Opening and closing coil management method and system based on radio frequency identification and non-contact measurement

Abstract

The invention belongs to the field of remote operation and maintenance of a power system, and the method comprises the steps: checking the state of a radio frequency signal, monitoring the heating state of an opening and closing coil in real time, and adaptively adjusting the environment temperature to guarantee normal monitoring; the non-contact potential measuring device is used for measuring the voltage of the measuring point potential and the current measured by the direct current transformers CT1 and CT2 is used for monitoring the resistance of the opening and closing coil in real time under the condition that the circuit breaker is not opened and closed; the coil potential state is calculated through an algorithm, the opening and closing coil leakage current is monitored, the opening and closing coil resistance is further calculated, and a real-time monitoring opening and closing resistance system is established. Whether the opening and closing coil is burnt or not can be effectively judged, the resistance of the opening and closing coil is monitored in real time under the condition that the circuit breaker is not opened and closed, the phenomenon that the resistance of the opening and closing coil is periodically tested is avoided, the hidden danger that the resistance of the opening and closing coil cannot be directly monitored is eliminated, and stable operation of a power system is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of remote operation and maintenance of power systems, and particularly relates to a method and system for managing switching coil based on radio frequency identification and non-contact measurement. BACKGROUND

[0002] A circuit breaker is an electrical device used to control and protect electrical circuits from damage caused by electrical faults such as overloads, short circuits, and ground faults. The switching of the circuit breaker is mainly achieved through the excitation of the switching coil and the coordinated action of the circuit breaker mechanism, thereby realizing the switching of the circuit breaker.

[0003] In the operation of power systems, switching coil burnout accidents often occur. When an electrical accident occurs, if the circuit breaker refuses to operate due to the breakage of the high-voltage vacuum circuit breaker switching loop, the accident will be expanded, causing over-level switching and resulting in large-scale power outages, and even causing the burning of electrical equipment, fires, and other serious consequences.

[0004] The switching coil is designed for short-time power supply. The burning of the switching coil is mainly due to the failure of the switching coil loop current to be normally cut off, resulting in long-time power supply of the switching coil, generating a large amount of heat, and causing the coil to burn out. When the circuit breaker coil burns out, the resistance becomes significantly smaller, but the circuit breaker does not operate, and the monitoring circuit of the control loop cannot identify that the coil has been burned out, resulting in a blind area for the management and monitoring of the coil.

[0005] At present, relevant professionals have carried out a lot of research on the monitoring of switching coils. Most of the current methods are aimed at studying the switching current, and then judging the duration of the current and the amount of heat generated, so as to determine whether the circuit breaker coil is burned out. However, when the circuit breaker is not switched, it cannot be determined whether the circuit breaker switching coil is normal. In view of the above problems, the present application is proposed. The present application monitors and manages the switching coil of the circuit breaker in real time, ensuring the stable operation and safety of the power system. Through radio frequency identification (RFID) and non-contact measurement technology, the state of the coil can be effectively monitored, including but not limited to the temperature, resistance, leakage current, and other parameters of the coil. These parameters can reflect the operating state of the coil, such as whether there is overheating, damage, or poor contact. Ensuring the normal operation of the switching coil, improving the stability and safety of the power system, reducing the failure rate and economic loss, and realizing the intelligent management and maintenance of the smart grid. SUMMARY

[0006] In view of the above existing problems, the present application is proposed. The present application monitors and manages the switching coil of the circuit breaker in real time, ensuring the stable operation and safety of the power system. Through radio frequency identification (RFID) and non-contact measurement technology, the state of the coil can be effectively monitored, including but not limited to the temperature, resistance, leakage current, and other parameters of the coil. These parameters can reflect the operating state of the coil, such as whether there is overheating, damage, or poor contact. Ensuring the normal operation of the switching coil, improving the stability and safety of the power system, reducing the failure rate and economic loss, and realizing the intelligent management and maintenance of the smart grid.

