Condensation suppression structure and method

Abstract

To suppress dew condensation in a high voltage device or its peripheral structure mounted in an aircraft and to simplify the structure.SOLUTION: An electric panel (10) mounted in an aircraft comprises: an air chamber (11) that stores dry air of normal pressure; an air chamber valve (15) that seals the air chamber in a closed state and can fill the inside with the dry air of the normal pressure from outside the air chamber in an open state; a nozzle (20) that sprays the dry air in the air chamber to a high voltage device (M) or a conductor (M1); an adjust valve (22) that adjusts the dry air supplied from the air chamber to the nozzle. The adjust valve is opened under low pressure of the sky, the dry air of the normal pressure is sprayed to the high voltage device or the conductor by a pressure difference between inside and outside the air chamber, and dew condensation is suppressed.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a condensation suppression structure and a condensation suppression method for preventing condensation on high-voltage equipment and its surrounding structures. [Background technology]

[0002] High-voltage equipment such as circuit breakers are used while installed in an electrical panel. Here, electrical panels have a known structure for preventing condensation, which can cause breakdowns and other problems, on the installed equipment and components. An example of such a structure is disclosed in Patent Document 1. In Patent Document 1, dry air is blown from a nozzle onto the electronic components inside the panel to dehumidify and cool them. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-93730 Summary of the Invention [Problem to be solved by the invention]

[0004] The device disclosed in Patent Document 1 is equipped with a heat exchanger and a fan for generating dry air, and also requires a fan for blowing the dry air. As a result, the device has the problem that the installation of the heat exchanger and fan complicates the structure of the entire device, increasing manufacturing costs.

[0005] Incidentally, high-voltage equipment is also used in aircraft to operate engines and various electrical equipment. In particular, when used on aircraft, the equipment is repeatedly exposed to both ground and air environments in a short period of time, which makes condensation more likely to occur than in the electrical panels mentioned above, and therefore preventing condensation is of even greater importance. Furthermore, in aircraft, it is increasingly important to keep the overall structure of the equipment simple from the perspective of simplifying the aircraft configuration and maintaining it.

[0006] The present invention has been made in consideration of these points, and one of its objects is to provide a condensation suppression structure and a condensation suppression method that can suppress the occurrence of condensation on high-voltage equipment and its surrounding structures installed on aircraft, and that can simplify the structure. [Means for solving the problem]

[0007] One embodiment of the condensation suppression structure of the present invention is a condensation suppression structure that suppresses condensation on high-voltage equipment and / or its surrounding structures installed on an aircraft, and is characterized in that it comprises an air chamber that stores dry air at normal pressure inside, an air chamber valve that seals the air chamber in a closed state and is capable of filling the air chamber with dry air at normal pressure from the outside to the inside when it is open, a nozzle that sprays the dry air inside the air chamber onto the high-voltage equipment and / or its surrounding structures, and an adjustment valve that adjusts the dry air supplied from the air chamber to the nozzle, and is characterized in that the adjustment valve is opened under low pressure in the atmosphere, and the pressure difference between the inside and outside of the air chamber causes the dry air at normal pressure inside the air chamber to be sprayed onto the high-voltage equipment and / or its surrounding structures.

[0008] One embodiment of the condensation suppression method of the present invention is a condensation suppression method for suppressing condensation on high-voltage equipment and / or its surrounding structures installed on an aircraft, characterized in that before or immediately after the aircraft takes flight, dry air at normal pressure is filled and stored inside an air chamber, and when the aircraft is flying in the air where the pressure is low, the dry air at normal pressure inside the air chamber is blown onto the high-voltage equipment and / or its surrounding structures due to the pressure difference between the air chamber and the outside. [Effects of the Invention]

[0009] According to the present invention, by taking advantage of the fact that aircraft operate in an environment where pressure changes, dry air can be blown from a nozzle by utilizing the pressure difference between the air chamber and the outside. This makes it possible to omit a mechanism for generating dry air and a fan for blowing dry air, thereby simplifying the structure and reducing manufacturing costs. Furthermore, while high humidity in the air makes condensation more likely to occur during aircraft operation, the occurrence of such condensation can be effectively suppressed by blowing dry air filled on the ground, etc., and the simplified structure also provides benefits such as reducing the burden of maintenance work on the aircraft. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a configuration diagram schematically illustrating a condensation suppression structure according to an embodiment. [Figure 2] 1 is a block diagram showing the configuration of an electrical panel according to an embodiment; [Figure 3] FIG. 2 is a functional block diagram of a control unit according to the embodiment. [Figure 4] FIG. 10 is a diagram illustrating a configuration of a dew condensation suppression structure according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0011] A condensation suppression structure according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings. Note that the present invention is not limited to the following embodiment, and can be implemented by appropriate modifications within the scope of the present invention. For the sake of convenience, some components may be omitted in the following drawings.

