Method, device and equipment for monitoring the off state of a snap-on current transformer and medium

Abstract

The application discloses a buckle type current transformer falling-off state monitoring method, device, equipment and medium, and belongs to the field of low-voltage power metering devices and low-voltage power distribution. The method comprises the following steps: receiving a physical contact state uploaded by a buckle type current transformer; injecting a characteristic current signal into a primary side branch outgoing line of the buckle type current transformer according to a preset time period or when the physical contact state is disconnected, and receiving a characteristic signal strength collected from a secondary side winding of the buckle type current transformer and demodulated; if the characteristic current signal is injected with the time period as a trigger condition, then generating a falling-off state monitoring result according to the physical contact state and the characteristic signal strength; and if the characteristic current signal is injected with the physical contact state as a trigger condition, then generating a falling-off state monitoring result according to the characteristic signal strength. Therefore, the application can improve the accuracy of the buckle type current transformer falling-off state monitoring.

Description

Technical Field

[0001] This invention relates to the field of low-voltage power metering devices and low-voltage power distribution, and particularly to a method, device, equipment and medium for monitoring the detachment status of a snap-on current transformer. Background Technology

[0002] Clip-on current transformers are widely used in branch load monitoring scenarios in low-voltage distribution area transparency upgrade projects due to their advantages of convenient installation and the ability to complete on-site construction without power outages. Specifically, an intelligent measurement terminal is installed on the secondary side of the transformer. Through the branch monitoring module on the terminal, in conjunction with the clip-on current transformer installed on the low-voltage branch outgoing line, real-time monitoring of the branch line load current is achieved, providing data support for distribution area line loss analysis, power outage event judgment, and load balancing management.

[0003] However, in practical applications, the snap-fit ​​current transformer's structure, which relies on plastic snap-fit ​​locking, presents certain mechanical risks. During long-term operation, factors such as thermal expansion and contraction, and equipment vibration (e.g., switch opening and closing) can cause the plastic snap-fit ​​to age and break, leading to the transformer detaching or partially detaching. Furthermore, improper installation during on-site construction, or unauthorized removal without notifying the maintenance unit, can also cause the transformer to malfunction. More seriously, if the secondary side of the transformer is open-circuited, high voltage may be generated, endangering personal and equipment safety.

[0004] Currently, the detection of detached snap-on current transformers mainly relies on manual inspections. When maintenance personnel discover abnormal branch current data (such as zero current) on the system, they go to the site to investigate and confirm; or they conduct on-site inspections at fixed intervals, manually judging whether the transformer has detached. This method has the following problems: First, it is inefficient and cannot detect potential problems in a timely manner, especially for internal semi-loose states that are difficult to judge with the naked eye; second, it affects data application, as both transformer detachment and branch line power outages show zero current in the data, which can easily lead to misjudgments and affect the accurate judgment of branch power outage events by staff; third, it poses safety hazards, as open circuits on the secondary side, if not detected in time, may lead to safety accidents. Summary of the Invention

[0005] This invention provides a method, apparatus, equipment, and medium for monitoring the detachment status of a snap-fit ​​current transformer, which can improve the accuracy of monitoring the detachment status of the snap-fit ​​current transformer.

[0006] This invention provides a method for monitoring the detachment status of a snap-on current transformer, comprising: Receive the physical contact status uploaded by the snap-on current transformer; wherein, the physical contact status is detected by a flexible conductive detection switch disposed on the conductive contact surface of the snap-on current transformer; According to a preset time period, or when the physical contact is open, a characteristic current signal is injected into the primary side branch line of the snap-on current transformer, and the characteristic signal intensity is received and demodulated from the secondary winding of the snap-on current transformer; wherein, the characteristic signal intensity is generated by the characteristic current signal in the snap-on current transformer. If the characteristic current signal is injected with the time period as the trigger condition, then the dislodgement status monitoring result of the snap-on current transformer is generated based on the physical contact state and the intensity of the characteristic signal. If the characteristic current signal is injected with the physical contact state as the trigger condition, then the detachment status monitoring result of the snap-on current transformer is generated based on the intensity of the characteristic signal.

[0007] This invention, by receiving the physical contact status detected by a flexible conductive detection switch, can convert the mechanical conduction state of the snap-fit ​​structure into a recognizable electrical signal. By injecting a characteristic current signal according to a preset time period or when the physical contact state is open and receiving the demodulated characteristic signal strength, a dual detection mechanism based on time-driven and event-driven methods can be established, improving the robustness of the monitoring results. By generating monitoring results based on the physical contact status and characteristic signal strength in the time-period trigger mode, physical status can be introduced as a judgment criterion in electrical detection, enriching the dimensions of fault diagnosis. By generating monitoring results based on the characteristic signal strength in the physical contact open trigger mode, the electrical coupling state can be verified under the premise of known physical contact anomalies, improving the accuracy of detachment judgment. Compared with the prior art that relies on manual inspection, this application can improve the accuracy of monitoring the detachment state of snap-fit ​​current transformers.

[0008] Furthermore, the physical contact status transmitted by the receiving snap-on current transformer includes: The MCU outputs a detection level to the detection circuit; wherein, the detection circuit consists of the upper and lower semicircular rings of the snap-on current transformer and the flexible conductive detection switch; The voltage level is read through the MCU's I / O port, and the physical contact status is generated and uploaded based on the voltage level.

[0009] This invention, through the MCU outputting a detection level to the detection circuit and reading the IO port level value, can convert the mechanical conduction state of the snap-fit ​​structure into a digital level signal, thereby realizing the digital acquisition and uploading of the physical contact state.