[0007] To solve the above technical problems, a method for managing switching coil based on radio frequency identification and non-contact measurement is proposed, which includes:

[0008] The state of the radio frequency signal is checked to monitor the state of the opening and closing coil in real time, the heating state of the coil is monitored, and the ambient temperature is self-adaptively adjusted to ensure normal monitoring; the voltage of the potential at the measuring point is measured by the non-contact potential measuring device, and the current measured by the current transformers CT1 and CT2 is monitored in real time to monitor the resistance of the opening and closing coil when the circuit breaker is not opened or closed; the state of the coil potential is calculated by an algorithm, and the leakage current of the opening and closing coil is monitored, and then the resistance of the opening and closing coil is calculated to establish a real-time monitoring system of the opening and closing resistance.

[0009] As a preferred scheme of the opening and closing coil management method based on radio frequency identification and non-contact measurement, the radio frequency signal includes temperature sensing by using an active temperature sensing RFID electronic tag attached to the opening and closing coil; when the circuit breaker opening and closing coil operates to cause tripping or closing, a magnetic field is generated to interfere with the signal of the RFID electronic tag; when the circuit breaker is opened, the opening and closing circuit is disconnected and the magnetic field disappears, and at this time the signal is restored; however, when the circuit breaker is powered for a long time due to external influence and mechanism defects, the temperature of the circuit breaker coil rises.

[0010]

[0011] When the temperature of the circuit breaker coil rises, the power method is used for calculation and the square root method is used for correction, wherein R2 is the winding resistance at the end of tripping, which is measured, R1 is the winding resistance when the circuit breaker is not tripped, which is measured, t1 is the winding temperature when the circuit breaker is not tripped, which is measured by the active temperature sensing RFID electronic tag, t2 is the winding temperature at the end of tripping, which is measured by the active temperature sensing RFID electronic tag, and F is the metal coefficient, F=235 when the winding in the coil is copper wire, and F=225 when the winding in the coil is aluminum wire.

[0012] As a preferred scheme of the opening and closing coil management method based on radio frequency identification and non-contact measurement, the calculation by using the power method and the correction by using the square root method include calculation by using the power method: when the circuit breaker trips, the voltage across the tripping coil at this time is U1-U2, and when the circuit breaker has a sticking fault, the tripping coil becomes a pure resistance, and at this time the coil resistance is the parameter R of the coil factory, and at this time the heat power is The heat generated is W=P(t d -t x ), and at this time the temperature of the active temperature sensing RFID electronic tag rises Then the square root method is used for correction, and the maximum temperature of the actual coil after correction is

[0013]

[0014] t dt is the time when the signal is disconnected x W is the heat generated by the coil, m is the mass of the active temperature sensing RFID electronic tag, and C is the average specific heat capacity of the active temperature sensing RFID electronic tag.

[0015] As a preferred scheme of the switching coil management method based on radio frequency identification and non-contact measurement, the coil heating state includes that when the coil is at the highest value of temperature rise for a long time, i.e. t2, the coil and the active temperature sensing RFID electronic tag will be damaged, resulting in long-time disconnection of the signal. When the signal is disconnected, the position of the circuit breaker is determined. When there is a position change of the circuit breaker and the signal is quickly restored, it is determined that the signal is normal at this time. When there is a position change of the circuit breaker and the signal is disconnected for a long time, it is determined that the switching coil is overheated due to long-time energization, and the coil is burned out.

[0016] When the signal is disconnected and there is no change in the position of the circuit breaker, it is determined whether the circuit breaker sends a "control loop disconnection" signal through the web system. When the control loop disconnection signal is sent, it is determined that the control loop is disconnected due to damage of the circuit breaker coil caused by external factors, and at this time the coil is in a disconnected and damaged state.

[0017] When the control loop disconnection does not occur, it is determined that the circuit breaker coil is damaged by external factors and the coil is in a short-circuit damaged state.

[0018] As a preferred scheme of the switching coil management method based on radio frequency identification and non-contact measurement, the coil potential state calculated by the algorithm includes that the potentials of measuring points 1-4 are U1, U2, U3, U4, and the currents I1, I2 measured by the direct current current transformers CT1 and CT2. When the circuit breaker is in the closed position, if U1=U2=-U km , it is determined that the tripping coil potential is normal, otherwise the tripping coil potential is abnormal, and power outage processing is performed.

