Low-voltage primary and secondary fusion current transformer and self-diagnosis method thereof

Abstract

The invention relates to a low-voltage primary and secondary fusion current transformer and a self-diagnosis method thereof, and relates to the field of current transformers. According to the technical scheme, the low-voltage primary and secondary fusion current transformer can guarantee safe, stable and efficient operation of a power system, the operation state of the transformer can be monitored in real time, and a reference current can be determined by referring to data comparison of a plurality of metering CTs; and the accuracy of the metering data can be judged by comparing the external output current with the reference current, so that whether the mutual inductor and the metering electric energy meter break down or not is judged, and the current mutual inductor and the metering electric energy meter can be maintained and replaced in time.

Description

Technical Field

[0001] The present invention relates to the technical field of current transformers, and in particular to a low-voltage primary-secondary fusion current transformer and a self-diagnosis method thereof. Background Art

[0002] In the power system, the performance reliability of the instrument transformer is crucial as it is a key device to ensure stable power transmission and accurate metering. Traditional instrument transformers have been widely used in various power scenarios for a long time in the past. However, with the development of the power system and the continuous improvement of the requirements for operational stability and safety, their inherent defects have become increasingly prominent. In actual operation, it is difficult for traditional instrument transformers to effectively monitor their own operating status, which makes it difficult to detect in time once the current transformer in operation has an abnormal transformation ratio. The abnormal transformation ratio means that the instrument transformer cannot accurately convert the large current on the primary side into the small current on the secondary side according to the established ratio, which in turn causes deviations in the subsequent energy metering based on the current data, seriously affecting the fairness and accuracy of power settlement. At the same time, when the error exceeds the tolerance, the traditional instrument transformer cannot detect and feedback by itself, causing the operating parameters of the entire power system to deviate from the normal range, burying hidden dangers for the stable operation of the power system.

[0003] What is more serious is that traditional transformers lack effective monitoring and early warning mechanisms for their own open circuit problems. Once the current transformer is open-circuited, a high voltage will be generated on the secondary side, which may not only damage the measurement, protection and other equipment connected to it, but also pose a great threat to the personal safety of on-site operation and maintenance personnel. Since it is impossible to judge the high voltage problem caused by the open circuit of the current transformer in advance, the operation and maintenance personnel are very likely to encounter the danger of electric shock when approaching or performing related operations without knowing it. Moreover, in the case of being unable to judge the accuracy of the metering data, it is difficult for power companies to accurately evaluate the operating efficiency of the power system and the power consumption of users, which is not conducive to the rational allocation and optimal scheduling of power resources. Therefore, there is an urgent need for a new type of transformer technology to solve these problems existing in traditional transformers and ensure the safe, stable and efficient operation of the power system. Summary of the invention

[0004] The purpose of the present invention is to provide a low voltage primary and secondary fusion current transformer and a self-diagnosis method thereof to solve the problems existing in the above-mentioned prior art.

[0005] To achieve the above object, the technical solution adopted by the present invention is: In a first aspect, the present invention provides a low voltage primary and secondary fusion current transformer, comprising: An external metering CT, a first reference metering CT, a second reference metering CT and a third reference metering CT connected in parallel with the power supply line; A first metrology CT connected to the external metrology CT and the secondary fusion module respectively; a second metrology CT connected to the first reference metrology CT and the secondary fusion module respectively; a third metrology CT connected to the second reference metrology CT and the secondary fusion module respectively; and a fourth metrology CT connected to the third reference metrology CT and the secondary fusion module respectively; Among them, the secondary fusion module is used for self-diagnosis of the operating status of the low-voltage primary and secondary fusion current transformer.

[0006] In a possible implementation, the secondary fusion module includes: a metering module connected to the first metering CT, the second metering CT, the third metering CT and the fourth metering CT, and configured to measure the currents of the first metering CT, the second metering CT, the third metering CT and the fourth metering CT; A communication module, which is used to send the metering data measured by the metering module to the supporting software for remote monitoring; A storage module, which is used for data storage and recording; A temperature measurement module, which is used to monitor the operating temperature of the low-voltage primary and secondary fusion current transformer; An open circuit protection module, which is used to perform open circuit protection when the low-voltage primary and secondary fusion current transformer is in an open circuit state, and quickly reduce the open circuit voltage of the low-voltage primary and secondary fusion current transformer to a safe voltage range; and The main control module is connected to the metering module, the communication module, the storage module, the temperature measurement module, and the open circuit protection module for data processing.

