Backflow cable state monitoring and early warning device with pincerlike monitoring sensor

Abstract

The utility model discloses a backflow cable state monitoring and early warning device with a pincer-shaped monitoring sensor, which belongs to the field of high-voltage power cables and comprises a monitoring sensor and a monitoring processing assembly, the monitoring sensor comprises a first pincer body and a second pincer body which are hinged with each other, the first pincer body comprises a first clamping part, the second pincer body comprises a second clamping part, and the first pincer body and the second pincer body are hinged with each other. One end of the first clamping part and one end of the second clamping part are both close to a hinge point of the first clamp body and the second clamp body, and when the monitoring sensor is in a clamping state, the other end of the first clamping part and the other end of the second clamping part are close to each other; when the monitoring sensor is in an open state, the other end of the first clamping part and the other end of the second clamping part are far away from each other, the monitoring processing assembly comprises a controller, a collector and an alarm, the collector is used for collecting monitoring information of the monitoring sensor, and the controller is configured to control the alarm to give an alarm based on the monitoring information obtained by the collector. Installation is convenient, and the risk that the backflow cable is stolen can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of high-voltage power cable technology, and in particular to a return cable status monitoring and early warning device with clamp-type monitoring sensor. Background Technology

[0002] High-voltage power cables of 35kV and above often use segmented grounding for their metal sheaths. For segmented grounding, the return cable provides an important path for ground fault current and is an important component for protecting the line operation. Since the return cable is not energized under normal circumstances and does not affect the line operation, it has become a target for theft. After the return cable is stolen, the line impact can easily cause the sheath voltage to rise to thousands or even tens of thousands of volts, causing insulation damage, protector breakdown, sheath grounding and other problems, which greatly troubles the operation and maintenance work of the staff.

[0003] Patent application number 201820998107.3 discloses a return cable anti-theft device with good anti-theft effect, including anti-theft screws and anti-theft clamps for fixing the return cable. Multiple anti-theft screws and clamps are provided and spaced apart. The device also includes a vibration sensor, a data acquisition unit, and an alarm connected to the anti-theft screws and clamps. The vibration sensor collects vibration signals from the return cable and / or the anti-theft screws and / or clamps. The vibration sensor is located at the interface between the anti-theft screw or clamp and the return cable. The data acquisition unit acquires the vibration signals collected by the vibration sensor and transmits them to the alarm. The alarm includes an acquisition unit and a processing unit. The acquisition unit acquires the vibration signals transmitted by the data acquisition unit, and the processing unit determines whether the return cable has been stolen based on the vibration signals acquired by the acquisition unit and triggers an alarm based on the determination result. This method requires the use of anti-theft screws and clamps to install the sensor, involves many components, and has a complex installation process. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a return cable status monitoring and early warning device with a clamp-shaped monitoring sensor. Using the clamp-shaped detection sensor, it is only necessary to open the first clamp and the second clamp, insert the return cable between the first clamping part and the second clamping part, and then close the first clamp and the second clamp to clamp the return cable. The installation is convenient and the device can be installed without power interruption.

[0005] A return cable status monitoring and early warning device with a clamp-on monitoring sensor according to an embodiment of the present invention includes:

[0006] A monitoring sensor includes a first clamp and a second clamp hinged together. The first clamp includes a first gripping portion, and the second clamp includes a second gripping portion. One end of the first gripping portion and one end of the second gripping portion are both close to the hinge point of the first clamp and the second clamp. The monitoring sensor has a clamped state and an open state. When the monitoring sensor is in the clamped state, the other ends of the first clamp and the second clamp are close to each other; when the monitoring sensor is in the open state, the other ends of the first clamp and the second clamp are far apart.

[0007] A monitoring and processing component includes a controller, a data acquisition unit, and an alarm. The controller is electrically connected to the data acquisition unit and the alarm. The data acquisition unit is electrically connected to the monitoring sensor. The data acquisition unit is used to collect monitoring information from the monitoring sensor. The controller is configured to control the alarm to issue an alarm based on the monitoring information acquired by the data acquisition unit.

