Electrical equipment

Abstract

The present invention provides an electrical equipment (50) with improved reliability. The electrical equipment (50) includes a housing (15), a main circuit device (4) disposed within the housing (15) and having a main circuit device (4a) and an electric circuit (4b), protective plates (3a, 3b) provided between the housing (15) and the live portion (4c) so as to cover the live portion (4c) of the main circuit device (4), a monitoring device (30) provided between the housing (15) and the protective plates (3a, 3b) for monitoring the inside of the housing (15), and a wiring duct (13) provided separate from the live portion (4c) of the main circuit device (4), wherein a power line (11) for the monitoring device (30) and a communication line (12) for the monitoring device (30) are provided in the wiring duct (13) so as to pass through the inside of the wiring duct (13).

Description

[Technical Field]

[0001] The present disclosure relates to electrical equipment. [Background technology]

[0002] Electrical equipment that supplies electrical energy to buildings such as factories usually consists of multiple electrical devices and components housed in a box-shaped enclosure (enclosed metal panel). For example, in high-temperature environments with an average daily temperature of 30°C or higher, high-humidity environments with a relative humidity of 70% or higher, and environments with an equivalent salt deposition density of 0.03 mg / cm 2 It is known that electrical equipment placed in such a dusty environment accelerates deterioration, wear, and rust of the electrical equipment and parts inside the enclosure.

[0003] Furthermore, in electrical equipment that handles high voltages, minute amounts of moisture in the air can cause microdischarges. These microdischarges produce nitric acid, which absorbs moisture and contaminates electrical equipment. This contamination then generates even more microdischarges, resulting in tracking, a type of leakage current. Furthermore, the effects of moisture and electric fields can cause migration, in which the metals used in conductors dissolve, reducing insulation resistance. If this condition is left unchecked in electrical equipment, it can eventually lead to short circuits or ground faults.

[0004] To solve the above-mentioned problems, conventionally, a dew condensation prevention device for a closed distribution panel has been proposed that includes a sensor that monitors the relative humidity inside the electrical equipment and a heater that raises the temperature inside the electrical equipment when the relative humidity is high, thereby lowering the relative humidity (see, for example, Patent Document 1). Also proposed is a monitoring system that includes a sensor for detecting insulation deterioration inside the electrical equipment, a converter box and sensor box for processing signals from the sensor, and a gateway for transmitting these signals to the outside (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Publication number 2-18643 [Patent Document 2] JP 2017-60244 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the conventional device disclosed in Patent Document 1, for example, the power supply line and communication line of the sensor generate electromagnetic waves, which causes a problem of noise affecting the main circuit of the electrical equipment. Specifically, the electromagnetic waves generated from the power supply line and communication line of the sensor cause noise effects on the signals of the current transformers and voltage transformers in the main circuit of the electrical equipment, as well as noise effects on the signals that operate the switchgear of the main circuit. There is also the problem of noise being generated in the communication line of the sensor due to the electromagnetic waves received from the main circuit of the electrical equipment. Furthermore, since electric circuits in electrical equipment generate heat, the temperature inside the electrical equipment is generally higher than the temperature outside the electrical equipment. When sensors, signal processing devices that process signals from the sensors, and communication terminals such as routers or gateways that transmit these signals to the outside are installed inside the electrical equipment, there is a problem that the lifespan of these devices is shortened due to exposure to high ambient temperatures.

[0007] The present disclosure discloses a technique for solving the above-mentioned problems, and is directed to the effects of noise on main circuit devices caused by electromagnetic waves generated from the power lines and communication lines of monitoring devices, circuit machine The present invention aims to provide electrical equipment that can suppress the influence of noise on communication lines of monitoring equipment caused by electromagnetic waves generated from a device and can also suppress deterioration of the monitoring equipment over time, thereby improving reliability. [Means for solving the problem]

[0008] The electrical equipment of the present disclosure includes a housing, a R, Main circuit device having main circuit equipment and an electric circuit, charging of said main circuit device Part and front Recording box Body and A protective plate installed between ,before The present invention is also provided with a monitoring device provided between the housing and the protective plate, and a wiring duct provided separate from the charging section of the main circuit device, wherein a power line and a communication line for the monitoring device are provided in the wiring duct so as to pass through the inside of the wiring duct. The protective plates are provided between the front side of the housing and the charging unit, and between the rear side of the housing and the charging unit, respectively, and the wiring duct is provided in the front-rear direction along the side of the housing from the protective plate provided on the front side of the housing to the protective plate provided on the rear side of the housing. It is something. [Effects of the Invention]

