Joint detection method, device and system for arc protection

Abstract

The invention relates to a joint detection method, device and system for arc protection, the method is applied to the joint detection system, the system comprises a monitoring equipment node and an intelligent switch center node, the method is specifically applied to the intelligent switch center node, and the method comprises the following steps: in any cycle time, the monitoring equipment node is connected with the intelligent switch center node; the intelligent switch center node receives arc monitoring data sent by the monitoring equipment node; in response to an arc existing in the arc monitoring data, alarm information is sent to all the monitoring equipment nodes, and the alarm information comprises a forced detection command; and receiving a detection result returned by the monitoring equipment node in response to the forced detection command, and judging whether an arc occurs or not according to the detection result of each monitoring equipment node and a preset reliability weight.

Description

Technical Field

[0001] The present application relates to the field of arc detection, and in particular to a combined detection method, device and system for arc protection. Background Art

[0002] Arc is a huge safety problem that may exist in power transmission systems. Its triggering cause is mainly the discharge phenomenon caused by the potential difference between the transmission line and other media. According to current research results, arc generation will produce a variety of physical characteristics, such as flash, sound, electromagnetic field, and instantaneous value of transmission current.

[0003] Due to the different characteristics of detection methods, the current detection of arcs basically relies on a single physical detection method. For example, light detection usually uses a camera image processing system, sound detection usually uses vibration detection, and current detection uses power line power detection technology. The integration of detection information requires additional communication units, such as setting up antennas or adding communication lines. In addition, a single physical detection method may have false detection problems. Usually, active power-off is used to protect arc detection, but once a false detection occurs, it will cause power outages for users without reason. At present, the main method of judging whether there is a false detection is repeated confirmation, which is slow in preventing risks.

[0004] The accuracy and detection efficiency of existing arc detection methods still need to be improved. Summary of the invention

[0005] The embodiments of the present application provide a combined detection method, device and system for arc protection, so as to at least solve the problems of poor accuracy and detection efficiency of existing arc detection methods in the related art.

[0006] In a first aspect, an embodiment of the present application provides a joint detection method for arc protection, the method is applied to a joint detection system, the system includes a monitoring device node and an intelligent switch center node, the method is specifically applied to the intelligent switch center node, the method includes:

[0007] In any cycle time, the intelligent switch central node receives the arc monitoring data sent by the monitoring device node;

[0008] In response to the presence of an arc in the arc monitoring data, sending an alarm message to all the monitoring device nodes, wherein the alarm message includes a forced detection command;

[0009] The detection result returned by the monitoring device node in response to the forced detection command is received, and whether an arc occurs is determined according to the detection result of each monitoring device node and a preset reliability weight.

[0010] In one embodiment, the monitoring device node is electrically connected to the intelligent switch center node.

[0011] The power supply and power cut of the monitoring device node by the intelligent switch central node and the data communication between the monitoring device node and the intelligent switch central node are realized through the low-voltage power line high-speed carrier communication mode.

[0012] In one embodiment, the frame structure of the low-voltage power line high-speed carrier communication signal line is defined to include: a time division duplex frame of the intelligent switch center node, a time division duplex frame of the monitoring device node, and a competitive communication frame of each node.

[0013] In one embodiment, the time slot of the monitoring device node in the corresponding time division duplex frame is determined according to the preset priority of the monitoring device node, and all the monitoring device nodes communicate with the intelligent switch central node at least once in the corresponding time slot.

[0014] In one embodiment, the nodes compete for communication frames through a carrier sense multiple access protocol.

[0015] In one embodiment, the intelligent switch central node receives the arc monitoring data sent by the monitoring device node, including:

[0016] Receive arc monitoring data sent by the monitoring device node in a time slot corresponding to the monitoring device node, or in a competitive communication frame of each node.

[0017] In one embodiment, judging whether an arc occurs according to the detection result of each monitoring device node and a preset reliability weight includes:

[0018] Determine an arc detection score according to the detection result of each monitoring device node and the reliability weight of each device node;

[0019] In response to the arc detection score being greater than a preset threshold, determining that an arc has occurred;

[0020] In response to the arc detection score being less than the preset threshold, it is determined that no arc occurs, and the preset threshold is determined based on the detection result of each monitoring device node.