[0010] Further, the step of generating and uploading the physical contact status based on the level value includes: When the read level value is zero, the generated and uploaded physical contact status is on; When the level value read is the same as the level value of the detected level, the physical contact status generated and uploaded is disconnected.

[0011] This invention generates the on or off physical contact state based on the read level value, which maps the mechanical conduction status of the snap-fit ​​structure to a logical state, providing a basis for subsequent judgment.

[0012] Further, the step of injecting a characteristic current signal into the primary side branch line of the snap-on current transformer according to a preset time period, or when the physical contact is open, and receiving the characteristic signal strength acquired and demodulated from the secondary winding of the snap-on current transformer, includes: According to a preset time period, or when the physical contact is open, a characteristic current signal is injected into the primary side branch line so that the secondary winding of the snap-on current transformer generates a response signal. The response signal is demodulated to obtain the characteristic signal intensity.

[0013] The embodiments of the present invention can extract the characteristic signal intensity of a specific frequency from a complex current signal and eliminate background noise interference by demodulating the secondary response signal after injecting a characteristic current signal.

[0014] Further, if the characteristic current signal is injected with the time period as the trigger condition, then the monitoring result of the disengagement status of the snap-on current transformer is generated based on the physical contact state and the intensity of the characteristic signal, including: The intensity of the characteristic signal is compared with a preset intensity threshold; If the intensity of the characteristic signal is greater than or equal to the intensity threshold, the snap-on current transformer is determined to be normal and no detachment status monitoring result is generated. If the intensity of the characteristic signal is less than the intensity threshold, then the detachment status monitoring result of the snap-on current transformer is generated based on the physical contact status and the intensity of the characteristic signal.

[0015] By comparing the intensity of a characteristic signal with a preset threshold, this invention can quickly filter out operating conditions with normal signal intensity, thereby improving monitoring efficiency.

[0016] Further, if the intensity of the characteristic signal is less than the intensity threshold, then generating a monitoring result of the detachment status of the snap-on current transformer based on the physical contact state and the intensity of the characteristic signal includes: If the intensity of the characteristic signal is zero and the physical contact is open, the generated detachment status monitoring result is that the snap-on current transformer has detached. If the intensity of the characteristic signal is zero and the physical contact is in a conducting state, the generated detachment status monitoring result is that the secondary side of the snap-on current transformer is open. If the intensity of the characteristic signal is not equal to zero and the physical contact state is on, then the generated detachment status monitoring result is that the snap-on current transformer is not fully on.

[0017] This invention combines the determination of whether the characteristic signal strength is zero and whether the physical contact is conductive to automatically distinguish three different fault states: detachment, secondary side open circuit, and incomplete conduction.

[0018] Further, if the characteristic current signal is injected based on the physical contact state as a trigger condition, then the monitoring result of the detachment state of the snap-on current transformer is generated according to the intensity of the characteristic signal, including: The intensity of the feature signal is compared with the intensity threshold. If the intensity of the characteristic signal is greater than or equal to the intensity threshold, the generated detachment status monitoring result is that the physical contact of the snap-on current transformer is damaged. If the intensity of the characteristic signal is less than the intensity threshold, the generated detachment status monitoring result is that the snap-on current transformer has detached.

[0019] This invention generates monitoring results by comparing the intensity of the characteristic signal with a threshold when the physical contact is disconnected and injection is triggered. This allows for reverse verification of whether the physical contact detection process itself has malfunctioned.

[0020] Another embodiment of the present invention provides a snap-on current transformer detachment status monitoring device, comprising: a physical contact detection module, a feature signal detection module, a first result generation module, and a second result generation module; The physical contact detection module is used to receive the physical contact status uploaded by the snap-on current transformer; wherein, the physical contact status is detected by a flexible conductive detection switch disposed on the conductive contact surface of the snap-on current transformer. The feature signal detection module is used to inject a feature current signal into the primary branch line of the snap-on current transformer according to a preset time period or when the physical contact is open, and to receive the feature signal intensity collected and demodulated from the secondary winding of the snap-on current transformer; wherein the feature signal intensity is generated by the feature current signal induced in the snap-on current transformer. The first result generation module is used to generate a monitoring result of the detachment status of the snap-on current transformer based on the physical contact status and the intensity of the characteristic signal if the characteristic current signal is injected with the time period as the trigger condition. The second result generation module is used to generate a detection result of the detachment status of the snap-on current transformer based on the intensity of the characteristic signal if the characteristic current signal is injected with the physical contact state as the trigger condition.

[0021] Another embodiment of the present invention provides a terminal device, including: a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, it implements the steps of a snap-on current transformer disconnection status monitoring method as described in the present invention.

[0022] Another embodiment of the present invention also provides a computer-readable storage medium item, including: a stored computer program, which, when the computer program is running, controls the device where the computer-readable storage medium is located to perform the steps of a snap-on current transformer disconnection status monitoring method of the present invention. Attached Figure Description

[0023] Figure 1 A flowchart illustrating an embodiment of the snap-on current transformer detachment status monitoring method provided by the present invention; Figure 2 This is a schematic diagram of a snap-on current transformer with a flexible conductive detection switch provided by the present invention. Figure 3 A flowchart illustrating one embodiment of the snap-on current transformer installation method provided by the present invention; Figure 4 A flowchart illustrating another embodiment of the snap-on current transformer detachment monitoring method provided by the present invention; Figure 5 A schematic diagram of an embodiment of the snap-on current transformer detachment status monitoring system provided by the present invention; Figure 6 This is a schematic diagram of one embodiment of the snap-on current transformer detachment status monitoring device provided by the present invention. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0026] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0027] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0028] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0029] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0030] See Figure 1 To address the problem of existing technologies relying on manual inspection, an embodiment of the present invention provides a method for monitoring the detachment status of a snap-on current transformer, including steps S101 to S104: Step S101: Receive the physical contact status uploaded by the snap-on current transformer; wherein the physical contact status is detected by a flexible conductive detection switch disposed on the conductive contact surface of the snap-on current transformer.