[0012] FIG. 1 is a schematic diagram illustrating a condensation suppression structure according to an embodiment. As shown in FIG. 1, the condensation suppression structure is composed of an electrical panel 10, and high-voltage equipment M is housed in the electrical panel 10. Examples of the high-voltage equipment M include equipment with a rated voltage of 3 kV or more, such as a circuit breaker, a switchgear, a disconnecting switch, a transformer, an inverter, and a converter. At least one conductor M1 (two in this embodiment) is connected to the high-voltage equipment M, and the conductor M1 is arranged so that electricity can flow through the high-voltage equipment M. The conductor M1 forms a peripheral structure of the high-voltage equipment M, and such peripheral structure includes a structure to which a high voltage similar to that of the high-voltage equipment M is applied, and in addition to the conductor M1, a connector or the like can be used as an example.

[0013] The electrical panel 10 is mounted on board an aircraft (not shown). The aircraft is not particularly limited as long as it can fly from the ground into the sky, and examples include airplanes of various sizes, such as large and small airplanes, as well as helicopters.

[0014] The electrical panel 10 includes an air chamber 11 that stores dry air therein, and an accommodation chamber 12 that accommodates high-voltage equipment M therein. In this embodiment, the air chamber 11 is provided above the accommodation chamber 12, and a partition wall 13 is provided between them. Here, the humidity of the dry air is set to be lower than the humidity of a high-humidity environment caused by clouds or fog in the sky, and is set to the humidity of the outside air on a sunny or cloudy day on the ground, for example, when it is raining (snowing), or when it is not.

[0015] An air chamber valve 15 is provided in the air chamber 11. The air chamber valve 15 may be provided in an opening in a wall that forms the air chamber 11, or may be provided in a pipe or the like that communicates with the inside of the air chamber 11.

[0016] When the air chamber valve 15 is closed, the air chamber 11 remains sealed. When the air chamber valve 15 is open, the air chamber 11 is unsealed, and the inside and outside of the air chamber 11 are in communication through the air chamber valve 15. Therefore, when the air chamber valve 15 is opened in a normal pressure (atmospheric pressure) environment on the ground, when the air chamber 11 is at a pressure lower than normal pressure, dry air at normal pressure can be filled from the outside to the inside of the air chamber 11. After this filling, the air chamber valve 15 is closed, and normal pressure dry air is stored inside the air chamber 11. Note that the air chamber 11 can be filled with dry air using a blower or the like on the ground.

[0017] The accommodation chamber 12 is a semi-sealed space that maintains a predetermined level of airtightness without being completely sealed. Therefore, when there is a pressure change outside the electrical panel 10, the pressure inside the accommodation chamber 12 also changes in response to that pressure change or with a slight time lag relative to that pressure change. An exhaust port 17 is provided in the accommodation chamber 12, and air inside the accommodation chamber 12 is exhausted to the outside through the exhaust port 17. The exhaust port 17 may be provided in an opening in a wall that forms the accommodation chamber 12, or may be provided in a pipe or the like that communicates with the inside of the accommodation chamber 12. The exhaust port 17 is equipped with a check valve that allows exhaust from inside the accommodation chamber 12 through the exhaust port 17 while blocking air from being drawn into the inside of the accommodation chamber 12 from the outside.

[0018] The electrical panel 10 further includes a nozzle 20 provided inside the storage chamber 12 and an adjusting valve 22 provided in a flow path 21 that connects the storage chamber 12 and the air chamber 11 .

[0019] The nozzle 20 is provided so as to be able to blow dry air at normal pressure from the air chamber 11 onto the high-voltage equipment M and the conductor M1. Although a detailed description of the nozzle 20 will be omitted, the nozzle 20 is capable of adjusting the blowing position and direction, and the blowing position is not limited to a single position but may be multiple positions. Thus, the nozzle 20 may blow dry air onto both the high-voltage equipment M and the conductor M1, or onto either one of them, and the blowing position is adjusted as appropriate.