[0021] In a second aspect, an embodiment of the present application provides a joint detection device for arc protection, the device comprising a monitoring device and an intelligent switch, the device being used to implement the joint detection method for arc protection described in the first aspect, the monitoring device being electrically connected to the intelligent switch, and the intelligent switch being used to power on and off the monitoring device, as well as data communication between the monitoring device and the intelligent switch, through a low-voltage power line high-speed carrier communication method.

[0022] The monitoring device is used to obtain arc monitoring data and send the arc monitoring data to the intelligent switch;

[0023] The intelligent switch is used to receive arc monitoring data sent by the monitoring device within a periodic time, and in response to the existence of an arc in the arc monitoring data, send an alarm message to all the monitoring devices, wherein the alarm message includes a forced detection command, receive the detection result returned by the monitoring device in response to the forced detection command, and determine whether an arc occurs based on the detection result of each monitoring device and a preset reliability weight.

[0024] In one example, the frame structure of the low-voltage power line high-speed carrier communication signal line is defined to include: a time division duplex frame of an intelligent switch, a time division duplex frame of a monitoring device node, and a competitive communication frame of each node, wherein the competitive communication frame of each node is implemented through a carrier sense multiple access protocol.

[0025] In a third aspect, an embodiment of the present application provides a joint detection system for arc protection, the system is used to implement the joint detection method for arc protection described in the first aspect, the system includes a monitoring device node and an intelligent switch center node, the monitoring device node is electrically connected to the intelligent switch center node, and the system includes:

[0026] Monitoring module: used for the intelligent switch center node to receive the arc monitoring data sent by the monitoring device node within any period of time;

[0027] A detection module: configured to send an alarm message to all the monitoring device nodes in response to the presence of an arc in the arc monitoring data, wherein the alarm message includes a forced detection command;

[0028] The judgment module is used to receive the detection result returned by the monitoring device node in response to the forced detection command, and judge whether an arc occurs according to the detection result of each monitoring device node and a preset reliability weight.

[0029] The embodiments of the present application provide a combined detection method, device and system for arc protection, which have at least the following technical effects.

[0030] The present application receives the monitoring results of the monitoring equipment through the central node of the intelligent switch, and starts the detection functions of all monitoring equipment when an arc may occur, so as to obtain the detection results of multiple monitoring equipment, thereby comprehensively judging whether an arc occurs based on the reliability weight of each monitoring equipment node and the monitoring results, thereby improving the accuracy and reliability of arc detection. Compared with the prior art, multiple judgments are not required, which improves the efficiency and accuracy of arc detection.

[0031] Details of one or more embodiments of the present application are set forth in the following drawings and description to make other features, objects, and advantages of the present application more readily apparent. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0033] Figure 1 is a flow chart of a joint detection method for arc protection according to an embodiment of the present application;

[0034] Figure 2 is a schematic diagram showing a frame definition method according to an exemplary embodiment;

[0035] Figure 3 It is a structural block diagram of a joint detection device for arc protection shown in an embodiment of the present application;

[0036] Figure 4 is a schematic diagram of a communication topology structure between a smart switch 20 and a monitoring device 10 according to an exemplary embodiment;

[0037] Figure 5 It is a structural block diagram of a joint detection system for arc protection according to an exemplary embodiment. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is described and illustrated below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. Based on the embodiments provided in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0039] Obviously, the drawings described below are only some examples or embodiments of the present application. For ordinary technicians in this field, the present application can also be applied to other similar scenarios based on these drawings without creative work. In addition, it can also be understood that although the efforts made in this development process may be complicated and lengthy, for ordinary technicians in this field related to the content disclosed in this application, some changes in design, manufacturing or production based on the technical content disclosed in this application are just conventional technical means, and should not be understood as insufficient content disclosed in this application.

[0040] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those of ordinary skill in the art that the embodiments described in this application may be combined with other embodiments without conflict.

