Current transformer characteristic analysis method and system, terminal equipment and storage medium

Abstract

The invention discloses a current transformer characteristic analysis method and system, terminal equipment and a storage medium, and relates to the technical field of power equipment performance tests.The method comprises the steps that different current transformer working states and load states and different voltage grades of extreme geomagnetically induced current are specified; and simulating that the current transformer suffers from invasion of different levels of extreme geomagnetic induction current in different working states and load states, collecting a primary side current waveform and a secondary side current of the current transformer, and analyzing to obtain excitation characteristics and transmission characteristics of the current transformer under the action of the extreme geomagnetic induction current. According to the method, a basis can be provided for characteristic analysis of the current transformer considering extreme geomagnetic induction current, the technical vacancy of effect characteristic analysis of the current transformer under the influence of extreme geomagnetic induction in the prior art is filled, and the method has important significance for improving the operation reliability of the current transformer.

Description

Technical Field

[0001] The present invention relates to the technical field of power equipment performance testing, and in particular to a current transformer characteristic analysis method, system, terminal equipment and storage medium. Background Art

[0002] Current transformers (CTs) convert high-current signals in the power grid into low-current signals, providing standardized current signals for system measurement, metering, and monitoring. The operating state and operating environment of CTs directly impact the rationality and accuracy of energy metering and the correctness of relay protection. Extreme geomagnetic induction currents flowing through CTs can alter their transmission characteristics and operating state, leading to significant deviations in current measurement, affecting relay protection and threatening grid safety.

[0003] While extensive research and analysis has been conducted both domestically and internationally on the effects of DC bias on transformer losses, temperature rise, and vibration, there has been limited research on the characteristics of current transformers, leading to a lack of clarity regarding the effects of current transformers under extreme geomagnetic induction. Research on the effects of current transformers requires analysis of their transmission and excitation characteristics under extreme geomagnetic induction. Therefore, a method for analyzing the effects of current transformers under extreme geomagnetic induction is urgently needed. Summary of the Invention

[0004] The present invention provides a current transformer characteristic analysis method, system, terminal device and storage medium to solve the technical gap in the prior art for analyzing the effect characteristics of a current transformer under the influence of extreme geomagnetic induction.

[0005] To solve the above technical problems, an embodiment of the present invention provides a current transformer characteristic analysis method applicable to a current transformer characteristic analysis system; the current transformer characteristic analysis system includes: an adjustable current source, an extreme geomagnetic induction current simulation injection source, a current transformer to be analyzed, an adjustable load, and a data acquisition and analysis device; the adjustable current source is connected to the primary side of the current transformer; the extreme geomagnetic induction current simulation injection source is connected to the primary side of the current transformer and in parallel with the adjustable current source; the adjustable load is connected to the secondary side of the current transformer; the extreme geomagnetic induction current simulation injection source is composed of a capacitor bank and a resistor cabinet connected in series;

[0006] The current transformer characteristic analysis method comprises:

[0007] Obtaining a specified working state and a specified load state of the current transformer, and obtaining a specified current level of the extreme geomagnetic induction current to be simulated; wherein the working state includes: normal, near saturation, and saturation; and the load state includes: light load, rated, and overload;

[0008] Determining a corresponding operating current setting interval according to the specified working state; and adjusting the operating current output by the adjustable current source according to the operating current setting interval;

[0009] Determining a corresponding load setting interval according to the specified load state; and adjusting a load value of the adjustable load according to the load setting interval;

[0010] determining a target charging voltage corresponding to the current level according to the specified current level and the resistance value of the resistor cabinet; controlling the capacitor bank to charge to the target charging voltage, and then controlling the capacitor bank to output an extreme magnetic induction simulated current to the current transformer;

[0011] The data acquisition and analysis device is used to collect the primary side current data and the secondary side current data of the current transformer; and the excitation characteristics and the transmission characteristics of the current transformer are determined based on the primary side current data and the secondary side current data.

