Electric equipment
The electrical equipment design isolates monitoring device lines and provides separate power supplies to mitigate electromagnetic interference and thermal stress, improving reliability and efficiency by protecting against noise and high temperatures.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- MITSUBISHI ELECTRIC CORP
- Filing Date
- 2025-01-14
- Publication Date
- 2026-07-23
AI Technical Summary
Electrical equipment in harsh environments experiences deterioration, wear, rusting, and potential short circuits due to moisture, dust, and electromagnetic interference, with monitoring devices being affected by noise and high temperatures, leading to reduced lifespan and reliability.
The equipment design includes a housing with a main circuit device, protective plates, and a wiring duct to isolate power and communication lines of monitoring devices, suppressing electromagnetic interference and temperature effects, and providing separate power supplies for monitoring and main circuits.
This configuration enhances the reliability and longevity of monitoring devices by reducing electromagnetic interference and thermal stress, allowing for safe and efficient replacement without disrupting the main circuit.
Smart Images
Figure JP2025000820_23072026_PF_FP_ABST
Abstract
Description
Electrical equipment
[0001] This disclosure relates to electrical equipment.
[0002] Electrical equipment that supplies electrical energy to buildings such as factories usually has a configuration in which a plurality of electrical devices and components are housed in a box-shaped outer enclosure (enclosed switchboard). For example, in a high-temperature environment where the average temperature of a day is 30°C or higher, for example, in a high-humidity environment where the relative humidity is 70% RH or higher, and for example, in an environment with a high dust concentration of equivalent salt adhesion density of 0.03 mg / cm ２ It is known that electrical equipment placed in an environment with a lot of dust of 0.03 mg / cm or more promotes deterioration, wear, and rusting of electrical devices and components inside the outer enclosure.
[0003] In addition, in electrical equipment that handles high voltages, minute discharges occur due to a small amount of moisture contained in the air in these environments. Minute discharges generate nitric acid that absorbs moisture and causes contamination to electrical devices. This contamination further causes minute discharges, leading to a tracking phenomenon, which is a type of leakage phenomenon. Furthermore, due to the influence of moisture and an electric field, a migration phenomenon occurs in which the metal used for the conductor melts out, and the insulation resistance decreases. If such a state is left unattended in electrical equipment, ultimately, a short circuit or ground fault may occur.
[0004] Conventionally, in order to solve the above problems, a dew prevention device for a closed distribution board provided with a sensor for monitoring the relative humidity inside the electrical equipment and a heater for raising the temperature inside the electrical equipment and as a result lowering the relative humidity when the relative humidity is high has been proposed (for example, see Patent Document 1). Also, a monitoring system has been proposed in which a sensor for detecting insulation deterioration inside the electrical equipment, a conversion box and a sensor box for processing signals from the sensor, and a gateway for transmitting these signals to the outside are arranged (for example, see Patent Document 2).
[0005] Japanese Utility Model Publication No. 2-18643, Japanese Patent Application Laid-Open No. 2017-60244
[0006] However, in the conventional device disclosed in, for example, Patent Document 1, the power and communication lines of the sensor generate electromagnetic waves, which pose a problem as it affects the main circuit of the electrical equipment with noise. Specifically, the electromagnetic waves generated from the power and communication lines of the sensor affect the signals of current transformers and voltage transformers in the main circuit of the electrical equipment with noise, as well as affect the signals that operate the switches in the main circuit with noise. In addition, there was a problem that the communication lines of the sensor were affected by electromagnetic waves from the main circuit of the electrical equipment, causing noise. Furthermore, in electrical equipment, the circuits generate heat, so 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 sensors, and communication terminals such as routers or gateways for transmitting these signals to the outside are installed inside electrical equipment, there is a problem that the lifespan of these devices is shortened due to exposure to high ambient temperatures.
[0007] This disclosure provides technology to solve the above-mentioned problems, and aims to provide electrical equipment with improved reliability by suppressing the impact of electromagnetic waves generated from the power lines and communication lines of monitoring equipment on main circuit equipment, and the impact of electromagnetic waves generated from main circuit equipment on the communication lines of monitoring equipment, as well as suppressing the deterioration of monitoring equipment over time.