[0009] According to the electrical equipment of the present disclosure, the influence of noise on main circuit equipment caused by electromagnetic waves generated from the power lines and communication lines of monitoring equipment, circuit machine This can suppress the noise that the electromagnetic waves generated from the device have on the communication lines of the monitoring equipment, and also suppress deterioration of the monitoring equipment over time, resulting in electrical equipment with improved reliability. [Brief explanation of the drawings]

[0010] [Figure 1A] 1 is a side view showing an electrical installation according to a first embodiment. [Figure 1B] 1B is a view of the electrical equipment shown in FIG. 1A taken along the arrow AA. [Figure 1C] 1 is a perspective view of a wiring duct provided in the electrical equipment according to the first embodiment. [Figure 2] FIG. 10 is a side view showing a modified example of the electrical equipment according to the first embodiment. [Figure 3] 2 is a side view showing an example of an internal temperature distribution of the electrical equipment according to the first embodiment. FIG. [Figure 4] 1 is a block diagram showing an example of the configuration of a monitoring device for electrical equipment according to a first embodiment. [Figure 5A] FIG. 10 is a side view showing the electrical equipment according to the second embodiment. [Figure 5B] FIG. 10 is a side view showing a modified example of the electrical equipment according to the second embodiment. [Figure 6] 5B is a view of the electrical equipment shown in FIG. 5A taken along the arrow BB. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, an electrical installation according to a first embodiment will be described with reference to the drawings. In addition, the same reference numerals in each drawing indicate the same or equivalent parts.

[0012] Embodiment 1 Fig. 1A is a side view showing electrical equipment according to embodiment 1, and Fig. 1B is a view taken along the line AA of the electrical equipment shown in Fig. 1A. However, Fig. 1B does not show a sensor or camera 7, a signal processing device 8, a communication terminal 9, a power source 10, a power line 11, and a communication line 12. Fig. 1C is a perspective view of a wiring duct provided in the electrical equipment according to embodiment 1, and Fig. 2 is a side view showing a modified example of the electrical equipment according to embodiment 1.

[0013] As shown in FIGS. 1A, 1B, and 2, electrical equipment 50 of the first embodiment includes a main circuit device 4, such as a circuit breaker, and an electrical circuit 4b, housed within a housing 15. Electrical circuit 4b is connected to a cable 26 for transmitting power to the exterior of electrical equipment 50 via a terminal 27. In electrical equipment 50, housing 15 is provided on a raised portion 6 to prevent water from entering floor 14, and a ceiling 5 is provided above housing 15. Protective plates 3a and 3b are provided on the inside of front door 1 and rear door 2 of electrical equipment 50 to allow inspection of the interior of electrical equipment 50 without touching the live portion 4c of main circuit device 4 within electrical equipment 50. The live portion 4c is a conductor and conductive part to which a voltage is applied, and is a conductive part connected to a power supply system during normal use. "Charging" refers to a state in which a voltage is applied.

[0014] FIG. 3 is a side view showing an example of the internal temperature distribution of the electrical equipment according to the first embodiment. FIG. 3 shows an example of measured values, in units of PU (per unit), of how much the internal temperature of the electrical equipment 50 rises above the ambient temperature due to the influence of solar radiation and heat generated by the electrical circuit 4b inside the housing 15. The measurement is performed before the sensor or camera 7, signal processing device 8, communication terminal 9, power supply 10, power line 11, communication line 12, and wiring duct 13 are installed. The temperature was measured at nine locations: three rows (front, center, and rear) in the front-to-back direction and three rows (top, middle, and bottom) in the height direction. As mentioned above, if the measurement point 16 at the top center of the front-to-back direction of the electrical equipment 50 is set to 1.0 PU, the measurement point 17 at the top rear of the front-to-back direction of the electrical equipment 50 is 0.91 PU. The measurement point 17 was measured in the area of ​​the live part 4c, which is inside the protective plate 3b arranged on the rear side.

