A small current line selection device effectiveness detection method and system

Abstract

The application discloses a kind of small current line selection device effectiveness detection method and system, the method is received when user sends the line break fault simulation signal, the fault parameter input by user is sent to fault simulation device, to make fault simulation device open corresponding fault simulation line;During the process of fault simulation line break, the environmental image of the area affected by fault simulation line that high-speed camera real-time acquisition is acquired, and the thermal image of the area affected by fault simulation line that infrared thermal imager real-time acquisition is acquired simultaneously;According to environmental image and thermal image, judge whether electrical fire accident occurs in the area affected by fault simulation line, if yes, determine the fault clearing capacity of small current line selection device according to the combustion condition of combustible in electrical fire accident, if no, determine the fault isolation capacity of small current line selection device is normal.Small current line selection device is detected effectively to ensure that small current line selection device can work normally in actual electrical fire scene.

Description

Technical Field

[0001] The present invention relates to the technical field of power systems, and in particular to a method and system for detecting the effectiveness of a small current line selection device. Background Art

[0002] Fault isolation methods, such as low-current line selection devices, play a crucial role in power systems, particularly in distribution networks where the neutral point is not directly grounded. These devices can quickly identify and isolate faulty lines, effectively reducing the risk of electrical fires caused by faults such as broken wires and discharges to trees. However, to ensure that these devices perform as expected in actual electrical fire scenarios, they must be tested and verified through testing. Currently, there are no methods for testing the effectiveness of low-current line selection devices in electrical fire scenarios. Summary of the Invention

[0003] The present invention provides a method and system for detecting the effectiveness of a small current line selection device. The method detects the effectiveness of the small current line selection device, thereby ensuring that the small current line selection device can play an expected role in actual electrical fire scenarios.

[0004] An embodiment of the present invention provides a method for detecting the effectiveness of a low-current line selection device, comprising:

[0005] Get the fault parameters entered by the user;

[0006] Upon receiving a line-break fault simulation signal sent by a user, the fault parameter is sent to the fault simulation device, so that the fault simulation device disconnects the corresponding fault simulation line according to the fault parameter;

[0007] During the disconnection of the fault simulation line, an environmental image of the area affected by the fault simulation line is acquired in real time by a high-speed camera, and a thermal image of the area affected by the fault simulation line is acquired in real time by an infrared thermal imager; wherein combustible materials are pre-placed in the area affected by the fault simulation line;

[0008] According to the environmental image and the thermal image, it is determined whether an electrical fire accident occurs in the affected area of ​​the fault simulation line.

[0009] If so, determine the fault clearing capability of the low current line selection device based on the combustion conditions of combustibles in electrical fire accidents.

[0010] If not, it is determined that the fault isolation capability of the small current line selection device is normal.

[0011] Furthermore, the fault parameters include: fault type parameters, fault location parameters and RLC load parameters; the fault simulation device includes a fault intelligent generation device and an RLC load;

[0012] The step of sending the fault parameter to the fault simulation device so that the fault simulation device disconnects the corresponding fault simulation circuit according to the fault parameter includes:

[0013] The fault type parameter, the fault location parameter, and the RLC load parameter are sent to the fault simulation device, so that the RLC load in the fault simulation device is adjusted according to the RLC load parameter, a fault simulation line at a corresponding position is selected according to the fault location parameter, and the intelligent fault generating device is controlled to disconnect the fault simulation line according to the fault type parameter.

[0014] Furthermore, judging whether an electrical fire accident occurs in the affected area of ​​the fault simulation line based on the environmental image and the thermal image includes:

[0015] Identify whether there is combustion in the combustible material within the affected area of ​​the fault simulation line in the environmental image, and identify whether there is a hot spot with a temperature exceeding a preset threshold in the thermal image; wherein the combustion phenomenon includes flames and smoke;

[0016] When it is identified that there is no burning phenomenon and no hot spot with a temperature exceeding a preset threshold, it is determined that no electrical fire accident has occurred in the affected area of ​​the fault simulation line;

[0017] When a combustion phenomenon is identified and the characteristics of the combustion phenomenon exceed a preset safety range, it is determined that an electrical fire accident has occurred in the affected area of ​​the fault simulation line; wherein the characteristics of the combustion phenomenon include flame size, flame color, and smoke density;

[0018] When it is identified that there are hot spots with temperatures exceeding a preset threshold and the number of hot spots with temperatures exceeding the preset threshold exceeds a preset safety value, it is determined that an electrical fire accident has occurred in the affected area of ​​the fault simulation line.

