air humidity is 75% R), so the contact will turn ON once and then turn OFF'.
There's nothing to do. In other words, ON-OFF as before
There is no need to repeat this many times to shorten the life of the contacts, etc., and heating of the space heater 104 can be continued with one ON operation. This situation is shown in FIG. In the figure, (b) shows the change in outside air humidity over time, and (e) shows panel 1.
01 shows the change in internal humidity over time. As is clear from this, there is no repeated ON-OF'F operation as shown in FIG. 2(c), and dehumidification can be continued with only one response operation. Then, the humidity of the outside air decreases and the contact humidity sensor 10.9 indicates low humidity (60
96R)(), the space heater 104 stops generating heat.

That is, by providing the humidity detector 103 with a contact near the inlet 101 inside the panel 10, the humidity detector 10 with a contact
3 response time difference can be eliminated.

Therefore, for example, when the high humidity detected by the contact humidity detector 103 is set to 70% RH in order to control the humidity inside the board 101 to 75 RH or less, the contact humidity detector 103 detects 70% RH as in the conventional case. When detecting RH, board 101
The internal humidity will not rise to nearly 80% and can be reliably controlled to 75% RH or less. As a result, even if the creeping surface of the insulating material of the electrical equipment housed in the panel 101 is contaminated, the insulation will not deteriorate, and it is possible to prevent creeping accidents and the like at the working voltage. In addition, since the humidity detector 103 with a contact point was installed near the inlet 101 near the outside air, for example, the outside air humidity was 75%R.
If H continues, the contact humidity detector 103 continues to detect high humidity, so it does not repeat 0N-OFF many times as in the conventional case, and the life characteristics of the contacts etc. can be extended. .

〔Effect of the invention〕

The dehumidifying device for a closed power distribution board according to the present invention includes a humidity detector installed near an outside air inlet in the closed power distribution board, and a humidity detector installed in the closed power distribution board that detects a preset high humidity. This configuration includes a heater that starts generating heat when the humidity is high, and stops generating heat when the humidity detector detects a preset low humidity.

That is, the structure attempts to eliminate the difference in response time of the humidity detectors by providing the humidity detectors near the inlet of the closed type switchboard.

Therefore, for example, when controlling the humidity inside the panel to 75 degrees or less and detecting 70%, the humidity inside the panel can be reliably controlled to 75 degrees or less without rising to nearly 80%. Even if the creeping surface of the insulating material of the electrical equipment is contaminated, the insulation will not deteriorate, and accidents such as creeping flashover at the working voltage can be prevented.

In addition, by installing the humidity detector near the inlet near the outside air, for example, if the outside air humidity continues to be 75% RH, the humidity detector will continue to detect high humidity, so it will not turn ON - OFF' as in the past. This has great effects, such as being able to extend the lifespan of contacts, etc. without having to repeat the process over and over again.

[Brief explanation of drawings]

Figures 1 and 2 are diagrams showing a conventional example. Figure 1 is a schematic diagram of the dehumidifier installed in a closed switchboard, and Figure 2 is a characteristic diagram showing changes in relative humidity over time. , FIG. 3 and FIG. 4 are diagrams showing an embodiment of the present invention,
FIG. 3 is a schematic configuration diagram of a dehumidifying device installed in a closed switchboard, and FIG. 4 is a characteristic diagram showing changes in relative humidity over time. J OJ... Closed type switchboard, 101A... Outside air intake port of closed type switchboard, 102... Dehumidifier, 103...
- Humidity detector with contact, 104... Space heater. Applicant's representative Patent attorney Takehiko Suzue Figure 1 Figure 2

Claims (1)

[Claims] When the humidity detector installed near the outside air inlet in the closed type power distribution board and the humidity detector installed in the closed type power distribution board detect a preset high humidity, heat generation starts, and the humidity detector A dehumidifying device for a closed power distribution board, characterized by comprising a heater that stops generating heat when a preset low humidity is detected.