[0008] A return cable status monitoring and early warning device with a clamp-on monitoring sensor according to an embodiment of the present invention has at least the following beneficial effects:

[0009] The monitoring sensor monitors the return cable, and the data acquisition unit collects the monitoring information from the sensor. The controller, based on the information acquired by the data acquisition unit, controls the alarm to issue an alarm. Using a clamp-type detection sensor, installation is simple: open the first and second clamps, insert the return cable between the first and second clamping parts, and then close the clamps to hold the cable. Installation is convenient and the device can be added without power interruption. Real-time monitoring of the return cable reduces the risk of theft.

[0010] According to some embodiments of the present invention, the first clamp body includes a first handle portion, and the second clamp body includes a second handle portion. One end of the first handle portion and one end of the second handle portion are both close to the hinge point of the first clamp body and the second clamp body. When the monitoring sensor is in the clamping state, the other end of the first handle portion and the other end of the second handle portion are far apart from each other; when the monitoring sensor is in the open state, the other end of the first handle portion and the other end of the second handle portion are close together.

[0011] According to some embodiments of the present invention, the first handle portion is provided with a first clamping groove for the return cable to be inserted, and the second handle portion is provided with a second clamping groove for the return cable to be inserted, with the first clamping groove and the second clamping groove being disposed opposite to each other.

[0012] According to some embodiments of the present invention, a first wear-resistant pad is provided on the inner wall of the first clamping groove, and a second wear-resistant pad is provided on the inner wall of the second clamping groove.

[0013] According to some embodiments of the present invention, the monitoring sensor further includes an elastic element, which connects the first clamping body and the second clamping body. The elastic element is used to drive the other end of the first clamping part and the other end of the second clamping part to move closer to each other.

[0014] According to some embodiments of the present invention, the elastic element includes a torsion spring, which is disposed at the hinge of the first clamp body and the second clamp body.

[0015] According to some embodiments of this utility model, the monitoring sensor is internally provided with a voltage coupling coil and a current coupling coil. The monitoring processing component is connected to the monitoring sensor via a connecting cable. The monitoring processing component also includes a signal output module. The controller is electrically connected to the signal output module, and the signal output module is electrically connected to the voltage coupling coil. The signal output module is used to input an excitation voltage signal to the voltage coupling coil. The voltage coupling coil is used to couple the excitation voltage signal to the return cable. The data acquisition unit is electrically connected to the current coupling coil, and the current coupling coil is used to acquire the excitation current of the return cable and transmit it to the data acquisition unit.

[0016] According to some embodiments of the present invention, the monitoring sensor is further provided with an open circuit protection module, an overvoltage protection module and a grounding wire. The open circuit protection module is connected in parallel to the secondary output terminals of the voltage coupling coil and the current coupling coil. One end of the overvoltage protection module is connected to the secondary output terminals of the voltage coupling coil and the current coupling coil, and the other end of the overvoltage protection module is grounded.

[0017] According to some embodiments of the present invention, the monitoring and processing component further includes a packaging box, a display screen, a power supply module, and a communication module. The display screen, the power supply module, and the communication module are all electrically connected to the controller. The communication module is used to report the monitored return cable status to the monitoring platform. The display screen is mounted on the packaging box, and the power supply module, the communication module, the controller, and the signal output module are all installed inside the packaging box.

[0018] According to some embodiments of the present invention, the alarm includes a switch output module and an audible and visual alarm module. Both the switch output module and the audible and visual alarm module are electrically connected to the controller. The switch output module is used to output switch quantity changes, and the audible and visual alarm module is used to output audible and visual alarms.

