Receiving end detection device, sending end detection device and electrical equipment detection method

Abstract

The invention provides a receiving end detection device, a sending end detection device and an electrical equipment detection method, and belongs to the technical field of circuit breaker performance detection, and the receiving end detection device comprises a capacitive module and a signal receiving module. Wherein the capacitive module is connected with the first power transmission line and is connected with to-be-tested electrical equipment, and the capacitive module and the to-be-tested electrical equipment form a low-pass filtering structure; the low-pass filtering structure is used for receiving the reference carrier signal and filtering the reference carrier signal to obtain a test carrier signal; and the signal receiving module is connected with the capacitive module and is used for receiving the test carrier signal and generating amplitude information of the test carrier signal, so that the terminal equipment generates a performance detection result of the circuit breaker according to the preset amplitude of the reference carrier signal and the amplitude information. The transmission of the reference carrier signal does not influence the normal work of the power transmission line, and the circuit breaker does not need to execute switching operation, so that the online detection of the performance of the circuit breaker is realized.

Description

Technical Field

[0001] The present application relates to the technical field of circuit breaker performance detection, and in particular to a receiving end detection device, a transmitting end detection device and an electrical equipment detection method. Background Art

[0002] Electrical equipment is equipment with switching functions used in power transmission lines, such as circuit breakers, which quickly cut off the power supply when a circuit fault occurs, and can effectively protect the safety of electrical equipment and personnel. In actual applications, electrical equipment such as circuit breakers need to be frequently switched on and off, which will cause wear and deformation to the contact contacts and arc shields during the switching process, increase the contact resistance of the circuit breaker, and change the electrical characteristics, which can easily lead to a decrease in the electrical life of the electrical equipment.

[0003] At present, sensors and other detection devices are usually used to obtain parameters such as current and vibration signals of electrical equipment during the switching operation of electrical equipment, or the electrical equipment is removed for offline testing to analyze the performance of the electrical equipment. However, the detection method of obtaining the electrical equipment during the switching operation or offline detection will affect the normal power supply of the transmission line. Therefore, how to realize online detection of the performance of electrical equipment is an urgent problem to be solved. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present application provides a receiving end detection device, a transmitting end detection device and an electrical equipment detection method.

[0005] In a first aspect, the present application provides a receiving end detection device, comprising:

[0006] A capacitive module is connected to a first power transmission line, the first power transmission line is connected to the electrical device under test, and the capacitive module and the electrical device under test form a low-pass filter structure; the low-pass filter structure is used to receive a reference carrier signal and filter the reference carrier signal to obtain a test carrier signal;

[0007] A signal receiving module is connected to the capacitive module, and is used to receive the test carrier signal and generate amplitude information of the test carrier signal, so that the terminal device generates a performance detection result of the electrical device under test according to the preset amplitude of the reference carrier signal and the amplitude information.

[0008] Optionally, the electrical device to be tested is a circuit breaker; the output end of the circuit breaker is connected to the first power transmission line;

[0009] The contacts of the circuit breaker and the capacitive module constitute the low-pass filtering structure.

[0010] Optionally, it also includes a first communication module;

[0011] The first communication module is connected to the signal receiving module and the terminal device, and is used to receive the amplitude information and send the amplitude information to the terminal device.

[0012] Optionally, the capacitive module includes a capacitor;

[0013] The capacitor comprises a first end connected to a live line of any one phase in the first power transmission line and a second end connected to the signal receiving module and a neutral line in the first power transmission line.

[0014] Optionally, it further includes a switch module disposed between the first power transmission line and the capacitive module, the switch module being used to control the on-off between the first power transmission line and the capacitive module;

[0015] The switch module includes a switch device, and the switch device includes a first end connected to the first power transmission line, a second end connected to the capacitive module, and a control end connected to the first communication module.

[0016] In a second aspect, in one embodiment, the present application provides a transmitting end detection device, which communicates with the above-mentioned receiving end detection device, including:

[0017] a signal sending module, connected to the second transmission line, for sending reference carrier signals with preset amplitudes to the second transmission line at a plurality of preset frequency points, so that the reference carrier signals are transmitted to the low-pass filter structure through the second transmission line to obtain amplitude information of the test carrier signal;

[0018] The amplitude information of the test carrier signal and the preset amplitude of the reference carrier signal are used to generate the performance detection result of the electrical device to be tested.

[0019] Optionally, the electrical device to be tested is a circuit breaker; and an input end of the circuit breaker is connected to the second power transmission line.

[0020] Optionally, it further includes a second communication module connected to the signal sending module and the terminal device;

[0021] The second communication module is used to receive the sending instruction output by the terminal device, and output the sending instruction to the signal sending module to control the signal sending module to output the reference carrier signal with a preset amplitude to the second transmission line at each preset frequency point.