[0015] Furthermore, the measurement point 18 in the middle of the center in the front-to-back direction of the electrical equipment 50 is 0.63 PU, and the measurement point 19 in the middle of the rear in the front-to-back direction of the electrical equipment 50 is 0.64 PU. Note that the measurement at measurement point 19 was taken in the area of ​​the live part 4c, which is inside the protective plate 3b arranged on the rear side. Furthermore, measurement point 20 on the upper front side of electrical equipment 50 in the front-to-back direction is 0.63 PU, measurement point 21 on the middle front side of electrical equipment 50 in the front-to-back direction is 0.47 PU, and measurement point 22 on the lower front side of electrical equipment 50 in the front-to-back direction is 0.09 PU. Measurement points 20, 21, and 22 are inside front door 1 provided on the front side of housing 15, and measurements were taken on the outside of protective plate 3a arranged on the front side.

[0016] Furthermore, the measurement point 23 at the lower center in the front-to-rear direction of the electrical equipment 50 is 0.18 PU, and the measurement point 24 at the lower rear in the front-to-rear direction of the electrical equipment 50 is 0.13 PU. Note that measurement point 24 was taken in the area of ​​the live part 4c, which is inside the protective plate 3b arranged on the rear side. From the example shown in FIG. 3, it can be seen that the temperature increases from the floor 14 to the ceiling 5 in the housing 15 of the electrical equipment 50. It can also be observed that even at the same height, the temperature in the center of the electrical equipment 50 is high, and the temperature rise from the ambient temperature on the front door 1 side and the rear door 2 side is relatively low. Furthermore, within the housing 15, the live unit 4c is separated on the front side by a protective plate 3a and on the rear side by a protective plate 3b, and it can be seen that the temperature rise from the ambient temperature is even lower on the side of the protective plate 3a where the electrical equipment 50 is located inside the housing 15. It can also be inferred that, as with the front side, the temperature rise from the ambient temperature is even lower on the side of the protective plate 3b inside the housing 15 on the rear side than in the area of ​​the live unit 4c, which is located inside the protective plate 3b.

[0017] 1A, in electrical equipment 50 according to embodiment 1, sensor or camera 7, signal processing device 8, communication terminal 9, and power supply 10 for these devices are arranged in the space between front door 1 and protective plate 3a provided on the front side of housing 15. In addition, sensor or camera 7 and signal processing device 8 are also arranged in the space between rear door 2 and protective plate 3b provided on the rear side of housing 15. In electrical equipment 50 according to the first embodiment, partitioned wiring ducts 13 are arranged in the front-to-rear direction of housing 15 between protective plate 3a provided on the front side of housing 15 and protective plate 3b provided on the rear side. As shown in FIG. 1B , these wiring ducts 13 are arranged at the lower right and lower left corners of floor 14 of housing 15. Considering the temperature inside housing 15, wiring duct 13 is preferably arranged at the corners of floor 14 of housing 15. However, wiring duct 13 only needs to be arranged at one of the four corners of housing 15 when viewed from the front of housing 15, and may be arranged at multiple corners.

[0018] 1C, the partitioned wiring duct 13 is made of, for example, metal and is grounded before use. The interior of the wiring duct 13 is hollow. The wiring duct 13 is provided in the front-to-rear direction along the side of the housing 15 between the front protective plate 3a and the rear protective plate 3b. The front or rear of the wiring duct 13 may be open, or may be closed with, for example, a metal lid. The power supply lines 11 and communication lines 12 for the sensor or camera 7 and signal processing device 8 are routed to the rear of the housing 15 through this partitioned wiring duct 13. In the electrical equipment 50 according to the first embodiment, the monitoring devices 30, including the sensor or camera 7, signal processing device 8, communication terminal 9, and power source 10, are installed in locations within the electrical equipment 50 where the temperature rise is low, thereby preventing these devices from being affected by heat and from deteriorating over time.

[0019] As mentioned above, within the wiring duct 13, there are wired power lines 11 for connecting the sensor or camera 7, signal processing device 8, and communication terminal 9 to the power source 10, and communication lines 12 for connecting the sensor or camera 7, signal processing device 8, and communication terminal 9. In addition, a power line 11 for connecting the sensor or camera 7, signal processing device 8, and communication terminal 9 to a power source 10, and a communication line 12 for connecting the sensor or camera 7, signal processing device 8, and communication terminal 9 are wired in the space between the front door 1 and protective plate 3a on the front side of the housing 15, and in the space between the rear door 2 and protective plate 3b on the rear side of the housing 15.