[0019] Additional aspects and advantages of this invention will be set forth in part in the description which follows. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0021] Figure 1 This is a schematic diagram of the structure of the return cable status monitoring and early warning device with clamp-on monitoring sensor according to an embodiment of the present invention;

[0022] Figure 2 This is a structural block diagram of the return cable status monitoring and early warning device with clamp-on monitoring sensor according to an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the structure of the monitoring sensor in the return cable status monitoring and early warning device with clamp-on monitoring sensor according to an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the installation of the monitoring sensor in the return cable status monitoring and early warning device with clamp-on monitoring sensor according to an embodiment of this utility model.

[0025] Icon labels:

[0026] 100. Monitoring sensor; 110. First clamp body; 111. First clamping part; 1111. First clamping groove; 1112. First wear-resistant pad; 112. First handle part; 120. Second clamp body; 121. Second clamping part; 1211. Second clamping groove; 1212. Second wear-resistant pad; 122. Second handle part; 130. Elastic element; 140. Voltage coupling coil; 150. Current coupling coil; 160. Open circuit protection module; 170. Overvoltage protection module;

[0027] 200. Monitoring and processing components; 210. Controller; 220. Data acquisition unit; 230. Alarm device; 231. Switch output module; 232. Audible and visual alarm module; 240. Signal output module; 250. Encapsulation box; 260. Display screen; 270. Power supply module; 280. Communication module;

[0028] 300. Connecting cables. Detailed Implementation

[0029] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0030] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] Please see Figure 1 , Figure 2 and Figure 3 This utility model discloses a return cable status monitoring and early warning device with a clamp-type monitoring sensor, comprising a monitoring sensor 100 and a monitoring processing component 200. The monitoring sensor 100 includes a first clamp 110 and a second clamp 120, which are hinged together. The first clamp 110 includes a first clamping portion 111, and the second clamp 120 includes a second clamping portion 121. One end of the first clamping portion 111 and one end of the second clamping portion 121 are both close to the hinge point of the first clamp 110 and the second clamp 120. The monitoring sensor 100 has a clamped state and an open state. When the monitoring sensor 100 is in the clamped state, the other ends of the first clamping portion 111 and the second clamping portion 121 are close to each other; when the monitoring sensor 100 is in the open state, the other ends of the first clamping portion 111 and the second clamping portion 121 are far apart. The monitoring and processing component 200 includes a controller 210, a data acquisition unit 220, and an alarm 230. The controller 210 is electrically connected to the data acquisition unit 220 and the alarm 230. The data acquisition unit 220 is electrically connected to the monitoring sensor 100. The data acquisition unit 220 is used to collect the monitoring information of the monitoring sensor 100. The controller 210 can control the alarm 230 to issue an alarm based on the monitoring information obtained by the data acquisition unit 220.

[0033] The monitoring sensor 100 monitors the return cable, and the data acquisition unit 220 collects the monitoring information from the monitoring sensor 100. The controller 210, based on the monitoring information acquired by the data acquisition unit 220, controls the alarm 230 to issue an alarm. Using a clamp-type detection sensor, installation is simple: open the first clamp 110 and the second clamp 120, insert the return cable between the first clamping part 111 and the second clamping part 121, and then close the first clamp 110 and the second clamp 120 to clamp the return cable. Installation is convenient and the device can be added without power interruption. Real-time monitoring of the return cable reduces the risk of theft.

[0034] In some embodiments, see Figure 1 , Figure 3 and Figure 4 The first clamp 110 includes a first handle portion 112, and the second clamp 120 includes a second handle portion 122. One end of the first handle portion 112 and one end of the second handle portion 122 are both close to the hinge point of the first clamp 110 and the second clamp 120. When the monitoring sensor 100 is in the clamping state, the other ends of the first handle portion 112 and the second handle portion 122 are far apart; when the monitoring sensor 100 is in the open state, the other ends of the first handle portion 112 and the second handle portion 122 are close together.