[0012] As a preferred solution, determining the excitation characteristics and transmission characteristics of the current transformer based on the primary side current data and the secondary side current data includes:

[0013] Converting the primary side current data to the secondary side to obtain converted current data;

[0014] Calculating a difference between the converted current data and the secondary side current data to obtain an excitation characteristic of the current transformer;

[0015] Performing a Fourier transform on the converted current data to obtain a first fundamental wave amplitude and a first phase of the converted current data; performing a Fourier transform on the secondary side current data to obtain a second fundamental wave amplitude and a second phase of the secondary side current data;

[0016] An amplitude error between the first fundamental wave amplitude and the second fundamental wave amplitude, and a phase error between the first phase and the second phase are calculated; and a transmission characteristic of the current transformer is obtained according to the amplitude error and the phase error.

[0017] As a preferred solution, the collecting of the primary side current data and the secondary side current data of the current transformer includes:

[0018] collecting the extreme geomagnetic induction simulated current value output by the extreme geomagnetic induction current simulated injection source;

[0019] When the extreme geomagnetic induction analog current value is greater than or equal to a preset current amplitude threshold, the primary side current data and the secondary side current data of the current transformer are collected.

[0020] As a preferred solution, the data acquisition and analysis device includes: a current clamp and a data analysis module; the current clamp is used to collect current data.

[0021] Based on the above embodiment, another embodiment of the present invention provides a current transformer characteristic analysis system, comprising: an adjustable current source, an extreme geomagnetic induction current simulation injection source, a current transformer to be analyzed, an adjustable load, and a data acquisition and analysis device;

[0022] The adjustable current source is connected to the primary side of the current transformer; the extreme geomagnetic induction current simulation injection source is connected to the primary side of the current transformer; the adjustable current source and the extreme geomagnetic induction current simulation injection source are connected in parallel; the adjustable load is connected to the secondary side of the current transformer;

[0023] The adjustable current source is used to output an operating current whose effective value is adjustable;

[0024] The extreme geomagnetic induction current simulation injection source includes: a resistor cabinet and a capacitor bank; the resistor cabinet and the capacitor bank are connected in series; the capacitor bank is used to store electricity and output the extreme geomagnetic induction simulation current to the current transformer;

[0025] The adjustable load is used to provide an adjustable load for the current transformer;

[0026] The data acquisition and analysis device is used to collect the primary side current data and the secondary side current data of the current transformer; and determine the excitation characteristics and the transmission characteristics of the current transformer based on the primary side current data and the secondary side current data.

[0027] As a preferred solution, determining the excitation characteristics and transmission characteristics of the current transformer based on the primary side current data and the secondary side current data includes:

[0028] Converting the primary side current data to the secondary side to obtain converted current data;

[0029] Calculating a difference between the converted current data and the secondary side current data to obtain an excitation characteristic of the current transformer;

[0030] Performing a Fourier transform on the converted current data to obtain a first fundamental wave amplitude and a first phase of the converted current data; performing a Fourier transform on the secondary side current data to obtain a second fundamental wave amplitude and a second phase of the secondary side current data;

[0031] An amplitude error between the first fundamental wave amplitude and the second fundamental wave amplitude, and a phase error between the first phase and the second phase are calculated; and a transmission characteristic of the current transformer is obtained according to the amplitude error and the phase error.

[0032] As a preferred solution, the collecting of the primary side current data and the secondary side current data of the current transformer includes:

[0033] collecting the extreme geomagnetic induction simulated current value output by the extreme geomagnetic induction current simulated injection source;

[0034] When the extreme geomagnetic induction analog current value is greater than or equal to a preset current amplitude threshold, the primary side current data and the secondary side current data of the current transformer are collected.

[0035] As a preferred solution, the data acquisition and analysis device includes: a current clamp and a data analysis module; the current clamp is used to collect current data.

[0036] Based on the above embodiments, another embodiment of the present invention provides a terminal device, which includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, the current transformer characteristic analysis method described in the above embodiment of the invention is implemented.