[0022] In a third aspect, in one embodiment, the present application provides an electrical device detection method, which is applied to a terminal device, wherein the terminal device is communicatively connected with the above-mentioned receiving end detection device and the above-mentioned sending end detection device, and the method includes:

[0023] Obtaining the preset amplitude of the reference carrier signal at each of the preset frequencies and the amplitude information of the corresponding test carrier signal;

[0024] Generate an attenuation amplitude corresponding to each of the preset frequencies according to the preset amplitude and the amplitude information at each of the preset frequencies;

[0025] A performance test result is generated according to the attenuation amplitude corresponding to each of the preset frequency points.

[0026] Optionally, generating the performance test result according to the attenuation amplitude corresponding to each of the preset frequency points includes:

[0027] Determine whether there is an attenuation amplitude greater than a preset attenuation threshold;

[0028] If so, generating a performance test result indicating that the electrical device under test is abnormal;

[0029] If not present, a normal performance test result of the electrical device to be tested is generated.

[0030] Optionally, after generating the abnormal performance detection result of the electrical device to be tested, the method further includes:

[0031] Performing interpolation processing on the attenuation amplitude corresponding to each of the preset frequency points to obtain an attenuation curve; wherein the attenuation curve is a corresponding relationship curve between frequency and attenuation amplitude;

[0032] Using the frequency corresponding to the preset attenuation threshold in the attenuation curve as the cutoff frequency of the low-pass filter structure;

[0033] The capacitance of the capacitive module is obtained, and the equivalent impedance of the electrical device to be tested is generated according to the capacitance and the cut-off frequency.

[0034] Optionally, also include:

[0035] Receiving an external control instruction, and determining each of the preset frequency points and the preset amplitude of the reference carrier signal according to the external control instruction;

[0036] The sending instruction is generated according to each of the preset frequency points and the preset amplitude, and the sending instruction is output to the sending end detection device.

[0037] Through the above technical solution, this application includes at least the following beneficial technical effects:

[0038] First, a capacitive module and the electrical device to be tested are used to form a low-pass filter structure, so as to filter the filtered reference carrier signal through the low-pass filter structure to obtain a test carrier signal. Secondly, the signal receiving module can identify the amplitude information of the test carrier signal, so that the terminal device can analyze the attenuation caused by the low-pass filter structure at a preset frequency based on the preset amplitude of the reference carrier signal and the amplitude information of the test carrier signal, so as to generate the performance test results of the electrical device to be tested. Since the reference carrier signal uses the electrical signal on the transmission line as a carrier to realize the transmission of the reference carrier signal, and the transmission of the reference carrier signal does not affect the normal operation of the transmission line, there is no need to make the electrical device to be tested perform a switching operation, thereby realizing online detection of the performance of the electrical device to be tested. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0040] Figure 1 This is a schematic diagram of an application scenario of an electrical equipment detection method in an embodiment of the present application;

[0041] Figure 2 A schematic diagram of a receiving end detection device and a transmitting end detection device in one embodiment of the present application;

[0042] Figure 3 This is a structural diagram of a receiving end detection device in one embodiment of the present application;

[0043] Figure 4 This is a structural diagram of a transmitting end detection device in one embodiment of the present application;

[0044] Figure 5 This is a flow chart of an electrical equipment detection method in one embodiment of the present application;

[0045] Figure 6 A flow chart of a method for calculating an equivalent circuit in one embodiment of the present application;

[0046] Figure 7 A waveform diagram of an attenuation curve in one embodiment of the present application;

[0047] Figure 8 This is a schematic diagram of the architecture of an electronic device in one embodiment of the present application. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0049] In the description of the present application, it should be understood that the terms "first" and "second" are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. In the present application, the word "exemplary" is used to mean "used as an example, illustration or description". Any embodiment described as "exemplary" in the present application is not necessarily interpreted as being more preferred or more advantageous than other embodiments. In order to enable any technician in the field to implement and use the present application, the following description is given. In the following description, details are listed for the purpose of explanation. It should be understood that a person of ordinary skill in the art can recognize that the present application can also be implemented without using these specific details. In other examples, well-known structures and processes will not be elaborated in detail to avoid unnecessary details that make the description of the present application obscure. Therefore, the present application is not intended to be limited to the embodiments shown, but is consistent with the widest range of principles and features disclosed in the present application.

[0050] The receiving end detection device in the embodiment of the present application is applied to the electrical equipment detection method, and the electrical equipment detection method is set in an electronic device; the electronic device can be a terminal, such as a mobile phone or a tablet computer, and the electronic device can also be a server, or a service cluster composed of multiple servers.