[0035] The system provides a first handle 112 and a second handle 122 for easy gripping by operators. Squeezing the first and second handles brings their ends closer together, opening the monitoring sensor 100. Conversely, pulling the first clamping part 111 and the second clamping part 121 away from each other allows the return cable to be inserted between them. Pulling the first and second handles 112 away moves their ends further apart, clamping the monitoring sensor 100. The ends of the first and second clamping parts 111 and 121 then bring them closer together, allowing them to clamp the return cable.

[0036] In some embodiments, see Figure 1 and Figure 3The first handle portion 112 is provided with a first clamping groove 1111 for the return cable to extend into. The second handle portion 122 is provided with a second clamping groove 1211 for the return cable to extend into. The first clamping groove 1111 and the second clamping groove 1211 are arranged opposite to each other. Both the first clamping groove 1111 and the second clamping groove 1211 are arc-shaped grooves. The provision of the first clamping groove 1111 and the second clamping groove 1211 ensures that after the first clamping portion 111 and the second clamping portion 121 clamp the return cable, the return cable will not slip out from between the first clamping portion 111 and the second clamping portion 121.

[0037] In some embodiments, see Figure 1 and Figure 3 A first wear-resistant pad 1112 is provided on the inner wall of the first clamping groove 1111, and a second wear-resistant pad 1212 is provided on the inner wall of the second clamping groove 1211. When the monitoring sensor 100 is clamped on the return cable, the first wear-resistant pad 1112 and the second wear-resistant pad 1212 abut against the return cable, which can increase the friction between the monitoring sensor 100 and the return cable, ensuring that the monitoring sensor 100 is clamped in the designated position on the return cable and is not easy to slip on the return cable.

[0038] In some embodiments, see Figure 1 and Figure 3 The monitoring sensor 100 also includes an elastic element 130, which connects the first clamping body 110 and the second clamping body 120. The elastic element 130 is used to drive the other end of the first clamping part 111 and the other end of the second clamping part 121 closer together. By setting the elastic element 130, the first clamping part 111 and the second clamping part 121 are ensured to be in the clamping state in their initial positions, ensuring the clamping force of the first clamping part 111 and the second clamping part 121 on the return cable, and preventing the monitoring sensor 100 from falling off the return cable.

[0039] In some embodiments, see Figure 1 and Figure 3 The elastic element 130 includes a torsion spring, which is located at the hinge of the first clamping body 110 and the second clamping body 120. By providing the torsion spring, the first clamping part 111 and the second clamping part 121 are kept in the clamping state in their initial positions, ensuring the clamping force of the first clamping part 111 and the second clamping part 121 on the return cable, and preventing the monitoring sensor 100 from falling off the return cable.

[0040] In some embodiments, see Figure 1 and Figure 2The monitoring sensor 100 internally includes a voltage coupling coil 140 and a current coupling coil 150. The monitoring processing component 200 is connected to the monitoring sensor 100 via a connecting cable 300. The monitoring processing component 200 also includes a signal output module 240. The controller 210 is electrically connected to the signal output module 240, which is also electrically connected to the voltage coupling coil 140. The signal output module 240 is used to input an excitation voltage signal to the voltage coupling coil 140, which is used to couple the excitation voltage signal to the return cable. The data acquisition unit 220 is electrically connected to the current coupling coil 150, which is used to acquire the excitation current of the return cable and transmit it to the data acquisition unit 220.

[0041] The controller 210 controls the signal output module 240 to output an excitation voltage signal with a fixed frequency and amplitude, which is transmitted to the voltage coupling coil 140 in the monitoring sensor 100 via the connecting cable 300. The voltage coupling coil 140 couples the excitation voltage to the monitored return cable using electromagnetic coupling, generating an excitation current in the return cable. This excitation current in the return cable is also collected by the current coupling coil 150 using electromagnetic coupling and transmitted to the data acquisition unit 220 via the connecting cable 300. The controller 210 processes the voltage value output by the signal output module 240 and the current value obtained by the data acquisition unit 220 to obtain the resistance value of the loop formed between the return cable and the ground.