[0041] Unless otherwise defined, the technical terms or scientific terms involved in this application should be understood by people with ordinary skills in the technical field to which this application belongs. The words "one", "a", "a", "the" and the like involved in this application do not indicate a quantitative limitation, and may represent the singular or plural. The terms "include", "comprise", "have" and any of their variations involved in this application are intended to cover non-exclusive inclusions; for example, a process, method, system, product or device that includes a series of steps or modules (units) is not limited to the listed steps or units, but may also include steps or units that are not listed, or may also include other steps or units inherent to these processes, methods, products or devices. The words "connect", "connected", "coupled" and the like involved in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The "multiple" involved in this application refers to two or more. "And / or" describes the association relationship of associated objects, indicating that there may be three relationships, for example, "A and / or B" can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the objects before and after are in an "or" relationship. The terms "first", "second", "third", etc. involved in this application are only used to distinguish similar objects and do not represent a specific ordering of the objects.

[0042] In a first aspect, an embodiment of the present application provides a joint detection method for arc protection, the method is applied to a joint detection system, the system includes a monitoring device node and an intelligent switch center node, and the method is specifically applied to the intelligent switch center node. Figure 1 is a flow chart of a joint detection method for arc protection according to an embodiment of the present application, such as Figure 1 As shown, the method includes:

[0043] Step S101: within any cycle time, the intelligent switch central node receives arc monitoring data sent by the monitoring device node.

[0044] Optionally, the intelligent switch node receives data from each acquisition cycle of each monitoring device node to determine the possibility of arc occurrence. The number of monitoring device nodes is at least one, and the monitoring device node includes audio monitoring and video monitoring devices. Data communication between the intelligent switch center node and the monitoring device node is achieved through low-voltage power line high-speed carrier communication.

[0045] In one example, the monitoring device node is electrically connected to the intelligent switch center node, and the intelligent switch center node powers on and off the monitoring device node, as well as data communication between the monitoring device node and the intelligent switch center node, through low-voltage power line high-speed carrier communication.

[0046] Optionally, the low-voltage power line high-speed carrier communication method is a communication technology for data transmission on low-voltage power lines. It mainly uses power lines as communication media to achieve data aggregation, transmission and interaction in the power system. It has a strong self-organizing mesh network and supports up to 1024 communication nodes. It is suitable for IoT networks with uncertain installation locations, uncertain communication structures, and limited range (<50m). Therefore, without adding any peripheral equipment, the low-voltage power line high-speed carrier communication method can organize multiple detection devices into the same communication network to comprehensively process arc detection data from multiple monitoring devices and improve the accuracy of arc detection.

[0047] In one example, the frame structure of the low-voltage power line high-speed carrier communication signal line is defined to include: a time division duplex frame of the intelligent switch center node, a time division duplex frame of the monitoring device node, and a competitive communication frame of each node.

[0048] Optionally, Figure 2 is a schematic diagram showing a frame definition method according to an exemplary embodiment. Figure 2 As shown, the frame of the signal line is defined as including the time division duplex frame TDD1 of the intelligent switch center node, the time division duplex frame TDD2 of the monitoring device node, and the communication frame CSMA for each node to compete. Among them, TDDX represents the time division duplex frame fixedly assigned to the Xth node, and CSMA represents the communication time slot that each node competes for. Set the superframe length of the low-voltage power line high-speed carrier communication signal line. In this application, the frame length of TDD is set to the number of monitoring device nodes × 10ms + 10ms, and the frame length of CSMA is set to 30ms. It should be noted that the frame length of TDD and CSMA can be set according to actual application requirements, and is not limited to the examples listed in this application.

[0049] In one example, each node competes for a communication frame through a carrier sense multiple access protocol.

[0050] Optionally, in the Carrier Sense Multiple Access (CSMA) protocol, the monitoring device needs to listen to the channel before sending data to determine whether other devices are sending data. If the channel is idle, the device will send data; if the channel is busy, it will wait. When multiple devices share the same channel, if two devices send data at the same time and cause a channel conflict, the device will stop sending when it detects the conflict, and then wait for a random time before listening to the channel again to resend.