[0019] When U3=U4=+U km , it is determined that the closing coil potential is normal, otherwise the tripping coil potential is abnormal, and power outage processing is performed. km -U km is the negative potential of the direct current system, and +U km is the positive potential of the direct current system.

[0020] As a preferred scheme of the switching coil management method based on radio frequency identification and non-contact measurement, the real-time monitoring switching resistance system includes calculating the coil voltage and current. When the circuit breaker is in the closed position, the tripping loop is conducted through the monitoring loop at this time, and the tripping coil resistance is When If yes, it is judged that the opening coil is normal, otherwise, the opening resistance is abnormal.

[0021] When the circuit breaker is in the opening position, the closing loop is conducted through the monitoring loop at this time, and the trip coil resistance is When If yes, it is judged that the opening coil is normal, otherwise, the opening resistance is abnormal, wherein, I1 is the current value collected by the DC current transformer CT1, R N is the resistance of the opening coil, I2 is the current value collected by the DC current transformer CT2, R M is the resistance of the closing coil.

[0022] As a preferred scheme of the opening and closing coil management method based on radio frequency identification and non-contact measurement, the adaptive adjustment of the ambient temperature comprises collecting operation history data of the opening and closing coil, including temperature change data and fault data, and analyzing the data to obtain normal operation state and overheating state of the coil.

[0023] When the ambient temperature exceeds 30 DEG C, the temperature rising speed of the coil is accelerated, resulting in the overheating state appearing in advance, at this time, the monitoring ambient temperature needs to be reduced, when the ambient temperature is lower than 15 DEG C, the temperature rising speed of the coil is slowed down, resulting in that the overheating state does not appear and the time of appearing the overheating state is delayed, at this time, the monitoring ambient temperature needs to be increased, the reduced and increased ambient temperature is calculated by the following formula:

[0024]

[0025] Wherein, T ↑ / ↓ is the ambient temperature needing to be reduced or increased, T i is the current ambient temperature, T0 is the initial ambient temperature, and DT is the temperature of the coil, V is the rising speed of the coil temperature.

[0026] Another object of the present application is to provide an opening and closing coil management system based on radio frequency identification and non-contact measurement, which improves the safety performance and operation efficiency of the opening and closing coil of the circuit breaker in the power system. By real-time monitoring of the temperature, potential and leakage current and other key parameters of the coil, the system can effectively prevent the coil from overheating, damage and other problems, thereby ensuring the stable operation of the power system.

[0027] As a preferred scheme of the opening and closing coil management system based on radio frequency identification and non-contact measurement, it is characterized by comprising a radio frequency signal state checking module, a non-contact measurement module, a coil potential state calculation module and an opening and closing coil leakage current monitoring module.

[0028] The radio frequency signal state checking module monitors the signal emitted by the active temperature sensing RFID electronic tag to determine the temperature state of the opening and closing coil, preventing coil damage due to overheating and ensuring normal signal.

[0029] The non-contact measurement module measures the potential of the measurement points 1-4 and the current measured by the direct current current transformers CT1 and CT2 in a non-contact manner, to obtain the accurate electrical state of the coil and provide data support for subsequent analysis.

[0030] The coil potential state calculation module calculates the potential state of the trip and closing coils according to the data provided by the non-contact measurement module, determines whether the coil potential is normal, and timely discovers and handles abnormal potential conditions.

[0031] The opening and closing coil leakage current monitoring module monitors the leakage current of the opening and closing coil and calculates the resistance of the coil, to real-time monitor the electrical performance of the coil and prevent coil damage due to excessive leakage current and abnormal resistance.

[0032] A computer device includes a memory and a processor, and the memory stores a computer program, characterized in that when the processor executes the computer program, the steps of the method for managing the opening and closing coil based on radio frequency identification and non-contact measurement are executed.

[0033] A computer readable storage medium stores a computer program, characterized in that when the computer program is executed by a processor, the steps of the method for managing the opening and closing coil based on radio frequency identification and non-contact measurement are executed.