[0007] In a possible implementation, the external metering CT is also externally connected to a metering electric energy meter.

[0008] In a possible implementation, the secondary fusion module is powered by a power supply module.

[0009] In a second aspect, the present invention provides a self-diagnosis method for a low-voltage primary and secondary fusion current transformer, the method being applied to the low-voltage primary and secondary fusion current transformer as described above, the method comprising: Performing current measurement on the first metering CT, the second metering CT, the third metering CT, and the fourth metering CT, that is, performing current measurement on the secondary side currents of the external metering CT, the first reference metering CT, the second reference metering CT, and the third reference metering CT, to obtain four corresponding sets of current measurement data; Compare the three groups of current measurement data corresponding to the second measurement CT, the third measurement CT, and the fourth measurement CT. If the three groups of current measurement data corresponding to the second measurement CT, the third measurement CT, and the fourth measurement CT are within an error range of ±0.2%, output any one of the three groups as measurement benchmark reference data; The metering benchmark reference data is compared with the current metering data corresponding to the first metering CT. If the metering benchmark reference data and the current metering data corresponding to the first metering CT are within an error range of ±0.2%, the operating status of the low-voltage primary-secondary fusion current transformer is output to be normal; otherwise, the operating status of the low-voltage primary-secondary fusion current transformer is output to be abnormal.

[0010] In a possible implementation, the method further includes: In response to the low voltage primary and secondary fusion current transformer being in a working state, temperature monitoring is performed on it; If the monitored temperature is within the range of -40°C to 75°C, the low voltage primary and secondary fusion current transformer is operating normally; If the monitored temperature is lower than -40°C or higher than 75°C, the low-voltage primary-secondary fusion current transformer is in an abnormal operating state, that is, it is in an operating state with excessive metering accuracy.

[0011] In a possible implementation, the method further includes: If at least one of the three groups of current metering data corresponding to the second metering CT, the third metering CT, and the fourth metering CT is greater than 0, and the current metering data corresponding to the first metering CT is 0, then the operating state of the low-voltage primary and secondary fusion current transformer is abnormal, that is, it is in an open circuit state.

[0012] In a possible implementation, the method further includes: The current metering data corresponding to the first metering CT is compared with the current data corresponding to the metering electric energy meter. If the current metering data corresponding to the first metering CT and the current data corresponding to the metering electric energy meter are within an error range of ±0.5%, the current of the metering electric energy meter is normal; otherwise, the current of the metering electric energy meter is abnormal.

[0013] In a third aspect, the present invention provides a computer device, comprising a processor and a memory, wherein the memory stores at least one instruction, at least one program, a code set or an instruction set, and the processor can load and execute at least one instruction, at least one program, a code set or an instruction set to implement the low-voltage primary-secondary fused current transformer and its self-diagnosis method as provided above.

[0014] In a fourth aspect, the present invention provides a computer-readable storage medium, which stores at least one instruction, at least one program, code set or instruction set. The processor can load and execute at least one instruction, at least one program, code set or instruction set to implement the low-voltage primary-secondary fused current transformer and its self-diagnosis method as provided above.

[0015] In a fifth aspect, the present invention provides a computer program product or a computer program, the computer program product or the computer program comprising computer program instructions, the computer program instructions being stored in a computer-readable storage medium. The processor reads the computer instructions from the computer-readable storage medium and executes the computer instructions, so that the computer device executes the low-voltage primary-secondary fusion current transformer and the self-diagnosis method thereof provided above.

[0016] The beneficial effects brought about by the technical solution provided by the present invention include at least: The technical solution provides a low-voltage primary-secondary integrated current transformer that can ensure the safe, stable and efficient operation of the power system, and can monitor the operating status of the transformer in real time. A reference current can be determined by comparing multiple metering CT data, and then the accuracy of the metering data can be judged by comparing the external output current with the reference current, thereby judging whether the transformer and the metering energy meter are faulty, and maintaining and replacing the current transformer and the metering energy meter in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0018] Figure 1 A schematic structural diagram of a low-voltage primary-secondary fusion current transformer provided by an exemplary embodiment of the present invention is shown.