[0051] like Figure 1 As shown, Figure 1 This is a schematic diagram of an application scenario of the electrical equipment detection method in the embodiment of the present application. The application scenario of the electrical equipment detection method in the embodiment of the present application includes an electronic device 100, in which the electrical equipment detection method is integrated, and a computer-readable storage medium corresponding to the electrical equipment detection method is run in the electronic device 100 to execute the steps of the electrical equipment detection method.

[0052] Understandably, Figure 1The electronic devices in the application scenario of the electrical device detection method shown, or the devices included in the electronic devices, do not constitute a limitation on the embodiments of the present application, that is, the number of devices and types of devices included in the application scenario of the electrical device detection method, or the number of devices and types of devices included in each device do not affect the overall implementation of the technical solution in the embodiments of the present application, and can all be regarded as equivalent replacements or derivatives of the technical solution claimed to be protected by the embodiments of the present application.

[0053] The electronic device 100 in the embodiment of the present application may be an independent device, or a device network or device cluster composed of devices. For example, the electronic device 100 described in the embodiment of the present application includes but is not limited to a computer, a network host, a single network device, a plurality of network device sets or a cloud device composed of a plurality of devices. The cloud device is composed of a large number of computers or network devices based on cloud computing.

[0054] Those skilled in the art will understand that Figure 1 The application scenario shown in the figure is only an application scenario corresponding to the technical solution of the present application, and does not constitute a limitation on the application scenario of the technical solution of the present application. Other application scenarios may also include Figure 1 More or fewer electronic devices shown in, or electronic device network connection relationships, such as Figure 1 Only one electronic device is shown. It can be understood that the scenario of the electrical device detection method can also include one or more other electronic devices, which are not limited here. The electronic device 100 can also include a memory for storing information related to the electrical device detection method.

[0055] In addition, in the application scenario of the electrical equipment detection method in the embodiment of the present application, the electronic device 100 may be provided with a display device, or the electronic device 100 may not be provided with a display device and may be connected to an external display device 200 for communication, and the display device 200 is used to output the result of the execution of the electrical equipment detection method in the electronic device. The electronic device 100 may access a backend database 300, which may be a local memory of the electronic device 100, or may be provided in the cloud, and the backend database 300 may store information related to the electrical equipment detection method.

[0056] It should be noted that Figure 1 The application scenario of the electrical equipment detection method shown is merely an example. The application scenario of the electrical equipment detection method described in the embodiment of the present application is intended to more clearly illustrate the technical solution of the embodiment of the present application and does not constitute a limitation on the technical solution provided in the embodiment of the present application.

[0057] Secondly, based on the content of the aforementioned background technology of this application, the background of the application is further elaborated. When a short circuit occurs in the power transmission circuit, since it takes a certain amount of time for the circuit breaker to perform the switching operation, when the circuit breaker performs the switching operation, the short-circuit current affects the electrical life of the contact system (including the moving contact and the static contact) of the circuit breaker. At the moment when the circuit breaker has not yet been disconnected, the moving contact and the static contact produce arc erosion under the action of the electric repulsion generated by the short-circuit current, and a fused metal bridge may appear, thereby forming a pit on the surface of the moving contact and a puncture on the surface of the static contact. When the surfaces of the moving contact and the static contact of the circuit breaker are flat and the contact state is good, only a small contact resistance will be generated when the moving contact and the static contact are in contact. In the case of punctures and pits between the moving contact and the static contact, the appearance of punctures and pits will cause the pressure between the moving contact and the static contact to drop when they are in contact, and there may be a slight air gap, which increases the contact resistance between the moving contact and the static contact and forms a parasitic capacitor. The national standard defines the maximum contact resistance allowed for circuit breakers. As the number of circuit breaker switch operations increases, the puncture and pitting phenomena will become more and more serious, causing the equivalent impedance formed by the contact between the static contact and the moving contact to gradually increase, and eventually exceed the maximum contact resistance defined by the national standard. Therefore, in order to be able to test the performance of the circuit breaker online to avoid the problem of the contact resistance between the moving contact and the static contact of the circuit breaker exceeding the national standard, this application is proposed.

[0058] First, as Figure 2 As shown, in one embodiment, the present application provides a receiving end detection device, which includes a capacitive module 10 and a signal receiving module 20. The capacitive module 10 is connected to the first transmission line, the first transmission line is connected to the electrical device to be tested, and the capacitive module 10 and the electrical device to be tested form a low-pass filter structure; the low-pass filter structure is used to receive a reference carrier signal, and filter the reference carrier signal to obtain a test carrier signal; the signal receiving module 20 is connected to the capacitive module 10, and is used to receive the test carrier signal and generate the amplitude information of the test carrier signal, so that the terminal device generates the performance detection result of the circuit breaker according to the preset amplitude and amplitude information of the reference carrier signal.