[0034] The present application has the following advantages: the present application realizes real-time monitoring of the state of the opening and closing coil through the active temperature sensing RFID electronic tag, can effectively determine whether the opening and closing coil is burned after the circuit breaker is opened and closed, eliminates the blind area of the opening and closing coil after action, realizes real-time monitoring of the resistance of the opening and closing coil under the condition that the circuit breaker is not opened and closed through the non-contact direct current potential sensor and the direct current current transformer, avoids periodic testing of the resistance of the opening and closing coil, intelligently judges the resistance of the opening and closing coil, timely alarms when the resistance of the opening and closing coil is abnormal, eliminates the hidden danger that the resistance of the opening and closing coil cannot be directly monitored, and guarantees stable operation of the power system. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0036] Figure 1 The overall flow chart of the closing and opening coil management method based on radio frequency identification and non-contact measurement is provided for one embodiment of the present application.

[0037] Figure 2 The closing and opening coil measurement point chart of the closing and opening coil management method based on radio frequency identification and non-contact measurement is provided for one embodiment of the present application.

[0038] Figure 3 The system function architecture chart of the closing and opening coil management system based on radio frequency identification and non-contact measurement is provided for one embodiment of the present application. DETAILED DESCRIPTION

[0039] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with the drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work should belong to the protection scope of the present application.

[0040] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced without the specific details, which are not described in the present application, and it can be apparent to those skilled in the art that the present application can be implemented in other different ways, therefore the present application is not limited to the specific embodiments disclosed below.

[0041] Secondly, the "one embodiment" or "embodiment" referred to herein can include specific features, structures or characteristics contained in at least one implementation of the present application. "In one embodiment" appearing in different places in the specification does not mean the same embodiment, nor does it mean that the embodiment is not combined with other embodiments or is not selected from other embodiments.

[0042] The present application is described in detail in conjunction with the schematic diagram, and in the detailed description of the embodiments of the present application, the cross-sectional view of the device structure is partially enlarged without the general proportion for the convenience of description, and the schematic diagram is only an example, which should not limit the protection scope of the present application herein. In addition, the three-dimensional spatial dimensions of length, width and depth should be included in the actual manufacture.

[0043] Furthermore, in the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used solely for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In addition, the terms "first," "second," or "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0044] Unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" in this invention should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; similarly, they can refer to mechanical connections, electrical connections, or direct connections, or indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0045] Example 1

[0046] Reference Figures 1-2 This is the first embodiment of the present invention, which provides a method for managing opening and closing coils based on radio frequency identification and non-contact measurement, including:

[0047] S1: Check the status of the radio frequency signal to monitor the status of the opening and closing coils in real time, monitor the coil heating status, and adaptively adjust the ambient temperature to ensure normal monitoring.

[0048] Furthermore, an active temperature-sensing RFID electronic tag is used for temperature sensing, attached to the opening and closing coils: when the circuit breaker's opening and closing coils operate, causing tripping or closing, a magnetic field is generated, interfering with the signal transmission of the RFID electronic tag. When the circuit breaker opens, the opening and closing circuit is disconnected, the magnetic field disappears, and the signal recovers. However, if the circuit breaker is energized for a long time due to external influences or mechanical defects, the temperature of the circuit breaker coil will rise.

[0049]

[0050] When the temperature of the circuit breaker coil rises, the power method is used for calculation and corrected using the square root method. The power method calculation is as follows: When the circuit breaker trips, the voltage across the trip coil is U1-U2. When the circuit breaker experiences a jamming fault, the trip coil becomes a pure resistor, and the coil resistance at this time is the parameter R of the coil manufacturer. Therefore, the heating power at this time is... The heat generated is W = P(t) d -t x If the temperature of the active temperature-sensing RFID tag rises at this time, then the temperature of the tag will increase. Then, using the square root method for correction, the maximum temperature of the actual coil after correction is:

[0051]

[0052] Wherein, t d is the moment of disconnection of the signal, t x is the moment of disappearance of the voltage across the coil, W is the heat generated by the coil, m is the mass of the active temperature sensing RFID electronic tag, and C is the average specific heat capacity of the active temperature sensing RFID electronic tag.

[0053] Wherein, R2 is the winding resistance at the end of the trip, which is measured, R1 is the winding resistance when the trip is not tripped, which is measured, t1 is the winding temperature when the trip is not tripped, which is measured by the active temperature sensing RFID electronic tag, t2 is the winding temperature at the end of the trip, which is measured by the active temperature sensing RFID electronic tag, F is the metal coefficient, F = 235 when the winding in the coil is copper wire, and F = 225 when the winding in the coil is aluminum wire.