[0020] The adjusting valve 22 opens and closes the flow path 21 to switch between supplying and blocking dry air to the nozzle 20, and also adjusts the amount of dry air supplied to the nozzle 20 by changing the opening degree. In this embodiment, the adjusting valve 22 is configured by an electromagnetic valve.

[0021] The electrical panel 10 further includes a surface resistance measuring unit 24 and a control unit 31 that controls each part of the electrical panel 10 including the air chamber valve 15, the adjustment valve 22, and the surface resistance measuring unit 24.

[0022] The surface resistance measuring unit 24 uses a surface resistance meter that measures the surface resistance of the conductor M1, and outputs the measurement results to the control unit 31. Here, the surface resistance measuring unit 24 is configured as a detection unit that detects the moisture absorption state of the conductor M1.

[0023] Fig. 2 is a block diagram showing the configuration of the electrical panel 10 according to the embodiment. As shown in Fig. 2, in addition to the configuration described above, the electrical panel 10 is equipped with a control unit 31, a storage unit 32, and an input unit 33. Examples of devices having the control unit 31, the storage unit 32, and the input unit 33 include a programmable logic controller (PLC) and a personal computer (PC).

[0024] The control unit 31 is made up of a central processing unit (CPU) and the like, and controls the entire electrical panel 10 by controlling each part of the electrical panel 10. The control unit 31 has functions such as performing various calculation processes on information input from the memory unit 32 and the input unit 33 in accordance with a program stored in the memory unit 32, and controlling the opening and closing of the air chamber valve 15 and the adjustment valve 22.

[0025] The storage unit 32 includes a RAM (Random Access Memory), a ROM (Read Only Memory), etc. The RAM is used as a working area for the control unit 31, and stores information output from the input unit 33 via the control unit 31. The ROM stores programs for the control unit 31 to perform various calculations and controls, programs for functioning as applications, data, etc.

[0026] The input unit 33 acquires measurement results, data, command signals, etc. output from the surface resistance measuring unit 24, the altimeter A equipped on the aircraft, and various sensors (including various sensors on the aircraft) not shown, and outputs them to the control unit 31. The input unit 33 acquires measurement results, data, command signals, etc. via wired or wireless communication as a communication interface.

[0027] Next, the configuration of the control unit 31 will be described with reference to Fig. 3. Fig. 3 shows the control unit 31 as a functional block diagram. The control unit 31 functions as a filling control unit 31a and a spraying control unit 31b. These functional blocks are realized by the control unit 31 executing a program stored in the storage unit 32. Note that the functional blocks of the control unit 31 shown in Fig. 3 only show configurations related to the present invention, and other configurations are omitted.

[0028] The filling control unit 31a controls the opening and closing of the air chamber valve 15. An example of this control is controlling the timing of opening and closing the air chamber valve 15 based on the measurement results output from the altimeter A. This allows the air chamber valve 15 to be in an open state when the aircraft is deployed on the ground before flight or immediately after flight, and to be switched to a closed state when the aircraft reaches a predetermined altitude.

[0029] The spray control unit 31b calculates the optimal supply flow rate of dry air to be sprayed from the nozzle 20 based on the measurement results output from the surface resistance measurement unit 24. An example of the calculation is to store in advance in the storage unit 32 a program or a relational expression that determines an appropriate amount of dry air to be sprayed to suppress condensation based on the surface resistance value of the surface resistance measurement unit 24, and perform the calculation based on such a program or expression. Another example of the calculation is to control the opening and closing of the adjustment valve 22 based on flight conditions such as the aircraft's flight altitude (measurement results of the altimeter A). The spray control unit 31b calculates the opening degree of the adjustment valve 22 based on the results of the calculation, and outputs an electrical signal to the adjustment valve 22 according to the opening degree determined by the calculation to control the opening and closing (opening degree) of the adjustment valve 22.

[0030] Next, an example of a method for preventing condensation in the electrical panel 10 according to the above embodiment will be described. Here, a method for preventing condensation when an aircraft that repeatedly takes off and lands flies from a state where it has landed on the ground to a state where it is flying in the sky will be described.