[0037] Based on the above embodiment, another embodiment of the present invention provides a storage medium, which includes a stored computer program, wherein when the computer program is running, the device where the storage medium is located is controlled to execute the current transformer characteristic analysis method described in the above embodiment of the invention.

[0038] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0039] By specifying different current transformer operating states and load states, as well as different extreme geomagnetic induction current voltage levels, the present invention can simulate a current transformer under different operating and load conditions experiencing different levels of extreme geomagnetic induction current intrusion, collect the current transformer's primary and secondary current waveforms, and analyze the current transformer's excitation and transmission characteristics under the influence of extreme geomagnetic induction current. This invention can provide a basis for analyzing current transformer characteristics taking extreme geomagnetic induction current into account, filling a technical gap in the prior art for analyzing the effect characteristics of current transformers under the influence of extreme geomagnetic induction, and is of great significance for improving the operational reliability of current transformers. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 11 is a flow chart of a current transformer characteristic analysis method provided by one embodiment of the present invention;

[0041] Figure 2 1 is a schematic structural diagram of a current transformer characteristic analysis system provided by one embodiment of the present invention;

[0042] The reference numerals of the drawings in the specification are as follows: adjustable current source 1 , extreme geomagnetic induction current simulation injection source 2 , current transformer 3 , and adjustable load 4 . DETAILED DESCRIPTION

[0043] To make the objectives, technical solutions, and advantages of this application more clear, the technical solutions in this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the term "include" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0045] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0046] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0047] In the description of the embodiments of this application, unless otherwise specified or limited, the technical term "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication between two components or the interaction between two components. For those of ordinary skill in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0048] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0049] Example 1

[0050] Please refer to Figure 1 , which is a flow chart of a current transformer characteristic analysis method provided by one embodiment of the present invention, wherein the current transformer characteristic analysis method is applicable to a current transformer characteristic analysis system; the current transformer characteristic analysis system comprises: an adjustable current source, an extreme geomagnetic induction current simulation injection source, a current transformer to be analyzed, an adjustable load and a data acquisition and analysis device; the adjustable current source is connected to the primary side of the current transformer; the extreme geomagnetic induction current simulation injection source is connected to the primary side of the current transformer and is connected in parallel with the adjustable current source; the adjustable load is connected to the secondary side of the current transformer; the extreme geomagnetic induction current simulation injection source is composed of a capacitor bank and a resistor cabinet connected in series.

[0051] The current transformer characteristic analysis method comprises:

[0052] S1. Obtain a specified working state and a specified load state of the current transformer, and obtain a specified current level of the extreme geomagnetic induction current to be simulated; wherein the working state includes: normal, near saturation, and saturation; and the load state includes: light load, rated, and overload.

[0053] It should be noted that the present invention uses a 10kV voltage level true current transformer to simulate the actual situation of power equipment in operation.

[0054] In one embodiment, the current transformer is a LZZBJ9-10 current transformer.

[0055] S2. Determine a corresponding operating current setting interval according to the specified working state; and adjust the operating current output by the adjustable current source according to the operating current setting interval.

[0056] It should be noted that the adjustable current source is an AC current source, which provides power for the operation of the current transformer and can achieve adjustable output current effective value, so that the working state of the current transformer is adjustable.

[0057] S3. Determine a corresponding load setting interval according to the specified load state; and adjust the load value of the adjustable load according to the load setting interval.

[0058] It should be noted that the load is composed of resistors with different resistance values and inductors with different inductance values, which provides a load for the current transformer, making the working state of the current transformer adjustable and the load power factor adjustable.

[0059] In step S3, the load condition of the current transformer is set. If the current transformer needs to be in an overload state, the load impedance needs to be greater than the rated load impedance; if the current transformer needs to be in a rated state, the load impedance needs to be the rated load impedance; if the current transformer needs to be in a light load state, the load impedance needs to be less than 25% of the rated load impedance, and the load resistance value and inductance value are set according to the load impedance value.

