JP5608777B2 - Closed electrical equipment - Google Patents

Description

  The present invention relates to a closed type electric facility used as a power receiving / transforming facility such as a closed type switchgear.

  Generally, a closed type electrical equipment used as a receiving and transforming equipment such as a closed type switchgear has a substantially box-shaped housing made of metal, and a main bus and various electrical devices are provided in the housing, for example. ing. The specific electric equipment provided in the housing varies depending on the use of the closed type electric equipment, but is, for example, a circuit breaker, a lightning arrester, a meter transformer, or the like.

  Since the main bus provided in the enclosure of the closed electrical equipment is a conductor that applies a high voltage, the main bus is supported on the wall of the enclosure via an insulating support in the enclosure. For the insulating support, for example, a support insulator formed of a synthetic resin such as an epoxy resin is used. Circuit breakers, lightning arresters, and the like are also supported by an insulating support as necessary.

  Closed electrical equipment is often installed outdoors. A ventilation hole is formed in a casing or the like of the closed electrical equipment, and the inside of the casing is ventilated through the ventilation hole to suppress an increase in temperature in the casing. Some closed-type electric equipment is provided with a ventilation fan to forcibly ventilate (see Patent Document 1).

JP 2012-016194 A

  By the way, in a closed type electric facility, the insulation resistance of the insulating support that supports the main bus bar and the like while insulating the surroundings from the surroundings decreases due to, for example, the following factors.

  That is, dust or the like adheres to and accumulates on the surface of the insulating support, and in this state, when the relative humidity in the casing increases, the attached dust or the like absorbs moisture. For this reason, the insulation resistance of an insulation support body falls and the leakage current from a main bus etc. increases. In addition, a minute discharge is likely to occur due to an increase in leakage current, and when the minute discharge is repeated, dryness is formed on the surface of the insulating support due to Joule heat generated thereby, and so-called tracking deterioration occurs. This also reduces the insulation resistance of the insulating support. Furthermore, if the micro discharge is repeated for a long time, ozone gas stays in the housing. The residence of ozone gas accelerates the progress of the deterioration and corrosion of the insulating support, and causes a further decrease in insulation resistance.

  If the insulation resistance of the insulating support significantly decreases, there is a risk of causing a ground fault, a short-circuit accident, and the like. Therefore, it is desirable to detect the decrease or tendency of the insulation resistance of the insulating support at an early stage.

  However, it is not easy to detect the decrease in the insulation resistance of the insulating support in the closed type electrical equipment at an early stage for the following reason.

  In other words, by directly measuring the progress of the deterioration and corrosion of the insulating support, it is possible to find a decrease in the insulation resistance of the insulating support, but for that purpose the operation of the closed electrical equipment must be stopped. . Stopping the operation of closed-type electrical equipment must be avoided as much as possible because it restricts or stops power supply.

  In addition, it is conventionally known that the decrease in insulation resistance of the insulating support is caused by the progress of deterioration and corrosion of the insulating support. It has been found in recent years that it also occurs at the stage. That is, as described above, when the relative humidity increases in a state where dust or the like adheres and accumulates around the insulating support, the dust is absorbed and moistened, thereby reducing the insulation resistance of the insulating support. It is desired that such a decrease in insulation resistance in the initial stage is also detected as an increase in the risk of accidents, and that measures are taken to prevent accidents. However, since the decrease in insulation resistance in the initial stage occurs even in a state where the deterioration / corrosion of the insulating support has not progressed so much, this was discovered by the method of directly measuring the progress of the deterioration / corrosion of the insulating support. Difficult to do.

  The present invention has been made in view of the above-described problems, for example, and an object of the present invention is to provide a closed type electric facility that can detect a decrease in the insulation resistance of an insulating support or its tendency at an early stage. It is in.

  In order to solve the above problems, a first closed electrical apparatus of the present invention is provided in a housing, a conductor or an electric device for applying a high voltage provided in the housing, and the housing. An insulating support that supports the conductor or electric device to which the high voltage is applied in the casing in a state insulated from the surroundings, and a conductor or electric device that applies the high voltage generated via the insulating support. A camera that captures light emitted from the discharge from the battery, a recording unit that records an image captured by the camera, a humidity detector that detects relative humidity in the housing, and a relative humidity detected by the humidity detector. And a controller that starts photographing of the light emission by the camera and recording of the image by the recording unit when a first humidity reference value is exceeded.