[0031] First, before or immediately after the aircraft takes flight, a storage step is performed in which dry air at normal pressure is stored in the air chamber 11. In the storage step, the air chamber valve 15 is opened under the control of the filling control unit 31a.

[0032] By opening the air chamber valve 15, the air chamber 11 is unsealed, and the inside and outside of the air chamber 11 are connected through the air chamber valve 15. As a result, since the pressure inside the air chamber 11 was lower than normal pressure during the previous flight as described below, dry air under normal pressure (atmospheric pressure) on the ground is filled into the air chamber 11 through the air chamber valve 15. After the pressure inside the air chamber 11 has reached normal pressure or a pressure close to normal pressure through this filling, the air chamber valve 15 is closed, and dry air at normal pressure is stored inside the air chamber 11.

[0033] After the storage step is performed and while the aircraft is in flight (flight), a measurement step is performed. In the measurement step, the surface resistance of the conductor M1 is measured by the surface resistance measurement unit 24, and the measurement result is output to the control unit 31. The lower the surface resistance value of the conductor M1, the greater the amount of moisture absorption of the conductor M1, so the moisture absorption state of the conductor M1 is detected by the measurement by the surface resistance measurement unit 24.

[0034] In the measurement step, in order to suppress the occurrence of condensation on the conductor M1, the spray control unit 31b determines whether or not dry air needs to be blown from the nozzle 20 based on the measurement results of the surface resistance measurement unit 24. Furthermore, if blowing of dry air is required, the spray control unit 31b calculates an appropriate amount of blowing air to suppress the occurrence of condensation on the conductor M1 in accordance with the measurement results of the surface resistance measurement unit 24. Note that an example of a situation in which blowing of dry air is required is when the flight altitude is high and the air pressure is low, and the environment is high humidity due to clouds or fog in the sky.

[0035] If the measurement step requires the blowing of dry air, the blowing step is carried out. In the blowing step, while the aircraft is in flight (flight), the blowing control unit 31b calculates the aperture of the adjustment valve 22 according to the amount of dry air to be blown calculated in the measurement step, and controls the opening and closing (aperture) of the adjustment valve 22 according to the result of this calculation. As a result, the adjustment valve 22 is opened according to the controlled aperture, and dry air flows into the nozzle 20 through the adjustment valve 22 due to the pressure difference between the inside of the air chamber 11 and the storage chamber 12 outside the air chamber 11.

[0036] Dry air at normal pressure inside the air chamber 11 is blown from the nozzle 20 toward the high-voltage equipment M and the conductor M1, and the amount of dry air blown is adjusted according to the opening of the adjustment valve 22. By blowing dry air, a dry state can be maintained, preventing condensation on the high-voltage equipment M and moisture absorption by the conductor M1. This makes it possible to eliminate breakdowns caused by condensation, and by reducing the breakdown voltage of the conductor M1, it is possible to avoid the occurrence of discharge and maintain good insulation durability.

[0037] In response to the spraying of dry air from nozzle 20, the air in storage chamber 12 is appropriately exhausted from exhaust port 17. In addition, as dry air in air chamber 11 is supplied from nozzle 20 to storage chamber 12, the pressure inside air chamber 11 decreases, and by closing adjustment valve 22 above, air chamber 11 is maintained at a pressure lower than normal pressure.

[0038] Here, the measurement by the surface resistance measuring unit 24 in the measuring step is performed continuously or intermittently while the aircraft is in flight. The blowing of dry air in the blowing step may be performed continuously or may be switched between blowing and stopping as appropriate depending on the measurement results of the measuring step.

[0039] Furthermore, if the capacity of the air chamber 11 is found to be sufficient in the measurement step, the measurement by the surface resistance measuring unit 24 may be omitted, and the adjusting valve 22 may be controlled to switch between blowing dry air and stopping the blowing depending on the takeoff and landing of the aircraft. Examples of such control include opening the adjusting valve 22 during takeoff and closing the adjusting valve 22 during landing, or comparing the altitude measured by the altimeter A with a predetermined threshold value to switch between opening and closing the adjusting valve 22.