[0019] Furthermore, the method of determining the fault clearing capability of the low-current line selection device according to the combustion conditions of the combustibles in the electrical fire accident includes:

[0020] identifying the combustion status of combustibles in the electrical fire accident based on the environmental image and the thermal image;

[0021] When it is identified that the expansion rate of the ignition area of ​​the combustible material is within a preset controllable range, the fault clearing capability of the small current line selection device is determined to be effective;

[0022] Otherwise, it is determined that the fault clearing capability of the small current line selection device is invalid.

[0023] Furthermore, the effectiveness detection method of the small current line selection device further includes: obtaining a fault waveform recorded in real time by a recorder; wherein the fault waveform includes a busbar zero-sequence voltage, zero-sequence currents of each feeder, phase currents of each feeder, fault current of a fault point corresponding to a fault simulation line, and fault voltage of a fault point corresponding to a fault simulation line;

[0024] After determining the fault clearing capability of the low current line selection device based on the combustion conditions of combustibles in electrical fire accidents, it also includes:

[0025] According to the fault waveform, verify whether the fault point corresponding to the fault simulation circuit is cleared.

[0026] Furthermore, the method for detecting the effectiveness of the low-current line selection device further includes:

[0027] During the fault simulation line disconnection process, when the fault alarm information sent by the small current line selection device is received and the fault alarm information is consistent with the fault parameters, it is determined that the fault reporting capability of the small current line selection device is valid; wherein, the fault alarm information includes fault type information and fault location information.

[0028] An embodiment of the present invention further provides a low-current line selection device effectiveness detection system, comprising: a fault simulation device, a high-speed camera, an infrared thermal imager, and a effectiveness judgment subsystem; the effectiveness judgment subsystem comprises a data acquisition module, an image acquisition module, and a effectiveness judgment module;

[0029] The data acquisition module is used to acquire the fault parameters input by the user; and when receiving the disconnection fault simulation signal sent by the user, the fault parameters are sent to the fault simulation device; wherein the data acquisition module is connected to the fault simulation device via a wireless network;

[0030] The fault simulation device is used to disconnect the corresponding fault simulation circuit according to the fault parameter;

[0031] The image acquisition module is used to acquire, during the disconnection process of the fault simulation line, an environmental image of the area affected by the fault simulation line captured in real time by a high-speed camera, and simultaneously acquire a thermal image of the area affected by the fault simulation line captured in real time by an infrared thermal imager; wherein combustible materials are pre-placed in the area affected by the fault simulation line;

[0032] The validity judgment module is used to judge whether an electrical fire accident occurs in the affected area of ​​the fault simulation line based on the environmental image and the thermal image.

[0033] If so, the fault clearing capability of the low-current line selection device is determined according to the combustion conditions of the combustibles in the electrical fire accident; if not, the fault isolation capability of the low-current line selection device is determined to be normal.

[0034] Furthermore, the method of determining the fault clearing capability of the low-current line selection device according to the combustion conditions of the combustibles in the electrical fire accident includes:

[0035] identifying the combustion status of combustibles in the electrical fire accident based on the environmental image and the thermal image;

[0036] When it is identified that the expansion rate of the ignition area of ​​the combustible material is within a preset controllable range, the fault clearing capability of the small current line selection device is determined to be effective;

[0037] Otherwise, it is determined that the fault clearing capability of the small current line selection device is invalid.