[0060] S4. Determine a target charging voltage corresponding to the current level according to the specified current level and the resistance value of the resistance cabinet; after controlling the capacitor bank to charge to the target charging voltage, control the capacitor bank to output an extreme magnetic induction simulated current to the current transformer.

[0061] It should be noted that the extreme geomagnetic induction current simulation injection source is used to simulate different levels of extreme geomagnetic induction currents. Extreme geomagnetic energy is accumulated and released by charging and discharging the capacitor bank, and the extreme geomagnetic induction current injection level is adjusted by adjusting the charging voltage.

[0062] In step S4, the extreme geomagnetic induction current level is set, and the impact of the extreme geomagnetic induction current on the current transformer is used as the standard for dividing the level. When the current amplitude is less than 50A, it is a mild extreme geomagnetic induction current, which will cause the current transformer to be slightly magnetically saturated; when the current amplitude is greater than 50A and less than 300A, it is a moderate extreme geomagnetic induction current, which will cause the current transformer relay protection to refuse to operate; when the current amplitude is greater than 300A, it is a severe extreme geomagnetic induction current, which will cause the current transformer to be deeply saturated, threatening the safe operation of the current transformer.

[0063] S5. Collect the primary-side current data and the secondary-side current data of the current transformer through the data acquisition and analysis device; determine the excitation characteristics and the transmission characteristics of the current transformer based on the primary-side current data and the secondary-side current data.

[0064] It should be noted that the data acquisition and analysis device obtains the current transformer transmission characteristics from the rapidly changing current waveform data, which can evaluate the working status of the current transformer taking into account the effect of extreme geomagnetic induction current, which is of great significance for improving the operating reliability of the current transformer.

[0065] In a preferred embodiment, determining the excitation characteristics and the transmission characteristics of the current transformer based on the primary side current data and the secondary side current data includes:

[0066] Converting the primary side current data to the secondary side to obtain converted current data;

[0067] Calculating a difference between the converted current data and the secondary side current data to obtain an excitation characteristic of the current transformer;

[0068] Performing a Fourier transform on the converted current data to obtain a first fundamental wave amplitude and a first phase of the converted current data; performing a Fourier transform on the secondary side current data to obtain a second fundamental wave amplitude and a second phase of the secondary side current data;

[0069] An amplitude error between the first fundamental wave amplitude and the second fundamental wave amplitude, and a phase error between the first phase and the second phase are calculated; and a transmission characteristic of the current transformer is obtained according to the amplitude error and the phase error.

[0070] In a preferred embodiment, the collecting of the primary side current data and the secondary side current data of the current transformer includes:

[0071] collecting the extreme geomagnetic induction simulated current value output by the extreme geomagnetic induction current simulated injection source;

[0072] When the extreme geomagnetic induction analog current value is greater than or equal to a preset current amplitude threshold, the primary side current data and the secondary side current data of the current transformer are collected.

[0073] It should be noted that the current amplitude threshold is 50% of the specified current level.

[0074] In this embodiment, the trigger mode of the data acquisition operation is set based on the specified current level, and a pulse trigger mode is adopted. When the extreme geomagnetic induction current measurement channel detects a current value greater than or equal to 50% of the specified current level, the data acquisition operation is triggered to ensure complete current data acquisition. If the trigger is too early or too late, the waveform recording will be incomplete.

[0075] In a preferred embodiment, the data acquisition and analysis device includes: a current clamp and a data analysis module; the current clamp is used to collect current data.

[0076] It should be noted that the current clamp is used to collect primary and secondary current data from a current transformer, as well as the extreme geomagnetic induction current simulation output by an extreme geomagnetic induction current simulation injection source. This invention addresses the problem that traditional current measurement equipment may experience magnetic bias under the influence of extreme geomagnetic induction current, making it inaccurately measuring current. By using the current clamp to measure current, the current transformer's primary and secondary currents can be accurately obtained.