[0054] It should be noted that when the coil is at the highest value of temperature rise, i.e. t2, for a long time, the coil and the active temperature sensing RFID electronic tag will be damaged, resulting in a long time disconnection of the signal. When the signal is disconnected, the position of the circuit breaker is determined. When there is a position change of the circuit breaker and the signal is quickly restored, it is determined that the signal is normal at this time. When there is a position change of the circuit breaker and the signal is disconnected for a long time, it is determined that the energization time of the closing and opening coil is too long, resulting in a large amount of heat, and the coil is burned out.

[0055] When the signal is disconnected and there is no change in the position of the circuit breaker, it is determined whether the circuit breaker sends a "control loop wire break" signal through the web system. When the control loop wire break signal is sent, it is determined that the control loop is broken due to damage to the circuit breaker coil caused by external factors, and at this time the coil is in a broken and damaged state.

[0056] When the control loop is not broken, it is determined that the circuit breaker coil is damaged by external factors and the coil is in a short-circuit damaged state.

[0057] It should also be noted that the collection of the operation history data of the closing and opening coil includes temperature change data and fault data, and the analysis of the data obtains the normal operation state and the overheating state of the coil.

[0058] When the ambient temperature exceeds 30℃, the temperature rise speed of the coil increases, resulting in an early overheating state. At this time, the monitoring ambient temperature needs to be lowered. When the ambient temperature is lower than 15℃, the temperature rise speed of the coil slows down, resulting in no overheating state and a delayed overheating state. At this time, the monitoring ambient temperature needs to be raised. The lowered and raised ambient temperature is calculated by the following formula:

[0059]

[0060] wherein T ↑ / ↓ is the temperature to be reduced or increased by the environment, T i is the current temperature of the environment, T0is the initial temperature of the environment, and ΔT is the temperature of the coil, and V is the rising speed of the coil temperature.

[0061] S2: measuring the voltage of the potential of the measuring point by the non-contact measuring potential device and the current measured by the DC current transformers CT1 and CT2 to monitor the real-time resistance of the closing and opening coils when the circuit breaker is not in the closing or opening position.

[0062] S3: calculating the coil potential state by the algorithm and monitoring the leakage current of the closing and opening coils to further calculate the resistance of the opening and closing coils and establish the real-time monitoring system of the closing and opening resistance.

[0063] Further, the potential of the measuring points 1-4 is measured by the non-contact measuring potential device as U1, U2, U3 and U4, and the current I1 and I2 measured by the DC current transformers CT1 and CT2, when the circuit breaker is in the closing position, then when U1=U2=-U km , it is judged that the potential of the opening coil is normal, otherwise, the potential of the opening coil is abnormal and the power supply is stopped.

[0064] When U3=U4=+U km , it is judged that the potential of the closing coil is normal, otherwise, the potential of the opening coil is abnormal, wherein -U km is the negative potential of the DC system, and +U km is the positive potential of the DC system.

[0065] It should be noted that the coil voltage and current are calculated, when the circuit breaker is in the closing position, at this time, the opening circuit is conducted through the monitoring circuit, then the resistance of the opening coil is When , it is judged that the opening coil is normal, otherwise, the resistance of the opening coil is abnormal.

[0066] When the circuit breaker is in the opening position, at this time, the closing circuit is conducted through the monitoring circuit, then the resistance of the opening coil is When , it is judged that the opening coil is normal, otherwise, the resistance of the opening coil is abnormal, wherein I1 is the current value collected by the DC current transformer CT1, R N is the resistance of the opening coil, and I2 is the current value collected by the DC current transformer CT2, R M is the resistance of the closing coil.

[0067] Example 2

[0068] Referring to Figure 1For an embodiment of the present application, a closing and opening coil management method based on radio frequency identification and non-contact measurement is provided, and scientific demonstration is carried out through experiments to verify the beneficial effects of the present application.

[0069] S1: Check the state of the radio frequency signal a) Attach an active temperature-sensitive RFID electronic tag to the closing and opening coil of the circuit breaker. b) Record the state of the radio frequency signal through the data logger.