[0019] Figure 2 A schematic flow chart of a self-diagnosis method for a low-voltage primary-secondary fusion current transformer provided by an exemplary embodiment of the present invention is shown.

[0020] Figure 3 A schematic structural diagram of a computer device for executing a self-diagnosis method for a low-voltage primary-secondary fusion current transformer provided by an exemplary embodiment of the present invention is shown.

[0021] 1. External metering CT; 2. First metering CT; 3. First reference metering CT; 4. Second metering CT; 5. Second reference metering CT; 6. Third metering CT; 7. Third reference metering CT; 8. Fourth metering CT; 9. Metering electric energy meter; 10. Secondary fusion module; 11. Power supply module; 101. Metering module; 102. Communication module; 103. Storage module; 104. Temperature measurement module; 105. Open circuit protection module; 106. Main control module. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0024] Figure 1 A structural schematic diagram of a low-voltage primary and secondary fusion current transformer provided by an exemplary embodiment of the present invention is shown, and the low-voltage primary and secondary fusion current transformer includes: an external meter CT1, a first reference meter CT3, a second reference meter CT5, a third reference meter CT7, a first meter CT2, a second meter CT4, a third meter CT6, a fourth meter CT8, and a secondary fusion module 10; the external meter CT1, the first reference meter CT3, the second reference meter CT5 and the third reference meter CT7 are connected in parallel with the power supply line; the first meter CT2 is respectively connected to the external meter CT1 and the secondary fusion module 10; the second meter CT4 is respectively connected to the first reference meter CT3 and the secondary fusion module 10; the third meter CT6 is respectively connected to the second reference meter CT5 and the secondary fusion module 10; the fourth meter CT8 is respectively connected to the third reference meter CT7 and the secondary fusion module 10; wherein the secondary fusion module 10 is used for self-diagnosis of the operating status of the low-voltage primary and secondary fusion current transformer.

[0025] In the field of power, CT is usually the abbreviation of Current Transformer. It is an instrument that converts large primary current into small secondary current for measurement based on the principle of electromagnetic induction, and plays a key role in the power system.

[0026] In the embodiment of the present application, the external metering CT1 is used as an external output CT, outputting a current such as 200 / 5A, and its function is similar to that of a traditional current transformer. It is responsible for converting the large current on the primary side into a small current on the secondary side that can be used by external devices in proportion, and is the key interface for connecting the transformer with the external power system and outputting data. The first reference metering CT3, the second reference metering CT5, and the third reference metering CT7 are used as reference CTs. When an error occurs when comparing the data of a single reference CT with the external output CT, it is difficult to determine the problem. Setting three reference CTs and using multiple reference data for comparison and analysis can improve the accuracy and reliability of the judgment, effectively solve the limitations of a single reference CT, and enhance the accuracy of the transformer operating status diagnosis. The first metering CT2, the second metering CT4, the third metering CT6, and the fourth metering CT8 are used for internal acquisition of the low-voltage one-two fusion current transformer, respectively collecting the secondary currents of the external metering CT1, the first reference metering CT3, the second reference metering CT5, and the third reference metering CT7, providing internal data support for subsequent measurement, diagnosis, and monitoring, and ensuring that the data acquisition of the internal operating status of the transformer is comprehensive and accurate.

[0027] It is worth mentioning that the external metering CT1 is also connected to a metering energy meter 9, which is an extended application of a low-voltage primary and secondary fusion current transformer. By comparing the current data of the transformer itself with the corresponding current data of the metering energy meter 9, it is possible to determine whether the metering energy meter 9 has an abnormal operation, such as a metering problem of the energy meter itself or abnormal electricity use such as electricity theft, which provides an additional monitoring means for the accuracy of electricity metering and electricity safety of the power system. The secondary fusion module 10 is powered by the power module 11.