[0059] As an example, the signal receiving module 20 may adopt a communication module that complies with the communication protocol of the HPLC (High-speed Power Line Communication) system, for example, the signal receiving module 20 may be a terminal station in the HPLC system, i.e., a STA (station) station. The reference carrier signal is a signal having a preset frequency and a preset amplitude output by a signal sending module that complies with the HPLC system, and the reference carrier signal is transmitted using a power transmission line as a carrier.

[0060] As an example, the low-pass filter structure is an RC low-pass filter, which includes a resistor part and a capacitor part. When the reference carrier signal is input into the low-pass filter structure, the resistor part and the capacitor part form a voltage divider network. Since the capacitor part has a large impedance to the high-frequency signal, it is equivalent to a short circuit, that is, the low-pass filter structure cannot transmit the high-frequency signal, so that the high-frequency signal in the reference carrier signal is filtered out. The capacitor part has a small impedance to the low-frequency signal, which is equivalent to a wire, that is, the low-pass filter structure can transmit the low-frequency signal.

[0061] As an example, the electrical device to be tested can be a circuit breaker, the output end of the circuit breaker is connected to the first transmission line, and the contacts of the circuit breaker and the capacitive module 10 constitute a low-pass filtering structure; the contacts of the circuit breaker include a moving contact and a static contact. Since the moving contact and the static contact of the circuit breaker are connected in series in the transmission line in a closed state, the contact resistance between the moving contact and the static contact of the circuit breaker and the resistance of the first transmission line constitute the resistance part in the low-pass filtering structure, and the capacitive module 10 connected between the live wire and the neutral wire of the first transmission line constitutes the capacitance part in the low-pass filtering structure.

[0062] Wherein, when the resistance of the first transmission line is ignored, the cutoff frequency of the low-pass filter structure is related to the contact resistance and the capacitance of the capacitive module 10, and the cutoff frequency can be expressed as fc=1 / 2πRC; wherein R represents the contact resistance; C represents the capacitance of the capacitive module 10. When the low-pass filter structure receives a reference carrier signal whose preset frequency is greater than or equal to the cutoff frequency, the test carrier signal output by the low-pass filter structure will have a greater attenuation relative to the reference carrier signal. When the low-pass filter structure receives a reference carrier signal whose preset frequency is less than the cutoff frequency, the test carrier frequency output by the low-pass filter structure remains basically unchanged or has only a small attenuation relative to the reference carrier signal. Since the capacitance of the capacitive module 10 constituting the low-pass filter structure is determined, as the contact resistance between the moving contact and the static contact of the circuit breaker increases, the cutoff frequency of the low-pass filter decreases. In this way, the reference carrier signal of different preset frequencies is received by the low-pass filtering structure for filtering to obtain the test carrier signal, and then the cutoff frequency is obtained by the attenuation of the test carrier signal of different preset frequencies, so as to obtain the contact resistance between the moving contact and the static contact, so as to obtain the performance test result of the circuit breaker.

[0063] In the above implementation, firstly, the capacitive module 10 is used to form a low-pass filter structure with the electrical device to be tested, so as to filter the filtered reference carrier signal through the low-pass filter structure to obtain a test carrier signal. Secondly, the signal receiving module 20 can identify the amplitude information of the test carrier signal, so that the terminal device can analyze the attenuation caused by the low-pass filter structure at the preset frequency point based on the preset amplitude of the reference carrier signal and the amplitude information of the test carrier signal, so as to generate the performance test result of the electrical device to be tested. Since the reference carrier signal uses the electrical signal on the transmission line as a carrier to realize the transmission of the reference carrier signal, and the transmission of the reference carrier signal does not affect the normal operation of the transmission line, there is no need to make the electrical device to be tested perform a switching operation, thereby realizing online detection of the performance of the electrical device to be tested.

[0064] In some embodiments, the electrical device to be tested may also be any electrical device with contacts, such as a contactor, a control and protection device, etc.

[0065] Reference Figure 2 As a further implementation of the receiving end detection device, the receiving end detection device also includes a first communication module 30; the first communication module 30 is connected to the signal receiving module 20 and the terminal device, and is used to receive amplitude information and send the amplitude information to the terminal device.

[0066] As an example, the first communication module 30 can be connected to the terminal device by wireless connection, for example, the first communication module 30 can be a Bluetooth module, so that the first communication module 30 and the terminal device are connected by Bluetooth connection. The connection between the first communication module 30 and the signal receiving module 20 can be wired.

[0067] In the above embodiment, the first communication module 30 is provided to facilitate communication between the signal receiving module 20 and the terminal device, to facilitate the terminal device to control the operation of the signal receiving module 20 through the first communication module 30, and to facilitate the signal receiving module 20 to send the amplitude information of the test carrier signal to the terminal device so that the terminal device can perform further analysis and processing.

