Effectiveness detection method and system for low-current line selection device

Abstract

The invention discloses an effectiveness detection method and system for a low-current line selection device, and the method comprises the steps: transmitting a fault parameter inputted by a user to a fault simulation device when a disconnection fault simulation signal transmitted by the user is received, so as to enable the fault simulation device to open a corresponding fault simulation line; in the disconnection process of the fault simulation line, acquiring an environment image of a fault simulation line swept area acquired by a high-speed camera in real time, and simultaneously acquiring a thermal image of the fault simulation line swept area acquired by an infrared thermal imager in real time; according to the environment image and the thermal image, whether an electrical fire accident occurs in the fault simulation line swept area is judged, if yes, the fault clearing capacity of the small current line selection device is determined according to the combustion condition of combustibles in the electrical fire accident, and if not, the fault isolation capacity of the small current line selection device is judged to be normal. Effectiveness detection is carried out on the low-current line selection device so as to ensure that the low-current line selection device can work normally in an 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 means represented by small current line selection devices play a vital role in power systems, especially for distribution networks where the neutral point is not directly grounded. Small current line selection devices can quickly identify and isolate faulty lines, effectively reducing the risk of electrical fires caused by faults such as broken lines and discharges to trees. However, to ensure that the small current line selection device can play the expected role in actual electrical fire scenarios, it must be tested and verified through experimental means. In the existing technology, there is no method for detecting the effectiveness of small current line selection devices based on 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 an actual electrical fire scenario.

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

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

[0006] When receiving a disconnection 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 process of the fault simulation line, an environmental image of the area affected by the fault simulation line acquired in real time by a high-speed camera is obtained, and a thermal image of the area affected by the fault simulation line acquired in real time by an infrared thermal imager is simultaneously obtained; wherein combustibles are placed in advance 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 the combustibles in the electrical fire accident.

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

[0011] Further, 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 a fault simulation device so that the fault simulation device disconnects a corresponding fault simulation circuit according to the fault parameter comprises:

[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, the fault simulation line at the corresponding position is selected according to the fault location parameter, and the fault intelligent generating device is controlled to disconnect the fault simulation line according to the fault type parameter.

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

[0015] Identify whether there is a combustion phenomenon in the combustible material located in 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 whose temperature exceeds the preset threshold, it is determined that no electrical fire accident has occurred in the affected area of ​​the fault simulation line;

[0017] When it is identified that there is a combustion phenomenon and the characteristics of the combustion phenomenon exceed the preset safety range, it is determined that an electrical fire accident occurs 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 whose temperature exceeds the preset threshold and the number of hot spots whose temperature exceeds the preset threshold exceeds the preset safety value, it is determined that an electrical fire accident occurs 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 conditions of combustibles in the electrical fire accident according to the environmental image and the thermal image;

[0021] When it is identified that the expansion rate of the ignition area of ​​the combustibles 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 the fault waveform recorded in real time by the recorder; wherein the fault waveform includes the bus 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;

[0024] After determining the fault clearing capability of the small current line selection device according to 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 effectiveness detection method of the small 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, the fault reporting capability of the small current line selection device is determined to be valid; wherein the fault alarm information includes fault type information and fault location information.

[0028] An embodiment of the present invention further provides a small current line selection device effectiveness detection system, comprising: a fault simulation device, a high-speed camera, an infrared thermal imager and an effectiveness judgment subsystem; the effectiveness judgment subsystem comprises a data acquisition module, an image acquisition module and an 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 an environmental image of the affected area of ​​the fault simulation line acquired in real time by a high-speed camera during the disconnection process of the fault simulation line, and simultaneously acquire a thermal image of the affected area of ​​the fault simulation line acquired in real time by an infrared thermal imager; wherein combustibles are placed in advance in the affected area of ​​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 according to the environmental image and the thermal image.