[0028] Further, the secondary fusion module 10 includes: a metering module 101, a communication module 102, a storage module 103, a temperature measurement module 104, an open circuit protection module 105, and a main control module 106. The metering module 101 is connected to the first metering CT2, the second metering CT4, the third metering CT6 and the fourth metering CT8, and is used to measure the current of the first metering CT2, the second metering CT4, the third metering CT6 and the fourth metering CT8, accurately obtain the current data of each CT inside the transformer, and provide an accurate data basis for subsequent data analysis, operation status judgment and remote monitoring. The communication module 102 is used to send the metering data measured by the metering module 101 to the supporting software for remote monitoring, realize the remote transmission and real-time monitoring of the transformer data, facilitate the power operation and maintenance personnel to timely understand and manage the operation status of the transformer remotely, and improve the efficiency and convenience of power system operation and maintenance. The storage module 103 is used for data storage and recording, and saves various types of data during the operation of the transformer. These historical data can be used for subsequent data analysis, fault tracing and performance evaluation, and provide data basis for the optimization and improvement of the power system. The temperature measurement module 104 is used to monitor the operating temperature of the low-voltage primary and secondary fusion current transformer. Temperature is one of the important parameters reflecting the operating state of the transformer. By real-time monitoring of the temperature, it is possible to timely discover temperature anomalies caused by overload, poor heat dissipation, etc., and to warn potential failure risks in advance to ensure the safe and stable operation of the transformer. The open circuit protection module 105 is used to perform open circuit protection when the low-voltage primary and secondary fusion current transformer is in an open circuit state, quickly reduce the open circuit voltage to a safe voltage range, effectively avoid the harm caused by the high voltage generated by the open circuit to equipment and personnel, and ensure the safe operation of the power system and personnel safety. The main control module 106 is connected to the metering module 101, the communication module 102, the storage module 103, the temperature measurement module 104, and the open circuit protection module 105, and is responsible for data processing. It integrates and coordinates the work of each module, performs comprehensive analysis and judgment based on the data provided by different modules, controls the operation logic of the entire secondary fusion module 10, and is the core control unit of the secondary fusion module 10.

[0029] In one example, the main control module 106 is implemented as a CPU with an embedded operating system, which can run the embedded operating system and implement multi-tasking. The metering module 101 uses a professional metering chip.

[0030] Figure 2 A flow chart of a self-diagnosis method for a low-voltage primary-secondary fusion current transformer provided by an exemplary embodiment of the present invention is shown. The self-diagnosis method for a low-voltage primary-secondary fusion current transformer is applied to the low-voltage primary-secondary fusion current transformer as described above. The method comprises the following steps: Step 201, current metering is performed on the first metering CT, the second metering CT, the third metering CT, and the fourth metering CT, that is, current metering is performed on the secondary side currents of the external metering CT, the first reference metering CT, the second reference metering CT, and the third reference metering CT to obtain four corresponding sets of current metering data.

[0031] In an embodiment of the present application, the first metering CT, the second metering CT, the third metering CT, and the fourth metering CT are current-metered by the above-mentioned metering module, and the secondary currents of the external metering CT, the first reference metering CT, the second reference metering CT, and the third reference metering CT are accurately collected to provide original information for a comprehensive analysis of the operating status of the transformer. The external metering CT is used to output current data to the outside, and the reference metering CT is used to provide reference data. Collecting their secondary current data can reflect the working conditions of the low-voltage primary and secondary fusion current transformer from multiple angles. Four sets of current metering data are obtained to ensure the integrity of the data. Multiple data sources verify each other, reducing the risk of diagnostic errors caused by errors or failures in a single data. For example, if a CT has a temporary failure, the data of other CTs can be used as a supplementary reference to ensure the accuracy of the diagnosis.

[0032] Step 202, compare the three groups of current metering data corresponding to the second metering CT, the third metering CT, and the fourth metering CT. If the three groups of current metering data corresponding to the second metering CT, the third metering CT, and the fourth metering CT are within an error range of ±0.2%, output any one of the three groups as metering benchmark reference data.

[0033] In the embodiment of the present application, multiple groups of data are cross-validated through the main control module, thereby improving the reliability of the metrology benchmark reference data used for subsequent comparison.

[0034] Step 203, comparing the metering reference data with the current metering data corresponding to the first metering CT. If the metering reference data and the current metering data corresponding to the first metering CT are within an error range of ±0.2%, the operating state of the output low-voltage primary-secondary fusion current transformer is normal; otherwise, the operating state of the output low-voltage primary-secondary fusion current transformer is abnormal.

