JP5270437B2 - Power distribution facility testing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a test method for investigating the effect of steam entering the envelope of distribution equipment in other form than raindrops or immersion, and of dew arising inside the envelope by the steam. <P>SOLUTION: A plurality of hygrometers are installed inside a closed metal panel 5, and a humidifier for raising the humidity within the closed metal panel 5 is installed to raise the humidity. After passage of a specified time, humidities at plural points of the closed metal panel 5 are measured to check the existence of dew within the closed metal panel 5. When dew is condensed, the position of dew condensation and the state of dew are checked. Based on this information, the humidity within the closed metal panel 5, the state (the level of dew condensation) of dew at that humidity, and the effect of the humidity and the state of dew upon the parts are investigated. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a test method for a power distribution facility for investigating the water vapor that enters the enclosure of the power distribution facility in a form other than raindrops or flooding, and the influence of dew condensation caused by the water vapor.

  A distribution facility for supplying electric energy to a building such as a factory usually has a configuration in which a plurality of electric devices and parts are housed in a box-shaped envelope (closed metal panel). It is known that power distribution equipment placed in a high humidity environment (for example, relative humidity of 70% RH or more) promotes deterioration, wear, and rusting of equipment and parts inside the envelope, and induces malfunction. Yes. Further, in a power distribution facility that handles high voltage, a slight discharge occurs due to slight moisture. The micro discharge generates nitric acid that absorbs moisture and causes the device to become fouled. This fouling causes a finer discharge and causes tracking, which is a kind of leakage phenomenon. Further, due to the influence of moisture and electric field, a migration phenomenon occurs in which the metal used for the conductor is melted, and the insulation resistance is lowered. If such a state is left as it is, a short circuit or a ground fault may eventually occur.

  As data on humidity, the amount of water vapor contained in the air and the decrease in insulation resistance, if the equipment inside the envelope of the distribution facility has not deteriorated over time, the relative humidity is about 85% RH, dust, salt damage, and nitric acid adhesion In the case where surface contamination such as the above has progressed, there is a phenomenon in which the insulation resistance rapidly decreases at a relative humidity of about 70% RH. Relative humidity 85% RH is a value of about the average maximum humidity in the rainy season in Japan, and humidity 70% RH is a value of the annual average humidity of Japan.

  In this way, the ingress of water droplets in distribution facilities can cause short circuits and ground faults, so tests on water droplets that invade directly from the outside, such as raindrops and inundation, have already been established and implemented (non-patented) Reference 1). For example, a distribution device such as a switchgear installed outdoors is exposed to a water flow for 5 minutes using a nozzle capable of spraying a water flow of 460 kPa, 5 mm / min at an angle of 60 to 80 degrees from the outside. There are tests to investigate the presence or absence of water droplets on the insulation and electrical equipment of the main circuit and auxiliary circuit installed inside. The short circuit and ground fault caused by water droplets entering directly from the outside, such as raindrops and inundation assumed here, were issued in March 2007 by the Japan Electrical Manufacturers' Association. "Is it?" Is currently reported to be about 10% of the causes of short circuits and ground faults in distribution facilities.

  On the other hand, since the envelope of the power distribution equipment has openings such as ventilation openings and cable leads on the floor side, these openings are installed when installed in places such as underground or under the floor where water accumulates. High-humidity air that contains a lot of water vapor enters. In addition, even in equipment installed indoors, high-humidity air may enter from a bus duct or the like connected to external equipment. For this reason, even in facilities installed in locations that are not directly exposed to raindrops, there are many cases in which high humidity air that has entered enters a cold metal part to condense and form water droplets inside the envelope. . Such a test for investigating the influence of water vapor entering the envelope in a form other than raindrops or water immersion and the dew condensation caused by the water vapor has not been conducted.

IEC 60529 “Degrees of protection provided by enclosures (IP Code)” Japan Standards Association

  As described above, conventionally, the effects of water vapor that enters the enclosure of the distribution facility in a form other than raindrops or flooding, and the dew condensation that occurs inside the envelope due to the water vapor, affect the equipment and components inside the envelope. As a method for investigating the above has not been established, it was insufficient as a test for investigating the effects of moisture on distribution facilities.