[0070] S2: Measure the potentials of measuring points 1-4 U1, U2, U3, U4 and the currents I1, I2 measured by DC current transformers CT1 and CT2 through non-contact potential measurement devices. a) Use non-contact potential measurement devices to measure the potentials of measuring points 1-4 respectively, and record the data. b) Use DC current transformers CT1 and CT2 to measure currents I1, I2, and record the data.

[0071] S3: Calculate the coil potential state through algorithm a) According to the measured values of U1, U2, U3, U4 and I1, I2, calculate the coil potential state through algorithm, and record the data. b) According to the algorithm, judge whether the trip coil potential and closing coil potential are normal, and record the results.

[0072] S4: Monitor the leakage current of the closing and opening coil, and then calculate the opening and closing coil resistance to establish a real-time monitoring system of the closing and opening resistance. a) When the circuit breaker is in the closing position, measure the resistance of the opening coil by monitoring the loop, and record the data. b) When the circuit breaker is in the opening position, measure the resistance of the closing coil by monitoring the loop, and record the data. c) According to the measured opening coil resistance and closing coil resistance, evaluate the coil state, and record the data.

[0073] Experimental data processing and analysis: According to the data recorded during the experiment:

[0074] Table 1

[0075]

[0076]

[0077] According to the values of R1 and R2, we can calculate the actual resistance value of the coil, and judge whether the coil is damaged.

[0078] According to the value of Tmax, we can judge whether the coil is overheated, so as to prevent the coil from burning out.

[0079] According to the situation of signal disconnection and change of circuit breaker position, we can judge whether the closing and opening coil is normal, and then take corresponding measures.

[0080] It should be noted that the above examples are only used to illustrate the technical solutions of the present application but not limit the present application. Although the present application is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or equivalently replaced without departing from the spirit and scope of the present application, and all these modifications and equivalents should be included in the scope of the claims of the present application.

[0081] Embodiment 3

[0082] The third embodiment of the present application is different from the first two embodiments in that:

[0083] If the functions are realized in the form of software function units and sold or used as independent products, they can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application or the part of the technical solutions that essentially contribute to the prior art or the part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in the various embodiments of the present application. The aforementioned storage medium includes a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk, and various media that can store program codes.

[0084] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered a list of executable instructions for implementing logic functions, and can be specifically embodied in any computer-readable medium for use by an instruction execution system, apparatus, or device, such as a computer-based system, a system including a processor, or other system that can fetch instructions from the instruction execution system, apparatus, or device and execute the instructions, or in conjunction with these instructions. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport programs for use by an instruction execution system, apparatus, or device, or in conjunction with these instruction execution systems, apparatuses, or devices.

[0085] More specific examples (a non-exhaustive list) of the computer-readable medium include the following: an electrical connection (electronic) having one or more wires, a portable computer diskette (magnetic), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer readable medium can be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, for example via an optical scanner, then compiled, interpreted or otherwise processed, as necessary, to generate electronic data, which can then be stored in the computer memory.

[0086] It should be understood that aspects of the application can be implemented in hardware, software, firmware or combinations thereof. In the embodiments described above, various steps or methods can be implemented, for example, by software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, and in another embodiment, any of the following technologies, known in the art, or their combinations can be used: discrete logic circuitry having logic gates for implementing logic functions on data signals, application specific integrated circuits having appropriate combinational logic gates, programmable gate arrays (PGA), field programmable gate arrays (FPGA), etc.

[0087] Embodiment 4

[0088] Referring to Figure 3 For the fourth embodiment of the present application, the embodiment provides a closing and opening coil management system based on radio frequency identification and non-contact measurement, including a radio frequency signal state checking module, a non-contact measurement module, a coil potential state calculation module and a closing and opening coil leakage current monitoring module.

[0089] The radio frequency signal state checking module monitors the signal emitted by the active temperature sensing RFID electronic tag to determine the temperature state of the closing and opening coil, preventing coil damage due to overheating and ensuring normal signal.

[0090] The non-contact measurement module measures the potential of the measurement points 1-4 and the current measured by the DC current transformers CT1 and CT2 in a non-contact manner, to obtain the accurate electrical state of the coil and provide data support for subsequent analysis.