[0038] Furthermore, the small current line selection device effectiveness detection system further includes: an oscilloscope;

[0039] The oscilloscope is used to record the fault waveform in real time; wherein the fault waveform includes the busbar zero-sequence voltage, the zero-sequence current of each feeder, the phase current of each feeder, the fault current of the fault point corresponding to the fault simulation line, and the fault voltage of the fault point corresponding to the fault simulation line;

[0040] The effectiveness judgment module is also used to verify whether the fault point corresponding to the fault simulation circuit is cleared based on the fault waveform. If not, it is determined that the fault clearing capability of the small current line selection device is invalid; if so, it is determined that the fault clearing capability of the small current line selection device is valid.

[0041] Furthermore, the validity judgment module is also used to determine that the fault reporting capability of the small current line selection device is valid when the fault alarm information sent by the small current line selection device is received and the fault alarm information is consistent with the fault parameters during the fault simulation line disconnection process; wherein, the fault alarm information includes fault type information and fault location information.

[0042] The following beneficial effects are achieved by implementing the present invention:

[0043] The application provides a small-current line selection device effectiveness detection method and system, when a user sends a line break fault simulation signal, the method sends a user input fault parameter to a fault simulation device, so that the fault simulation device disconnects a corresponding fault simulation line according to the fault parameter, and during the disconnection of the fault simulation line, an environmental image of a fault simulation line affected area is acquired by a high-speed camera in real time, a thermal image of the fault simulation line affected area is acquired by an infrared thermal imager in real time, and whether an electrical fire accident occurs in the fault simulation line affected area is judged according to the environmental image and the thermal image; if yes, the fault clearing capacity of the small-current line selection device is determined according to the combustion condition of a combustible material in the electrical fire accident; if no, the fault isolation capacity of the small-current line selection device is determined to be normal; thus, whether an electrical fire accident occurs in the fault simulation line affected area is judged by recognizing the environmental image and the thermal image, so that the effectiveness of the small-current line selection device is determined according to the occurrence state of the electrical fire accident, so that the staff can judge whether the small-current line selection device can normally work in an actual electrical fire scene based on the small-current line selection device effectiveness detection method, further ensure that the power system can safely and stably operate, and reduce the occurrence of electrical fire accidents. BRIEF DESCRIPTION OF DRAWINGS

[0044] In order to more clearly illustrate the technical solutions of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0045] Figure 1 It is a flowchart of the small-current line selection device effectiveness detection method provided by an embodiment of the present application;

[0046] Figure 2 It is a line break fault simulation scene diagram provided by an embodiment of the present application;

[0047] Figure 3 It is a structural diagram of the small-current line selection device effectiveness detection device provided by an embodiment of the present application;

[0048] Figure 4 It is a structural diagram of the small-current line selection device effectiveness detection device provided by another embodiment of the present application. DETAILED DESCRIPTION

[0049] To make the objectives, technical solutions, and advantages of this application more clear, the technical solutions in this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0051] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0052] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0053] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0054] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0055] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0056] See also Figure 1 , is a flow chart of a method for detecting the effectiveness of a low-current line selection device provided by one embodiment of the present invention, comprising:

[0057] S1. Obtain fault parameters input by the user;

[0058] In a preferred embodiment, the fault parameters include: a fault type parameter, a fault location parameter, and an RLC load parameter;

[0059] Specifically, staff can input fault parameters according to actual needs. Fault type parameters include specific types of simulated faults, such as disconnection faults, short circuit faults, and ground faults. Different types of faults have different manifestations and impacts in the electrical system. Therefore, by inputting different fault type parameters, the low-current line selection device's ability to identify and respond to different types of faults can be fully tested.

[0060] The fault location parameter specifies the specific location of the simulated fault in the electrical system, such as the beginning, middle, or end of the line. Different fault locations affect the propagation path and magnitude of the fault current, which in turn affects the detection performance of the low-current line selection device. By inputting different fault location parameters, the performance of the device can be evaluated when faults occur at different locations.