[0040] As described above, in the above embodiment, in an environment of normal pressure (atmospheric pressure) when the aircraft is deployed on the ground, dry air can be sealed and stored in air chamber 11 via air chamber valve 15. Furthermore, by opening adjustment valve 22 when the aircraft is flying in the air, dry air can be sprayed from nozzle 20 due to the pressure difference between air chamber 11, the inside of which is at atmospheric pressure, and storage chamber 12, the pressure of which is low in a high-altitude environment.

[0041] In this way, in this embodiment, dry air is blown by effectively utilizing the fact that aircraft are operated in an environment where pressure changes. This makes it possible to omit the conventional mechanisms for generating dry air and fans for blowing dry air, thereby simplifying the structure of the electrical panel 10. As a result, not only can the number of assembly steps and parts be reduced, thereby reducing manufacturing costs, but also shortening the work time and reducing the burden of aircraft maintenance, etc.

[0042] Furthermore, while the humidity in the air becomes high during aircraft operation, condensation is likely to occur, but this condensation can be effectively suppressed by blowing dry air filled on the ground, etc. Therefore, this embodiment can simplify the structure while suppressing condensation on the high-voltage equipment M and its surroundings during aircraft flight.

[0043] In the above embodiment, the adjustment valve 22 is controlled according to the measurement results of the surface resistance measurement unit 24, making it possible to adjust the timing and amount of dry air blown. By blowing dry air in this manner, even during flight in a high-humidity environment, the high-voltage equipment M and conductor M1 can be kept dry, preventing condensation and moisture absorption by the conductor M1. This reduces the breakdown voltage, preventing discharge and maintaining good insulation durability. Furthermore, if the surface resistance measured by the surface resistance measurement unit 24 is high, it is assumed that condensation will not occur, and the blowing of dry air can be stopped or the amount of blown air can be reduced, thereby reducing unnecessary consumption of dry air.

[0044] Here, we compared the discharge voltages of sample a, which was placed in a high-humidity environment without changing the moisture absorption state, and sample b, which was placed in a low-humidity environment with increased moisture absorption, using a reference sample (hereinafter referred to as the "reference sample") corresponding to conductor M1. We confirmed that sample b had a lower discharge voltage than sample a, not only in an atmospheric pressure environment but also in a rapid decompression environment corresponding to high altitude, and that its insulation durability was reduced. Therefore, in controlling the blowing of dry air, controlling it according to the surface resistance value at which the sample becomes hygroscopic, as in the above-described embodiment, can more easily detect the insulation performance itself, improve responsiveness, and better prevent discharge occurrence, compared to controlling it according to humidity.

[0045] The present invention is not limited to the above-described embodiment, and various modifications can be made to the embodiment. In the above-described embodiment, the size, shape, orientation, etc. shown in the accompanying drawings are not limited to these, and can be modified as appropriate within the scope of the effects of the present invention. In addition, the present invention can be modified as appropriate without departing from the scope of the object of the present invention.

[0046] In the above embodiment, the measurement results of the surface resistance measurement unit 24 are used to control the adjustment valve 22. However, a humidity measurement unit may be used instead of or together with the surface resistance measurement unit 24. Such a humidity measurement unit may be configured to include a hygrometer or the like that measures the humidity in the housing chamber 12, which is the space surrounding the high-voltage equipment M, and the control unit 31 may control the opening and closing of the adjustment valve 22 to adjust the amount of dry air blown based on the measurement results of the humidity measurement unit. In such a configuration, for example, when the humidity in the housing chamber 12 reaches or exceeds a predetermined threshold, dry air is blown to suppress condensation on the high-voltage equipment M, etc. The humidity measurement unit may be provided separately from the surface resistance measurement unit 24, or may be integrated with the surface resistance measurement unit 24 by using a surface resistance meter that also functions as a hygrometer.

[0047] Fig. 4 is a schematic diagram showing a condensation suppression structure according to a modified example. As shown in Fig. 4, the electrical panel 10 may be configured to have an auxiliary air chamber 41 and a nitrogen supply unit 42 added to the configuration of the above embodiment.

[0048] The auxiliary air chamber 41 is in communication with the air chamber 11 and is filled with dry air at a pressure higher than normal. By providing a valve (not shown) in the flow path that connects the auxiliary air chamber 41 and the air chamber 11, it is possible to switch between supplying and stopping the supply of dry air to the air chamber 11 via the valve. This makes it possible to increase the amount of dry air blown from the nozzle 20 and better suppress the occurrence of condensation.