[0051] In one example, according to the preset priority of the monitoring device node, the time slot of the monitoring device node in the corresponding time division duplex frame is determined, and all the monitoring device nodes communicate with the intelligent switch central node at least once in the corresponding time slot.

[0052] Optionally, the intelligent switch central node allocates the communication time slot of each device according to the priority of the connected monitoring device. Each terminal node must communicate at least once in the time division duplex (TDD) time slot in the superframe to ensure that the monitoring device node and the central node do not lose connection, so as to ensure that the arc monitoring data sent by the monitoring device node can be received normally, thereby ensuring the accuracy and stability of arc detection.

[0053] In one example, step S101 includes: receiving arc monitoring data sent by the monitoring device node in the time slot corresponding to the monitoring device node, or in the communication frame of each node competition. Optionally, when the monitoring device node X detects an arc risk, the arc risk is reported to the intelligent switch central node at the nearest position (TDDX time slot or CSMA time slot) in the superframe.

[0054] In this way, based on the low-voltage power line high-speed carrier communication mode, time division duplex mode and carrier sense multiple access protocol, multiple monitoring results are transmitted to the central node of the intelligent switch through the power supply power line, so that the central node of the intelligent switch can judge the possibility of arc according to the data of each acquisition cycle, so as to perform arc protection. The accuracy of arc detection is improved by combining multiple devices for detection, and the signal frame is defined by time division duplex mode and carrier sense multiple access protocol to ensure the stability and security of data transmission, so as to improve the accuracy of arc detection.

[0055] Continue to refer to Figure 1 , after step S101, step S102 is performed, as follows.

[0056] Step S102: In response to the presence of an arc in the arc monitoring data, an alarm message is sent to all monitoring device nodes, wherein the alarm message includes a forced detection command.

[0057] Optionally, after the intelligent switch center node receives arc information sent by any monitoring device, it will send arc alarm information to all monitoring device nodes in the next superframe, so that all monitoring device nodes start the mandatory detection function. After the monitoring device node receives the mandatory detection information from the intelligent monitoring center node, each monitoring device node will send the detection result to the intelligent switch center node in the next superframe TDD interval. In this way, the detection function of all monitoring devices is started when an arc may occur, so as to obtain the detection results of multiple monitoring devices, thereby comprehensively judging whether a discharge phenomenon occurs based on multiple detection results, and improving the accuracy of arc detection.

[0058] Step S103, receiving the detection result returned by the monitoring device node in response to the forced detection command, and judging whether an arc occurs according to the detection result of each monitoring device node and a preset reliability weight.

[0059] Optionally, the reliability of each monitoring device node is different. Whether an arc occurs is comprehensively judged based on the reliability weight of each monitoring device node and the monitoring result, thereby improving the accuracy and reliability of arc detection. Compared with the prior art, multiple judgments are not required, which improves the efficiency of arc detection. Furthermore, the low-voltage power line high-speed carrier communication method can realize remote protection and automatic control. When it is judged that an arc occurs, the intelligent switch center node quickly cuts off the power supply of the faulty part, or takes other protective measures to ensure the safe operation of the power system.

[0060] In one example, step S103 includes:

[0061] Step S1031 : determining an arc detection score according to the detection result of each monitoring device node and the reliability weight of each device node.

[0062] Step S1032, in response to the arc detection score being greater than or equal to a preset threshold, it is determined that an arc has occurred; in response to the arc detection score being less than a preset threshold, it is determined that no arc has occurred, and the preset threshold is determined based on the detection result of each monitoring device node.

[0063] Optionally, the arc detection score is calculated as follows:

[0064]

[0065] Wherein, count represents the arc detection score; score represents the preset reliability weight of each monitoring device node; flag represents the detection result of the monitoring device node, and the detection result is presented in the form of an event flag, flag = 1 when there is an arc, and flag = 0 when there is no arc; i represents the i-th monitoring device node, and N represents the number of monitoring device nodes. In this application, the preset threshold is set to 80% of the sum of the detection results of all monitoring device nodes. When the arc detection score is greater than or equal to the preset threshold, it is judged that an arc has occurred, the power switch is cut off, and arc protection is performed. It should be noted that the preset threshold can be set according to the actual application scenario, and is not limited to the examples listed in this application.