[0008] The electrical equipment of this disclosure comprises a housing, a main circuit device disposed within the housing and having a main circuit device and an electrical circuit, a protective plate provided between the housing and the live parts of the main circuit device so as to cover the live parts of the main circuit device, a monitoring device provided between the housing and the protective plate for monitoring the inside of the housing, and a wiring duct provided isolated from the live parts of the main circuit device, wherein the power line of the monitoring device and the communication line of the monitoring device are provided in the wiring duct so as to penetrate the inside of the wiring duct.
[0009] According to the electrical equipment of this disclosure, it is possible to suppress the impact of electromagnetic waves generated from the power lines and communication lines of monitoring equipment on the main circuit equipment, the impact of electromagnetic waves generated from the main circuit equipment on the communication lines of monitoring equipment, and the deterioration of monitoring equipment over time, thereby obtaining electrical equipment with improved reliability.
[0010] This is a side view showing electrical equipment according to Embodiment 1. This is a view taken along the line A-A of the electrical equipment shown in Figure 1A. This is a perspective view of a wiring duct provided in the electrical equipment according to Embodiment 1. This is a side view showing a modified version of the electrical equipment according to Embodiment 1. This is a side view showing an example of the internal temperature distribution of the electrical equipment according to Embodiment 1. This is a block diagram showing an example of the configuration of the monitoring equipment for the electrical equipment according to Embodiment 1. This is a side view showing electrical equipment according to Embodiment 2. This is a side view showing a modified version of the electrical equipment according to Embodiment 2. This is a view taken along the line B-B of the electrical equipment shown in Figure 5A.
[0011] The electrical equipment according to Embodiment 1 will be described below with reference to the drawings. In each drawing, the same reference numerals indicate the same or equivalent part.
[0012] Embodiment 1. Figure 1A is a side view showing the electrical equipment according to Embodiment 1, and Figure 1B is a view of the electrical equipment shown in Figure 1A along the line A-A. However, in Figure 1B, the sensor or camera 7, signal processing device 8, communication terminal 9, power supply 10, power line 11, and communication line 12 are not shown. Figure 1C is a perspective view of the wiring duct provided in the electrical equipment according to Embodiment 1, and Figure 2 is a side view showing a modified example of the electrical equipment according to Embodiment 1.
[0013] As shown in Figures 1A, 1B, and 2, the electrical equipment 50 of Embodiment 1 has a main circuit device 4 having main circuit equipment 4a such as a circuit breaker and an electrical circuit 4b, which is housed inside a housing 15. The electrical circuit 4b is connected to a cable 26 for transmitting power to the outside of the electrical equipment 50 via a terminal 27. In the electrical equipment 50, the housing 15 is installed on a raised section 6 to prevent water from entering the floor section 14, and a ceiling section 5 is provided above the housing 15. In addition, protective plates 3a and 3b are provided on the inside of the front door 1 and rear door 2 of the electrical equipment 50 to allow inspection of the inside of the electrical equipment 50 without touching the live parts 4c of the main circuit device 4 inside the electrical equipment 50. The live parts 4c are conductors and conductive parts to which voltage is applied, and are conductive parts that are connected to the power supply system in normal use. "Charging" means that voltage is applied.
[0014] Figure 3 is a side view showing an example of the internal temperature distribution of the electrical equipment according to Embodiment 1. Figure 3 shows an example of measured values in PU (Per Unit), where the measurement point 16 in the upper center of the front-to-back direction of the electrical equipment 50 is set to 1.0 PU, indicating how much the internal temperature of the electrical equipment 50 rises above the ambient temperature due to the effects of solar radiation and heat generated by the electrical circuit 4b inside the housing 15. Note that in Figure 3, the measurement was taken 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 were installed. Temperature measurements were taken at a total of nine locations: three rows in the front-to-back direction ("front, center, rear") and three rows in the height direction ("upper, middle, lower"). As mentioned above, when the measurement point 16 in the upper center of the front-to-back direction of the electrical equipment 50 is set to 1.0 PU, the measurement point 17 in the upper rear of the electrical equipment 50 is 0.91 PU. Note that measurement point 17 was taken in the area of the charging section 4c, which is inside the protective plate 3b located on the rear side.