  The present invention has been made in order to solve the above-described problems, and water vapor that enters the enclosure of the power distribution facility in a form other than raindrops or inundation, and dew condensation that occurs inside the envelope due to the water vapor. The purpose of this study is to improve the quality of distribution facilities by providing a test method for investigating the effects of water, suppressing deterioration of distribution equipment and components due to humidity environment and condensation.

The distribution facility testing method according to the present invention is a distribution facility in which a plurality of devices and parts constituting a distribution means are housed in a box-shaped envelope, and the water vapor entering the inside of the envelope and the water vapor A distribution equipment testing method for investigating the influence of dew condensation caused by the first step of installing humidity measuring means inside the envelope, a second step of increasing the humidity inside the envelope, After a predetermined time has elapsed from step 2, a third step of measuring the humidity inside the envelope by the humidity measuring means, and checking the inside of the envelope and, if condensation has occurred, a position where condensation has occurred Based on the information obtained in the fourth step for confirming the state of dew condensation, the third step and the fourth step, the fifth is to examine the humidity inside the envelope and the dew condensation state at that humidity. step only free and you to the fourth step Condensation can be confirmed by checking the inner wall of the envelope, near the opening of the envelope, around the cooling device housed in the envelope, around the ventilator housed in the envelope, or Insulator surface .

  According to the present invention, the humidity inside the envelope of the power distribution equipment is increased to investigate the humidity inside the envelope and the state of condensation in the humidity. Based on these investigation results, It is possible to estimate the water vapor entering the envelope and the effect of dew condensation caused by the water vapor, suppressing the deterioration of the equipment and parts of the power distribution equipment due to the humidity environment and condensation, and improving the quality of the power distribution equipment Can be planned.

It is a figure which shows the example of the power distribution equipment for demonstrating the test method of the power distribution equipment which concerns on Embodiment 1 of this invention. It is a figure which shows the example which used the humidifier as a humidification means in the test method of the power distribution equipment which concerns on Embodiment 1 of this invention. It is a figure which shows the example of the test result by the test method of the power distribution equipment which concerns on Embodiment 1 of this invention. It is a figure which shows the example of the power distribution equipment for demonstrating the test method of the power distribution equipment which concerns on Embodiment 3 of this invention. It is a figure which shows the example of the power distribution equipment for demonstrating the test method of the power distribution equipment which concerns on Embodiment 4 of this invention. It is a figure which shows the example of the power distribution equipment for demonstrating the test method of the power distribution equipment which concerns on Embodiment 5 of this invention. It is a figure which shows the example of the power distribution equipment for a test for demonstrating the test method of the power distribution equipment which concerns on Embodiment 6 of this invention.

  The present invention relates to power distribution equipment that supplies electrical energy to buildings such as factories, water vapor that enters the enclosure of the power distribution equipment in a form other than raindrops or water inundation, and the influence of dew condensation that occurs inside the envelope due to the water vapor It provides a test method to investigate. Hereinafter, Embodiments 1 to 6 which are modes for carrying out the present invention will be described with reference to the drawings.

Embodiment 1 FIG.
FIG. 1 is a diagram illustrating an example of a power distribution facility for explaining a test method for the power distribution facility according to Embodiment 1 of the present invention. The power distribution facility 1 covers a plurality of devices and parts constituting the power distribution means, for example, electric devices such as a circuit breaker 2 and a transformer (not shown), a conductor 3 such as a cable connecting those circuits, and a conductor. An insulator 4 and the like are provided, and these devices and parts are housed in a closed metal plate 5 that is a box-type envelope. The closed metal board 5 can be opened and closed by an opening / closing door 5a, and has a cable through hole 5b on the back of the floor surface.

  On the floor surface inside the closed metal board 5, open containers 6 as humidifying means for increasing the humidity inside the closed metal board 5 are installed at two locations near the open / close door 5a and the cable through hole 5b. The open container 6 is a container in which an upper part is opened and a member containing water or moisture, specifically, absorbent cotton, cloth, sponge or the like is put therein.