[0035] In an embodiment of the present application, the metering benchmark reference data is compared with the current metering data corresponding to the first metering CT through the main control module, which directly reflects whether the first metering CT data output to the outside is consistent with the reference data, thereby judging whether the transformer has problems such as abnormal transformation ratio and excessive error. If the errors of the two are out of range, it means that the transformer may have an internal fault, which affects the accurate metering and stable operation of the power system. The communication module outputs normal or abnormal operating status signals to the supporting software in a timely and accurate manner, allowing operation and maintenance personnel to respond quickly. Once an abnormal operating status is found, inspection and maintenance can be arranged in time to avoid further expansion of the fault and ensure the stable power supply of the power system.

[0036] In some embodiments, the self-diagnosis method of the low voltage primary and secondary fusion current transformer also includes: in response to the low voltage primary and secondary fusion current transformer being in a working state, temperature monitoring is performed on it; if the monitored temperature is in the range of -40°C to 75°C, the operating state of the low voltage primary and secondary fusion current transformer is normal; if the monitored temperature is lower than -40°C or higher than 75°C, the operating state of the low voltage primary and secondary fusion current transformer is abnormal, that is, it is in an operating state with excessive metering accuracy.

[0037] In an embodiment of the present application, temperature monitoring is performed when the transformer is working through a temperature measurement module, because temperature is an important factor affecting the performance of the transformer. The normal operating temperature range is between -40°C and 75°C. If it exceeds this range, it indicates that the transformer may have problems such as poor heat dissipation and overload, which will cause the measurement accuracy to exceed the tolerance. For example, excessively high temperature may reduce the performance of the insulating material inside the transformer, affect the turns ratio of the coil, and thus increase the measurement error. Through temperature monitoring, potential problems can be discovered in advance before a serious fault occurs in the transformer, and they can be transmitted to the supporting software in a timely manner through the communication module, allowing operation and maintenance personnel to respond quickly. When the temperature is abnormal, timely measures such as cooling and load adjustment can be taken to avoid equipment damage and extend the service life of the transformer.

[0038] In some embodiments, the self-diagnosis method of the low-voltage primary and secondary fused current transformer also includes: if at least one of the three groups of current metering data corresponding to the second metering CT, the third metering CT, and the fourth metering CT is greater than 0, and the current metering data corresponding to the first metering CT is 0, then the operating state of the low-voltage primary and secondary fused current transformer is abnormal, that is, it is in an open circuit state.

[0039] In the embodiment of the present application, an open circuit of the current transformer will generate high voltage, endangering the safety of equipment and personnel. This judgment method can quickly and accurately detect the open circuit fault, trigger the open circuit protection mechanism in time, perform open circuit protection through the open circuit protection module, and quickly reduce the open circuit voltage to a safe voltage range, effectively avoiding the harm to equipment and personnel caused by the high voltage generated by the open circuit, and ensuring the safe operation of the power system and the safety of personnel.

[0040] In some embodiments, the self-diagnosis method of the low-voltage primary and secondary fused current transformer also includes: comparing the current metering data corresponding to the first metering CT with the current data corresponding to the metering electric energy meter; if the current metering data corresponding to the first metering CT and the current data corresponding to the metering electric energy meter are within an error range of ±0.5%, the current of the metering electric energy meter is normal; otherwise, the current of the metering electric energy meter is abnormal.

[0041] In the embodiment of the present application, this step is directly related to the accuracy of electric energy measurement. If the error between the two exceeds the range of ±0.5%, there may be abnormal behavior such as electric energy meter failure or power theft. Accurate electric energy measurement is the basis for power companies to bill and users to use electricity fairly. Through this comparison, electric energy measurement problems can be discovered and solved in a timely manner.

[0042] Figure 3 A schematic diagram of the structure of a computer device for executing a self-diagnosis method of a low-voltage primary-secondary fusion current transformer provided by an exemplary embodiment of the present invention is shown, and the computer device includes: The processor 301 includes one or more processing cores. The processor 301 executes various functional applications and data processing by running software programs and modules.

[0043] The receiver 302 and the transmitter 303 can be implemented as a communication component, and the communication component can be a communication chip. Optionally, the communication component can be implemented to include a signal transmission function. That is, the transmitter 303 can be used to transmit a control signal to the image acquisition device and the scanning device, and the receiver 302 can be used to receive the corresponding feedback instruction.