[0015] Furthermore, the measurement point 18 in the middle of 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 of the electrical equipment 50 is 0.64 PU. Note that measurement point 19 is measured in the area of the live part 4c, which is inside the protective plate 3b located on the rear side. In addition, the measurement point 20 in the upper front of the electrical equipment 50 is 0.63 PU, the measurement point 21 in the middle of the front of the electrical equipment 50 is 0.47 PU, and the measurement point 22 in the lower front of the electrical equipment 50 is 0.09 PU. Note that measurement points 20, 21, and 22 are inside the front door 1 provided on the front side of the housing 15, and are measured outside the protective plate 3a located on the front side.
[0016] Furthermore, the measurement point 23 at the lower center in the front-to-back direction of the electrical equipment 50 is 0.18 PU, and the measurement point 24 at the lower rear surface of the electrical equipment 50 is 0.13 PU. Note that measurement point 24 is the area of the live part 4c, which is inside the protective plate 3b located on the rear side. From the example shown in Figure 3, it can be seen that the temperature in the housing 15 of the electrical equipment 50 increases from the floor 14 to the ceiling 5. Also, even at the same height, it can be observed that the temperature is higher in the center of the electrical equipment 50, 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 part 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 electrical equipment 50 is inside the housing 15, and the area outside the protective plate 3a has an even lower temperature rise from the ambient temperature. Furthermore, on the rear side, similar to the front side, it can be inferred that the temperature rise from the ambient temperature is even lower on the inside of the housing 15 but outside the protective plate 3b than on the area of the charging section 4c which is inside the protective plate 3b.
[0017] In the electrical equipment 50 according to Embodiment 1, as shown in Figure 1A, the sensor or camera 7, the signal processing device 8, the communication terminal 9, and the power supply 10 for these devices are arranged in the space between the front door 1 and the protective plate 3a on the front side of the housing 15. The sensor or camera 7 and the signal processing device 8 are also arranged in the space between the rear door 2 and the protective plate 3b on the rear side of the housing 15. In the electrical equipment 50 according to Embodiment 1, a partitioned wiring duct 13 is arranged in the front-to-back direction of the housing 15, between the protective plate 3a on the front side of the housing 15 and the protective plate 3b on the rear side. As shown in Figure 1B, this wiring duct 13 is arranged at the lower right corner and the lower left corner of the floor portion 14 of the housing 15, respectively. Considering the temperature inside the housing 15, it is preferable that the wiring duct 13 be arranged at the corners of the floor portion 14 of the housing 15. However, the wiring duct 13 only needs to be arranged at any of the four corners of the housing 15 when viewed from the front of the housing 15, and may be provided at multiple corners.
[0018] As shown in Figure 1C, the partitioned wiring duct 13 is made of metal, for example, and is grounded. The inside of the wiring duct 13 is hollow. The wiring duct 13 is provided in the front-to-back 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 it may be closed with a metal cover, for example. The power lines 11 and communication lines 12 of the sensor or camera 7 and the 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 Embodiment 1, by installing the monitoring equipment 30 of the sensor or camera 7, signal processing device 8, communication terminal 9, and power supply 10 in a location within the electrical equipment 50 where the temperature rise is low, it is possible to suppress thermal effects and deterioration over time of these devices.
[0019] As described above, power lines 11 for connecting the sensor or camera 7, signal processing device 8, and communication terminal 9 to the power supply 10, and communication lines 12 for connecting the sensor or camera 7, signal processing device 8, and communication terminal 9 are wired inside the wiring duct 13. In addition, the power lines 11 for connecting the sensor or camera 7, signal processing device 8, and communication terminal 9 to the power supply 10 and the communication lines 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 in the floor section 14 and the area outside the protective plates 3a and 3b inside the housing 15 are isolated from the high-voltage charging section 4c. Therefore, in the electrical equipment 50 according to Embodiment 1, the influence of electromagnetic waves from the main circuit equipment 4a to the communication line 12 can be suppressed, as can the influence of electromagnetic waves from the power line 11 and the communication line 12 to the signal of the main circuit equipment 4a. The sensors include, for example, a temperature sensor for measuring temperature, a humidity sensor for measuring relative humidity, a dust sensor for measuring particles such as PM2.5, a partial discharge sensor for detecting partial discharge which is an indication of insulation deterioration, and a microphone for measuring sound. The sensor or camera 7 detects the state inside the housing 15 as a signal. The signal processing device 8 is a filter that extracts only signals with frequencies in a specific band, such as a few kHz to 100 kHz, from a partial discharge sensor, for example. The signal processing device 8 analyzes, processes, and interprets the signal information from the sensor or camera 7. The communication terminal 9 is, for example, a Wi-Fi router and is a communication device for transmitting signals from the sensor or camera 7 to the outside.