[0068] Reference Figure 3 As an implementation of the capacitive module 10, the capacitive module 10 includes a capacitor C0; the capacitor C0 includes a first end connected to a live wire of any phase in the first transmission line and a second end connected to the signal receiving module 20 and a neutral wire in the first transmission line.

[0069] As an example, only one capacitor C0 may be provided, A, B and C represent the live wires of phase A, phase B and phase C respectively, and L represents the neutral wire, that is, the capacitor C0 is connected to any one of phase A, phase B and phase C of the first transmission line. Multiple capacitors C0 may also be provided, that is, multiple capacitors C0 are connected to phase A, phase B and phase C of the first transmission line respectively.

[0070] As an example, the connection mode of the capacitor C0 between the first transmission line and the signal receiving module 20 can be detachably arranged, for example, a first contact point connected to the first transmission line and a second contact point connected to the input end of the signal receiving module 20 are arranged, so that the first end of the capacitor C0 abuts the first contact point, and the second end of the capacitor C0 abuts the second contact point, so as to realize the connection of the capacitor C0 between the first transmission line and the signal receiving module 20. When the test carrier signals of all preset frequency points have a large attenuation, the accurate cut-off frequency cannot be obtained. At this time, the capacitor C0 with a smaller capacitance can be replaced to increase the cut-off frequency of the low-pass filter structure, so as to more accurately find the frequency interval when the test carrier signal begins to attenuate, so as to obtain a more accurate cut-off frequency.

[0071] In the above embodiment, by setting a capacitor C0 between the live wire and the neutral wire of the first transmission line, the reference carrier signal is filtered to obtain a test carrier signal, and the test carrier signal is transmitted to the signal receiving module 20, and the test carrier signal is further processed and analyzed to obtain the amplitude information of the test carrier signal.

[0072] Reference Figure 3 As a further implementation of the receiving end detection device, the receiving end detection device further includes a switch module disposed between the first power transmission line and the capacitive module 10, and the switch module is used to control the on-off between the first power transmission line and the capacitive module 10. The switch module includes a switch device, and the switch device includes a first end connected to the first power transmission line, a second end connected to the capacitive module 10, and a control end connected to the first communication module 30.

[0073] As an example, the switch device can be a semiconductor device with control function such as a thyristor or a transistor. For example, the thyristor includes a first end connected to the first transmission line, a second end connected to the capacitive module 10 and a control end connected to the first communication module 30.

[0074] In the above embodiment, an opening instruction or a closing instruction is sent to the switch module through the Bluetooth module to control the on and off of the switch module, so as to realize the on and off control between the first transmission line and the capacitive module 10. The switch module is kept disconnected before the test starts to avoid the electrical signal on the first transmission line from continuously flowing to the capacitive module 10 and causing loss.

[0075] Reference Figure 3 As a further implementation of the receiving end detection device, the receiving end detection device also includes a first three-phase interface, which is connected to the switch module to realize a detachable connection between the receiving end detection device and the interface set on the first transmission line, thereby facilitating the online installation of the receiving end detection device.

[0076] Second, refer to Figure 2 and Figure 4 In one embodiment, the present application provides a transmitting-end detection device that communicates with the above-mentioned receiving-end detection device, including a signal sending module; wherein the signal sending module is connected to a second transmission line, and is used to send a reference carrier signal with a preset amplitude to the second transmission line at a plurality of preset frequency points, so that the reference carrier signal is transmitted to a low-pass filtering structure through the second transmission line to obtain the amplitude information of the test carrier signal; wherein the amplitude information of the test carrier signal and the preset amplitude of the reference carrier signal are used to generate a performance detection result of the electrical equipment to be tested.

[0077] As an example, the input terminal of the electrical device under test is connected to the second power transmission line. For example, when the electrical device under test is a circuit breaker, the input terminal of the circuit breaker is connected to the second power transmission line.

[0078] As an example, the signal sending module can adopt a communication module that complies with the HPLC system communication protocol. For example, the signal sending module can be a CCO (Central Coordination Office) site or a PCO (Proxy Coordination Office) site in the HPLC system. In the HPLC system, the CCO site and the PCO site are the superior sites of the STA site and can communicate directly with the STA site. Therefore, the signal sending module adopts the CCO site or the PCO site without repeatedly establishing communication with the signal receiving module 20, which is easier to implement.

[0079] As an example, the preset frequency point can be a frequency point supported by the signal sending module. For example, when the sending module adopts a CCO site or a PCO site, the CCO site or the PCO site supports multiple frequency bands including 2M~12MHz, 2.4MHz~5.6MHz, 0.7~2.9MHz, etc. For example, the range of the preset frequency point can be set to 2MHz to 12MHz, and the interval of the preset frequency point can be set to 1MHz, that is, the preset frequency points include 2MHz, 2MHz, 3MHz, 4MHz, 5MHz, 6MHz, 7MHz, 8MHz, 9MHz, 10MHz, 11MHz and 12MHz, a total of 11 frequency points. The range and interval of the preset frequency points can be set according to actual conditions and are not limited here.