  Further, the second closed electrical installation of the present invention is the above-described first closed electrical installation of the present invention, wherein the control unit is configured such that the relative humidity detected by the humidity detection unit is a second humidity reference value. The shooting of the light emission by the camera and the recording of the image by the recording unit are stopped when:

  Moreover, the 3rd closed type electrical installation of this invention is equipped with the ozone detection part which detects the density | concentration of the ozone gas in the said housing in the 1st or 2nd closed type electrical installation of this invention mentioned above, The said control part Is when the relative humidity detected by the humidity detector exceeds the first humidity reference value, or when the concentration of ozone gas detected by the ozone detector exceeds the first concentration reference value. The photographing of the light emission by the camera and the recording of the image by the recording unit are started.

  The fourth closed electrical installation of the present invention is the above-described third closed electrical installation of the present invention, wherein the control unit is configured such that the relative humidity detected by the humidity detection unit is a second humidity reference value. And when the concentration of ozone gas detected by the ozone detector becomes equal to or less than a second concentration reference value, the photographing of the light emission by the camera and the recording of the image by the recording unit are stopped. And

  Further, a fifth closed-type electrical installation of the present invention is the above-described third or fourth closed-type electrical installation of the present invention, wherein the control unit has a concentration of ozone gas detected by the ozone detector. When a concentration reference value of 1 is exceeded, a notification signal indicating the retention of ozone gas in the housing is output.

  According to the present invention, a decrease in the insulation resistance of an insulating support or its tendency can be detected early.

It is sectional drawing which shows the inside of the closed type switchgear by embodiment of this invention. It is a block diagram which shows a camera, an automatic recording device, a humidity sensor, an ozone sensor, etc. in the closed type switchgear by embodiment of this invention. It is a flowchart which shows the process by the automatic recording device by embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a closed type switchgear which is an embodiment of a closed type electrical installation of the present invention. In FIG. 1, a closed type switchgear 1 according to an embodiment of the present invention is a high-voltage receiving / transforming equipment installed, for example, outdoors in a substation site. The closed switchgear 1 includes a housing 2. The casing 2 is formed in a hollow box shape with a floor plate 2A, four side plates 2B (only part of which is shown) and a top plate 2C each formed of metal, and is formed on the front side plate 2B and the rear side plate 2B. Are provided with metal doors 3 and 4. In addition, a plurality of metal partition walls 5 are provided inside the housing 2, and by these partition walls 5, a plurality of chambers in the housing 2, specifically, a main bus room 6, a lightning arrester room 7, and a shut-off. A container room 8, a cable room 9, and the like are configured.

  In the housing 2, conductors for applying a high voltage for realizing the function of the power receiving / transforming equipment, electrical devices, and the like are provided. Specifically, a main bus 11 which is a conductor for applying a high voltage is provided in the main bus chamber 6 of the housing 2, and a lightning arrester 12 is provided in the lightning arrester chamber 7. Further, the circuit breaker chamber 8 is provided with a circuit breaker 13, and the cable chamber 9 is provided with a power cable 14. In the lower part of the housing 2, the main bus chamber 6 and the cable chamber 9 communicate with each other, and a bus 15 that is a conductor for applying a high voltage is provided at the communicating portion. A control panel (not shown) is attached to a side plate on the side surface in the housing 2.

  The main bus bar 11 is supported by the partition wall 5 or the like via a plurality of insulating supports 21. Each insulating support 21 is a support insulator formed of an insulating material, for example, a synthetic resin such as an epoxy resin. By these insulating supports 21, the main bus bar 11 is insulated from surrounding objects including the partition wall 5 and the like on which the main bus bar 11 is supported. Similarly to the main bus 11, the bus 15 is also supported by the insulating support 21 while being insulated from the surroundings.

  The housing 2 is provided with a plurality of vent holes. Specifically, a vent 22 is provided in the lower part of the door 3, and a vent 23 is provided in the lower part of the door 4. Further, a duct 26 is provided above the top plate 2C, and vent holes 24 and 25 are provided at the front end portion and the rear end portion of the duct 26, respectively. Outside air can be circulated in the housing 2 through these vent holes 22 to 25. Further, an electric fan 27 is provided on the front end side of the duct 26 and in the vicinity of the vent hole 24. The fan 27 can force the outside air to flow through the duct 2 via the duct 26.