[0020] The wiring duct 13 provided on the floor 14 and the area outside the protective plates 3a, 3b inside the housing 15 are isolated from the high-voltage live section 4c. Therefore, in the electrical equipment 50 according to the first embodiment, it is possible to suppress the influence of electromagnetic waves from the main circuit device 4a to the communication line 12, and also to suppress the influence of electromagnetic waves from the power line 11 and the communication line 12 on the signals of the main circuit device 4a. The sensors may be, for example, a temperature sensor that measures temperature, a humidity sensor that measures relative humidity, a dust sensor that measures particles such as PM2.5, a partial discharge sensor that detects partial discharge, which is a sign of insulation deterioration, a microphone that measures sound, etc. The sensor or camera 7 detects the condition inside the housing 15 as a signal. The signal processing device 8 is a filter that extracts only signals in a specific frequency band, for example, from several kHz to 100 kHz, in a partial discharge sensor, etc. The signal processing device 8 analyzes, processes, and processes the information of the signal from the sensor or camera 7. The communication terminal 9 is, for example, a Wi-Fi router, and is a communication device for transmitting a signal from the sensor or camera 7 to the outside.

[0021] Fig. 2 is a side view showing a modified example of the electrical equipment according to Embodiment 1. As shown in Fig. 2, for example, by arranging the heat-sensitive sensor or camera 7 and signal processing device 8 in a position closer to the floor 14 than the center of the housing 15, the influence of the temperature rise inside the housing 15 can be further suppressed. FIG. 4 is a block diagram showing an example of the configuration of a device that monitors the internal state of electrical equipment according to the first embodiment. As shown in Figure 4, the monitoring equipment 30 that monitors the internal condition of the electrical equipment 50 includes a sensor or camera 7 that detects abnormalities within the housing 15, a signal processing device 8 that processes signals from the sensor or camera 7, a communication terminal 9 that transmits signals from the sensor or camera 7 to the outside, and a power source 10 that supplies electricity to these devices, all of which are housed within the electrical equipment 50.

[0022] The configuration of the monitoring device 30 that monitors the internal state shown in Fig. 4 is an example, and is not limited to the arrangement shown in Fig. 4. Sensors different from the configuration shown in Fig. 4 may be installed, or signal processing may not be performed, the communication terminal 9 may be placed outside the electrical equipment 50, or the communication line 12 and the power line 11 may be a single shared line. Also, the monitoring device 30 may not include the power supply 10. 1A and 2, the arrangement of the sensors or cameras 7 and the like is merely an example, and is not limited to the arrangement shown in FIGS. 1A and 2. For example, the sensors or cameras 7 and the signal processing devices 8 may be arranged only on the front side, or only on the rear side. There may also be electrical equipment 50 with a shape different from that shown in FIGS. 1A and 2.

[0023] Furthermore, in conventional electrical equipment, sensors or cameras generally have a shorter expected lifespan than the main circuit of the electrical equipment, and when a failure occurs, it is necessary to power down the main circuit in order to remove or replace the sensor or camera. In electrical equipment 50 according to the first embodiment, power supply 10 for monitoring equipment 30 that monitors the internal states of sensors or cameras 7, signal processing devices 8, communication terminals 9, etc., and main power supply 28 for the main circuit are provided as separate power supplies. Also, in electrical equipment 50 according to the first embodiment, as described above, power supply lines 11 and communication lines 12 for sensors or cameras 7 and signal processing devices 8 are routed to the rear of housing 15 through wiring duct 13. Furthermore, sensor or camera 7, signal processing device 8, communication terminal 9, and power supply 10 for these devices are attached in the space between front door 1 and protective plate 3a on the front side of housing 15. Furthermore, sensor or camera 7 and signal processing device 8 are attached in the space between rear door 2 and protective plate 3b on the rear side of housing 15.

[0024] As a result, even if the monitoring device 30 that monitors the internal state, such as the sensor or camera 7, breaks down, a power outage in the main circuit device 4 can be avoided and replacement work can be easily performed without touching the charging part 4c. Furthermore, when removing the power line 11 and the communication line 12, the power line 11 and the communication line 12 can be laid or removed without touching the charging part 4c. For example, a camera can be identified as having a malfunction if it stops capturing images, while a temperature sensor can be determined to have failed if it stops transmitting temperature and humidity data, or if it continues to measure temperatures that are clearly abnormal, such as 200°C or -50°C.