[0080] Reference Figure 4 As a further implementation of the transmitting-end detection device, the transmitting-end detection device also includes a second communication module connected to the signal sending module and the terminal device; wherein the second communication module is used to receive a sending instruction output by the terminal device, and output the sending instruction to the signal sending module to control the signal sending module to output a reference carrier signal with a preset amplitude to the second transmission line at each preset frequency point.

[0081] In the above implementation, the sending instruction output by the terminal device is transmitted to the signal sending module through the second communication module, and then the signal sending module is used to send the reference carrier signal at different preset frequency points, and the reference carrier signal of each preset frequency point is filtered in combination with the low-pass filtering structure to obtain the test carrier signal, so as to generate the performance detection result of the circuit breaker according to the amplitude information of the test carrier signal and the preset amplitude of the reference carrier signal.

[0082] Reference Figure 4 As a further implementation of the sending-end detection device, the sending-end detection device also includes a second three-phase port, and the second three-phase interface is connected to the signal sending module, which is used to realize a detachable connection between the sending-end detection device and the interface set on the second transmission line, thereby facilitating the online installation of the sending-end detection device.

[0083] In a third aspect, in one embodiment, referring to Figure 5 The present application provides an electrical equipment detection method, which is applied to a terminal device. The terminal device is communicatively connected with the above-mentioned receiving end detection device and the above-mentioned sending end detection device. The method includes steps S101 to S103, which are described in detail below.

[0084] Step S101: obtaining the preset amplitude of the reference carrier signal at each preset frequency point and the amplitude information of the corresponding test carrier signal.

[0085] Step S102: generating an attenuation amplitude corresponding to each preset frequency point according to the preset amplitude and amplitude information at each preset frequency point.

[0086] Step S103: Generate a performance test result according to the attenuation amplitude corresponding to each preset frequency point.

[0087] As an example, if the attenuation amplitude corresponding to each preset frequency point is less than the preset attenuation threshold, it means that the cutoff frequency of the low-pass filtering structure is not within the frequency band covered by each preset frequency point, that is, the cutoff frequency is greater than the maximum frequency of the frequency band covered by each preset frequency point. According to the cutoff frequency formula of the low-pass filter, when the capacitance of the capacitive module 10 is determined, the larger the cutoff frequency, the smaller the contact resistance between the moving contact and the static contact, which means that the contact between the moving contact and the static contact is good, thereby generating the performance test result of the circuit breaker.

[0088] In the above implementation, the preset amplitude of the reference carrier signal at each preset frequency point and the amplitude information of the test carrier signal after transmission through the low-pass filter structure are first obtained, and then the preset amplitude and amplitude information at each preset frequency point are used to calculate the attenuation amplitude corresponding to each preset frequency point, so as to analyze the cutoff frequency of the low-pass filter structure, so as to generate the performance test result of the circuit breaker through the cutoff frequency.

[0089] As an implementation of step S103, step S103 includes steps S1031 to S1033, which are described in detail below: Step S1031: Determine whether there is an attenuation amplitude greater than a preset attenuation threshold; if yes, execute step S1032; if no, execute step S1033.

[0090] As an example, the preset attenuation threshold can be set to 3dB. An attenuation amplitude of 3dB indicates that the test carrier signal is attenuated to half of the reference carrier signal. At this time, the low-pass filter structure has performed a relatively obvious high-frequency filtering on the reference carrier signal, that is, the preset frequency point where the reference filter signal is located is close to the cutoff frequency of the low-pass filter structure.

[0091] Step S1032: Generate abnormal performance detection results of the electrical equipment to be tested.

[0092] Step S1033: Generate a normal performance test result of the electrical device to be tested.

[0093] In the above implementation, by setting a suitable preset attenuation threshold, the cutoff frequency interval of the low-pass filter structure can be quickly and accurately determined, so as to obtain the performance detection result of the circuit breaker.

[0094] Reference Figure 6 As a further implementation of the electrical equipment detection method, after step S1032, it also includes steps S201 to S203, which are described in detail below.

[0095] Step S201: performing interpolation processing on the attenuation amplitude corresponding to each preset frequency point to obtain an attenuation curve; wherein the attenuation curve is a corresponding relationship curve between frequency and attenuation amplitude;

[0096] Step S202: taking the frequency corresponding to the preset attenuation threshold in the attenuation curve as the cutoff frequency of the low-pass filter structure.