  The space in the housing 2 is partitioned by a partition wall 5 and divided into a main bus room 6, a lightning arrester room 7, a circuit breaker room 8, a cable room 9, and the like. Rather, it is configured to allow air to flow between the inside and outside of each chamber. For example, a gap allowing air flow is formed between the top plate 2C, the side plate 2B or the floor plate 2A and the partition wall 5, and a slit or the like is provided in the partition wall 5 as necessary to ensure the air flow. Is formed.

  A camera 31 is provided in the main bus chamber 6 of the housing 2. The camera 31 captures light emitted by the micro discharge from the main bus 11 generated through the insulating support 21 disposed in the main bus chamber 6. This light emission is a spark due to a micro discharge caused by a leakage current flowing from the main bus 11 to the surface of the insulating support 21 due to a decrease in the insulation resistance of the insulating support 21.

  The camera 31 is a digital video camera, for example, and is preferably small. By making the camera 31 small, the camera 31 can be easily installed in a small space of the main bus room 6. The camera 31 has a function of starting shooting or stopping shooting according to a control signal output from the outside.

  The camera 31 is preferably highly sensitive, and a night vision camera may be used as the camera 31. The main bus room 6, the lightning arrester room 7, the circuit breaker room 8, and the cable room 9 in the housing 2 are shielded from light by the housing 2 and the partition wall 5, respectively, and are completely dark even during the day when the doors 3 and 4 are closed. It is a state. The gaps and slits through which air flows are formed so as to block light while allowing air to flow. By making the camera 31 highly sensitive, when the light emission due to the micro discharge occurs in the dark main bus chamber 6, the light emission can be clearly photographed.

  In addition, the camera 31 is disposed at a position where it is possible to take an image of light emission caused by a micro discharge generated through the plurality of insulating supports 21 disposed in the main bus chamber 6. Specifically, the camera 31 is disposed in the upper part of the main bus room 6 and attached to the top board 2C. The lens 32 of the camera 31 is directed downward from the upper portion of the main bus chamber 6, and a plurality of insulating supports 21 arranged from the upper portion to the lower portion of the main bus chamber 6 are in the field of view (shootable range) of the camera 31. In. Therefore, the light emitted from the insulating support 21 can be photographed by the camera 31.

  As shown in FIG. 1, a part of the main bus bar 11 extends to the right side in FIG. 1 and reaches a region 6 </ b> A located between the lightning arrester chamber 7 and the circuit breaker chamber 8. This area 6 </ b> A is blocked by a part of the partition wall 5 and does not enter the field of view of the camera 31. However, the shootable range of the camera 31 reaches the vicinity of the insulating support 21 arranged in this region, and there is no light shielding object between the shootable range and the insulating support 21. Therefore, when light is emitted from the insulating support 21 arranged in the region 6A, the light reaches the photographing possible range of the camera 31. As a result, the camera 31 can capture light emitted from the insulating support 21 arranged in the region 6A.

  In addition, an automatic recording device 33 that records image (video) data generated by the camera 31 capturing an image is provided in the housing 2. The automatic recording device 33 is disposed, for example, in the vicinity of the door 3 in the housing 2 so that the operator can operate the automatic recording device 33. Details of the automatic recording device 33 will be described later.

  In addition, a humidity sensor 34 as a humidity detection unit is provided in the housing 2. The humidity sensor 34 detects the relative humidity in the housing 2, particularly in the main bus room 6. As the humidity sensor 34, for example, an electric hygrometer can be used. It is desirable to arrange the humidity sensor 34 in the lower part in the housing 2. In the housing 2, the temperature in the lower portion is lower than that in the upper portion, and thus the relative humidity becomes higher. Therefore, by arranging the humidity sensor 34 in the lower portion in the housing 2, the relative humidity in the housing 2 is reduced. The rise can be detected sensitively. In the present embodiment, the humidity sensor 34 is disposed below the main bus chamber 6 in order to detect the relative humidity in the main bus chamber 6 with high sensitivity.

  Further, an ozone sensor 35 as an ozone detector is provided in the housing 2. The ozone sensor 35 detects the concentration of ozone gas remaining in the housing 2. As the ozone sensor 35, for example, a constant potential electrolysis diffusion type ozone concentration meter or the like can be used. Since ozone gas is heavier than air, it stays on the bottom side in the housing 2. The ozone sensor 35 is disposed in the lower part or the bottom part of the housing 2, whereby the concentration of ozone gas staying in the housing 2 can be accurately detected.