[0044] The memory 304 is connected to the processor 301 via a bus 305 .

[0045] The memory 304 may be used to store at least one instruction, and the processor 301 may be used to execute the at least one instruction to implement each step in the above method embodiment.

[0046] An embodiment of the present invention also provides a computer-readable storage medium, which stores at least one instruction, at least one program, code set or instruction set, which is loaded and executed by a processor to implement the self-diagnosis method of the low-voltage primary and secondary fusion current transformer.

[0047] The present invention also provides a computer program product or a computer program, which includes a computer instruction stored in a computer-readable storage medium. A processor of a computer device reads the computer instruction from the computer-readable storage medium, and the processor executes the computer instruction, so that the computer device executes the self-diagnosis method of the low-voltage primary-secondary fusion current transformer described in any of the above embodiments.

[0048] Optionally, the computer readable storage medium may include: a read-only memory (ROM), a random access memory (RAM), a solid state drive (SSD), or an optical disk. Among them, the random access memory may include a resistance random access memory (ReRAM) and a dynamic random access memory (DRAM). The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages and disadvantages of the embodiments.

[0049] It should be understood that the specific examples herein are only intended to help those skilled in the art to better understand the present disclosure, rather than to limit the scope of the present invention.

[0050] It is understood that in the various implementations of this specification, the size of the sequence number of each process does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the present disclosure.

[0051] It can be understood that the various implementation modes described in this specification can be implemented individually or in combination, and the present disclosure is not limited to this.

[0052] Unless otherwise stated, all technical and scientific terms used in this disclosure have the same meaning as those generally understood by those skilled in the art of the technical field of this specification. The terms used in this specification are only for the purpose of describing specific embodiments and are not intended to limit the scope of this specification. The term "and / or" used in this specification includes any and all combinations of one or more related listed items. The singular forms of "a", "above", and "the" used in this disclosure and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0053] It can be understood that the processor of the present disclosure can be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method implementation method can be completed by the hardware integrated logic circuit or software instructions in the processor. The above processor can be a general processor, a digital signal processor (DigitalSignalProcessor, DSP), an application-specific integrated circuit (Application Specific Integrated Circuit, ASIC), a field programmable gate array (Field Programmable Gate Array, FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in the present disclosure can be implemented or executed. The general processor can be a microprocessor or the processor can also be any conventional processor, etc. The steps of the method disclosed in the present disclosure can be directly embodied as a hardware decoding processor to perform, or the hardware and software modules in the decoding processor can be combined to perform. The software module can be located in a mature storage medium in the field such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

[0054] It is understood that the memory in the present disclosure may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (programmable ROM, PROM), an erasable programmable read-only memory (erasable PROM, EPROM), an electrically erasable programmable read-only memory (EEPROM) or a flash memory. The volatile memory may be a random access memory (RAM). It should be noted that the memory of the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0055] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this specification.

[0056] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method implementation methods and will not be repeated here.

[0057] In the several embodiments provided in this specification, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device implementation described above is only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0058] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0059] In addition, each functional unit in each embodiment of the present specification may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0060] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this specification, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the method described in each embodiment of this specification. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk, etc., various media that can store program codes.

[0061] The above is only a specific implementation of this specification, but the protection scope of the present invention is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in this specification, which should be included in the protection scope of this specification. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A low voltage primary and secondary fusion current transformer, characterized in that: include: An external metering CT (1), a first reference metering CT (3), a second reference metering CT (5) and a third reference metering CT (7) connected in parallel to the power supply line; A first metering CT (2) connected to the external metering CT (1) and the secondary fusion module (10) respectively; a second metrology CT (4) connected to the first reference metrology CT (3) and the secondary fusion module (10) respectively; a third metrology CT (6) connected to the second reference metrology CT (5) and the secondary fusion module (10), respectively; and a fourth metrology CT (8) connected to the third reference metrology CT (7) and the secondary fusion module (10) respectively; The secondary fusion module (10) is used for self-diagnosis of the operating status of the low-voltage primary-secondary fusion current transformer.