[0097] Step S203: Acquire the capacitance of the capacitive module 10, and generate the equivalent impedance of the electrical device to be tested according to the capacitance and the cut-off frequency.

[0098] Combination Figure 7 , Figure 7It is a schematic diagram of the attenuation curve. Ignoring the capacitance of the capacitive module 10, the equivalent impedance of the electrical equipment to be tested can be expressed as R = 1 / (2πfc); wherein fc represents the cutoff frequency; taking the preset attenuation threshold of 3dB as an example, when the preset frequency is 2MHz, the attenuation amplitude is about 2dB, and when the preset frequency is 3MHz, the attenuation amplitude is 3.5dB. Therefore, it can be seen from the attenuation curve that when the attenuation amplitude is 3dB, the preset frequency is about 2.7MHz, and the contact resistance is calculated to be about 18 milliohms. When the circuit breaker performs well, the contact resistance is usually about tens of microohms, indicating that the circuit breaker is obviously aged at this time.

[0099] As a further implementation of the electrical equipment detection method, the electrical equipment detection method further includes steps S301 and S302, which are described in detail below.

[0100] Step S301: receiving an external control instruction, and determining each preset frequency point and a preset amplitude of a reference carrier signal according to the external control instruction.

[0101] Step S302: Generate a sending instruction according to each preset frequency point and preset amplitude, and output the sending instruction to the sending end detection device to control the sending end detection device to output a reference carrier signal at each preset frequency point.

[0102] In a fourth aspect, in one embodiment, the present application provides an electronic device, such as Figure 8 As shown, it shows the structure of the electronic device involved in this application, specifically:

[0103] The electronic device may include components such as a processor 401 with one or more processing cores, a memory 402 with one or more computer-readable storage media, a power supply 403, and an input unit 404. Those skilled in the art will appreciate that Figure 5 The structure of the electronic device shown in the figure does not constitute a limitation on the electronic device, and may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0104] The processor 401 is the control center of the electronic device, which uses various interfaces and lines to connect various parts of the entire electronic device, and executes various functions of the electronic device and processes data by running or executing software programs and / or modules stored in the memory 402, and calling data stored in the memory 402, so as to monitor the electronic device as a whole. Optionally, the processor 401 may include one or more processing cores; preferably, the processor 401 may integrate an application processor and a modem processor, wherein the application processor mainly processes the operating system, user interface and computer programs, etc., and the modem processor mainly processes wireless communications. It is understandable that the above-mentioned modem processor may not be integrated into the processor 401.

[0105] The memory 402 can be used to store software programs and modules. The processor 401 executes various functional applications and data processing by running the software programs and modules stored in the memory 402. The memory 402 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, a computer program required for at least one function (such as a sound playback function, an image playback function, etc.), etc.; the data storage area may store data created according to the use of the server, etc. In addition, the memory 402 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage devices. Accordingly, the memory 402 may also include a memory controller to provide the processor 401 with access to the memory 402.

[0106] The electronic device also includes a power supply 403 for supplying power to each component. Preferably, the power supply 403 can be logically connected to the processor 401 through a power management system, so as to manage charging, discharging, power consumption and other functions through the power management system. The power supply 403 can also include one or more DC or AC power supplies, recharging systems, power failure detection circuits, power converters or inverters, power status indicators and other arbitrary components.

[0107] The electronic device may further include an input unit 404, which may be used to receive input digital or character information and generate keyboard, mouse, joystick, optical or trackball signal input related to user settings and function control.

[0108] Although not shown, the electronic device may further include a display unit, etc., which will not be described in detail herein. Specifically in this embodiment, when the electronic device is a model training electronic device, the processor 401 in the electronic device will load the executable files corresponding to the processes of one or more computer programs into the memory 402 according to the following instructions, and the processor 401 will run the computer program stored in the memory 402 to execute the steps of the electrical device detection method as described above.

[0109] A person of ordinary skill in the art will appreciate that all or part of the steps in any of the methods of the above embodiments may be completed by a computer program, or by controlling related hardware through a computer program. The computer program may be stored in a computer-readable storage medium and loaded and executed by a processor.

[0110] In a fifth aspect, in one embodiment, the present application provides a storage medium storing a plurality of computer programs, which can be loaded by a processor to execute the steps of the electrical equipment detection method as described above.

[0111] It will be appreciated by those skilled in the art that any reference to memory, storage, database or other medium used in the embodiments provided herein may include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in a variety of forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink), DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0112] Since the computer program stored in the storage medium can execute the steps in the receiving-end detection device in any one of the embodiments provided in the present application, the beneficial effects that can be achieved by the receiving-end detection device in any one of the embodiments provided in the present application can be achieved. Please refer to the previous embodiments for details and will not be repeated here.

[0113] The specific implementation of the above operations can be found in the previous embodiments, which will not be described in detail here.