  A plurality of hygrometers that are humidity measuring means are installed inside the closed metal panel 5. In FIG. 1, 7a-7g has shown the installation position of the hygrometer. As the humidity measuring means, various types of hygrometers such as an electric hygrometer and an infrared absorption hygrometer can be used in addition to a moisture meter and a dew point meter. The type (model) must be the same. Further, temperature measuring means (not shown) is installed inside and outside the closed metal plate 5.

  Next, a test method for the distribution facility in the first embodiment will be described. This test reproduces the situation where the inside of the closed metal panel 5 is placed in a high humidity environment for the power distribution facility 1 in which a plurality of devices and parts are housed in the box-shaped closed metal panel 5, except for raindrops and flooded water. This test is performed for the purpose of investigating the water vapor entering the inside of the closed metal disk 5 and the influence of dew condensation caused by the water vapor. The test method includes the following five steps.

  First, as a first step, a plurality of hygrometers are installed inside the closed metal board 5. The installation position of the hygrometer is in the vicinity of the open / close door 5a (7a, 7b) of the closed metal panel 5 considered to be easily affected by the outside air, in the vicinity of the inner wall (7c) of the closed metal panel 5, and in the cable through hole 5b through which the outside air enters. The vicinity (7d), the vicinity of the insulator 4 (7e) where deterioration due to condensation tends to proceed, the vicinity of the circuit breaker 2 (7f, 7g), which is an important device, and the like.

  In addition, the saturated vapor pressure of water vapor increases as the temperature inside the closed metal panel 5 increases. However, when the temperature difference between the inside and the outside of the closed metal panel 5 is large, condensation is likely to occur in the portion cooled by the outside air. . For this reason, temperature measuring means are installed inside and outside the closed metal disk 5, and the temperatures inside and outside the closed metal disk 5 after the first step are measured and recorded.

  Next, as a second step, the humidity inside the closed metal plate 5 is increased. In the first embodiment, an open container 6 containing water or a member containing moisture, specifically, absorbent cotton, cloth, sponge or the like is used as a humidifying means for increasing the humidity inside the closed metal disk 5. The installation position of the open container 6 is set in the vicinity of the opening of the closed metal panel 5 where water vapor easily enters from the outside in order to reproduce the water vapor from the outside. For example, it is set near the gap of the open / close door 5a, near the cable through hole 5b, or near the ventilation window (not shown) or the bus duct (not shown). Further, when there is a recessed portion where water accumulates inside the closed metal disk 5, it is desirable to install it in the vicinity.

  However, in order to increase the structural strength of the equipment, for example, because the inside of the closed metal board 5 is narrow or the equipment and parts are installed without gaps, and the floor surface inside the closed metal board 5 is inclined. In the case where it cannot be stably installed in the above place due to a shape such as unevenness due to the presence of the frame, the open container 6 may be installed in a place other than the above. In that case, by changing the area of the open portion of the open container 6 and adjusting the amount of water to be evaporated, the humidity environment and the state of condensation when the open container 6 is installed at the original installation location are approached. Like that.

  In the first embodiment, the open container 6 containing water or a member containing water is used as the humidifying means. However, the humidifying means is not particularly limited, and the closed metal disk is formed by diffusing water vapor around it. 5 What is necessary is just to raise the humidity inside. For example, a humidifier 8 as shown in FIG. 2 or a humidity chamber (not shown) that can be installed inside the closed metal panel 5 may be used. Moreover, you may use combining any one or more of the open container 6, the humidifier 8, and the constant humidity tank which put the member containing water or water. By using a device such as a humidifier 8 or a humidity chamber, the humidity can be increased more easily and more quickly than when the open container 6 is used alone.