[0066] In summary, the present application utilizes power lines as a communication medium through a low-voltage power line high-speed carrier communication method, and organizes multiple detection devices into the same communication network without adding any peripheral equipment. The signal frame is defined by the time division duplex method and the carrier sense multiple access protocol to ensure the stability and security of data transmission, which is convenient for improving the accuracy of arc detection. The multiple monitoring results are transmitted to the central node of the intelligent switch through the power supply power line, so that the central node of the intelligent switch can judge the possibility of the arc according to the data of each acquisition cycle, and improve the accuracy of arc detection by comprehensively processing the arc detection data of multiple monitoring devices. Compared with the prior art, there is no need for multiple judgments, which improves the efficiency of arc detection. When it is determined that an arc occurs, the central node of the intelligent switch quickly cuts off the power supply of the faulty part, or takes other protective measures to ensure the safe operation of the power system.

[0067] In a second aspect, an embodiment of the present application provides a combined detection device for arc protection. Figure 3 is a structural block diagram of a combined detection device for arc protection shown in an embodiment of the present application, such as Figure 3 As shown, the device includes a monitoring device 10 and an intelligent switch 20, and the device is used to implement the joint detection method for arc protection of the first aspect. The monitoring device 10 is electrically connected to the intelligent switch 20, and the intelligent switch 10 powers on and off the monitoring device 20, as well as data communication between the monitoring device 10 and the intelligent switch 20, through a low-voltage power line high-speed carrier communication method. Optionally, all monitoring devices require power supply, so the power line used for power supply is used to transmit the data of the monitoring device to the central node of the intelligent switch.

[0068] The monitoring device 10 is used to obtain arc monitoring data and send the arc monitoring data to the intelligent switch 20 .

[0069] The intelligent switch 20 is used to receive arc monitoring data sent by the monitoring device 10 within a periodic time, and in response to the presence of an arc in the arc monitoring data, send an alarm message to all monitoring devices 10, wherein the alarm message includes a forced detection command, receive the detection result returned by the monitoring device 10 in response to the forced detection command, and determine whether an arc occurs based on the detection result of each monitoring device 10 and a preset reliability weight.

[0070] Optionally, Figure 4 This is a schematic diagram of the communication topology between the smart switch and the monitoring device according to an exemplary embodiment. However, the network maintenance and communication routing algorithm of the communication network in this application relies on the low-voltage power line high-speed carrier communication mode, which has mesh characteristics when self-organizing, so the network topology formed is not limited to this example.

[0071] In one example, the frame structure of the low-voltage power line high-speed carrier communication signal line is defined to include: a time division duplex frame of the intelligent switch 20, a time division duplex frame of the monitoring device node 10, and a competition communication frame of each node, and the competition communication frame of each node is implemented through a carrier sense multiple access protocol.

[0072] In one example, according to the preset priority of the monitoring device node 10, the time slot of the monitoring device node 10 in the corresponding time division duplex frame is determined, and all monitoring device nodes 10 communicate with the intelligent switch 20 at least once in the corresponding time slot.

[0073] In one example, the intelligent switch 20 is used to receive arc monitoring data sent by the monitoring device node 10 in a time slot corresponding to the monitoring device node, or in a competitive communication frame of each node.

[0074] In one example, the intelligent switch 20 is used to determine an arc detection score according to the detection result of each monitoring device node 10 and the reliability weight of each device node. In response to the arc detection score being greater than or equal to a preset threshold, it is determined that an arc has occurred; in response to the arc detection score being less than a preset threshold, it is determined that no arc has occurred, and the preset threshold is determined based on the detection result of each monitoring device node 10.