[0021] Figure 2 is a side view showing a modified example of the electrical equipment according to Embodiment 1. As shown in Figure 2, for example, by arranging the heat-sensitive sensor or camera 7 and signal processing device 8 closer to the floor 14 than to the center of the housing 15, the effect of temperature rise inside the housing 15 can be further suppressed. Figure 4 is a block diagram showing an example of the configuration of equipment for monitoring the internal state of the electrical equipment according to Embodiment 1. As shown in Figure 4, the monitoring equipment 30 for monitoring the internal state of the electrical equipment 50 includes a sensor or camera 7 for detecting abnormalities inside the housing 15, a signal processing device 8 for processing signals from the sensor or camera 7, a communication terminal 9 for transmitting signals from the sensor or camera 7 to the outside, and a power supply 10 for supplying electricity to these devices, and these are housed inside the electrical equipment 50.
[0022] Note that the configuration of the monitoring device 30 for monitoring the internal state shown in Figure 4 is an example and is not limited to the arrangement shown in Figure 4. Different sensors may be installed than those shown in Figure 4, and in cases where signal processing is not performed, the communication terminal 9 is placed outside the electrical equipment 50, or the communication line 12 and power line 11 are shared by a single line. Furthermore, the monitoring device 30 may not include the power supply 10. Also, the arrangement of sensors or cameras 7, etc., in the electrical equipment 50 shown in Figures 1A and 2 is an example and is not limited to the arrangement shown in Figures 1A and 2. For example, the sensors or cameras 7 and signal processing device 8 may be arranged only on the front side or only on the rear side. Furthermore, the electrical equipment 50 may have a different shape than those shown in Figures 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 out the main circuit in order to remove or replace the sensor or camera. In the electrical equipment 50 according to Embodiment 1, the power supply 10 for the monitoring equipment 30 that monitors the internal state of the sensor or camera 7, signal processing device 8, communication terminal 9, etc., and the main power supply 28 for the main circuit are provided as separate power supplies. Also, in the electrical equipment 50 according to Embodiment 1, as described above, the power 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 the wiring duct 13. In addition, the sensor or camera 7, signal processing device 8, communication terminal 9, and the power supply 10 for these devices are mounted in the space between the front door 1 and the protective plate 3a on the front side of the housing 15. The sensor or camera 7 and signal processing device 8 are mounted in the space between the rear door 2 and the protective plate 3b on the rear side of the housing 15.
[0024] This allows for easy replacement of a monitoring device 30 that monitors the internal state of a sensor or camera 7, without causing a power outage to the main circuit unit 4 and without touching the live part 4c, even if the monitoring device 30 fails. Furthermore, when removing the power line 11 or communication line 12, the installation or removal of the power line 11 and communication line 12 can be done without touching the live part 4c. For example, in the case of a camera, a failure can be identified by the criterion that the image will no longer be displayed. In the case of a temperature sensor, a failure can be determined if the communication of temperature and humidity data is interrupted, or if the measurement of clearly abnormal temperatures, such as 200°C or -50°C, continues.
[0025] If the monitoring device 30, which monitors the internal state of a sensor or camera 7, 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, with the possibility of contact with the live part 4c low due to the protective plate 3a or 3b, the power line 11 and communication line 12 are removed from the sensor or camera 7 and signal processing device 8. Furthermore, the power line 11 and communication line 12 are pulled out from the outside of the protective plate 3a or 3b and replaced. As described above, if the sensor or camera 7, etc., is determined to be faulty, the replacement procedure is carried out according to the above steps. It goes without saying that if there is a risk of contact with the live part 4c during replacement even with this measure alone, it is necessary to power off the main circuit device 4 for safety reasons, even if the power supply 10 is separated from the main power supply 28.