  After a predetermined time has elapsed from the second step, as a third step, the humidity at a plurality of locations of the closed metal disk 5 is measured with a hygrometer. The predetermined time is the time required for the measured value (average value) of the hygrometer installed in the closed metal panel 5 to reach a predetermined predetermined humidity (target humidity in this test). is there. Alternatively, one of the plurality of hygrometers is determined as a reference hygrometer, and the time required for the measurement value by the reference hygrometer to reach a predetermined humidity set in advance is set as the second hygrometer. It may be a predetermined time in the step.

  Next, in the fourth step, the inside of the closed metal plate 5, that is, the inner wall of the closed metal plate 5, and the dew condensation on the internal devices and parts are confirmed by a wetting sensor that detects the difference in the dielectric constant between water and air, etc. If condensation has occurred, check the position where condensation has occurred and the state of condensation. The state of condensation is determined based on the amount of water droplets due to condensation (size and number of water droplets). Further, as a means for detecting a slight amount of water, a sample that changes color due to water absorption may be used.

When the dew condensation inside the closed metal board 5 is confirmed, the following positions (a) to (f) are performed.
(A) The inner wall of the closed metal panel 5 that is easily affected by outside air.
(B) In the vicinity of an opening (a gap in the opening / closing door 5a, a cable through hole 5b, a ventilation window, a ventilation fan, a bus duct, etc.) of the closed metal panel 5 into which water vapor enters from outside.
(C) Places where condensation is likely to occur, such as cooling equipment and ventilators (both not shown).
(D) An insulator surface of an apparatus having an insulator to which a voltage load is applied.
(E) Machine parts and metal parts of equipment that may rust due to high humidity environment and condensation.
(F) Equipment in which performance degradation, accidents, and breakdowns may occur due to high humidity environments and condensation.

  Furthermore, in the fifth step, based on the information obtained in the third step and the fourth step, the humidity inside the closed metal panel 5 and the state of condensation (condensation level) at that humidity, and its humidity environment Investigate the effects of condensation on equipment and parts. Specifically, the presence or absence of dew condensation at each confirmation position and the state of dew condensation are investigated for the tested humidity and the time for which the humidity is maintained, and the effects on the equipment and parts existing at those positions are estimated. To do.

  In order to clarify the impact on equipment and components, it is necessary to confirm the presence or absence of rusting, insulation deterioration, equipment performance deterioration, and failure of each equipment and component. is there. A test for confirming the performance of a device can be performed in the same manner as a reliability test or the like normally performed on the device.

  FIG. 3 shows an example of a test result obtained by the distribution facility test method according to the first embodiment. In the example shown in FIG. 3, the measurement value in a hygrometer (not shown) determined as a reference point is maintained at a relative humidity of 70% RH and 80% RH for one hour, and six confirmation positions a to f (FIG. (Not shown), the relative humidity, the presence or absence of condensation, and the condensation level are investigated. Here, the dew condensation level is classified into four stages of 1 to 4, and the greater the number, the more dew condensation is progressing. From the test results shown in FIG. 3, it becomes clear that the inner wall of the closed metal panel 5 and the internal devices and parts are likely to be in a high humidity environment and are likely to cause condensation. Further, by performing the same test while changing the conditions such as humidity and time, the relationship between the humidity environment, time, and condensation level becomes clear in more detail.

  As described above, in the first embodiment, the humidity inside the closed metal panel 5 is increased with respect to the power distribution facility 1 in which a plurality of devices and parts constituting the power distribution means are housed in the box-shaped closed metal panel 5. By installing a humidifying means and providing a method of investigating the humidity inside the closed metal panel 5 and the state of condensation at that humidity, water vapor entering the inside of the closed metal panel 5 in a form other than raindrops or water immersion, and its It became possible to estimate the influence of condensation caused by water vapor. Based on the results of these surveys, measures against humidity environment and dew condensation are implemented to suppress the deterioration of the equipment and parts of power distribution facility 1 and prevent accidents caused by humidity environment and dew condensation. Can improve quality.

Embodiment 2. FIG.
In the first embodiment, in the second step, the humidifying means for increasing the humidity inside the closed metal disk 5 is installed inside the closed metal disk 5. In the distribution equipment testing method according to Embodiment 2 of the present invention, in the second step, the distribution equipment 1 is placed in an environment in which the humidity inside the closed metal board 5 is increased, whereby the inside of the closed metal board 5 of the distribution equipment 1 is set. Reproduces the situation in a high humidity environment. Since the first step and the third to fifth steps in the second embodiment are the same as those in the first embodiment, the description thereof is omitted.