[0049] The nitrogen supply unit 42 is configured by a nitrogen cylinder or the like, and combines nitrogen with the dry air supplied from the air chamber 11 to the nozzle 20. The nitrogen supply unit 42 is connected to the flow path 21 via a valve (not shown), and the valve can switch between supplying and stopping the supply of nitrogen to the dry air flowing from the air chamber 11 to the nozzle 20. This also makes it possible to increase the amount of dry air blown from the nozzle 20, and to better suppress the occurrence of condensation.

[0050] Furthermore, the exhaust port 17 may be provided with an appropriate valve instead of a check valve, and the valve may be opened and closed to allow exhaust from the accommodation chamber 12 while blocking intake of air at the exhaust port 17 .

[0051] In addition, although the case where an altimeter A equipped on the aircraft is used to obtain the altitude of the aircraft has been described, this is not limited to this and can be modified as appropriate, such as installing an altimeter on the electrical panel 10 to obtain measurement results.

[0052] Furthermore, the condensation suppression structure of the present invention may be configured to be provided in devices or structures other than the electrical panel 10 in the aircraft fuselage. [Explanation of symbols]

[0053] 10: Electrical panel 11: Air chamber 15: Air chamber valve 20: Nozzle 22: Adjusting valve 24:Surface resistance measurement section 31: Control unit 41: Auxiliary air chamber 42: Nitrogen supply unit M: High voltage equipment M1: Conductor (peripheral structure)

Claims

1. A condensation suppression structure for suppressing condensation on high-voltage equipment and / or its surrounding structure installed on an aircraft, an air chamber that stores dry air at normal pressure inside; an air chamber valve that seals the air chamber in a closed state and that can fill the air chamber with dry air at normal pressure from the outside to the inside in an open state; a nozzle that sprays the dry air inside the air chamber onto the high-voltage equipment and / or its peripheral structure; and an adjustment valve that adjusts the dry air supplied from the air chamber to the nozzle, A condensation prevention structure characterized in that the adjustment valve is opened under low atmospheric pressure, and the pressure difference between the air chamber and the outside causes dry air at normal pressure inside the air chamber to be blown onto the high-voltage equipment and / or its surrounding structure.

2. The condensation suppression structure according to claim 1, further comprising a control unit having a function of controlling opening and closing of the adjustment valve.

3. the peripheral structure of the high-voltage equipment has a conductor that is energized by the high-voltage equipment; a surface resistance measuring unit for measuring the surface resistance of the conductor; The condensation suppression structure according to claim 2 , wherein the control unit controls opening and closing of the adjustment valve based on the measurement result of the surface resistance measurement unit.

4. a humidity measuring unit for measuring humidity in a space surrounding the high-voltage equipment; 4. The condensation suppression structure according to claim 2, wherein the control unit controls opening and closing of the adjustment valve based on the measurement result of the humidity measurement unit.

5. 5. The condensation suppression structure according to claim 2, wherein the control unit controls opening and closing of the adjusting valve based on a flight state of the aircraft.

6. an auxiliary air chamber communicating with the air chamber; 6. The condensation suppression structure according to claim 1, wherein the auxiliary air chamber is filled with dry air at a pressure higher than normal pressure.

7. 7. The condensation suppression structure according to claim 1, further comprising a nitrogen supply unit that mixes nitrogen with the dry air supplied to the nozzle.

8. A condensation suppression method for suppressing condensation on high-voltage equipment and / or its surrounding structure installed on an aircraft, comprising: Before or immediately after the flight of the aircraft, dry air at normal pressure is filled and stored inside the air chamber; A condensation suppression method characterized by blowing dry air at normal pressure inside the air chamber onto the high-voltage equipment and / or its surrounding structure by using the pressure difference between the air chamber and the outside when the aircraft is flying in the air under low pressure.

9. the peripheral structure of the high-voltage equipment has a conductor that is energized by the high-voltage equipment; 9. The method for suppressing condensation according to claim 8, wherein the surface resistance of the conductor is measured during the flight, and the amount of dry air blown is adjusted based on the measurement result.

10. 10. The method for suppressing condensation according to claim 8, further comprising measuring humidity in the space surrounding the high-voltage equipment during the flight, and adjusting the amount of dry air blown based on the measurement result.

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