[0091] The coil potential state calculation module calculates the potential state of the trip and closing coils according to the data provided by the non-contact measurement module, to determine whether the coil potential is normal and to discover and handle abnormal potential conditions in a timely manner.

[0092] The opening and closing coil leakage current monitoring module monitors the leakage current of the opening and closing coil, and calculates the resistance of the coil, so as to monitor the electrical performance of the coil in real time, and prevent the coil damage caused by excessive leakage current and abnormal resistance.

[0093] It should be noted that the above examples are only used to illustrate the technical solutions of the present application but not limit the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or equivalently replaced without departing from the spirit and scope of the present application, and all of them should be covered in the scope of the claims of the present application.

Claims

1. A method for managing opening and closing coils based on radio frequency identification and non-contact measurement, characterized in that: include, The radio frequency signal status is checked to monitor the status of the opening and closing coils in real time, and the coil heating status is monitored and the ambient temperature is adaptively adjusted to ensure normal monitoring. Real-time monitoring of the resistance of the opening and closing coils when the circuit breaker is not open or closed, by measuring the voltage of the potential at the measuring point using a non-contact potential measuring device and the current measured by DC current transformers CT1 and CT2. The algorithm calculates the coil potential state and monitors the leakage current of the opening and closing coils, thereby calculating the resistance of the opening and closing coils and establishing a real-time monitoring system for the opening and closing resistance.

2. The method for managing opening and closing coils based on radio frequency identification and non-contact measurement as described in claim 1, characterized in that: The radio frequency signal includes temperature sensing using an active temperature-sensing RFID electronic tag attached to the circuit breaker's opening and closing coils. When the circuit breaker's opening and closing coils operate, causing tripping or closing, a magnetic field is generated, interfering with the signal transmission of the RFID electronic tag. When the circuit breaker opens, the opening and closing circuit is disconnected, the magnetic field disappears, and the signal recovers. However, if the circuit breaker is energized for an extended period due to external influences or mechanical defects, the temperature of the circuit breaker coil will rise. When the temperature of the circuit breaker coil rises, the power method is used for calculation and the square root method is used for correction. Among them, R2 is the winding resistance at the end of the trip, which is obtained by measurement; R1 is the winding resistance when the circuit breaker is not tripped, which is obtained by measurement; t1 is the winding temperature when the circuit breaker is not tripped, which is obtained by measurement through an active temperature sensing RFID electronic tag; t2 is the winding temperature at the end of the trip, which is obtained by measurement through an active temperature sensing RFID electronic tag; F is the metal coefficient, which is 235 when the winding inside the coil is copper wire and 225 when the winding inside the coil is aluminum wire.

3. The method for managing opening and closing coils based on radio frequency identification and non-contact measurement as described in claim 2, characterized in that: The calculation using the power method and correction using the square root method includes the following calculation: When the circuit breaker trips, the voltage across the trip coil is U1-U2. When the circuit breaker experiences a jamming fault, the trip coil becomes a pure resistor, and the coil resistance at this time is the parameter R of the coil manufacturer. Therefore, the heating power at this time is... The heat generated is W = P(t) d -t x If the temperature of the active temperature-sensing RFID tag rises at this time, then the temperature of the tag will increase. Then, using the square root method for correction, the maximum temperature of the actual coil after correction is: Among them, t d t is the time from when the signal is disconnected. x The moment when the voltage across the coil disappears is denoted as W, where W is the heat generated by the coil, m is the mass of the active temperature sensing RFID tag, and C is the average specific heat capacity of the active temperature sensing RFID tag.

4. The method for managing opening and closing coils based on radio frequency identification and non-contact measurement as described in claim 3, characterized in that: The coil heating state includes the following: when the coil is at its highest temperature (t2) for an extended period, it will damage the coil and the active temperature sensing RFID tag, causing the signal to be disconnected for a long time. When the signal is disconnected, the circuit breaker position is determined. When the circuit breaker position changes and the signal is quickly restored, the signal is considered normal. When the circuit breaker position changes and the signal is disconnected for a long time, it is determined that the opening and closing coil has been energized for too long, resulting in excessive heat generation and coil burnout. When the signal is disconnected and the circuit breaker position does not change, the web system determines whether the circuit breaker has issued a "control circuit disconnection" signal. When the control circuit disconnection signal is issued, it is determined that the control circuit is disconnected due to damage to the circuit breaker coil caused by external factors, and the coil is in a disconnected and damaged state at this time. If no control circuit disconnection occurs, it is determined that external factors have affected the circuit breaker coil and that the coil is in a short-circuit damaged state.