[0042] When the return cable is in normal condition, the resistance value obtained after analysis and calculation should be within 10Ω. When the resistance value exceeds 10Ω, it indicates that there may be an unreliable defect in the connection between the return cable and the ground, or that the return cable has been stolen or cut, causing a short circuit between the return cable and the ground.

[0043] If the measured resistance exceeds the standard, it may indicate that the connection is unreliable or the return cable has been stolen. The controller 210 will control the alarm 230 to issue an alarm.

[0044] The device effectively avoids problems such as insulation damage, protector breakdown, and sheath grounding caused by excessive sheath voltage due to line impact after the return cable is stolen. It effectively reduces the operation and maintenance pressure of staff and improves the digitalization and intelligence level of transmission line operation and maintenance.

[0045] In some embodiments, see Figure 1 and Figure 2The monitoring sensor 100 also includes an open-circuit protection module 160, an overvoltage protection module 170, and a grounding wire. The open-circuit protection module 160 is connected in parallel to the secondary output terminals of the voltage coupling coil 140 and the current coupling coil 150 to prevent excessive open-circuit voltage from injuring people when the connecting cable 300 between the monitoring sensor 100 and the monitoring processing component 200 is disconnected. One end of the overvoltage protection module 170 is connected to the secondary output terminals of the voltage coupling coil 140 and the current coupling coil 150, and the other end is connected to the grounding wire. The grounding wire is grounded to prevent the induced overvoltage generated on the coil from damaging the monitoring processing component 200 when an overvoltage occurs on the return cable during a line fault.

[0046] The device can effectively prevent high-voltage cable insulation damage, protector breakdown, and sheath grounding caused by line impact due to the theft of the return cable. It effectively reduces the operation and maintenance pressure of staff and improves the digitalization and intelligence level of transmission line operation and maintenance.

[0047] In some embodiments, see Figure 1 and Figure 2 The monitoring and processing component 200 also includes a housing 250, a display screen 260, a power module 270, and a communication module 280. The display screen 260, power module 270, and communication module 280 are all electrically connected to the controller 210. The communication module 280 is used to report the status of the monitored return cable to the monitoring platform. The display screen 260 is mounted on the housing 250. The power module 270, communication module 280, controller 210, data acquisition unit 220, alarm 230, and signal output module 240 are all installed inside the housing 250.

[0048] If the measured resistance exceeds the standard, it may indicate an unreliable connection or that the return cable has been stolen or cut. The controller 210 will then activate the alarm 230 to issue an alert. Simultaneously, the measured resistance value and alarm status will be wirelessly transmitted to the monitoring platform via the communication module 280 to alert maintenance personnel.

[0049] In some embodiments, see Figure 1 and Figure 2 The alarm 230 includes a switch output module 231 and an audible and visual alarm module 232. Both the switch output module 231 and the audible and visual alarm module 232 are electrically connected to the controller 210. The switch output module 231 is used to output switch quantity changes, and the audible and visual alarm module 232 is used to output audible and visual alarms. The controller 210 is connected to the switch output module 231 and the audible and visual alarm module 232. When the return cable is loosely connected to the grounding grid or stolen, a warning is issued through switch quantity changes and audible and visual alarms.

[0050] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0051] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A return cable status monitoring and early warning device with a clamp-on monitoring sensor, characterized in that, include: A monitoring sensor includes a first clamp and a second clamp hinged together. The first clamp includes a first gripping portion, and the second clamp includes a second gripping portion. One end of the first gripping portion and one end of the second gripping portion are both close to the hinge point of the first clamp and the second clamp. The monitoring sensor has a clamped state and an open state. When the monitoring sensor is in the clamped state, the other ends of the first clamp and the second clamp are close to each other; when the monitoring sensor is in the open state, the other ends of the first clamp and the second clamp are far apart. A monitoring and processing component includes a controller, a data acquisition unit, and an alarm. The controller is electrically connected to the data acquisition unit and the alarm. The data acquisition unit is electrically connected to the monitoring sensor. The data acquisition unit is used to collect monitoring information from the monitoring sensor. The controller is configured to control the alarm to issue an alarm based on the monitoring information acquired by the data acquisition unit.