2. The low voltage primary and secondary fusion current transformer according to claim 1, characterized in that: The secondary fusion module (10) comprises: a metering module (101), connected to the first metering CT (2), the second metering CT (4), the third metering CT (6) and the fourth metering CT (8), and used for measuring the current of the first metering CT (2), the second metering CT (4), the third metering CT (6) and the fourth metering CT (8); A communication module (102) is used to send the metering data measured by the metering module (101) to a supporting software for remote monitoring; A storage module (103), which is used for data storage and recording; A temperature measurement module (104), which is used to monitor the operating temperature of the low-voltage primary and secondary fusion current transformer; An open circuit protection module (105), which is used to perform open circuit protection when the low-voltage primary and secondary fusion current transformer is in an open circuit state, and quickly reduce the open circuit voltage of the low-voltage primary and secondary fusion current transformer to a safe voltage range; and A main control module (106) is connected to the metering module (101), the communication module (102), the storage module (103), the temperature measurement module (104), and the open circuit protection module (105) and is used for data processing.

3. The low voltage primary and secondary fusion current transformer according to claim 1, characterized in that: The external metering CT (1) is also externally connected to a metering electric energy meter (9).

4. The low voltage primary and secondary fusion current transformer according to claim 1, characterized in that: The secondary fusion module (10) is powered by a power supply module (11).

5. A self-diagnosis method for a low-voltage primary-secondary fusion current transformer, the method being applied to the low-voltage primary-secondary fusion current transformer according to any one of claims 1 to 4, characterized in that: The method comprises: Performing current measurement on the first metering CT, the second metering CT, the third metering CT, and the fourth metering CT, that is, performing current measurement on the secondary side currents of the external metering CT, the first reference metering CT, the second reference metering CT, and the third reference metering CT, to obtain four corresponding sets of current measurement data; Compare the three groups of current measurement data corresponding to the second measurement CT, the third measurement CT, and the fourth measurement CT. If the three groups of current measurement data corresponding to the second measurement CT, the third measurement CT, and the fourth measurement CT are within an error range of ±0.2%, output any one of the three groups as measurement benchmark reference data; The metering benchmark reference data is compared with the current metering data corresponding to the first metering CT. If the metering benchmark reference data and the current metering data corresponding to the first metering CT are within an error range of ±0.2%, the operating status of the low-voltage primary-secondary fusion current transformer is output to be normal; otherwise, the operating status of the low-voltage primary-secondary fusion current transformer is output to be abnormal.

6. The self-diagnosis method of low voltage primary and secondary fusion current transformer according to claim 5, characterized in that: The method further comprises: In response to the low voltage primary and secondary fusion current transformer being in a working state, temperature monitoring is performed on it; If the monitored temperature is within the range of -40°C to 75°C, the low voltage primary and secondary fusion current transformer is operating normally; If the monitored temperature is lower than -40°C or higher than 75°C, the low-voltage primary-secondary fusion current transformer is in an abnormal operating state, that is, it is in an operating state with excessive metering accuracy.

7. The self-diagnosis method of low voltage primary and secondary fusion current transformer according to claim 5, characterized in that: The method further comprises: If at least one of the three groups of current metering data corresponding to the second metering CT, the third metering CT, and the fourth metering CT is greater than 0, and the current metering data corresponding to the first metering CT is 0, then the operating state of the low-voltage primary and secondary fusion current transformer is abnormal, that is, it is in an open circuit state.

8. The self-diagnosis method of low voltage primary and secondary fusion current transformer according to claim 5, characterized in that: The method further comprises: The current metering data corresponding to the first metering CT is compared with the current data corresponding to the metering electric energy meter. If the current metering data corresponding to the first metering CT and the current data corresponding to the metering electric energy meter are within an error range of ±0.5%, the current of the metering electric energy meter is normal; otherwise, the current of the metering electric energy meter is abnormal.

9. A computer device, characterized in that: The computer device includes a processor and a memory, wherein the memory stores at least one instruction, at least one program, code set or instruction set, and the at least one instruction, at least one program, code set or instruction set is loaded and executed by the processor to implement the low-voltage primary-secondary fusion current transformer and its self-diagnosis method as described in any one of claims 1 to 8.

10. A computer-readable storage medium, characterized in that: The readable storage medium stores at least one instruction, at least one program, code set or instruction set, and the at least one instruction, at least one program, code set or instruction set is loaded and executed by the processor to implement the low-voltage primary-secondary fusion current transformer and its self-diagnosis method as described in any one of claims 1 to 8.

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