  FIG. 2 shows the camera 31, the automatic recording device 33, the humidity sensor 34, the ozone sensor 35, and the like in FIG. In FIG. 2, as described above, the automatic recording device 33 is a device having a function of recording image data generated by the camera 31 performing photographing. In addition to this function, the humidity sensor 34 or the ozone sensor Based on the detection signal output from 35, the camera 31 also has a function of controlling the start and stop of shooting. The automatic recording device 33 includes a CPU (central processing unit) 41, a recording unit 42, and several interfaces 43 to 46. The automatic recording device 33 includes an operation unit (not shown) having a changeover switch, a push button, and the like, and the operator operates the operation unit to switch the operation mode of the automatic recording device 33. The image data recorded in the automatic recording device 33 can be output.

  A humidity sensor 34 and an ozone sensor 35 are connected to the CPU 41 via an interface 43. The humidity sensor 34 outputs a detection signal indicating the relative humidity value in the housing 2 to the CPU 41. The ozone sensor 35 outputs a detection signal indicating the concentration of ozone gas in the housing 2 to the CPU 41. Further, the camera 31 is connected to the CPU 41 via interfaces 44 and 47. The CPU 41 outputs to the camera 31 a control signal instructing to start shooting and a control signal instructing to stop shooting. Further, the camera 31 outputs image data generated by photographing to the CPU 41. A recording unit 42 is connected to the CPU 41. The recording unit 42 is, for example, a hard disk device or a flash memory. The CPU 41 outputs the image data output from the camera 31 to the recording unit 42, and the recording unit 42 records the image data output from the CPU 41. Further, the CPU 41 has a function of outputting the image data recorded in the recording unit 42 to the outside via the interface 45. Further, the CPU 41 has a function of outputting an ozone gas retention notification signal (to be described later) via the interface 46 based on the detection signal from the ozone sensor 35. In addition, the automatic recording device 33 is provided with a lamp 48 that is lit or blinks according to the output of the ozone gas retention notification signal.

  FIG. 3 shows an automatic recording process in the automatic recording device 33. When the automatic recording device 33 is operated, the automatic recording process shown in FIG. 3 is started. In the automatic recording process, first, the CPU 41 of the automatic recording device 33 determines whether the operation mode of the automatic recording device 33 is the automatic recording mode or the manual recording mode (step S1). Here, the automatic recording mode means that the automatic recording device 33 starts and stops photographing by the camera 31 and the image output from the camera 31 based on the detection signal output from the humidity sensor 34 or the ozone sensor 35. This mode automatically starts and stops data recording. On the other hand, the manual recording mode is a mode in which the start and stop of photographing by the camera 31 and the start and stop of recording of image data output from the camera 31 are performed by an operator's manual operation. For example, the operator can select and set either the automatic recording mode or the manual recording mode by operating a changeover switch provided in the operation unit of the automatic recording device 33. When the operation mode of the automatic recording device 33 is the manual recording mode (step S1: NO), the operator manually starts and stops photographing by the camera 31 by manually operating the operation unit of the automatic recording device 33. At the same time, recording of image data output from the camera 31 is started and stopped (step S2).

  On the other hand, when the operation mode of the automatic recording device 33 is the automatic recording mode (step S1: YES), the CPU 41 starts and stops photographing with the camera 31, and starts recording image data output from the camera 31. Then, the process proceeds to step S3 in order to automatically perform the stop. In step S <b> 3, the CPU 41 is in a state in which the relative humidity in the housing 2 exceeds the humidity reference value set in advance and recorded in the recording unit 42 based on the detection signal output from the humidity sensor 34. It is determined whether or not has continued for a predetermined time.

  When the state in which the relative humidity in the housing 2 exceeds the humidity reference value continues for a predetermined time (step S3: YES), the CPU 41 outputs a control signal instructing the camera 31 to start photographing, Recording of the image data to the recording unit 42 is started (step S6). As a result, the camera 31 starts photographing the insulating support 21 arranged in the main bus chamber 6 and their surroundings, and obtains image data of an image (video) in which the insulating support 21 and their surroundings are reflected. The image data is generated and output to the CPU 41. Then, the CPU 41 outputs the image data output from the camera 31 to the recording unit 42, and the recording unit 42 records the image data output from the CPU 41. The image data is, for example, moving image data such as MPEG format or AVI format, in which the insulating support 21 and the surroundings are continuously shown.