[0025] If the monitoring device 30 that monitors the internal status of the sensor or camera 7 or other device is determined to be faulty, the replacement procedure involves first turning off the power supply 10 and opening the front door 1 or rear door 2 of the housing 15. Then, while the protective plate 3a or 3b is in a state where the possibility of contacting the live part 4c is reduced, the power line 11 and communication line 12 are removed from the sensor or camera 7 and signal processing device 8. The power line 11 and communication line 12 are then pulled from the outside of the protective plate 3a or 3b and replaced. As described above, if the sensor or camera 7 or other device is determined to be faulty, the replacement procedure is carried out according to the above-described procedure. Furthermore, if this measure alone poses a risk of contacting the live part 4c during replacement, it goes without saying that the main circuit device 4 must be powered down for safety reasons, even if the power supply 10 is separate from the main power supply 28.

[0026] As described above, the electrical equipment 50 according to embodiment 1 includes a housing 15, a main circuit device 4 arranged within the housing 15 and having a main circuit device 4a and an electrical circuit 4b, protective plates 3a, 3b provided between the housing 15 and the charging section 4c so as to cover the charging section 4c of the main circuit device 4, a monitoring device 30 provided between the housing 15 and the protective plates 3a, 3b to monitor the inside of the housing 15, and a wiring duct 13 provided isolated from the charging section 4c of the main circuit device 4, and the power line 11 of the monitoring device 30 and the communication line 12 of the monitoring device 30 are provided in the wiring duct 13 so as to pass through the inside of the wiring duct 13. Moreover, according to the electrical equipment 50 of the first embodiment, only the power line 11 and the communication line 12 of the monitoring device 30 are wired inside the wiring duct 13.

[0027] Moreover, according to the electrical equipment 50 of the first embodiment, the monitoring device 30 includes a sensor or camera 7 for detecting an abnormality inside the housing 15. Moreover, according to the electrical equipment 50 of the first embodiment, the monitoring device 30 includes a signal processing device 8 for processing a signal from the sensor or camera 7. Moreover, according to the electrical equipment 50 of the first embodiment, the monitoring device 30 includes a communication terminal 9 for communicating with the outside, and the signal is transmitted to the outside of the housing 15 via the communication terminal 9. Moreover, according to the electrical equipment 50 of the first embodiment, the monitoring device 30 includes a power supply 10 that supplies electricity to the sensor or camera 7, the signal processing device 8, and the communication terminal 9 via a power line 11, and the power supply 10 is provided separately from the main power supply 28 of the main circuit device 4.

[0028] Furthermore, in the electrical equipment 50 according to the first embodiment, the wiring duct 13 is made of metal and is grounded. By 0 In this example, protective plates 3a, 3b are provided between the front side of housing 15 and charging unit 4c and between the rear side of housing 15 and charging unit 4c, respectively, and wiring duct 13 is provided in the front-rear direction along the side of housing 15 from protective plate 3a provided on the front side of housing 15 to protective plate 3b provided on the rear side. Also, in electrical equipment 50 according to embodiment 1, wiring duct 13 is provided at a corner of housing 15.

[0029] The electrical equipment 50 according to the first embodiment can suppress the influence of noise on the signals of the main circuit device 4a due to electromagnetic waves generated by the power line 11 and communication line 12 of the monitoring device 30. Also, it can suppress noise generation in the communication line 12 of the monitoring device 30 due to electromagnetic waves generated from the main circuit device 4a of the electrical equipment 50. Furthermore, in the electrical equipment 50, the monitoring devices 30 such as sensors or cameras 7 are arranged in locations where the temperature rise is relatively small in addition to the ambient temperature of the electrical equipment 50, so deterioration over time of the monitoring devices 30 can be suppressed, and as a result, the reliability of the electrical equipment 50 can be improved. Furthermore, it is possible to avoid power outages in the main circuit device 4 when replacing the monitoring devices 30 such as sensors or cameras 7. As a result, in the electrical equipment 50 according to the first embodiment, the reliability and efficiency of the electrical equipment 50 can be improved.

[0030] Embodiment 2 Fig. 5A is a side view showing the electrical equipment according to embodiment 2, and Fig. 5B is a side view showing a modified example of the electrical equipment according to embodiment 2. Fig. 6 is a view taken along arrow BB of the electrical equipment shown in Fig. 5A. 5A, 5B, and 6, components with the same reference numerals as those used to explain the electrical equipment 50 according to the first embodiment indicate the same or corresponding configurations, and the description thereof will be omitted.