[0077] In one embodiment, the data acquisition and analysis device further includes: an oscilloscope module for displaying the primary side current data and the secondary side current data of the current transformer and having a data storage function. The oscilloscope module is an eight-channel oscilloscope.

[0078] In one embodiment, the data acquisition and analysis device is further configured to determine the operating status of the current transformer based on the amplitude error and the phase error. Taking the LZZBJ9-10 current transformer selected in the present invention as an example, when the absolute value of the amplitude error is no greater than 5% and the absolute value of the phase error is no greater than 180°, the current transformer operates in the linear region; when the absolute value of the amplitude error is greater than 5% but less than 15% and the absolute value of the phase error is greater than 180° but less than 360°, the current transformer operates in the critical saturation region; and when the absolute value of the amplitude error is greater than 15% and the phase error is greater than 360°, the current transformer operates in the deep saturation region. By comparing the characteristic parameters with the current transformer error threshold specified in the standard, it is determined whether the current transformer can measure current within the error threshold under the influence of extreme geomagnetic induction current.

[0079] It should also be noted that the present invention can simulate the effect characteristics of the current transformer when it is invaded by different levels of extreme geomagnetic induced current by specifying different current transformer working states and load states, as well as specifying different voltage levels of extreme geomagnetic induced currents, collect the extreme geomagnetic induced current waveform, the current transformer primary side current waveform and the secondary side current waveform, and obtain the changes in the current transformer characteristics under the action of extreme geomagnetic induced current, so as to evaluate the operating conditions of the current transformer under the action of extreme geomagnetic induced current, which can provide a basis for the analysis of the current transformer characteristics taking into account the extreme geomagnetic induced current, and is of great significance for improving the operating reliability of the current transformer.

[0080] Example 2

[0081] Please refer to Figure 2 , which is a schematic structural diagram of a current transformer 3 characteristic analysis system provided by one embodiment of the present invention, comprising: an adjustable current source 1, an extreme geomagnetic induction current simulation injection source 2, a current transformer 3 to be analyzed, an adjustable load 4, and a data acquisition and analysis device;

[0082] The adjustable current source 1 is connected to the primary side of the current transformer 3; the extreme geomagnetic induction current simulation injection source 2 is connected to the primary side of the current transformer 3; the adjustable current source 1 and the extreme geomagnetic induction current simulation injection source 2 are connected in parallel; the adjustable load 4 is connected to the secondary side of the current transformer 3;

[0083] The adjustable current source 1 is used to output an operating current whose effective value is adjustable;

[0084] The extreme geomagnetic induction current simulation injection source 2 includes: a resistor cabinet and a capacitor bank; the resistor cabinet and the capacitor bank are connected in series; the capacitor bank is used to store electricity and output the extreme geomagnetic induction simulation current to the current transformer 3;

[0085] The adjustable load 4 is used to provide an adjustable load for the current transformer 3;

[0086] The data acquisition and analysis device is used to collect the primary side current data and the secondary side current data of the current transformer 3; and determine the excitation characteristics and transmission characteristics of the current transformer 3 based on the primary side current data and the secondary side current data.

[0087] In a preferred embodiment, determining the excitation characteristics and transmission characteristics of the current transformer 3 based on the primary side current data and the secondary side current data includes:

[0088] Converting the primary side current data to the secondary side to obtain converted current data;

[0089] Calculating the difference between the converted current data and the secondary side current data to obtain the excitation characteristics of the current transformer 3;

[0090] Performing a Fourier transform on the converted current data to obtain a first fundamental wave amplitude and a first phase of the converted current data; performing a Fourier transform on the secondary side current data to obtain a second fundamental wave amplitude and a second phase of the secondary side current data;

[0091] An amplitude error between the first fundamental wave amplitude and the second fundamental wave amplitude, and a phase error between the first phase and the second phase are calculated; and a transmission characteristic of the current transformer 3 is obtained according to the amplitude error and the phase error.