[0061] Furthermore, by adjusting the fault type parameters and fault location parameters, four types of line break faults can be simulated: load side grounding after line break, power side grounding after line break, neither power side nor load side grounding after line break, and both power side and load side grounding after line break.

[0062] The RLC load parameters include the values ​​of the resistance (R), inductance (L), and capacitance (C) connected to the simulated fault line. By adjusting the RLC load parameters, fault conditions under different load conditions can be simulated, further verifying the adaptability and stability of the device under different load conditions.

[0063] S2. upon receiving a line-break fault simulation signal sent by a user, sending the fault parameter to the fault simulation device, so that the fault simulation device disconnects the corresponding fault simulation line according to the fault parameter;

[0064] In a preferred embodiment, the fault simulation device includes a fault intelligent generating device and an RLC load;

[0065] The step of sending the fault parameter to the fault simulation device so that the fault simulation device disconnects the corresponding fault simulation circuit according to the fault parameter includes:

[0066] sending the fault type parameter, the fault location parameter, and the RLC load parameter to the fault simulation device, so that the RLC load in the fault simulation device is adjusted according to the RLC load parameter, a fault simulation line at a corresponding position is selected according to the fault location parameter, and the intelligent fault generating device is controlled to disconnect the fault simulation line according to the fault type parameter;

[0067] Specifically, the user sends a line-break fault simulation signal, and when the line-break fault simulation signal sent by the user is received, the fault parameter is sent to the fault simulation device;

[0068] After receiving these parameters, the fault simulation device will analyze and verify them to ensure the accuracy and completeness of the parameters. Then, the RLC load in the fault simulation device will adjust the parameters according to the RLC load parameters. In addition, based on the fault location parameters, the fault simulation device will select a corresponding fault simulation circuit. After selecting the fault simulation circuit, the fault simulation device will control the fault intelligent generation device to disconnect the fault simulation circuit according to the preset fault type based on the fault type parameters. This operation will simulate real electrical fault scenarios, such as broken wires, short circuits, or ground faults.

[0069] It should be noted that the intelligent fault generating device is a circuit breaker, and the occurrence and stopping of the fault simulation line breaking event is controlled by controlling the opening and closing of the circuit breaker.

[0070] S3. While the fault simulation line is disconnected, obtaining an environmental image of the area affected by the fault simulation line captured in real time by a high-speed camera, and simultaneously obtaining a thermal image of the area affected by the fault simulation line captured in real time by an infrared thermal imager; wherein combustible materials are pre-placed in the area affected by the fault simulation line;

[0071] Specifically, see Figure 2 , is a line break fault simulation scene diagram provided by a certain embodiment of the present application. The high-speed camera will collect environmental images of the area affected by the fault simulation line in real time during the disconnection process of the fault simulation line. At the same time, the infrared thermal imager will collect thermal images of the area affected by the fault simulation line in real time during the disconnection process of the fault simulation line.

[0072] S4. Determine, based on the environmental image and the thermal image, whether an electrical fire accident has occurred in the affected area of ​​the faulty simulated line; if so, determine the fault clearing capability of the low-current line selection device based on the combustion conditions of the combustibles in the electrical fire accident; if not, determine that the fault isolation capability of the low-current line selection device is normal;

[0073] In a preferred embodiment, judging whether an electrical fire accident occurs in the affected area of ​​the fault simulation line based on the environmental image and the thermal image includes:

[0074] Identify whether there is combustion in the combustible material within the affected area of ​​the fault simulation line in the environmental image, and identify whether there is a hot spot with a temperature exceeding a preset threshold in the thermal image; wherein the combustion phenomenon includes flames and smoke;

[0075] When it is identified that there is no burning phenomenon and no hot spot with a temperature exceeding a preset threshold, it is determined that no electrical fire accident has occurred in the affected area of ​​the fault simulation line;

[0076] When a combustion phenomenon is identified and the characteristics of the combustion phenomenon exceed a preset safety range, it is determined that an electrical fire accident has occurred in the affected area of ​​the fault simulation line; wherein the characteristics of the combustion phenomenon include flame size, flame color, and smoke density;