In the second embodiment, in the second step, as an environment in which the humidity inside the closed metal panel 5 increases, for example, by installing the power distribution facility 1 in the following environments (a) to (c), Outside air is taken into the closed metal disk 5 to increase the humidity inside the closed metal disk 5.
(A) The power distribution facility 1 is installed outdoors, and the open / close door 5a of the closed metal panel 5 is opened.
(B) Open the window of the room where the closed metal plate 5 is installed.
(C) Use the air conditioning equipment of the room where the closed metal panel 5 is installed.

  In addition, when the humidity inside the closed metal panel 5 does not increase due to the above (a) to (c), the same humidification means as in the first embodiment, that is, the open container 6 containing water or a member containing water, humidification Any one or more of the vessel 8 and the humidity chamber may be installed inside the closed metal plate 5.

  According to the second embodiment, in addition to the same effects as those of the first embodiment, the high humidity environment and dew condensation caused by the actual weather, such as during and before and after rain, You can see if it will affect you.

Embodiment 3 FIG.
FIG. 4 is a diagram illustrating an example of a power distribution facility for explaining a test method for the power distribution facility in Embodiment 3 of the present invention. In FIG. 4, the same or corresponding parts as in FIG. In the third embodiment, in the first step of the distribution facility testing method according to the first embodiment or the second embodiment, heating means for raising the temperature inside the closed metal panel 5 inside the closed metal panel 5. The heater 9 is further installed.

  As described above, the saturated vapor pressure of water vapor increases as the temperature inside the closed metal disk 5 increases. For this reason, a space heater for preventing condensation may be installed inside the closed metal panel 5. Some devices and parts inside the closed metal board 5 generate Joule heat when current flows and dissipate heat to the surroundings. Therefore, in the third embodiment, the above situation is reproduced, and the influence of these heat sources on the humidity and the state of condensation in the closed metal panel 5 is investigated.

  In order to reproduce the situation where there is a heat source inside the closed metal board 5, in the first step, a heater 9 as a heating means is installed and used as a heat source. Moreover, when the apparatus and components which dissipate heat at the time of operation | movement are provided in the inside of the closed metal board 5, you may use this as a heat source. The second step to the fourth step are performed while operating these heat sources. Note that the second to fifth steps in the third embodiment are the same as those in the first embodiment, and a description thereof will be omitted.

  According to the third embodiment, it is possible to investigate the influence of the water vapor entering the inside of the closed metal board 5 and the dew condensation caused by the water vapor in the power distribution facility provided with the heat source inside the closed metal board 5. . Further, by comparing the test results according to the third embodiment with the test results of the first and second embodiments, the heat source inside the closed metal panel 5 is in a state of humidity and condensation inside the closed metal panel 5. How it will affect Furthermore, the effective arrangement | positioning for suppressing the influence of dew condensation about the apparatus and components of the power distribution equipment 1 including heat sources, such as a space heater, can be examined.

Embodiment 4 FIG.
FIG. 5 is a diagram showing an example of a power distribution facility for explaining a test method for the power distribution facility in the fourth embodiment of the present invention. In FIG. 5, the same or corresponding parts as in FIG.

  When the power distribution facility 1 includes a cooling means for lowering the temperature inside the closed metal panel 5 or a cooling means for lowering the temperature of the equipment and components, or a ventilation means for replacing the air inside the closed metal board 5. In such a case, the air around the cooling means and the ventilation means may be cooled to cause condensation.

  Therefore, in the fourth embodiment, in the distribution facility testing method according to the first embodiment or the second embodiment, the cooling means and the ventilation means of the distribution facility 1 are in a state of humidity and condensation in the closed metal panel 5. It is to investigate what kind of influence it has. In the example shown in FIG. 5, since the heat pipe 10 is provided as a cooling means for lowering the temperature inside the closed metal disk 5, the second to fourth steps are performed while the heat pipe 10 is operating.