[0031] The following describes electrical equipment 50 according to the second embodiment, focusing on the differences from the first embodiment. 5A, 5B, and 6, electrical equipment 50 according to the second embodiment has storage section 25 defined in floor section 14 inside front door 1, and stores communication terminal 9 and power supply 10 inside storage section 25. Storage section 25 is, for example, a metal housing, and is disposed between front door 1 and protective plate 3a provided on the front side of housing 15. As a result, electrical equipment 50 according to the second embodiment can reduce the impact on the devices and wiring of electrical equipment 50 more than in the first embodiment.

[0032] 5A, in electrical equipment 50 according to the second embodiment, sensor or camera 7 and signal processing device 8 are disposed between rear door 2 and protective plate 3b provided on the rear side of housing 15. In addition, sensor or camera 7 and signal processing device 8 are attached to the upper rear section of housing 15. Fig. 5B is a side view showing a modified example of the electrical equipment according to Embodiment 2. As shown in Fig. 5B, for example, in the case of a sensor or camera 7 and a signal processing device 8 that are sensitive to heat, by arranging the sensor or camera 7 and the signal processing device 8 in a position closer to the floor 14 than the center of the housing 15, the influence of a rise in temperature inside the housing 15 can be further suppressed.

[0033] As described above, according to the electrical equipment 50 of the second embodiment, the housing 15 and the protection plate 3 a and A storage section 25 is provided on the floor 14 of the housing 15 between the two, and the power supply 10 and the communication terminal 9 are stored in the storage section 25. As a result, the reliability of the electrical equipment 50 according to the second embodiment can be further improved. The electrical equipment 50 according to the first and second embodiments relates to, for example, a high-voltage switchgear or a distribution board having a monitoring device 30 such as a sensor for detecting abnormalities in the electrical equipment 50.

[0034] Although the present disclosure describes various exemplary embodiments and examples, the various features, aspects, and functions described in one or more embodiments are not limited to application to a particular embodiment, but may be applied to the embodiments alone or in various combinations. Therefore, countless variations not exemplified are conceivable within the scope of the technology disclosed in this specification, including, for example, cases where at least one component is modified, added, or omitted, and cases where at least one component is extracted and combined with components of another embodiment. [Explanation of symbols]

[0035] 1 front door, 2 rear door, 3a, 3b protective plate, 4 main circuit device, 4a main circuit equipment, 4b electrical circuit, 4c live section, 5 ceiling section, 6 bulkhead, 7 sensor or camera, 8 signal processing device, 9 communication terminal, 10 power supply, 11 power line, 12 communication line, 13 wiring duct, 14 floor section, 15 housing, 16, 17, 18, 19, 20, 21, 22, 23, 24 measuring point, 25 storage section, 26 cable, 27 terminal, 28 main power supply, 30 monitoring equipment, 50 electrical equipment

Claims

1. Housing, a main circuit device disposed in the housing and having main circuit equipment and an electric circuit; a protective plate provided between the charging section of the main circuit device and the housing; a monitoring device disposed between the housing and the protective plate; a wiring duct provided separate from the live portion of the main circuit device; a power line for the monitoring device and a communication line for the monitoring device are provided in the wiring duct so as to pass through the inside of the wiring duct; the protective plate is provided between the front surface side of the housing and the charging unit, and between the rear surface side of the housing and the charging unit, The wiring duct is an electrical equipment that is provided in the front-to-back direction along the side of the housing from the protective plate provided on the front side of the housing to the protective plate provided on the rear side of the housing.

2. 2. The electrical equipment according to claim 1, wherein only the power line and the communication line of the monitoring device are wired inside the wiring duct.

3. 3. The electrical equipment according to claim 1, wherein the monitoring device includes a sensor or a camera for detecting an abnormality inside the housing.

4. The electrical installation according to claim 3 , wherein the monitoring equipment includes a signal processing device for processing signals from the sensor or camera.

5. the monitoring device includes a communication terminal for communicating with the outside, The electrical equipment according to claim 4 , wherein the signal is transmitted to the outside of the housing via the communication terminal.

6. the monitoring device includes a power source that supplies electricity to the sensor or camera, the signal processing device, and the communication terminal via the power line; The electrical equipment according to claim 5, wherein the power supply is provided separately from a main power supply of the main circuit device.

7. a storage section is provided on a floor of the housing between the housing and the protective plate provided on the front side of the housing, The electrical equipment according to claim 6, wherein the power source and the communication terminal are housed in the housing.

8. 3. The electrical equipment according to claim 1, wherein the wiring duct is made of metal and is grounded.

9. The electrical equipment according to claim 1 or 2, wherein the wiring duct is provided at a corner of the housing.

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