[0114] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the detailed description of other embodiments above, and will not be repeated here.

[0115] The above is a detailed introduction to the receiving end detection device, the transmitting end detection device and the electrical equipment detection method provided by the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

[0116] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

Claims

1. A receiving end detection device, characterized in that: include: A capacitive module connected to the first power transmission line; The first power transmission line is connected to the electrical device to be tested, and the capacitive module and the electrical device to be tested form a low-pass filter structure; The low-pass filter structure is used to receive a reference carrier signal and filter the reference carrier signal to obtain a test carrier signal; A signal receiving module is connected to the capacitive module, and is used to receive the test carrier signal and generate amplitude information of the test carrier signal, so that the terminal device generates a performance detection result of the electrical device to be tested according to the preset amplitude of the reference carrier signal and the amplitude information.

2. The receiving end detection device according to claim 1, characterized in that: The electrical device to be tested is a circuit breaker; the output end of the circuit breaker is connected to the first power transmission line; The contacts of the circuit breaker and the capacitive module constitute the low-pass filtering structure.

3. The receiving end detection device according to claim 1, characterized in that: Also includes a first communication module; The first communication module is connected to the signal receiving module and the terminal device, and is used to receive the amplitude information and send the amplitude information to the terminal device.

4. The receiving end detection device according to claim 1, characterized in that: The capacitive module includes a capacitor; The capacitor comprises a first end connected to a live line of any one phase in the first power transmission line and a second end connected to the signal receiving module and a neutral line in the first power transmission line.

5. The receiving end detection device according to claim 3, characterized in that: It also includes a switch module disposed between the first power transmission line and the capacitive module, the switch module being used to control the on-off between the first power transmission line and the capacitive module; The switch module includes a switch device, and the switch device includes a first end connected to the first power transmission line, a second end connected to the capacitive module, and a control end connected to the first communication module.

6. A transmitting end detection device, communicating with the receiving end detection device according to any one of claims 1 to 5, characterized in that: include: a signal sending module, connected to the second power transmission line, for sending reference carrier signals with preset amplitudes to the second power transmission line at a plurality of preset frequency points, so that the reference carrier signals are transmitted to the low-pass filter structure through the second power transmission line to obtain amplitude information of the test carrier signal; The amplitude information of the test carrier signal and the preset amplitude of the reference carrier signal are used to generate the performance detection result of the electrical device to be tested.

7. The transmitting end detection device according to claim 6, characterized in that: The electrical device to be tested is a circuit breaker; An input terminal of the circuit breaker is connected to the second power transmission line.

8. The transmitting end detection device according to claim 6, characterized in that: Also includes a second communication module connected to the signal sending module and the terminal device; The second communication module is used to receive the sending instruction output by the terminal device, and output the sending instruction to the signal sending module to control the signal sending module to output the reference carrier signal with a preset amplitude to the second transmission line at each preset frequency point.

9. An electrical equipment detection method, applied to a terminal device, wherein the terminal device is communicatively connected with a receiving end detection device according to any one of claims 1 to 5 and a transmitting end detection device according to any one of claims 6 to 8, characterized in that: The method comprises: Obtaining the preset amplitude of the reference carrier signal at each preset frequency point and the amplitude information of the corresponding test carrier signal; Generate an attenuation amplitude corresponding to each of the preset frequencies according to the preset amplitude and the amplitude information at each of the preset frequencies; A performance test result is generated according to the attenuation amplitude corresponding to each of the preset frequency points.

10. The electrical equipment detection method according to claim 9, characterized in that: Generating the performance test result according to the corresponding attenuation amplitude of each of the preset frequency points includes: Determine whether there is an attenuation amplitude greater than a preset attenuation threshold; If so, generating a performance test result indicating that the electrical device under test is abnormal; If not present, a normal performance test result of the electrical device to be tested is generated.

11. The electrical equipment detection method according to claim 10, characterized in that: After generating the abnormal performance detection result of the electrical equipment to be tested, the method further includes: Performing interpolation processing on the attenuation amplitude corresponding to each of the preset frequency points to obtain an attenuation curve; wherein the attenuation curve is a corresponding relationship curve between frequency and attenuation amplitude; Using the frequency corresponding to the preset attenuation threshold in the attenuation curve as the cutoff frequency of the low-pass filter structure; The capacitance of the capacitive module is obtained, and the equivalent impedance of the electrical device to be tested is generated according to the capacitance and the cut-off frequency.

12. The electrical equipment detection method according to claim 9, characterized in that: Also includes: Receiving an external control instruction, and determining each of the preset frequency points and the preset amplitude of the reference carrier signal according to the external control instruction; A sending instruction is generated according to each of the preset frequency points and the preset amplitude, and the sending instruction is output to the sending end detection device.

Images