[0033] If so, the fault clearing capability of the small 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 small 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 conditions of combustibles in the electrical fire accident according to the environmental image and the thermal image;

[0036] When it is identified that the expansion rate of the ignition area of ​​the combustibles 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 recorder is used to record the fault waveform in real time; wherein the fault waveform includes the bus 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;

[0040] The effectiveness judgment module is also used to verify whether the fault point corresponding to the fault simulation circuit is cleared according to 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.

[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 present invention provides a method and system for detecting the effectiveness of a small current line selection device. When receiving a line disconnection fault simulation signal sent by a user, the method sends the fault parameters input by the user to the fault simulation device, so that the fault simulation device disconnects the corresponding fault simulation line according to the fault parameters, and in the process of disconnecting the fault simulation line, obtains an environmental image of the affected area of ​​the fault simulation line acquired in real time by a high-speed camera, and simultaneously obtains a thermal image of the affected area of ​​the fault simulation line acquired in real time by an infrared thermal imager, and judges whether an electrical fire accident occurs in the affected area of ​​the fault simulation line according to the environmental image and the thermal image. If so, the fault clearing capability of the small current line selection device is determined according to the combustion condition of the combustibles in the electrical fire accident. If not, the fault isolation capability of the small current line selection device is determined to be normal. Thus, by identifying the environmental image and the thermal image, it is judged whether an electrical fire accident occurs in the affected area of ​​the fault simulation line, and 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 work normally in the actual electrical fire scene based on the small current line selection device effectiveness detection method, further ensuring that the power system can operate safely and stably, and reducing the occurrence of electrical fire accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the implementation manner will be briefly introduced below. Obviously, the drawings described below are only some implementation manners of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0045] Figure 1 It is a flowchart of a method for detecting the effectiveness of a small current line selection device provided in a certain embodiment of the present application;

[0046] Figure 2 This is a disconnection fault simulation scenario diagram provided by a certain embodiment of the present application;

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

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

[0049] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are 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 creative work 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 technicians in the technical field 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" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0051] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0052] Reference to "embodiments" herein 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 skilled in the art that the embodiments described herein may be combined with other embodiments.

[0053] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the 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. In addition, the character " / " in this article generally indicates that the associated objects before and after 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 clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0056] See also Figure 1 , is a flow chart of a method for detecting the effectiveness of a small current line selection device provided by an 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, the staff can input fault parameters according to actual needs. The fault type parameters include the specific types of simulated faults, such as disconnection faults, short circuit faults, grounding faults, etc. Different types of faults have different manifestations and impacts in the electrical system. Therefore, by inputting different fault type parameters, the recognition and response capabilities of the small current line selection device 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 will affect the propagation path and size of the fault current, and thus affect the detection effect of the small current line selection device. By inputting different fault location parameters, the performance of the device when faults occur at different locations can be evaluated.

[0061] Furthermore, by adjusting the fault type parameters and the fault location parameters, four types of line break faults can be simulated: load side grounding after line break, power supply side grounding after line break, both power supply side and load side not grounded after line break, and both power supply side and load side grounded 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, the fault conditions under different load conditions are simulated, and the adaptability and stability of the device under different load conditions are further verified.

[0063] S2. When receiving a disconnection 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 generation device and an RLC load;

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

[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 fault intelligent generating device is controlled to disconnect the fault simulation line according to the fault type parameter;

[0067] Specifically, the user sends a disconnection fault simulation signal, and when the disconnection 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, and then the RLC load in the fault simulation device will adjust the parameters according to the RLC load parameters; in addition, according to the fault location parameters, the fault simulation device will select the 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 according to the fault type parameters; this operation will simulate real electrical fault scenarios, such as disconnection, short circuit or ground fault, etc.