[0026] As described above, the electrical equipment 50 according to Embodiment 1 comprises a housing 15, a main circuit device 4 arranged inside the housing 15 and having a main circuit device 4a and an electrical circuit 4b, protective plates 3a and 3b provided between the housing 15 and the live part 4c so as to cover the live part 4c of the main circuit device 4, monitoring equipment 30 provided between the housing 15 and the protective plates 3a and 3b to monitor the inside of the housing 15, and a wiring duct 13 provided isolated from the live part 4c of the main circuit device 4, with the power line 11 and communication line 12 of the monitoring equipment 30 provided in the wiring duct 13 so as to penetrate the inside of the wiring duct 13. Furthermore, according to the electrical equipment 50 according to Embodiment 1, only the power line 11 and communication line 12 of the monitoring equipment 30 are wired inside the wiring duct 13.
[0027] Furthermore, according to the electrical equipment 50 of Embodiment 1, the monitoring device 30 includes a sensor or camera 7 for detecting abnormalities inside the housing 15. Also, according to the electrical equipment 50 of Embodiment 1, the monitoring device 30 includes a signal processing device 8 for processing signals from the sensor or camera 7. Furthermore, according to the electrical equipment 50 of Embodiment 1, the monitoring device 30 includes a communication terminal 9 for communicating with the outside, and the signals are transmitted to the outside of the housing 15 via the communication terminal 9. Also, according to the electrical equipment 50 of Embodiment 1, 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, according to the electrical equipment 50 of Embodiment 1, the wiring duct 13 is made of metal and is grounded. In addition, according to the electrical equipment 50 of Embodiment 1, protective plates 3a and 3b are provided between the front side of the housing 15 and the charging part 4c, and between the rear side of the housing 15 and the charging part 4c, respectively, and the wiring duct 13 is provided in the front-rear direction along the side of the housing 15 from protective plate 3a provided on the front side of the housing 15 to protective plate 3b provided on the rear side. Furthermore, according to the electrical equipment 50 of Embodiment 1, the wiring duct 13 is provided at the corner of the housing 15.
[0029] According to the electrical equipment 50 of Embodiment 1, the influence of electromagnetic waves generated by the power lines 11 and communication lines 12 of the monitoring equipment 30 on the signal of the main circuit equipment 4a can be suppressed. Furthermore, the generation of noise in the communication lines 12 of the monitoring equipment 30 due to electromagnetic waves generated from the main circuit equipment 4a of the electrical equipment 50 can be suppressed. In addition, in the electrical equipment 50, the monitoring equipment 30 such as sensors or cameras 7 is placed in a location where the temperature rise is relatively small in addition to the ambient temperature of the electrical equipment 50, so the deterioration of the monitoring equipment 30 over time can be suppressed, and as a result the reliability of the electrical equipment 50 can be improved. Furthermore, power outages of the main circuit device 4 can be avoided when replacing the monitoring equipment 30 such as sensors or cameras 7. Thus, in the electrical equipment 50 of Embodiment 1, the reliability and efficiency of the electrical equipment 50 can be improved.
[0030] Embodiment 2. Figure 5A is a side view showing the electrical equipment according to Embodiment 2, and Figure 5B is a side view showing a modified version of the electrical equipment according to Embodiment 2. Figure 6 is a view taken along the line B-B of the electrical equipment shown in Figure 5A. In Figures 5A, 5B, and 6, components with the same reference numerals as those used to describe the electrical equipment 50 according to Embodiment 1 indicate the same or corresponding components, and their explanation is omitted.
[0031] The following describes the electrical equipment 50 according to Embodiment 2, focusing on the differences from Embodiment 1. As shown in Figures 5A, 5B, and 6, the electrical equipment 50 according to Embodiment 2 has a storage compartment 25 partitioned in the floor portion 14 inside the front door 1, and the communication terminal 9 and power supply 10 are housed inside the storage compartment 25. The storage compartment 25 is, for example, a metal housing and is located between the front door 1 and the protective plate 3a, which are provided on the front side of the housing 15. As a result, the electrical equipment 50 according to Embodiment 2 can suppress the impact on the equipment and wiring of the electrical equipment 50 more than in Embodiment 1.