[0077] When it is identified that there are hot spots with temperatures exceeding a preset threshold and the number of hot spots with temperatures exceeding the preset threshold exceeds a preset safety value, it is determined that an electrical fire accident has occurred in the affected area of ​​the fault simulation line;

[0078] Specifically, identifying a number of environmental images captured by the high-speed camera during the disconnection of the fault simulation line, that is, identifying whether there is combustion of combustible materials in the area affected by the fault simulation line, where combustion phenomena include detecting flames and smoke. When it is identified that there is no combustion phenomenon and no hot spot with a temperature exceeding a preset threshold, it is determined that no electrical fire accident has occurred in the area affected by the fault simulation line;

[0079] If combustion is detected, further features related to the combustion phenomenon need to be extracted, including flame size, flame color, and smoke density. Specifically, flame colors mainly include red, orange, and yellow.

[0080] If the characteristics of the combustion phenomenon in the image, such as flame size, flame color, and smoke density, are found to exceed the preset safety range, it is determined that an electrical fire accident has occurred in the affected area of ​​the fault simulation line;

[0081] It should be noted that the safety range can be set according to actual needs. This process is not the focus of this application and will not be described in detail.

[0082] Then, it identifies whether there are hot spots with temperatures exceeding a preset threshold. These hot spots typically represent potential fire sources or areas where fire spreads. For identified hot spots, the number of these hot spots is counted. When the number of hot spots exceeds a preset safety threshold, it is also determined that an electrical fire accident has occurred in the affected area of ​​the faulty simulated line.

[0083] It should be noted that the safety value can be set according to actual needs. This process is not the focus of this application and will not be described in detail.

[0084] In a preferred embodiment, determining the fault clearing capability of the low-current line selection device based on the combustion conditions of combustibles in an electrical fire accident includes:

[0085] identifying the combustion status of combustibles in the electrical fire accident based on the environmental image and the thermal image;

[0086] When it is identified that the expansion rate of the ignition area of ​​the combustible material is within a preset controllable range, the fault clearing capability of the small current line selection device is determined to be effective;

[0087] Otherwise, it is determined that the fault clearing capability of the small current line selection device is invalid;

[0088] It should be noted that if the low-current line selection device clears the fault before igniting the combustibles, thereby avoiding the occurrence of an electrical fire accident, the fault isolation capability of the low-current line selection device is determined to be effective;

[0089] After an electrical fire accident is confirmed, the fault clearing capability of the low-current line selection device needs to be evaluated. The goal of evaluating the fault clearing capability is to prevent the fault from propagating and expanding.

[0090] Specifically, based on the environmental image and the thermal image, the combustion status of the combustibles in the electrical fire accident is identified, the expansion rate of the combustible area ignited is identified, and then the fire development trend is evaluated based on this expansion rate. By comparing the expansion rate of the combustible area ignited with a preset controllable amplitude, the fault clearing capability of the low-current line selection device is effectively evaluated;

[0091] Specifically, if it is determined that the expansion rate of the ignited combustible material area is within a preset controllable range, it means that the low-current line selection device can quickly respond and cut off the faulty line when an electrical fire accident occurs, thereby effectively curbing the further expansion of the fire. Therefore, the fault clearing capability of the low-current line selection device is determined to be effective.

[0092] However, if it is identified that the expansion rate of the ignited combustible area exceeds the preset controllable range, it means that the small current line selection device failed to respond in time or cut off the fault line when the electrical fire accident occurred, resulting in the fire being unable to be effectively controlled. Therefore, the fault clearing ability of the small current line selection device is judged to be invalid.