[0031] It should be noted that receiving the physical contact status uploaded by the snap-fit ​​current transformer refers to receiving the physical contact status sent by the snap-fit ​​current transformer. This physical contact status is detected by a flexible conductive detection switch embedded in the conductive contact surface of the upper and lower semicircular rings of the snap-fit ​​current transformer: when the snap-fit ​​is normally conductive, the conductive rubber of the upper and lower semicircular rings are in contact with each other, the detection circuit is conductive, a low level is read, and a physical contact status of conductive state is generated and uploaded; when the snap-fit ​​is disconnected or detached, the conductive rubber separates, the detection circuit is open, a high level is read, and a physical contact status of disconnected state is generated and uploaded. This physical contact status reflects the actual mechanical conductivity of the snap-fit ​​structure of the snap-fit ​​current transformer, providing a physical basis for subsequent dual verification judgment.

[0032] Preferably, the physical contact status transmitted by the receiving snap-on current transformer includes: The MCU outputs a detection level to the detection circuit; wherein, the detection circuit consists of the upper and lower semicircular rings of the snap-on current transformer and the flexible conductive detection switch; The voltage level is read through the MCU's I / O port, and the physical contact status is generated and uploaded based on the voltage level.

[0033] Preferably, the step of generating and uploading the physical contact status based on the level value includes: When the read level value is zero, the generated and uploaded physical contact status is on; When the level value read is the same as the level value of the detected level, the physical contact status generated and uploaded is disconnected.

[0034] In one embodiment, a flexible conductive detection switch is pre-embedded at the conductive contact surface of the upper and lower semicircular rings of the snap-fit ​​current transformer, specifically at the following locations: Figure 2 As shown. When the snap-fit ​​structure is normally conductive, the upper and lower semi-circular rings are in close contact, compressing the conductive rubber and forming a low-voltage detection circuit. The MCU inside the detachment detection device continuously outputs a preset detection level (e.g., 3.3V) to this detection circuit through a pull-up resistor. When the MCU's I / O port reads a low level (0V), the detection circuit is conductive, and the physical contact state of the snap-fit ​​current transformer is determined to be conductive; when the MCU's I / O port reads a high level (3.3V), the detection circuit is open, and the physical contact state of the snap-fit ​​current transformer is determined to be open.

[0035] Step S102: According to a preset time period, or when the physical contact is open, inject a characteristic current signal into the primary side branch line of the snap-on current transformer, and receive the characteristic signal intensity obtained by collecting and demodulating the secondary winding of the snap-on current transformer; wherein, the characteristic signal intensity is generated by the characteristic current signal induced in the snap-on current transformer.

[0036] It should be noted that injecting a characteristic current signal into the primary side branch of the snap-fit ​​current transformer according to a preset time period, or when the physical contact is open, and receiving the characteristic signal strength collected and demodulated from the secondary winding of the snap-fit ​​current transformer, means that the characteristic current signal injection detection process is executed when one of two triggering conditions is met. The first triggering condition is timed triggering according to a preset time period; the second triggering condition is triggering when the physical contact is open. After triggering, a characteristic current signal with a specific frequency and code is injected into the primary side branch of the snap-fit ​​current transformer. This characteristic current signal propagates along the power line, is induced by the iron core of the snap-fit ​​current transformer, and generates a response signal in the secondary winding. This response signal is collected and demodulated to extract the characteristic signal strength. This characteristic signal strength reflects the transmission efficiency of the characteristic current signal coupling from the primary side to the secondary side and is used to determine the electrical coupling state of the snap-fit ​​current transformer.

[0037] Preferably, the step of injecting a characteristic current signal into the primary side branch of the snap-on current transformer according to a preset time period, or when the physical contact is open, and receiving the characteristic signal strength acquired and demodulated from the secondary winding of the snap-on current transformer, includes: According to a preset time period, or when the physical contact is open, a characteristic current signal is injected into the primary side branch line so that the secondary winding of the snap-on current transformer generates a response signal. The response signal is demodulated to obtain the characteristic signal intensity.

[0038] In one embodiment, according to a preset time period, or when the physical contact is open, a high-frequency (e.g., 833Hz) characteristic current signal is injected into the primary side branch line where the snap-on current transformer is installed through the carrier module coupling circuit of the energy meter; wherein, the process of installing the snap-on current transformer on the primary side branch line is as follows: Figure 3As shown, the response signal generated by the secondary winding of the snap-fit ​​current transformer is acquired through the branch monitoring module, and the characteristic signal intensity in the 833Hz frequency band is demodulated. The sampling function of the snap-fit ​​current transformer is judged by comparing the characteristic signal intensity through the intelligent measurement terminal: if the snap-fit ​​current transformer is locked and working normally, the magnetic circuit is conductive, and the mutual inductance is strong, then the characteristic signal intensity is greater than the preset threshold; if the snap-fit ​​current transformer is detached (iron core separation), the magnetic circuit is broken, and the mutual inductance is extremely weak or even disappears, then the characteristic signal intensity is less than the preset threshold or equal to zero.

[0039] Step S103: If the characteristic current signal is injected with the time period as the trigger condition, then the detachment status monitoring result of the snap-on current transformer is generated based on the physical contact state and the characteristic signal intensity.