[0032] In the electrical equipment 50 according to Embodiment 2, as shown in Figure 5A, the sensor or camera 7 and the signal processing device 8 are arranged between the rear door 2 and the protective plate 3b, which are provided on the rear side of the housing 15. The sensor or camera 7 and the signal processing device 8 are mounted on the upper rear section of the housing 15. Figure 5B is a side view showing a modified example of the electrical equipment according to Embodiment 2. As shown in Figure 5B, for example, in the case of a heat-sensitive sensor or camera 7 and signal processing device 8, the effect of temperature rise inside the housing 15 can be further suppressed by arranging the sensor or camera 7 and signal processing device 8 closer to the floor 14 than to the center of the housing 15.
[0033] As described above, in the electrical equipment 50 according to Embodiment 2, a storage compartment 25 is provided in the floor portion 14 of the housing 15 between the housing 15 and the protective plate 3a, and the power supply 10 and the communication terminal 9 are housed in the storage compartment 25. As a result, the electrical equipment 50 according to Embodiment 2 can further improve the reliability of the electrical equipment 50. The electrical equipment 50 according to Embodiments 1 and 2 relates to, for example, a high-voltage switchgear or distribution board having monitoring equipment 30 such as sensors for detecting abnormalities within the electrical equipment 50.
[0034] While this disclosure describes various exemplary embodiments and examples, the various features, aspects, and functions described in one or more embodiments are not limited to the application of a particular embodiment, but are applicable individually or in various combinations to the embodiments. Accordingly, countless variations not illustrated are envisioned within the scope of the art disclosed in this specification. For example, these include modifying, adding or omitting at least one component, or extracting at least one component and combining it with a component from another embodiment.
[0035] 1 Front door, 2 Rear door, 3a, 3b Protective plate, 4 Main circuit unit, 4a Main circuit equipment, 4b Electrical circuit, 4c Charging section, 5 Ceiling section, 6 Upper section, 7 Sensor or camera, 8 Signal processing unit, 9 Communication terminal, 10 Power supply, 11 Power line, 12 Communication line, 13 Wiring duct, 14 Floor section, 15 Enclosure, 16, 17, 18, 19, 20, 21, 22, 23, 24 Measurement point, 25 Storage section, 26 Cable, 27 Terminal, 28 Main power supply, 30 Monitoring equipment, 50 Electrical equipment
Claims
1. Electrical equipment comprising: a housing; a main circuit device disposed within the housing and having a main circuit device and an electrical circuit; a protective plate provided between the housing and the charging part so as to cover the charging part of the main circuit device; a monitoring device provided between the housing and the protective plate for monitoring the inside of the housing; and a wiring duct provided separately from the charging part of the main circuit device, wherein the wiring duct is provided with power lines for the monitoring device and communication lines for the monitoring device so as to penetrate the inside of the wiring duct.
2. The electrical equipment according to claim 1, wherein only the power lines and communication lines of the monitoring equipment are wired inside the wiring duct.
3. The electrical equipment according to claim 1 or 2, wherein the monitoring equipment includes a sensor or camera for detecting an abnormality inside the housing.
4. The electrical equipment according to claim 3, wherein the monitoring equipment includes a signal processing device for processing signals from the sensor or camera.
5. The electrical equipment according to claim 4, wherein the monitoring device includes a communication terminal for communicating with the outside, and the signal is transmitted to the outside of the housing via the communication terminal.
6. The electrical equipment according to claim 5, wherein the monitoring equipment includes a power supply that supplies electricity to the sensor or camera, the signal processing device, and the communication terminal via the power line, and the power supply is provided separately from the main power supply of the main circuit device.
7. The electrical equipment according to claim 6, wherein a storage compartment is provided in the floor portion of the housing between the housing and the protective plate, and the power supply and the communication terminal are housed in the storage compartment.
8. The electrical equipment according to any one of claims 1 to 7, wherein the wiring duct is made of metal and is grounded.
9. The electrical equipment according to any one of claims 1 to 8, wherein the protective plate is provided between the front side of the housing and the charging unit and between the rear side of the housing and the charging unit, 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.
10. The electrical equipment according to any one of claims 1 to 9, wherein the wiring duct is provided at the corner of the housing.