[0075] In summary, the present application utilizes power lines as a communication medium through a low-voltage power line high-speed carrier communication method, and organizes multiple detection devices into the same communication network without adding any peripheral equipment. The signal frame is defined by the time division duplex method and the carrier sense multiple access protocol to ensure the stability and security of data transmission, which is convenient for improving the accuracy of arc detection. The multiple monitoring results are transmitted to the central node of the intelligent switch through the power supply power line, so that the central node of the intelligent switch can judge the possibility of the arc according to the data of each acquisition cycle, and improve the accuracy of arc detection by comprehensively processing the arc detection data of multiple monitoring devices. Compared with the prior art, there is no need for multiple judgments, which improves the efficiency of arc detection. When it is determined that an arc occurs, the central node of the intelligent switch quickly cuts off the power supply of the faulty part, or takes other protective measures to ensure the safe operation of the power system.

[0076] In a third aspect, an embodiment of the present application provides a joint detection system for arc protection, the system is used to implement the joint detection method for arc protection in the first aspect, the system includes a monitoring device node and an intelligent switch center node, the monitoring device node is electrically connected to the intelligent switch center node, Figure 5 is a structural block diagram of a joint detection system for arc protection according to an exemplary embodiment. Figure 5 As shown, the system includes:

[0077] Monitoring module 100: used for the intelligent switch central node to receive arc monitoring data sent by the monitoring device node within any cycle time.

[0078] Detection module 200: used to send an alarm message to all monitoring device nodes in response to the presence of an arc in the arc monitoring data, wherein the alarm message includes a forced detection command.

[0079] The judgment module 300 is used to receive the detection result returned by the monitoring device node in response to the forced detection command, and judge whether an arc occurs according to the detection result of each monitoring device node and a preset reliability weight.

[0080] In one example, the monitoring device node is electrically connected to the intelligent switch central node, and the intelligent switch central node powers on and off the monitoring device node, as well as data communication between the monitoring device node and the intelligent switch central node, is achieved through low-voltage power line high-speed carrier communication.

[0081] In one example, the frame structure of the low-voltage power line high-speed carrier communication signal line is defined to include: a time division duplex frame of the intelligent switch center node, a time division duplex frame of the monitoring device node, and a competitive communication frame of each node.

[0082] In one example, according to the preset priority of the monitoring device node, the time slot of the monitoring device node in the corresponding time division duplex frame is determined, and all the monitoring device nodes communicate with the intelligent switch central node at least once in the corresponding time slot.

[0083] In one example, each node competes for a communication frame through a carrier sense multiple access protocol.

[0084] In one example, the monitoring module 100 is applied to receive arc monitoring data sent by the monitoring device node in a time slot corresponding to the monitoring device node, or in a competitive communication frame of each node.

[0085] In one example, the determination module 300

[0086] Used to determine an arc detection score based on the detection result of each monitoring device node and the reliability weight of each device node.

[0087] In response to the arc detection score being greater than a preset threshold, it is determined that an arc has occurred; in response to the arc detection score being less than a preset threshold, it is determined that no arc has occurred, and the preset threshold is determined based on the detection result of each monitoring device node.

[0088] In summary, the present application utilizes power lines as a communication medium through a low-voltage power line high-speed carrier communication method, and organizes multiple detection devices into the same communication network without adding any peripheral equipment. The signal frame is defined by the time division duplex method and the carrier sense multiple access protocol to ensure the stability and security of data transmission, which is convenient for improving the accuracy of arc detection. The multiple monitoring results are transmitted to the central node of the intelligent switch through the power supply power line, so that the central node of the intelligent switch can judge the possibility of the arc according to the data of each acquisition cycle, and improve the accuracy of arc detection by comprehensively processing the arc detection data of multiple monitoring devices. Compared with the prior art, there is no need for multiple judgments, which improves the efficiency of arc detection. When it is determined that an arc occurs, the central node of the intelligent switch quickly cuts off the power supply of the faulty part, or takes other protective measures to ensure the safe operation of the power system.