  On the other hand, if the state in which the relative humidity in the housing 2 exceeds the humidity reference value does not continue for a predetermined time in step S3 (step S3: NO), the CPU 41 subsequently outputs from the ozone sensor 35. Based on the detected signal, it is determined whether or not the state in which the ozone gas concentration in the housing 2 is preset and exceeds the ozone gas concentration reference value recorded in the recording unit 42 continues for a predetermined time ( Step S4).

  When the state where the concentration of ozone gas in the housing 2 exceeds the concentration reference value continues for a predetermined time (step S4: YES), the CPU 41 outputs an ozone gas retention notification signal (step S5). Here, a lamp 48 (see FIG. 2) indicating ozone gas retention is provided in the operation unit of the automatic recording device 33. The lamp 48 is normally turned off, but turns on or blinks when an ozone gas retention notification signal is output. For example, the operator can easily know whether or not ozone gas stays in the housing 2 by checking the lamp 48 during periodic inspection.

  Further, when the state where the concentration of ozone gas in the housing 2 exceeds the concentration reference value continues for a predetermined time, the CPU 41 outputs a control signal instructing the start of photographing to the camera 31 and also stores the image data. Recording on the recording unit 42 is started. As a result, the camera 31 starts photographing the insulating support 21 arranged in the main bus chamber 6 and their surroundings, and obtains image data of an image (video) in which the insulating support 21 and their surroundings are reflected. The image data is generated and output to the CPU 41. Then, the CPU 41 outputs the image data output from the camera 31 to the recording unit 42, and the recording unit 42 records the image data output from the CPU 41.

  After the photographing by the camera 31 and the recording of the image data are started, the CPU 41 determines whether or not the relative humidity in the housing 2 is equal to or lower than the humidity reference value based on the detection signal output from the humidity sensor 34. At the same time, based on the detection signal output from the ozone sensor 35, it is determined whether or not the concentration of ozone gas in the housing 2 is equal to or lower than the concentration reference value (steps S7 and S8). Then, while the relative humidity in the housing 2 exceeds the humidity reference value or the ozone gas concentration exceeds the concentration reference value (step S7: NO or step S8: NO), the CPU 41 captures images and images by the camera 31. Continue recording data.

  On the other hand, when the relative humidity in the housing 2 is equal to or lower than the humidity reference value and the ozone gas concentration is equal to or lower than the concentration reference value (step S7: YES and step S8: YES), the CPU 41 instructs the camera 31 to take a picture. A control signal for instructing the stop is output and recording of the image data in the recording unit 42 is stopped (step S9). Thereby, the camera 31 stops photographing.

  On the other hand, in step S3, the CPU 41 determines that the state in which the relative humidity in the housing 2 exceeds the humidity reference value has not continued for a predetermined time, and in step S4, the concentration of ozone gas in the housing 2 is If the CPU 41 determines that the state exceeding the density reference value has not continued for a predetermined time, the CPU 41 does not output a control signal instructing the start of photographing to the camera 31 and starts recording image data in the recording unit 42. do not do. In this case, a state in which the photographing operation of the camera 31 and the recording operation of the recording unit 42 are stopped is maintained.

  When the automatic recording device 33 is in the automatic recording mode, the processes of steps S3 to S9 are repeatedly executed. For example, the operator opens the door 3, connects a personal computer or an external memory or the like to the automatic recording device 33, operates the operation unit of the automatic recording device 33, and operates the automatic recording device 33. The image data recorded in the recording unit 42 is transferred to a personal computer or an external memory. Subsequently, the operator returns to the office or the like, reproduces the image data transferred to the personal computer or the external memory, confirms it visually, or analyzes the image data with an image analyzer or the like, and It is confirmed whether or not the light emission due to the micro discharge generated through the camera 21 is photographed. In the image reproduced from the image data, while no light is emitted from any of the insulating supports 21, the image only shows darkness. On the other hand, when light emission occurs in any one of the insulating supports 21, the position where the insulating support 21 is disposed becomes bright. The operator can recognize from the image whether or not light is emitted or which insulating support 21 emits light.