[0092] In a preferred embodiment, the collecting of the primary side current data and the secondary side current data of the current transformer 3 includes:

[0093] collecting the extreme geomagnetic induction simulated current value output by the extreme geomagnetic induction current simulated injection source 2;

[0094] When the extreme geomagnetic induction analog current value is greater than or equal to a preset current amplitude threshold, the primary side current data and the secondary side current data of the current transformer 3 are started to be collected.

[0095] In a preferred embodiment, the data acquisition and analysis device includes: a current clamp and a data analysis module; the current clamp is used to collect current data.

[0096] Example 3

[0097] Accordingly, an embodiment of the present invention provides a terminal device, which includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, it implements the current transformer characteristic analysis method described in the above-mentioned embodiment of the invention.

[0098] Example 4

[0099] Accordingly, an embodiment of the present invention provides a storage medium, which includes a stored computer program, wherein when the computer program is running, the device where the storage medium is located is controlled to execute the current transformer characteristic analysis method described in the above embodiment of the invention.

[0100] It should be noted that the system embodiment described above is merely illustrative, wherein the units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed across multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment. In addition, in the drawings of the system embodiment provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, which may be specifically implemented as one or more communication buses or signal lines. A person of ordinary skill in the art can understand and implement the present invention without inventive effort.

[0101] Those skilled in the art will clearly understand that for the sake of convenience and brevity, the specific working process of the system described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0102] The terminal device may be a computing device such as a desktop computer, a notebook computer, a PDA, a cloud server, etc. The terminal device may include, but is not limited to, a processor and a memory.

[0103] The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc. The processor is the control center of the device, connecting various parts of the entire device using various interfaces and lines.

[0104] The memory can be used to store the computer program, and the processor realizes various functions of the device by running or executing the computer program stored in the memory and calling the data stored in the memory. The memory can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, at least one application required for a function, etc.; the data storage area can store data created according to the use of the mobile phone, etc. In addition, the memory can include a high-speed random access memory and can also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (FlashCard), at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0105] The storage medium is a storage medium, and the computer program is stored in the storage medium. When the computer program is executed by the processor, it can implement the steps of the above-mentioned various method embodiments. The computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or system that can carry the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electric carrier signals and telecommunication signals.

[0106] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A current transformer characteristic analysis method, characterized in that: Applicable to current transformer characteristic analysis system; The current transformer characteristic analysis system includes: an adjustable current source, an extreme geomagnetic induction current simulation injection source, a current transformer to be analyzed, an adjustable load, and a data acquisition and analysis device; the adjustable current source is connected to the primary side of the current transformer; the extreme geomagnetic induction current simulation injection source is connected to the primary side of the current transformer and connected in parallel with the adjustable current source; the adjustable load is connected to the secondary side of the current transformer; the extreme geomagnetic induction current simulation injection source is composed of a capacitor bank and a resistor cabinet connected in series; The current transformer characteristic analysis method comprises: Obtaining a specified working state and a specified load state of the current transformer, and obtaining a specified current level of the extreme geomagnetic induction current to be simulated; wherein the working state includes: normal, near saturation, and saturation; and the load state includes: light load, rated, and overload; Determining a corresponding operating current setting interval according to the specified working state; and adjusting the operating current output by the adjustable current source according to the operating current setting interval; Determining a corresponding load setting interval according to the specified load state; and adjusting a load value of the adjustable load according to the load setting interval; determining a target charging voltage corresponding to the current level according to the specified current level and the resistance value of the resistor cabinet; controlling the capacitor bank to charge to the target charging voltage, and then controlling the capacitor bank to output an extreme magnetic induction simulated current to the current transformer; The data acquisition and analysis device is used to collect the primary side current data and the secondary side current data of the current transformer; and the excitation characteristics and the transmission characteristics of the current transformer are determined based on the primary side current data and the secondary side current data.