  Moreover, when the power distribution equipment 1 is provided with a ventilation means (not shown) for replacing the air inside the closed metal board 5, the second to fourth steps are performed while the ventilation means is operating. Note that the second to fifth steps in the fourth embodiment are the same as those in the first embodiment, and a description thereof will be omitted.

  According to the fourth embodiment, it is possible to investigate the influence of the water vapor entering the inside of the closed metal panel 5 and the dew condensation caused by the water vapor in the power distribution facility provided with the cooling means and the ventilation means. Further, by comparing the test results according to the fourth embodiment with the test results of the first embodiment and the second embodiment, the cooling means and the ventilation means of the power distribution facility 1 are able to reduce the humidity and condensation inside the closed metal panel 5. It is possible to confirm how it affects the state of Furthermore, the effective arrangement | positioning for suppressing the influence of dew condensation about the apparatus and components of the power distribution equipment 1 including a cooling means and a ventilation means can be examined.

Embodiment 5 FIG.
FIG. 6 is a diagram illustrating an example of a power distribution facility for explaining a test method for the power distribution facility in the fifth embodiment of the present invention. In FIG. 6, the same or corresponding parts as those in FIGS. 1, 4, and 5 are denoted by the same reference numerals, and description thereof is omitted. The fifth embodiment is a combination of the third embodiment and the fourth embodiment, and the heat source, cooling means, and ventilation means of the power distribution facility 1 are different depending on the humidity and condensation in the closed metal panel 5. It is to investigate whether it affects.

  In the fifth embodiment, in the first step, a heater 9 which is a heating means is installed and used as a heat source. Moreover, in the example shown in FIG. 5, since the heat pipe 10 is provided as a cooling means for lowering the temperature inside the closed metal disk 5, the second step to the fourth step while the heater 9 and the heat pipe 10 are operated. Perform the steps. Further, when the power distribution facility is provided with ventilation means (not shown), the second to fourth steps are performed while the ventilation means is also operated. Since the second to fifth steps in the fifth embodiment are the same as those in the first embodiment, the description thereof is omitted.

  According to the fifth embodiment, it is possible to investigate the influence of the water vapor entering the inside of the closed metal panel 5 and the dew condensation caused by the water vapor in the power distribution facility provided with the heat source, the cooling means, and the ventilation means. . Further, by comparing the test results according to the fifth embodiment with the test results of the first to fourth embodiments, the heat source, the cooling means, and the ventilation means of the power distribution facility 1 have the humidity inside the closed metal panel 5. And how it affects the state of condensation. Furthermore, the effective arrangement | positioning for suppressing the influence of condensation can be examined about the apparatus and components of the power distribution equipment 1 including a heat source, a cooling means, and a ventilation means.

Embodiment 6 FIG.
In the said Embodiment 1-Embodiment 5, the moisture resistance test using a practical power distribution equipment may be difficult. For example, if you do not want to reduce the quality of internal equipment and components, or because the power distribution equipment to be tested is fixed by welding, installed in a sealed room, or heavy. This may be the case when it is not possible to move to a place where testing can be performed, or when there is no space inside the distribution facility and equipment and members necessary for testing cannot be installed.

  Therefore, in the sixth embodiment of the present invention, a test similar to the above first to fifth embodiments is performed using a test facility that simulates a practical power distribution facility. An example of the test facility in the sixth embodiment is shown in FIG. The test equipment 11 is provided with a humidifier 8a and a heater 9a inside a test metal board 12, and a heat pipe 10a for lowering the internal temperature. A plurality of hygrometers (not shown) are installed inside the test metal plate 12. Using such test equipment 11, a moisture resistance test including steps 1 to 5 similar to those in the first to fifth embodiments can be performed.

  According to the sixth embodiment, when the test using the practical power distribution equipment is difficult, the test equipment 11 simulating the practical power distribution equipment is used to determine the humidity inside the test metal board 12 and the humidity. It is possible to investigate the state of condensation and to estimate their effects on practical distribution facilities.