[0040] It should be noted that if the characteristic current signal is injected with the time period as the trigger condition, then generating the disengagement monitoring result of the snap-fit ​​current transformer based on the physical contact state and the characteristic signal intensity means that when the characteristic current signal injection detection is triggered by the arrival of a preset time period, the currently acquired physical contact state and characteristic signal intensity are combined as the judgment basis to generate the monitoring result. Specifically, the characteristic signal intensity is compared with a preset threshold: if the characteristic signal intensity is greater than or equal to the threshold, it indicates that the electrical coupling is normal. At this time, combined with the physical contact state being conductive, it can be determined that the snap-fit ​​current transformer is working normally, and no disengagement-related monitoring result is generated; if the characteristic signal intensity is less than the threshold, further judgment is made based on the physical contact state. When the characteristic signal intensity is zero and the physical contact state is open, a disengagement result is generated; when the characteristic signal intensity is zero and the physical contact state is conductive, a secondary side open circuit result is generated; when the characteristic signal intensity is not zero and the physical contact state is conductive, an incomplete conductive result is generated. This step introduces the physical contact status as an auxiliary judgment dimension, enabling the discovery of hidden faults that cannot be identified by physical detection during scheduled inspections.

[0041] Preferably, if the characteristic current signal is injected with the time period as the trigger condition, then generating the disengagement status monitoring result of the snap-on current transformer based on the physical contact state and the intensity of the characteristic signal includes: The intensity of the characteristic signal is compared with a preset intensity threshold; If the intensity of the characteristic signal is greater than or equal to the intensity threshold, the snap-on current transformer is determined to be normal and no detachment status monitoring result is generated. If the intensity of the characteristic signal is less than the intensity threshold, then the detachment status monitoring result of the snap-on current transformer is generated based on the physical contact status and the intensity of the characteristic signal.

[0042] Preferably, if the intensity of the characteristic signal is less than the intensity threshold, generating a monitoring result of the detachment status of the snap-on current transformer based on the physical contact state and the intensity of the characteristic signal includes: If the intensity of the characteristic signal is zero and the physical contact is open, the generated detachment status monitoring result is that the snap-on current transformer has detached. If the intensity of the characteristic signal is zero and the physical contact is in a conducting state, the generated detachment status monitoring result is that the secondary side of the snap-on current transformer is open. If the intensity of the characteristic signal is not equal to zero and the physical contact state is on, then the generated detachment status monitoring result is that the snap-on current transformer is not fully on.

[0043] In one embodiment, a characteristic current signal injection detection process is initiated every fixed time interval (e.g., one hour). A command is sent to the electricity meter on the primary side branch line through the intelligent measurement terminal, so that the carrier module of the electricity meter generates an coded characteristic current signal on the primary side branch line. The signal is sampled by the snap-on current transformer, demodulated by the branch monitoring module, and the characteristic signal strength under the preset frequency band is extracted. The intelligent measurement terminal compares the strength of the characteristic signal with a preset threshold: if the characteristic signal strength is greater than or equal to the preset threshold, the intelligent measurement terminal does not output a disconnection status monitoring result; if the characteristic signal strength is zero and the physical contact is open, the intelligent measurement terminal outputs a disconnection status for the snap-fit ​​current transformer, i.e., the generated disconnection status monitoring result is that the snap-fit ​​current transformer is disconnected; if the characteristic signal strength is zero and the physical contact is closed, the intelligent measurement terminal outputs an open-circuit status for the secondary side of the snap-fit ​​current transformer, i.e., the generated disconnection status monitoring result is that the secondary side of the snap-fit ​​current transformer is open; if the characteristic signal strength is greater than zero and less than the preset threshold, and the physical contact is closed, the intelligent measurement terminal outputs a partially closed status for the snap-fit ​​current transformer, i.e., the generated disconnection status monitoring result is that the snap-fit ​​current transformer is not fully conductive, requiring on-site verification. The overall process is as follows: Figure 4 The right half of the image is shown.

[0044] Step S104: If the characteristic current signal is injected with the physical contact state as the trigger condition, then the detachment status monitoring result of the snap-on current transformer is generated based on the intensity of the characteristic signal.

[0045] It should be noted that if the characteristic current signal is injected based on the physical contact state as a trigger condition, then generating the monitoring result of the detachment state of the snap-fit ​​current transformer based on the characteristic signal strength means that when the characteristic current signal injection detection is triggered by the physical contact state being open, the characteristic signal strength is used as the judgment basis to generate the monitoring result. Specifically, the characteristic signal strength is compared with a preset threshold: if the characteristic signal strength is greater than or equal to the threshold, it indicates that although the physical contact state is open, the electrical coupling of the snap-fit ​​current transformer is still normal, that is, the characteristic current signal can be effectively coupled from the primary side to the secondary side and detected. At this time, it is determined that the physical contact detection unit itself may be faulty, and a monitoring result of physical contact damage is generated; if the characteristic signal strength is less than the threshold, it indicates that the electrical coupling has failed, and the characteristic current signal cannot be effectively transmitted. At this time, combined with the known physical contact state being open, it is confirmed that the snap-fit ​​current transformer is indeed in a detached state, and a detachment monitoring result is generated. This step, by initiating characteristic current detection when the physical contact is abnormal, can verify the reliability of the physical detection result and distinguish between two different fault causes: actual detachment and physical contact damage.

[0046] Preferably, if the characteristic current signal is injected based on the physical contact state as a trigger condition, then generating the disengagement status monitoring result of the snap-on current transformer based on the intensity of the characteristic signal includes: The intensity of the feature signal is compared with the intensity threshold. If the intensity of the characteristic signal is greater than or equal to the intensity threshold, the generated detachment status monitoring result is that the physical contact of the snap-on current transformer is damaged. If the intensity of the characteristic signal is less than the intensity threshold, the generated detachment status monitoring result is that the snap-on current transformer has detached.