  When the light emission due to the minute discharge generated in the insulating support 21 is photographed, it is considered that the insulation resistance of the insulating support 21 is lowered, and therefore the operator makes the closed switchgear 1 more serious. It can be identified as a closed switchgear that requires periodic inspection, maintenance or repair. Then, the operator investigates whether dust or the like has adhered to and accumulated on the insulating support 21, investigated the cause of the relative humidity in the casing 2 of the closed switchgear 1 being increased, improved the ventilation method, Installation of a heater for lowering the relative humidity, confirmation of the progress of deterioration / corrosion of the insulating support 21, removal of ozone gas, replacement of the insulating support 21 as necessary, etc. 1, it is possible to prevent a ground fault or a short circuit accident from occurring.

  As described above, according to the closed switchgear 1 according to the embodiment of the present invention, the light emission caused by the micro discharge generated in the insulating support 21 is photographed, and the image data generated by the photographing is confirmed or image-analyzed. Since a decrease in the insulation resistance of the insulating support 21 can be found, a decrease in the insulation resistance of the insulation support 21 can be found without stopping the operation of the closed switchgear 1. By stopping the operation of the switchgear 1, it is possible to avoid the limitation or stop of the power supply.

  In addition, according to the closed switchgear 1 according to the present embodiment, a decrease in the insulation resistance of the insulating support 21 is found by confirming the light emission caused by the micro discharge generated in the insulating support 21. It is possible to detect a decrease in insulation resistance at an early stage. Therefore, it is possible to prevent a ground fault or a short circuit accident in the closed switch gear 1.

  That is, as described above, when the relative humidity becomes high and the dust or the like adhering / depositing on the surface of the insulating support 21 becomes damp, the deterioration / corrosion of the insulating support 21 still proceeds so much. Even in the initial stage, the insulation resistance may be lowered. When the insulation resistance of the insulating support 21 is lowered, the frequency of occurrence of sparks due to minute discharge increases. Therefore, according to the method of photographing and checking the light emitted from the insulating support 21, the insulation support 21 is deteriorated or corroded. Even in the initial stage where the progress is not so much, a decrease in the insulation resistance of the insulating support 21 can be found. Therefore, a decrease in the insulation resistance of the insulating support 21 and its tendency can be detected at an early stage, and a ground fault or short circuit accident can be prevented in advance.

  Further, according to the closed switchgear 1 according to the present embodiment, when the relative humidity exceeds the humidity reference value, the photographing by the camera 31 and the recording of the image data are started, so that the insulating support 21 is deteriorated and corroded. Only meaningful image data that is useful for finding a decrease in the insulation resistance of the insulating support 21 at an early stage that is not progressing much can be recorded.

  That is, in an initial stage where the deterioration / corrosion of the insulating support 21 is not progressing so much, when the relative humidity is low and dry, dust or the like adhering / depositing on the insulating support 21 is also dry. Therefore, a decrease in insulation resistance hardly occurs, and light emission due to minute discharge hardly occurs. Therefore, even if photographing with the camera 31 or recording of image data is performed while the relative humidity is low, image data useful for finding a decrease in the insulation resistance of the insulating support 21 cannot be obtained. Therefore, when the relative humidity is low, neither the photographing by the camera 31 nor the recording of the image data is performed, so that useless image data can be prevented from being recorded for a long time. As a result, it is useful to find a decrease in the insulation resistance of the insulating support 21, and only image data with a relatively short recording time can be recorded, so that the operator can use the image data. By performing the confirmation / analysis operation, a decrease in the insulation resistance of the insulating support 21 can be found efficiently and in a short time.

  In addition, according to the closed switchgear 1 according to the present embodiment, when the ozone gas concentration exceeds the concentration reference value, the photographing by the camera 31 and the recording of the image data are started. It is possible to record image data useful for finding a decrease in the insulation resistance of the insulating support 21 in the middle stage or the later stage in which the process proceeds. Therefore, the operator can eliminate the oversight of the decrease in the insulation resistance in the middle and later stages of the deterioration / corrosion progress of the insulating support 21 by performing the confirmation / analysis work using the image data.

  Further, according to the closed switchgear 1 according to the present embodiment, when the relative humidity is equal to or lower than the humidity reference value and the ozone gas concentration is equal to or lower than the concentration reference value, the photographing by the camera 31 and the recording of the image data are stopped. Therefore, it is possible to prevent useless image data that is not useful for finding a decrease in insulation resistance from being recorded. Further, by automatically performing both the start and stop of the photographing of the camera 31 and the recording of the image data, even in the unmanned closed switchgear 1, the closed switchgear 1 can be monitored for a long period of time. It becomes possible.