[0093] In a preferred embodiment, the method for detecting the effectiveness of the small current line selection device further includes: obtaining a fault waveform recorded in real time by a recorder; wherein the fault waveform includes the busbar zero-sequence voltage, the zero-sequence current of each feeder, the phase current of each feeder, the fault current of the fault simulation line corresponding to the fault point, and the fault voltage of the fault simulation line corresponding to the fault point;

[0094] After determining the fault clearing capability of the low current line selection device based on the combustion conditions of combustibles in electrical fire accidents, it also includes:

[0095] According to the fault waveform, verify whether the fault point corresponding to the fault simulation circuit is cleared.

[0096] Illustratively, after determining the fault clearing capability of the low-current line selection device based on the combustion conditions of combustibles in an electrical fire accident, further verification of the effectiveness detection result is required to improve the accuracy of the effectiveness detection of the low-current line selection device.

[0097] In a preferred embodiment, the method for detecting the effectiveness of the small current line selection device also includes: during the fault simulation line disconnection process, when the fault alarm information sent by the small current line selection device is received and the fault alarm information is consistent with the fault parameters, determining that the fault reporting capability of the small current line selection device is valid; wherein, the fault alarm information includes fault type information and fault location information.

[0098] In principle, when a low-current line selection device detects a line fault, it should be able to quickly issue an alarm signal. Therefore, the fault reporting capability is also included as one of the aspects of the effectiveness detection of the low-current line selection device.

[0099] Specifically, during the fault simulation line disconnection process, if the fault alarm information sent by the small current line selection device is received, and the fault type information and fault location information reported in the fault alarm information are consistent with the fault type parameters and fault location parameters in the fault parameters input by the user, the fault reporting capability of the small current line selection device is determined to be valid.

[0100] See Figure 3, is a small current line selection device effectiveness detection system provided by one embodiment of the present invention, comprising: a fault simulation device 1, a high-speed camera 2, an infrared thermal imager 3, and a effectiveness judgment subsystem 4; the effectiveness judgment subsystem 4 includes a data acquisition module 4-1, an image acquisition module 4-2, and a effectiveness judgment module 4-3;

[0101] The data acquisition module 4-1 is used to obtain the fault parameters input by the user; and when receiving the disconnection fault simulation signal sent by the user, the fault parameters are sent to the fault simulation device 1; wherein the data acquisition module 4-1 is connected to the fault simulation device 1 via a wireless network;

[0102] The fault simulation device 1 is used to disconnect the corresponding fault simulation circuit according to the fault parameter;

[0103] The image acquisition module 4-2 is used to acquire, during the disconnection process of the faulty simulated line, an environmental image of the area affected by the faulty simulated line captured in real time by the high-speed camera 2, and simultaneously acquire a thermal image of the area affected by the faulty simulated line captured in real time by the infrared thermal imager 3; wherein combustible materials are pre-placed in the area affected by the faulty simulated line;

[0104] The effectiveness judgment module 4-3 is used to judge whether an electrical fire accident occurs in the affected area of ​​the fault simulation line based on the environmental image and the thermal image; if so, determine the fault clearing capability of the small current line selection device based on the combustion conditions of the combustibles in the electrical fire accident; if not, determine that the fault isolation capability of the small current line selection device is normal;

[0105] Specifically, see Figure 4 The fault simulation device 1 includes a fault intelligent generating device 1-1 and an RLC load 1-2; the fault intelligent generating device 1-1 is used to disconnect the fault simulation circuit according to the fault type parameters; the RLC load 1-2 is used to adjust the resistance, inductance and capacitance parameters according to the RLC load parameters.

[0106] In a preferred embodiment, determining the fault clearing capability of the low-current line selection device based on the combustion conditions of combustibles in an electrical fire accident includes:

[0107] identifying the combustion status of combustibles in the electrical fire accident based on the environmental image and the thermal image;

[0108] When it is identified that the expansion rate of the ignition area of ​​the combustible material is within a preset controllable range, the fault clearing capability of the small current line selection device is determined to be effective;

[0109] Otherwise, it is determined that the fault clearing capability of the small current line selection device is invalid.