[0047] In one embodiment, when a physical contact is detected to be open, a command is sent via the intelligent measurement terminal to the energy meter on the primary side branch line. This causes the energy meter's carrier module to generate an coded characteristic current signal on that branch line. The signal is sampled by a snap-on current transformer, demodulated by the branch monitoring module, and the characteristic signal strength under a preset frequency band is extracted. The intelligent measurement terminal compares the characteristic signal strength with a preset threshold: if the characteristic signal strength is less than the preset threshold, the intelligent measurement terminal outputs a snap-on current transformer detachment status, i.e., the generated detachment status monitoring result is a snap-on current transformer detachment; if the characteristic signal strength is greater than or equal to the preset threshold, the intelligent measurement terminal outputs a snap-on current transformer physical contact damage status, i.e., the generated detachment status monitoring result is a snap-on current transformer physical contact damage. The overall process is as follows: Figure 4 The left half of the image is shown.

[0048] This invention, by receiving the physical contact status detected by a flexible conductive detection switch, can convert the mechanical conduction state of the snap-fit ​​structure into a recognizable electrical signal. By injecting a characteristic current signal according to a preset time period or when the physical contact state is open and receiving the demodulated characteristic signal strength, a dual detection mechanism based on time-driven and event-driven methods can be established, improving the robustness of the monitoring results. By generating monitoring results based on the physical contact status and characteristic signal strength in the time-period trigger mode, physical status can be introduced as a judgment criterion in electrical detection, enriching the dimensions of fault diagnosis. By generating monitoring results based on the characteristic signal strength in the physical contact open trigger mode, the electrical coupling state can be verified under the premise of known physical contact anomalies, improving the accuracy of detachment judgment. Compared with the prior art that relies on manual inspection, this application can improve the accuracy of monitoring the detachment state of snap-fit ​​current transformers.

[0049] Optionally, in this embodiment of the invention, receiving the physical contact status uploaded by the snap-on current transformer includes: The MCU outputs a detection level to the detection circuit; wherein, the detection circuit consists of the upper and lower semicircular rings of the snap-on current transformer and the flexible conductive detection switch; The voltage level is read through the MCU's I / O port, and the physical contact status is generated and uploaded based on the voltage level.

[0050] This invention, through the MCU outputting a detection level to the detection circuit and reading the IO port level value, can convert the mechanical conduction state of the snap-fit ​​structure into a digital level signal, thereby realizing the digital acquisition and uploading of the physical contact state.

[0051] Optionally, in this embodiment of the invention, generating and uploading the physical contact status based on the level value includes: When the read level value is zero, the generated and uploaded physical contact status is on; When the level value read is the same as the level value of the detected level, the physical contact status generated and uploaded is disconnected.

[0052] This invention generates the on or off physical contact state based on the read level value, which maps the mechanical conduction status of the snap-fit ​​structure to a logical state, providing a basis for subsequent judgment.

[0053] Optionally, in this embodiment of the invention, the step of injecting a characteristic current signal into the primary side branch of the snap-fit ​​current transformer according to a preset time period, or when the physical contact is open, and receiving the characteristic signal strength acquired and demodulated from the secondary winding of the snap-fit ​​current transformer, includes: According to a preset time period, or when the physical contact is open, a characteristic current signal is injected into the primary side branch line so that the secondary winding of the snap-on current transformer generates a response signal. The response signal is demodulated to obtain the characteristic signal intensity.

[0054] The embodiments of the present invention can extract the characteristic signal intensity of a specific frequency from a complex current signal and eliminate background noise interference by demodulating the secondary response signal after injecting a characteristic current signal.

[0055] Optionally, in this embodiment of the invention, if the characteristic current signal is injected with the time period as the trigger condition, generating the disengagement status monitoring result of the snap-on current transformer based on the physical contact state and the intensity of the characteristic signal includes: The intensity of the characteristic signal is compared with a preset intensity threshold; If the intensity of the characteristic signal is greater than or equal to the intensity threshold, the snap-on current transformer is determined to be normal and no detachment status monitoring result is generated. If the intensity of the characteristic signal is less than the intensity threshold, then the detachment status monitoring result of the snap-on current transformer is generated based on the physical contact status and the intensity of the characteristic signal.

[0056] By comparing the intensity of a characteristic signal with a preset threshold, this invention can quickly filter out operating conditions with normal signal intensity, thereby improving monitoring efficiency.

[0057] Optionally, in this embodiment of the invention, the step of generating a monitoring result of the detachment status of the snap-on current transformer based on the physical contact state and the characteristic signal intensity if the intensity of the characteristic signal is less than the intensity threshold includes: If the intensity of the characteristic signal is zero and the physical contact is open, the generated detachment status monitoring result is that the snap-on current transformer has detached. If the intensity of the characteristic signal is zero and the physical contact is in a conducting state, the generated detachment status monitoring result is that the secondary side of the snap-on current transformer is open. If the intensity of the characteristic signal is not equal to zero and the physical contact state is on, then the generated detachment status monitoring result is that the snap-on current transformer is not fully on.

[0058] This invention combines the determination of whether the characteristic signal strength is zero and whether the physical contact is conductive to automatically distinguish three different fault states: detachment, secondary side open circuit, and incomplete conduction.