5. The method for managing opening and closing coils based on radio frequency identification and non-contact measurement as described in claim 4, characterized in that: The algorithmic calculation of the coil potential state includes measuring the potentials at measuring points 1-4 (U1, U2, U3, U4) using a non-contact potential measurement device, and measuring the currents I1 and I2 measured by DC current transformers CT1 and CT2. When the circuit breaker is in the closed position, then when U1 = U2 = -U... km If the trip coil potential is normal, then the trip coil potential is considered normal; otherwise, if the trip coil potential is abnormal, a power outage is initiated. When U3=U4=+U km If the closing coil potential is normal, then the tripping coil potential is abnormal. Wherein, -U km This is the negative terminal potential of the DC system, +U km This is the positive potential of the DC system.

6. The method for managing opening and closing coils based on radio frequency identification and non-contact measurement as described in claim 5, characterized in that: The establishment of a real-time monitoring system for the opening and closing resistance includes calculating the coil voltage and current. When the circuit breaker is in the closed position, the trip circuit is connected through the monitoring circuit, and the trip coil resistance is... when If the circuit breaker coil is normal, then the circuit breaker resistor is abnormal; otherwise, the circuit breaker resistor is abnormal. When the circuit breaker is in the open position, the closing circuit is connected through the monitoring circuit, and the trip coil resistance is... when If the circuit breaker coil is functioning normally, then the tripping coil is considered normal; otherwise, the tripping resistor is abnormal. Here, I1 is the current value collected by the DC current transformer CT1, and R... N I0 is the resistance of the trip coil, I2 is the current value collected by the DC current transformer CT2, and R0 is the resistance of the trip coil. M This is the resistance of the closing coil.

7. The method for managing opening and closing coils based on radio frequency identification and non-contact measurement as described in claim 6, characterized in that: The adaptive adjustment of ambient temperature includes collecting historical operating data of the opening and closing coils, including temperature change data and fault data, and analyzing the data to obtain the normal operating status and overheating status of the coils. When the ambient temperature exceeds 30℃, the coil's temperature rises rapidly, leading to premature overheating. In this case, the monitored ambient temperature needs to be lowered. When the ambient temperature is below 15℃, the coil's temperature rises slowly, preventing overheating or delaying its occurrence. In this case, the monitored ambient temperature needs to be raised. The lowering and raising of the ambient temperature are calculated using the following formula: Among them, T ↑ / ↓ T i T0 is the current ambient temperature, ΔT is the initial ambient temperature, V is the coil temperature, and V is the rate of temperature increase of the coil.

8. A system employing the opening and closing coil management method based on radio frequency identification and non-contact measurement as described in any one of claims 1 to 7, characterized in that: It includes a radio frequency signal status inspection module, a non-contact measurement module, a coil potential status calculation module, and a circuit breaker coil leakage current monitoring module; The radio frequency signal status inspection module monitors the signal emitted by the active temperature sensing RFID electronic tag to determine the temperature status of the opening and closing coil, preventing coil damage due to overheating and ensuring normal signal. The non-contact measurement module measures the potential of measuring points 1-4 and the current measured by DC current transformers CT1 and CT2 in a non-contact manner, and obtains the precise electrical state of the coil to provide data support for subsequent analysis. The coil potential state calculation module calculates the potential state of the trip and closing coils based on the data provided by the non-contact measurement module, determines whether the coil potential is normal, and promptly detects and handles abnormal potential situations. The leakage current monitoring module for the opening and closing coil monitors the leakage current of the opening and closing coil, calculates the coil's resistance, monitors the coil's electrical performance in real time, and prevents coil damage caused by excessive leakage current or abnormal resistance.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 7.

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