[0110] In a preferred embodiment, the small current line selection device effectiveness detection system further includes: an oscilloscope;

[0111] The oscilloscope is used to record the fault waveform in real time; wherein the fault waveform includes the busbar zero-sequence voltage, the zero-sequence current of each feeder, the phase current of each feeder, the fault current of the fault point corresponding to the fault simulation line, and the fault voltage of the fault point corresponding to the fault simulation line;

[0112] The validity judgment module 4-3 is also used to verify whether the fault point corresponding to the fault simulation circuit is cleared based on the fault waveform. If not, it is determined that the fault clearing ability of the small current line selection device is invalid; if so, it is determined that the fault clearing ability of the small current line selection device is valid.

[0113] In a preferred embodiment, the validity judgment module 4-3 is also used to determine that the fault reporting capability of the small current line selection device is valid when the fault alarm information sent by the small current line selection device is received and the fault alarm information is consistent with the fault parameters during the fault simulation line disconnection process; wherein the fault alarm information includes fault type information and fault location information.

[0114] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for detecting the effectiveness of a low-current line selection device, characterized in that: Applicable to the effectiveness detection system of small current line selection device, including: Get the fault parameters entered by the user; Upon receiving a line-break fault simulation signal sent by a user, the fault parameter is sent to the fault simulation device, so that the fault simulation device disconnects the corresponding fault simulation line according to the fault parameter; During the disconnection of the fault simulation line, an environmental image of the area affected by the fault simulation line is acquired in real time by a high-speed camera, and a thermal image of the area affected by the fault simulation line is acquired in real time by an infrared thermal imager; wherein combustible materials are pre-placed in the area affected by the fault simulation line; Based on the environmental image and the thermal image, determine whether an electrical fire accident occurs in the affected area of ​​the fault simulation line. If so, determine the fault clearing capability of the small current line selection device based on the combustion conditions of the combustible materials in the electrical fire accident. If not, determine that the fault isolation capability of the small current line selection device is normal.

2. The method for detecting the effectiveness of a low-current line selection device according to claim 1, wherein: The fault parameters include: fault type parameters, fault location parameters and RLC load parameters; the fault simulation device includes a fault intelligent generation device and an RLC load; The step of sending the fault parameter to the fault simulation device so that the fault simulation device disconnects the corresponding fault simulation circuit according to the fault parameter includes: The fault type parameter, the fault location parameter, and the RLC load parameter are sent to the fault simulation device, so that the RLC load in the fault simulation device is adjusted according to the RLC load parameter, a fault simulation line at a corresponding position is selected according to the fault location parameter, and the intelligent fault generating device is controlled to disconnect the fault simulation line according to the fault type parameter.

3. The method for detecting the effectiveness of a low-current line selection device according to claim 2, wherein: The determining, based on the environmental image and the thermal image, whether an electrical fire accident occurs in the affected area of ​​the fault simulation line includes: Identify whether there is combustion in the combustible material within the affected area of ​​the fault simulation line in the environmental image, and identify whether there is a hot spot with a temperature exceeding a preset threshold in the thermal image; wherein the combustion phenomenon includes flames and smoke; When it is identified that there is no burning phenomenon and no hot spot with a temperature exceeding a preset threshold, it is determined that no electrical fire accident has occurred in the affected area of ​​the fault simulation line; When a combustion phenomenon is identified and the characteristics of the combustion phenomenon exceed a preset safety range, it is determined that an electrical fire accident has occurred in the affected area of ​​the fault simulation line; wherein the characteristics of the combustion phenomenon include flame size, flame color, and smoke density; When it is identified that there are hot spots with temperatures exceeding a preset threshold and the number of hot spots with temperatures exceeding the preset threshold exceeds a preset safety value, it is determined that an electrical fire accident has occurred in the affected area of ​​the fault simulation line.

4. The method for detecting the effectiveness of a low-current line selection device according to claim 3, wherein: The method of determining the fault clearing capability of the low-current line selection device according to the combustion conditions of combustibles in an electrical fire accident includes: identifying the combustion status of combustibles in the electrical fire accident based on the environmental image and the thermal image; When it is identified that the expansion rate of the ignition area of ​​the combustible material is within a preset controllable range, the fault clearing capability of the small current line selection device is determined to be effective; Otherwise, it is determined that the fault clearing capability of the small current line selection device is invalid.