  Further, according to the closed switchgear 1 according to the present embodiment, when the state in which the ozone gas concentration exceeds the concentration reference value continues for a predetermined time, the ozone gas retention notification signal is output and the lamp 48 is turned on or blinked. Thus, the operator can know the stagnation of ozone gas in the housing 2. Further, the operator considers that the ozone gas is stagnant and that the light emission from the insulating support 21 is confirmed, and the progress of deterioration and corrosion of the insulating support 21 is accelerated by the influence of the ozone gas. It is possible to predict that there is a possibility that the deterioration has progressed and the progress of deterioration / corrosion has reached the middle or later stage.

  In the above-described embodiment, the case where the camera 31 is disposed on the upper part of the main bus room 6 is taken as an example, but the present invention is not limited to this. The camera 31 may be arranged at another position as long as the light emission in the insulating support 21 arranged in the main bus chamber 6 can be appropriately photographed. In addition, when the insulating supports 21 that support the main bus bar 11 are distributed in two or more rooms, two or more cameras 31 may be provided, and the cameras 31 may be arranged in each room. .

  Further, when the lightning arrester 12 and the circuit breaker 13 are supported by the insulating support 21 in addition to the main bus 11, the camera 31 may be disposed in the lightning arrester chamber 7 or the circuit breaker chamber 8.

  Further, when it is not necessary to find the deterioration or corrosion in the middle or later stage of the insulating support 21, or when this discovery can be realized by another method, a detection signal output from the ozone sensor 35 is also provided. In addition, the process of controlling the photographing of the camera 31 and the recording of the image data may be excluded. In this case, it is not necessary to provide the ozone sensor 35.

  Further, the present invention can be appropriately changed without departing from the gist or concept of the invention that can be read from the claims and the entire specification, and a closed-type electric facility with such a change is also a technique of the present invention. Included in thought.

DESCRIPTION OF SYMBOLS 1 Closed-type switchgear 2 Case 2A Bottom plate 2B Side plate 2C Top plate 3, 4 Door 5 Bulkhead 6 Main bus room 6A Area 7 Lightning arrester room 8 Circuit breaker room 9 Cable room 11 Main bus 12 Lightning arrester 13 Circuit breaker 14 Power cable 15 Bus line 21 Insulating Support 22, 23, 24, 25 Vent 26 Duct 27 Fan 31 Camera 32 Lens 33 Automatic Recording Device 34 Humidity Sensor 35 Ozone Sensor 41 CPU
42 Recording unit 43, 44, 45, 46, 47 Interface 48 Lamp

Claims (5)

A housing,
Conductors or electrical equipment for applying a high voltage provided in the housing;
An insulating support that is provided in the casing and supports the conductors or electrical equipment for applying the high voltage in the casing in a state of being insulated from the surroundings;
A camera that captures light emitted by a discharge from a conductor or an electric device that applies the high voltage generated through the insulating support;
A recording unit for recording an image taken by the camera;
A humidity detector for detecting relative humidity in the housing;
A control unit that starts photographing of the light emission by the camera and recording of the image by the recording unit when the relative humidity detected by the humidity detection unit exceeds a first humidity reference value. Characteristic closed electrical equipment.   The control unit stops photographing of the light emission by the camera and recording of the image by the recording unit when the relative humidity detected by the humidity detecting unit becomes equal to or less than a second humidity reference value. The closed electrical equipment according to claim 1. An ozone detector for detecting the concentration of ozone gas in the housing;
When the relative humidity detected by the humidity detector exceeds the first humidity reference value, or the concentration of ozone gas detected by the ozone detector exceeds the first concentration reference value. 3. The closed type electrical equipment according to claim 1, wherein photographing of the light emission by the camera and recording of the image by the recording unit are sometimes started.   When the relative humidity detected by the humidity detection unit is equal to or lower than a second humidity reference value, and the concentration of ozone gas detected by the ozone detection unit is equal to or lower than the second concentration reference value, the control unit The closed electrical equipment according to claim 3, wherein photographing of the light emission by the camera and recording of the image by the recording unit are stopped.   The said control part outputs the notification signal which shows the residence of ozone gas in the said housing | casing, when the density | concentration of the ozone gas detected by the said ozone detection part exceeds the said 1st density | concentration reference value. Item 5. The closed electrical equipment according to item 3 or 4.

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