[0059] Optionally, in this embodiment of the invention, if the characteristic current signal is injected with the physical contact state as a trigger condition, generating the disengagement status monitoring result of the snap-on current transformer based on the intensity of the characteristic signal includes: The intensity of the feature signal is compared with the intensity threshold. If the intensity of the characteristic signal is greater than or equal to the intensity threshold, the generated detachment status monitoring result is that the physical contact of the snap-on current transformer is damaged. If the intensity of the characteristic signal is less than the intensity threshold, the generated detachment status monitoring result is that the snap-on current transformer has detached.

[0060] This invention generates monitoring results by comparing the intensity of the characteristic signal with a threshold when the physical contact is disconnected and injection is triggered. This allows for reverse verification of whether the physical contact detection process itself has malfunctioned.

[0061] like Figure 5 As shown, based on the above-mentioned method embodiments, a snap-on current transformer disconnection status monitoring system is provided, including: a current monitoring unit, a status detection unit, a branch monitoring module, and an intelligent measurement terminal; The current monitoring unit is a current sampling device on a snap-on current transformer, used for sampling the current of low-voltage branch lines (i.e., primary side branch lines). The current monitoring unit is a non-contact measuring device, requiring no direct contact with the conductor. It consists of an iron core and a winding. The iron core has an opening to facilitate the insertion of the cable under test into the device, making installation and disassembly relatively simple and not affecting the operation of the power system. Specifically, the current monitoring unit can perform the action of collecting the response signal induced by the secondary winding of the snap-on current transformer in step S102.

[0062] The status detection unit is a detachment detection device on the snap-on current transformer, used to detect whether the snap-on current transformer is correctly installed and whether it is strictly conductive. The status detection unit consists of a flexible conductive detection switch and a detection circuit, capable of detecting the physical state of the snap-on current transformer's conduction. Specifically, the status detection unit can perform the action of detecting the physical contact state of the snap-on current transformer in step S101.

[0063] The branch monitoring module is an intelligent module with current signal acquisition and analysis capabilities, used for daily metering sampling and characteristic signal identification. The branch monitoring module demodulates and analyzes the current signal sampled by the snap-on current transformer and reports it to the intelligent measurement terminal. Specifically, the branch monitoring module can execute the action in step S102 of demodulating the response signal induced by the secondary winding of the snap-on current transformer.

[0064] The intelligent measurement terminal is installed in the low-voltage distribution area of ​​the public transformer. It is an intelligent data acquisition and control terminal device with metering function, used to determine whether the snap-fit ​​current transformer is in a detached state. The intelligent measurement terminal adopts a modular hardware and app-based software design concept, supports the acquisition of various data types, possesses high-performance computing capabilities for edge computing, can store large amounts of data, and has functions such as power metering, data acquisition, load monitoring, and control. Specifically, the intelligent measurement terminal can execute the actions in steps S103 and S104 to generate the detachment status monitoring result of the snap-fit ​​current transformer. The detachment status monitoring logic of the intelligent measurement terminal is shown in Table 1.

[0065] Table 1 - Logic Table for Monitoring the Detachment Status of Intelligent Measurement Terminals The embodiments of the present invention employ a combined approach of physical shedding state detection and feature signal injection detection, which can compensate for the shortcomings of a single detection method and effectively avoid false alarms or missed alarms caused by the failure of a single sensor.

[0066] like Figure 6 As shown, based on the above method embodiments, corresponding apparatus embodiments are provided; An embodiment of the present invention provides a snap-on current transformer detachment status monitoring device, including: a physical contact detection module 601, a feature signal detection module 602, a first result generation module 603, and a second result generation module 604; The physical contact detection module 601 is used to receive the physical contact status uploaded by the snap-on current transformer; wherein, the physical contact status is detected by a flexible conductive detection switch disposed on the conductive contact surface of the snap-on current transformer. The feature signal detection module 602 is used to inject a feature current signal into the primary side branch line of the snap-on current transformer according to a preset time period or when the physical contact is open, and to receive the feature signal intensity collected and demodulated from the secondary winding of the snap-on current transformer; wherein the feature signal intensity is generated by the feature current signal induced in the snap-on current transformer. The first result generation module 603 is used to generate a detection result of the detachment status of the snap-on current transformer based on the physical contact status and the intensity of the characteristic signal if the characteristic current signal is injected with the time period as the trigger condition. The second result generation module 604 is used to generate a detection result of the detachment status of the snap-on current transformer based on the intensity of the characteristic signal if the characteristic current signal is injected with the physical contact state as the trigger condition.

[0067] Optionally, in this embodiment of the invention, the physical contact detection module 601 includes: a level output submodule and a level reading submodule; The level output submodule is used to output a detection level to the detection circuit via the MCU; wherein, the detection circuit consists of the upper and lower semicircular rings of the snap-on current transformer and the flexible conductive detection switch; The level reading submodule is used to read the level value through the MCU's IO port, and generate and upload the physical contact status based on the level value.

[0068] This invention, through the MCU outputting a detection level to the detection circuit and reading the IO port level value, can convert the mechanical conduction state of the snap-fit ​​structure into a digital level signal, thereby realizing the digital acquisition and uploading of the physical contact state.

[0069] Optionally, in this embodiment of the invention, the level reading submodule includes: a first state generation unit and a second state generation unit; The first state generation unit is used to generate and upload a physical contact state of "conduction" when the read level value is zero. The second state generation unit is used to generate and upload a physical contact state of disconnection when the read level value is the level value of the detected level.

[0070] This invention generates the on or off physical contact state based on the read level value, which maps the mechanical conduction status of the snap-fit ​​structure to a logical state, providing a basis for subsequent judgment.