  The test method of the power distribution equipment according to the present invention can be used for a test for investigating the influence of water vapor entering the equipment in a form other than raindrops or water immersion and the dew condensation caused by the water vapor.

1 power distribution equipment, 2 circuit breakers, 3 conductors, 4 insulators,
5 Closed metal panel, 5a Open / close door, 5b Cable through hole, 6 Open container,
7a, 7b, 7c, 7d, 7e, 7f, 7g Installation position of hygrometer,
8, 8a humidifier, 9, 9a heater, 10, 10a heat pipe,
11 Test equipment, 12 Test metal panel.

Claims (13)

A distribution facility in which a plurality of devices and parts constituting the distribution means are housed in a box-shaped envelope, and the distribution facility for investigating the influence of water vapor entering the envelope and the dew condensation caused by the water vapor The test method of
A first step of installing a humidity measuring means inside the envelope;
A second step of increasing the humidity inside the envelope;
A third step of measuring the humidity inside the envelope by the humidity measuring means after a lapse of a predetermined time from the second step;
A fourth step of confirming the position where condensation has occurred and the state of condensation if condensation has occurred inside the envelope;
Based on the information obtained in the third step and the fourth step, seen including a fifth step of investigating the state of condensation in the enclosure interior humidity and its humidity,
In the fourth step, the dew condensation is confirmed in the inner wall of the envelope, in the vicinity of the opening of the envelope, in the vicinity of the cooling device accommodated in the envelope, or in the envelope. A test method for power distribution equipment, characterized in that it is in the vicinity of a ventilated device or the insulator surface of the equipment.   The power distribution facility testing method according to claim 1, wherein in the second step, humidification means for increasing humidity inside the envelope is installed inside the envelope. Equipment testing method.   It is a test method of the power distribution equipment of Claim 2, Comprising: As said humidification means, it uses combining any one or more of the open container, the humidifier, and the humidity chamber which put the member containing water or water. A test method for power distribution equipment.   The method for testing a distribution facility according to claim 1, wherein, in the second step, the distribution facility is placed in an environment in which the humidity inside the envelope increases. .   The method for testing a distribution facility according to claim 1, wherein in the first step, temperature measuring means is further installed inside and outside the envelope.   It is a test method of the power distribution equipment of Claim 1, Comprising: In the said 1st step, the heating means which raises the temperature inside the said envelope is further installed in the said envelope, The said heating means is set. A test method for a distribution facility, wherein the second step, the third step, and the fourth step are performed while operating.   2. The testing method for power distribution equipment according to claim 1, wherein when the power distribution equipment includes equipment and parts for dissipating heat to the surroundings during operation, the equipment to dissipate heat to the surroundings. And, the second step, the third step, and the fourth step are performed while operating the components, and the distribution facility testing method is characterized.   It is a test method of the power distribution equipment of Claim 1, Comprising: When the power distribution equipment is provided with the cooling means which lowers the temperature inside the envelope or the temperature of the equipment and parts, while operating the cooling means A method for testing a distribution facility, wherein the second step, the third step, and the fourth step are performed.   2. The test method for a power distribution facility according to claim 1, wherein when the power distribution facility includes a ventilation means for replacing the air inside the envelope, the second step, the second step while operating the ventilation means. 3. A method for testing a distribution facility, comprising performing step 3 and the fourth step.   It is the test method of the power distribution equipment of Claim 1, Comprising: In the said 3rd step, the said humidity measurement means measures the humidity of several places inside the said envelope, The test of the power distribution equipment characterized by the above-mentioned. Method.   The method for testing a distribution facility according to claim 1, wherein in the fourth step, the state of condensation is determined based on the amount of water droplets due to condensation.   The power distribution facility testing method according to claim 1, wherein in the fifth step, the influence of humidity inside the envelope and the state of condensation in the humidity on the devices and parts is investigated. Test method for power distribution equipment.   The test method for a distribution facility according to claim 1, wherein the test is performed using a test facility simulating a practical distribution facility.