5. The method for detecting the effectiveness of a low-current line selection device according to claim 4, wherein: Also includes: Obtaining the fault waveform recorded in real time by the oscilloscope; wherein the fault waveform includes the busbar zero-sequence voltage, the zero-sequence current of each feeder, the phase current of each feeder, the fault current of the fault point corresponding to the fault simulation line, and the fault voltage of the fault point corresponding to the fault simulation line; After determining the fault clearing capability of the low current line selection device based on the combustion conditions of combustibles in electrical fire accidents, it also includes: According to the fault waveform, verify whether the fault point corresponding to the fault simulation circuit is cleared.

6. The method for detecting the effectiveness of a low-current line selection device according to claim 5, wherein: Also includes: During the fault simulation line disconnection process, when the fault alarm information sent by the small current line selection device is received and the fault alarm information is consistent with the fault parameters, it is determined that the fault reporting capability of the small current line selection device is valid; wherein, the fault alarm information includes fault type information and fault location information.

7. A small current line selection device effectiveness detection system, characterized in that: include: Fault simulation device, high-speed camera, infrared thermal imager, and effectiveness judgment subsystem; The validity judgment subsystem includes a data acquisition module, an image acquisition module and a validity judgment module; The data acquisition module is used to acquire the fault parameters input by the user; and when receiving the disconnection fault simulation signal sent by the user, the fault parameters are sent to the fault simulation device; wherein the data acquisition module is connected to the fault simulation device via a wireless network; The fault simulation device is used to disconnect the corresponding fault simulation circuit according to the fault parameter; The image acquisition module is used to acquire, during the disconnection process of the fault simulation line, an environmental image of the area affected by the fault simulation line captured in real time by a high-speed camera, and simultaneously acquire a thermal image of the area affected by the fault simulation line captured in real time by an infrared thermal imager; wherein combustible materials are pre-placed in the area affected by the fault simulation line; The effectiveness judgment module is used to judge whether an electrical fire accident occurs in the affected area of ​​the fault simulation line based on the environmental image and the thermal image. If so, the fault clearing capability of the small current line selection device is determined based on the combustion conditions of the combustible materials in the electrical fire accident. If not, the fault isolation capability of the small current line selection device is determined to be normal.

8. The low current line selection device effectiveness detection system according to claim 7, characterized in that: The method of determining the fault clearing capability of the low-current line selection device according to the combustion conditions of combustibles in an electrical fire accident includes: identifying the combustion status of combustibles in the electrical fire accident based on the environmental image and the thermal image; When it is identified that the expansion rate of the ignition area of ​​the combustible material is within a preset controllable range, the fault clearing capability of the small current line selection device is determined to be effective; Otherwise, it is determined that the fault clearing capability of the small current line selection device is invalid.

9. The low current line selection device effectiveness detection system according to claim 8, characterized in that: Also includes: Wave recorder; The oscilloscope is used to record the fault waveform in real time; wherein the fault waveform includes the busbar zero-sequence voltage, the zero-sequence current of each feeder, the phase current of each feeder, the fault current of the fault point corresponding to the fault simulation line, and the fault voltage of the fault point corresponding to the fault simulation line; The effectiveness judgment module is also used to verify whether the fault point corresponding to the fault simulation circuit is cleared based on the fault waveform. If not, it is determined that the fault clearing capability of the small current line selection device is invalid; if so, it is determined that the fault clearing capability of the small current line selection device is valid.

10. The small current line selection device effectiveness detection system according to claim 9, characterized in that: The validity judgment module is also used to determine that the fault reporting capability of the small current line selection device is valid when the fault alarm information sent by the small current line selection device is received and the fault alarm information is consistent with the fault parameters during the fault simulation line disconnection process; wherein the fault alarm information includes fault type information and fault location information.

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