[0071] Optionally, in this embodiment of the invention, the feature signal detection module 602 includes: a signal injection submodule and a signal demodulation submodule; The signal injection submodule is used to inject a characteristic current signal into the primary side branch line according to a preset time period, or when the physical contact is open, so that the secondary winding of the snap-on current transformer can generate a response signal. The signal demodulation submodule is used to demodulate the response signal to obtain the characteristic signal intensity.

[0072] The embodiments of the present invention can extract the characteristic signal intensity of a specific frequency from a complex current signal and eliminate background noise interference by demodulating the secondary response signal after injecting a characteristic current signal.

[0073] Optionally, in this embodiment of the invention, the first result generation module 603 includes: a first intensity comparison submodule, a first comparison result submodule, and a second comparison result submodule; The first intensity comparison submodule is used to compare the intensity of the feature signal with a preset intensity threshold; The first comparison result submodule is used to determine that the snap-on current transformer is normal and not generate a detachment status monitoring result if the intensity of the feature signal is greater than or equal to the intensity threshold. The second comparison result submodule is used to generate a detachment status monitoring result of the snap-on current transformer based on the physical contact status and the characteristic signal intensity if the intensity of the characteristic signal is less than the intensity threshold.

[0074] By comparing the intensity of a characteristic signal with a preset threshold, this invention can quickly filter out operating conditions with normal signal intensity, thereby improving monitoring efficiency.

[0075] Optionally, in this embodiment of the invention, the second comparison result submodule includes: a first result generation unit, a second result generation unit, and a third result generation unit; The first result generation unit is configured to generate a detachment status monitoring result of a snap-on current transformer detachment if the intensity of the feature signal is equal to zero and the physical contact state is open. The second result generation unit is used to generate a disconnection status monitoring result of open circuit on the secondary side of the snap-on current transformer if the intensity of the feature signal is equal to zero and the physical contact state is on. The third result generation unit is used to generate a disconnection status monitoring result as follows: if the intensity of the characteristic signal is not equal to zero and the physical contact state is on, the snap-on current transformer is not fully on.

[0076] This invention combines the determination of whether the characteristic signal strength is zero and whether the physical contact is conductive to automatically distinguish three different fault states: detachment, secondary side open circuit, and incomplete conduction.

[0077] Optionally, in this embodiment of the invention, the second result generation module 604 includes: a second intensity comparison submodule, a first result generation submodule, and a second result generation submodule; The second intensity comparison submodule is used to compare the intensity of the feature signal with the intensity threshold; The first result generation submodule is used to generate a detachment status monitoring result as physical contact damage of the snap-on current transformer if the intensity of the feature signal is greater than or equal to the intensity threshold. The second result generation submodule is used to generate a detachment status monitoring result as a snap-on current transformer detachment if the intensity of the feature signal is less than the intensity threshold.

[0078] This invention generates monitoring results by comparing the intensity of the characteristic signal with a threshold when the physical contact is disconnected and injection is triggered. This allows for reverse verification of whether the physical contact detection process itself has malfunctioned.

[0079] It is understood that the above-described device embodiments correspond to the method embodiments of the present invention, and can implement the snap-on current transformer detachment monitoring method provided by any of the above-described method embodiments of the present invention.

[0080] This invention, through a physical contact detection module 601, receives the physical contact state detected by a flexible conductive detection switch, converting the mechanical conduction state of the snap-fit ​​structure into a recognizable electrical signal. A feature signal detection module 602 injects a feature current signal according to a preset time period or when the physical contact state is open, and receives the demodulated feature signal strength, establishing a dual detection mechanism based on time-driven and event-driven approaches, improving the robustness of the monitoring results. A first result generation module 603 generates monitoring results based on the physical contact state and feature signal strength in a time-period trigger mode, introducing physical state as a judgment criterion in electrical testing and enriching the dimensions of fault diagnosis. A second result generation module 604 generates monitoring results based on the feature signal strength in a physical contact disconnection trigger mode, verifying the electrical coupling state under known physical contact anomalies, improving the accuracy of detachment judgment. Compared to existing technologies that rely on manual inspection, this application improves the accuracy of monitoring the detachment state of snap-fit ​​current transformers.

[0081] It should be noted that the device embodiments described above are merely illustrative, and some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Furthermore, in the accompanying drawings of the device embodiments provided by this invention, the connection relationships between modules indicate that they have communication connections, which can specifically be implemented as one or more communication buses or signal lines. Those skilled in the art can understand and implement this without any creative effort.

[0082] Based on the above-described embodiment of a snap-fit ​​current transformer disconnection status monitoring method, another embodiment of the present invention provides a terminal device, which includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, it implements a snap-fit ​​current transformer disconnection status monitoring method according to any embodiment of the present invention.

[0083] For example, in this embodiment, the computer program can be divided into one or more modules, which are stored in the memory and executed by the processor to complete the present invention. The one or more modules may be a series of computer program instruction segments capable of performing a specific function, which describe the execution process of the computer program in the terminal device.

[0084] The terminal device may be a desktop computer, laptop, handheld computer, or cloud server, etc. The terminal device may include, but is not limited to, a processor and a memory.

[0085] The processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor can be a microprocessor or any conventional processor. The processor is the control center of the terminal device, connecting all parts of the terminal device via various interfaces and lines.

[0086] Based on the above-described method embodiments, another embodiment of the present invention provides a computer-readable storage medium including a stored computer program, wherein, when the computer program is executed, it controls the device where the computer-readable storage medium is located to execute the snap-on current transformer detachment monitoring method described in any of the above-described method embodiments of the present invention.

[0087] The modules / units integrated in the device / terminal equipment, if implemented as software functional units and sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the above embodiments of the present invention can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunication signal, and a software distribution medium, etc.