[0089] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0090] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A combined detection method for arc protection, characterized in that: The method is applied to a joint detection system, the system includes a monitoring device node and an intelligent switch center node, the method is specifically applied to the intelligent switch center node, and the method includes: In any cycle time, the intelligent switch central node receives the arc monitoring data sent by the monitoring device node; In response to the presence of an arc in the arc monitoring data, sending an alarm message to all the monitoring device nodes, wherein the alarm message includes a forced detection command; The detection result returned by the monitoring device node in response to the forced detection command is received, and whether an arc occurs is determined according to the detection result of each monitoring device node and a preset reliability weight.

2. A combined detection method for arc protection according to claim 1, characterized in that: The monitoring device node is electrically connected to the intelligent switch center node, The power supply and power cut of the monitoring device node by the intelligent switch central node and the data communication between the monitoring device node and the intelligent switch central node are realized through the low-voltage power line high-speed carrier communication mode.

3. A combined detection method for arc protection according to claim 2, characterized in that: The frame structure of the low-voltage power line high-speed carrier communication signal line is defined as including: a time division duplex frame of the intelligent switch center node, a time division duplex frame of the monitoring device node, and a competitive communication frame of each node.

4. A combined detection method for arc protection according to claim 3, characterized in that: According to the preset priority of the monitoring device node, the time slot of the monitoring device node in the corresponding time division duplex frame is determined, and all the monitoring device nodes communicate with the intelligent switch central node at least once in the corresponding time slot.

5. A combined detection method for arc protection according to claim 3, characterized in that: The communication frames competed by the nodes are implemented by the carrier sense multiple access protocol.

6. A combined detection method for arc protection according to claim 4, characterized in that: The intelligent switch central node receives the arc monitoring data sent by the monitoring device node, including: Receive arc monitoring data sent by the monitoring device node in a time slot corresponding to the monitoring device node, or in a competitive communication frame of each node.

7. A combined detection method for arc protection according to claim 1, characterized in that: The determining whether an arc occurs according to the detection result of each monitoring device node and a preset reliability weight includes: Determine an arc detection score according to the detection result of each monitoring device node and the reliability weight of each device node; In response to the arc detection score being greater than a preset threshold, determining that an arc has occurred; In response to the arc detection score being less than the preset threshold, it is determined that no arc occurs, and the preset threshold is determined based on the detection result of each monitoring device node.

8. A combined detection device for arc protection, characterized in that: The device comprises a monitoring device and an intelligent switch, and the device is used to implement the combined detection method for arc protection according to any one of claims 1 to 7, wherein the monitoring device is electrically connected to the intelligent switch, and the intelligent switch supplies power to and cuts off power to the monitoring device, and data communication between the monitoring device and the intelligent switch is implemented through a low-voltage power line high-speed carrier communication method. The monitoring device is used to obtain arc monitoring data and send the arc monitoring data to the intelligent switch; The intelligent switch is used to receive arc monitoring data sent by the monitoring device within a periodic time, and in response to the existence of an arc in the arc monitoring data, send an alarm message to all the monitoring devices, wherein the alarm message includes a forced detection command, receive the detection result returned by the monitoring device in response to the forced detection command, and determine whether an arc occurs based on the detection result of each monitoring device and a preset reliability weight.

9. A combined detection device for arc protection according to claim 8, characterized in that: The frame structure of the low-voltage power line high-speed carrier communication signal line is defined as including: a time division duplex frame of an intelligent switch, a time division duplex frame of a monitoring device node, and a competitive communication frame of each node, wherein the competitive communication frame of each node is implemented through a carrier sense multiple access protocol.

10. A combined detection system for arc protection, characterized in that: The system is used to implement the joint detection method for arc protection according to any one of claims 1 to 7, the system comprises a monitoring device node and an intelligent switch center node, the monitoring device node is electrically connected to the intelligent switch center node, and the system comprises: Monitoring module: used for the intelligent switch center node to receive the arc monitoring data sent by the monitoring device node within any period of time; A detection module: configured to send an alarm message to all the monitoring device nodes in response to the presence of an arc in the arc monitoring data, wherein the alarm message includes a forced detection command; The judgment module is used to receive the detection result returned by the monitoring device node in response to the forced detection command, and judge whether an arc occurs according to the detection result of each monitoring device node and a preset reliability weight.

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