[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. During the disconnection process of the fault simulation line, an environmental image of the area affected by the fault simulation line acquired in real time by a high-speed camera is obtained, and a thermal image of the area affected by the fault simulation line acquired in real time by an infrared thermal imager is simultaneously obtained; wherein combustibles are placed in advance in the area affected by the fault simulation line;

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

[0072] S4. judging whether an electrical fire accident occurs in the affected area of ​​the fault simulation line according to the environmental image and the thermal image; if so, determining the fault clearing capability of the small current line selection device according to the combustion conditions of the combustibles in the electrical fire accident; if not, judging that the fault isolation capability of the small 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 according to the environmental image and the thermal image includes:

[0074] Identify whether there is a combustion phenomenon in the combustible material located in 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 whose temperature exceeds the preset threshold, it is determined that no electrical fire accident has occurred in the affected area of ​​the fault simulation line;

[0076] When it is identified that there is a combustion phenomenon and the characteristics of the combustion phenomenon exceed the preset safety range, it is determined that an electrical fire accident occurs 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 a temperature exceeding a preset threshold and the number of hot spots with a temperature exceeding the preset threshold exceeds a preset safety value, it is determined that an electrical fire accident occurs in the affected area of ​​the fault simulation line;

[0078] Specifically, a plurality of environmental images collected by the high-speed camera during the disconnection of the fault simulation line are identified, that is, whether there is a combustion phenomenon in the combustible material located in the affected area of ​​the fault simulation line, and the combustion phenomenon includes the detection of flames and smoke. When it is identified that there is no combustion phenomenon and no hot spot whose temperature exceeds a preset threshold, it is determined that no electrical fire accident has occurred in the affected area of ​​the fault simulation line;

[0079] If combustion is detected, it is necessary to further extract relevant features of the combustion, including flame size, flame color, and smoke density. Specifically, flame colors mainly include red, orange, and yellow.

[0080] If the characteristics of the burning phenomenon in the image, such as the 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 is identified whether there are hot spots whose temperature exceeds a preset threshold value. These hot spots usually represent potential fire sources or fire spreading areas. For the identified hot spots, the number of these hot spots is counted. When the number of the hot spots exceeds a preset safety value, it is also determined that an electrical fire accident has occurred in the affected area of ​​the fault simulation 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, 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:

[0085] Identifying the combustion conditions of combustibles in the electrical fire accident according to the environmental image and the thermal image;

[0086] When it is identified that the expansion rate of the ignition area of ​​the combustibles 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 small 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 small current line selection device is determined to be effective;

[0089] After it is determined that an electrical fire accident has occurred, it is necessary to evaluate the fault clearing capability of the small current line selection device. The goal of evaluating the fault clearing capability is to prevent the fault from propagating and expanding.

[0090] Specifically, according to the environmental image and the thermal image, the combustion conditions of the combustibles in the electrical fire accident are identified, the expansion rate of the combustible ignition area is identified, and then the fire development trend is evaluated according to the expansion rate. By comparing the expansion rate of the combustible ignition area with the preset controllable amplitude, the fault clearing capability of the small current line selection device is effectively evaluated;

[0091] Specifically, when it is identified that the expansion rate of the ignited area of ​​the combustibles is within a preset controllable range, it means that the small current line selection device can quickly respond and cut off the fault line when an electrical fire accident occurs, thereby effectively curbing the further expansion of the fire. Therefore, it is determined that the fault clearing ability of the small current line selection device is 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 faulty 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 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 bus zero-sequence voltage, zero-sequence currents of each feeder, phase currents of each feeder, a fault current of a fault point corresponding to a fault simulation line, and a fault voltage of a fault point corresponding to a fault simulation line;

[0094] After determining the fault clearing capability of the small current line selection device according to 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 according to the combustion conditions of combustibles in an electrical fire accident, it is necessary to further verify the effectiveness detection result, thereby improving 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] Indicatively, when the low-current line selection device detects a line fault, it should be able to quickly send out an alarm signal. Therefore, the fault reporting capability is also included as one of the contents 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 also Figure 3, is a small current line selection device effectiveness detection system provided by an embodiment of the present invention, comprising: a fault simulation device 1, a high-speed camera 2, an infrared thermal imager 3 and an effectiveness judgment subsystem 4; the effectiveness judgment subsystem 4 comprises a data acquisition module 4-1, an image acquisition module 4-2 and an effectiveness judgment module 4-3;