[0088] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for monitoring the detachment status of a snap-on current transformer, characterized in that, include: Receive the physical contact status uploaded by the snap-on current transformer; wherein, the physical contact status is detected by a flexible conductive detection switch disposed on the conductive contact surface of the snap-on current transformer; According to a preset time period, or when the physical contact is open, a characteristic current signal is injected into the primary side branch line of the snap-on current transformer, and the characteristic signal intensity is received and demodulated from the secondary winding of the snap-on current transformer; wherein, the characteristic signal intensity is generated by the characteristic current signal in the snap-on current transformer. If the characteristic current signal is injected with the time period as the trigger condition, then the dislodgement status monitoring result of the snap-on current transformer is generated based on the physical contact state and the intensity of the characteristic signal. If the characteristic current signal is injected with the physical contact state as the trigger condition, then the detachment status monitoring result of the snap-on current transformer is generated based on the intensity of the characteristic signal.

2. The method for monitoring the detachment status of a snap-on current transformer as described in claim 1, characterized in that, The physical contact status transmitted by the receiving snap-on current transformer includes: The MCU outputs a detection level to the detection circuit; wherein, the detection circuit consists of the upper and lower semicircular rings of the snap-on current transformer and the flexible conductive detection switch; The voltage level is read through the MCU's I / O port, and the physical contact status is generated and uploaded based on the voltage level.

3. The method for monitoring the detachment status of a snap-on current transformer as described in claim 2, characterized in that, The process of generating and uploading the physical contact status based on the level value includes: When the read level value is zero, the generated and uploaded physical contact status is on; When the level value read is the same as the level value of the detected level, the physical contact status generated and uploaded is disconnected.

4. The method for monitoring the detachment status of a snap-on current transformer as described in claim 1, characterized in that, The step of injecting a characteristic current signal into the primary branch line of the snap-on current transformer according to a preset time period, or when the physical contact is open, and receiving the characteristic signal strength acquired and demodulated from the secondary winding of the snap-on current transformer, includes: According to a preset time period, or when the physical contact is open, a characteristic current signal is injected into the primary side branch line so that the secondary winding of the snap-on current transformer generates a response signal. The response signal is demodulated to obtain the characteristic signal intensity.

5. The method for monitoring the detachment status of a snap-on current transformer as described in claim 1, characterized in that, If the characteristic current signal is injected with the time period as the trigger condition, then the disengagement status monitoring result of the snap-on current transformer is generated based on the physical contact state and the intensity of the characteristic signal, including: The intensity of the characteristic signal is compared with a preset intensity threshold; If the intensity of the characteristic signal is greater than or equal to the intensity threshold, the snap-on current transformer is determined to be normal and no detachment status monitoring result is generated. If the intensity of the characteristic signal is less than the intensity threshold, then the detachment status monitoring result of the snap-on current transformer is generated based on the physical contact status and the intensity of the characteristic signal.

6. The method for monitoring the detachment status of a snap-on current transformer as described in claim 5, characterized in that, If the intensity of the characteristic signal is less than the intensity threshold, then a monitoring result of the detachment status of the snap-on current transformer is generated based on the physical contact status and the intensity of the characteristic signal, including: If the intensity of the characteristic signal is zero and the physical contact is open, the generated detachment status monitoring result is that the snap-on current transformer has detached. If the intensity of the characteristic signal is zero and the physical contact is in a conducting state, the generated detachment status monitoring result is that the secondary side of the snap-on current transformer is open. If the intensity of the characteristic signal is not equal to zero and the physical contact state is on, then the generated detachment status monitoring result is that the snap-on current transformer is not fully on.

7. The method for monitoring the detachment status of a snap-on current transformer as described in claim 5, characterized in that, If the characteristic current signal is injected based on the physical contact state as a trigger condition, then the disengagement status monitoring result of the snap-on current transformer is generated according to the intensity of the characteristic signal, including: The intensity of the feature signal is compared with the intensity threshold. If the intensity of the characteristic signal is greater than or equal to the intensity threshold, the generated detachment status monitoring result is that the physical contact of the snap-on current transformer is damaged. If the intensity of the characteristic signal is less than the intensity threshold, the generated detachment status monitoring result is that the snap-on current transformer has detached.

8. A snap-on current transformer detachment monitoring device, characterized in that, include: Physical contact detection module, feature signal detection module, first result generation module, and second result generation module; The physical contact detection module is used to receive the physical contact status uploaded by the snap-on current transformer; wherein, the physical contact status is detected by a flexible conductive detection switch disposed on the conductive contact surface of the snap-on current transformer. The feature signal detection module is used to inject a feature current signal into the primary branch line of the snap-on current transformer according to a preset time period or when the physical contact is open, and to receive the feature signal intensity collected and demodulated from the secondary winding of the snap-on current transformer; wherein the feature signal intensity is generated by the feature current signal induced in the snap-on current transformer. The first result generation module is used to generate a monitoring result of the detachment status of the snap-on current transformer based on the physical contact status and the intensity of the characteristic signal if the characteristic current signal is injected with the time period as the trigger condition. The second result generation module is used to generate a detection result of the detachment status of the snap-on current transformer based on the intensity of the characteristic signal if the characteristic current signal is injected with the physical contact state as the trigger condition.

9. A terminal device, characterized in that, The device includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, it implements a method for monitoring the disconnection status of a snap-on current transformer as described in any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, include: A stored computer program, wherein, when the computer program is executed, it controls the device containing the computer-readable storage medium to perform a snap-on current transformer detachment monitoring method as described in any one of claims 1-7.

Images