2. The return cable status monitoring and early warning device with clamp-on monitoring sensor according to claim 1, characterized in that, The first clamp body includes a first handle portion, and the second clamp body includes a second handle portion. One end of the first handle portion and one end of the second handle portion are both close to the hinge point of the first clamp body and the second clamp body. When the monitoring sensor is in the clamping state, the other end of the first handle portion and the other end of the second handle portion are far apart from each other; when the monitoring sensor is in the open state, the other end of the first handle portion and the other end of the second handle portion are close together.

3. The return cable status monitoring and early warning device with clamp-on monitoring sensor according to claim 2, characterized in that, The first handle portion is provided with a first clamping groove for the return cable to be inserted, and the second handle portion is provided with a second clamping groove for the return cable to be inserted, with the first clamping groove and the second clamping groove being arranged opposite to each other.

4. The return cable status monitoring and early warning device with clamp-on monitoring sensor according to claim 3, characterized in that, A first wear-resistant pad is provided on the inner wall of the first clamping groove, and a second wear-resistant pad is provided on the inner wall of the second clamping groove.

5. The return cable status monitoring and early warning device with clamp-on monitoring sensor according to claim 1, characterized in that, The monitoring sensor also includes an elastic element that connects the first clamp and the second clamp. The elastic element is used to drive the other end of the first clamp and the other end of the second clamp closer to each other.

6. A return cable status monitoring and early warning device with a clamp-on monitoring sensor according to claim 5, characterized in that, The elastic element includes a torsion spring, which is located at the hinge of the first clamp and the second clamp.

7. The return cable status monitoring and early warning device with clamp-on monitoring sensor according to claim 1, characterized in that, The monitoring sensor is internally equipped with a voltage coupling coil and a current coupling coil. The monitoring processing component is connected to the monitoring sensor via a connecting cable. The monitoring processing component also includes a signal output module. The controller is electrically connected to the signal output module, and the signal output module is electrically connected to the voltage coupling coil. The signal output module is used to input an excitation voltage signal to the voltage coupling coil. The voltage coupling coil is used to couple the excitation voltage signal to the return cable. The data acquisition unit is electrically connected to the current coupling coil, and the current coupling coil is used to acquire the excitation current of the return cable and transmit it to the data acquisition unit.

8. A return cable status monitoring and early warning device with clamp-on monitoring sensor according to claim 7, characterized in that, The monitoring sensor is also equipped with an open circuit protection module and an overvoltage protection module. The open circuit protection module is connected in parallel to the secondary output terminals of the voltage coupling coil and the current coupling coil. One end of the overvoltage protection module is connected to the secondary output terminals of the voltage coupling coil and the current coupling coil, and the other end of the overvoltage protection module is grounded.

9. A return cable status monitoring and early warning device with clamp-on monitoring sensor according to claim 7, characterized in that, The monitoring and processing component further includes a packaging box, a display screen, a power supply module, and a communication module. The display screen, the power supply module, and the communication module are all electrically connected to the controller. The communication module is used to report the monitored return cable status to the monitoring platform. The display screen is mounted on the packaging box, and the power supply module, the communication module, the controller, and the signal output module are all installed inside the packaging box.

10. A return cable status monitoring and early warning device with a clamp-on monitoring sensor according to claim 1, characterized in that, The alarm includes a switch output module and an audible and visual alarm module. Both the switch output module and the audible and visual alarm module are electrically connected to the controller. The switch output module is used to output switch quantity changes, and the audible and visual alarm module is used to output audible and visual alarms.

Images