[0101] The data acquisition module 4-1 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 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 the environmental image of the affected area of ​​the fault simulation line acquired in real time by the high-speed camera 2 during the disconnection process of the fault simulation line, and simultaneously acquire the thermal image of the affected area of ​​the fault simulation line acquired in real time by the infrared thermal imager 3; wherein the affected area of ​​the fault simulation line is pre-placed with combustibles;

[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 according to the environmental image and the thermal image. If so, the fault clearing capability of the small 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 small current line selection device is determined to be 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, 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:

[0107] Identifying the combustion conditions of combustibles in the electrical fire accident according to the environmental image and the thermal image;

[0108] When it is identified that the expansion rate of the ignition area of ​​the combustibles 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: a wave recorder;

[0111] The recorder is used to record the fault waveform in real time; wherein the fault waveform includes the bus 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;

[0112] The effectiveness judgment module 4-3 is also used to verify whether the fault point corresponding to the fault simulation line is cleared according to the fault waveform. If not, the fault clearing ability of the small current line selection device is determined to be invalid; if so, the fault clearing ability of the small current line selection device is determined to be 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 a person skilled in the art can make several improvements and modifications without departing from the principle 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 small current line selection device, characterized in that: Applicable to the effectiveness detection system of small current line selection device, including: Get the fault parameters input by the user; When receiving a disconnection 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 process of the fault simulation line, an environmental image of the area affected by the fault simulation line acquired in real time by a high-speed camera is obtained, and a thermal image of the area affected by the fault simulation line acquired in real time by an infrared thermal imager is simultaneously obtained; wherein combustibles are placed in advance 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 combustibles 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 small current line selection device according to claim 1, characterized in that: 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 a fault simulation device so that the fault simulation device disconnects a corresponding fault simulation circuit according to the fault parameter comprises: 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, the fault simulation line at the corresponding position is selected according to the fault location parameter, and the fault intelligent 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 small current line selection device according to claim 2, characterized in that: 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 a combustion phenomenon in the combustible material located in 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 whose temperature exceeds the preset threshold, it is determined that no electrical fire accident has occurred in the affected area of ​​the fault simulation line; When it is identified that there is a combustion phenomenon and the characteristics of the combustion phenomenon exceed the preset safety range, it is determined that an electrical fire accident occurs 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 whose temperature exceeds the preset threshold and the number of hot spots whose temperature exceeds the preset threshold exceeds the preset safety value, it is determined that an electrical fire accident occurs in the affected area of ​​the fault simulation line.

4. The method for detecting the effectiveness of a small current line selection device according to claim 3, characterized in that: 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: Identifying the combustion conditions of combustibles in the electrical fire accident according to the environmental image and the thermal image; When it is identified that the expansion rate of the ignition area of ​​the combustibles 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 small current line selection device according to claim 4, characterized in that: Also includes: Obtain the fault waveform recorded in real time by the recorder; wherein the fault waveform includes the bus 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 small current line selection device according to 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 small current line selection device according to claim 5, characterized in that: 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, the fault reporting capability of the small current line selection device is determined to be 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 an environmental image of the affected area of ​​the fault simulation line acquired in real time by a high-speed camera during the disconnection process of the fault simulation line, and simultaneously acquire a thermal image of the affected area of ​​the fault simulation line acquired in real time by an infrared thermal imager; wherein combustibles are placed in advance in the affected area of ​​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 combustibles 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 small 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 the combustibles in the electrical fire accident includes: Identifying the combustion conditions of combustibles in the electrical fire accident according to the environmental image and the thermal image; When it is identified that the expansion rate of the ignition area of ​​the combustibles 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 small current line selection device effectiveness detection system according to claim 8, characterized in that: Also includes: Wave recorder; The recorder is used to record the fault waveform in real time; wherein the fault waveform includes the bus 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; The effectiveness judgment module is also used to verify whether the fault point corresponding to the fault simulation circuit is cleared according to 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.

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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