2. The current transformer characteristic analysis method according to claim 1, wherein: The determining, based on the primary-side current data and the secondary-side current data, the excitation characteristics and the transmission characteristics of the current transformer includes: Converting the primary side current data to the secondary side to obtain converted current data; Calculating a difference between the converted current data and the secondary side current data to obtain an excitation characteristic of the current transformer; Performing a Fourier transform on the converted current data to obtain a first fundamental wave amplitude and a first phase of the converted current data; performing a Fourier transform on the secondary side current data to obtain a second fundamental wave amplitude and a second phase of the secondary side current data; An amplitude error between the first fundamental wave amplitude and the second fundamental wave amplitude, and a phase error between the first phase and the second phase are calculated; and a transmission characteristic of the current transformer is obtained according to the amplitude error and the phase error.

3. The current transformer characteristic analysis method according to claim 1, wherein: The collecting of the primary side current data and the secondary side current data of the current transformer includes: collecting the extreme geomagnetic induction simulated current value output by the extreme geomagnetic induction current simulated injection source; When the extreme geomagnetic induction analog current value is greater than or equal to a preset current amplitude threshold, the primary side current data and the secondary side current data of the current transformer are collected.

4. The current transformer characteristic analysis method according to claim 1, wherein: The data acquisition and analysis device includes: a current clamp and a data analysis module; the current clamp is used to collect current data.

5. A current transformer characteristic analysis system, characterized in that: include: Adjustable current source, extreme geomagnetic induction current simulation injection source, current transformer to be analyzed, adjustable load, data acquisition and analysis device; The adjustable current source is connected to the primary side of the current transformer; the extreme geomagnetic induction current simulation injection source is connected to the primary side of the current transformer; the adjustable current source and the extreme geomagnetic induction current simulation injection source are connected in parallel; the adjustable load is connected to the secondary side of the current transformer; The adjustable current source is used to output an operating current whose effective value is adjustable; The extreme geomagnetic induction current simulation injection source includes: a resistor cabinet and a capacitor bank; the resistor cabinet and the capacitor bank are connected in series; the capacitor bank is used to store electricity and output the extreme geomagnetic induction simulation current to the current transformer; The adjustable load is used to provide an adjustable load for the current transformer; The data acquisition and analysis device is used to collect the primary side current data and the secondary side current data of the current transformer; and determine the excitation characteristics and the transmission characteristics of the current transformer based on the primary side current data and the secondary side current data.

6. The current transformer characteristic analysis system according to claim 5, characterized in that: The determining, based on the primary-side current data and the secondary-side current data, the excitation characteristics and the transmission characteristics of the current transformer includes: Converting the primary side current data to the secondary side to obtain converted current data; Calculating a difference between the converted current data and the secondary side current data to obtain an excitation characteristic of the current transformer; Performing a Fourier transform on the converted current data to obtain a first fundamental wave amplitude and a first phase of the converted current data; performing a Fourier transform on the secondary side current data to obtain a second fundamental wave amplitude and a second phase of the secondary side current data; An amplitude error between the first fundamental wave amplitude and the second fundamental wave amplitude, and a phase error between the first phase and the second phase are calculated; and a transmission characteristic of the current transformer is obtained according to the amplitude error and the phase error.

7. The current transformer characteristic analysis system according to claim 5, characterized in that: The collecting of the primary side current data and the secondary side current data of the current transformer includes: collecting the extreme geomagnetic induction simulated current value output by the extreme geomagnetic induction current simulated injection source; When the extreme geomagnetic induction analog current value is greater than or equal to a preset current amplitude threshold, the primary side current data and the secondary side current data of the current transformer are collected.

8. The current transformer characteristic analysis system according to claim 5, wherein: The data acquisition and analysis device includes: a current clamp and a data analysis module; the current clamp is used to collect current data.

9. A terminal device, characterized in that: The method comprises a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein when the processor executes the computer program, the current transformer characteristic analysis method according to any one of claims 1 to 4 is implemented.

10. A storage medium, characterized in that: The storage medium includes a stored computer program, wherein when the computer program is executed, the device where the storage medium is located is controlled to execute the current transformer characteristic analysis method according to any one of claims 1 to 4.

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