Error tracing device for high-voltage current transformer

Abstract

The invention relates to the technical field of measurement. The invention discloses a high-voltage current transformer error tracing device, which comprises a voltage booster, a high-voltage current booster and a standard current transformer, wherein the secondary winding K2 end of the standard current transformer is connected with the primary winding L1 end of the standard current transformer; a secondary winding K1 end of the standard current transformer and a primary winding L1 end of the standard current transformer are connected with the transformer verification module; a primary winding P1 end of the tested current transformer is connected in series with a primary winding L2 end of the standard current transformer, a primary winding P2 end of the tested current transformer is connected with the high-voltage current booster, and a secondary winding S2 end of the tested current transformer is grounded. The secondary winding S1 end of the tested current transformer and the secondary winding S2 end of the tested current transformer are connected with the transformer verification module. The voltage between the secondary winding and the primary winding of the standard current transformer is zero, the purpose of eliminating the leakage current of the standard current transformer is achieved, and the traceability accuracy of the current transformer is guaranteed.

Description

Technical Field

[0001] The invention relates to the field of measurement technology, and in particular to a high-voltage current transformer error tracing device. Background Art

[0002] Traditional current transformer error calibration is basically carried out under low voltage conditions, while current transformers operate under high voltage conditions. Its detection method cannot reflect the true error of the current transformer under actual operating conditions. In order to calibrate the error of the current transformer under actual operating conditions, the national calibration regulations JJG 1165-2019 "Three-phase combination transformer" stipulate that the rated working voltage needs to be applied for current transformer calibration, that is, during calibration, the standard current transformer and the current transformer under test need to operate at the rated voltage to simulate the actual operating conditions.

[0003] The structure of the current transformer determines that there is a certain amount of parasitic capacitance and leakage reactance between the primary and secondary windings. The applied high voltage generates leakage current between the primary and secondary sides of the current transformer. There are two difficulties in suppressing the leakage current: First, the leakage current is usually in the microampere level, has nonlinear characteristics, and is easily interfered by the on-site electromagnetic field and noise, making it difficult to accurately measure and suppress; second, according to the verification procedures, the measurement error introduced by the leakage current should not be greater than 1 / 10 of the limit. Taking the 0.01S-level standard current transformer as an example, its leakage current should be less than 1μA. It is difficult to detect and suppress weak leakage current with existing technology, and with the increase of voltage and accuracy level, the cost and difficulty of suppression increase sharply, and the suppression of leakage current encounters a technical bottleneck. Due to the technical difficulties in suppressing leakage current of current transformers, the traceability of high-voltage current transformers is still calibrated at low voltage in accordance with JJG313-2010 "Current Transformers for Measurement", which cannot guarantee the accuracy of current transformers under high voltage, which is contrary to the requirements of JJG 1165-2019 "Three-Phase Combination Transformers". In order to solve the traceability problem of current transformers under high voltage, it is of great significance to study the error tracing method of high-voltage current transformers to change the above situation. Summary of the invention

[0004] In view of this, the present invention provides a high-voltage current transformer error tracing device.

[0005] Specifically, the following technical solutions are included:

[0006] The present application provides a high-voltage current transformer error tracing device, comprising:

[0007] Booster, high voltage current booster, standard current transformer TA0, tested current transformer TA x , transformer calibration module;

[0008] The booster, the high-voltage current booster, and the secondary winding K2 end of the standard current transformer TA0 are all connected to the primary winding L1 end of the standard current transformer TA0;

[0009] The secondary winding K1 end of the standard current transformer TA0 and the primary winding L1 end of the standard current transformer TA0 are connected to the transformer verification module;

[0010] The tested current transformer TA x The primary winding P1 end of the standard current transformer TA0 is connected in series with the primary winding L2 end of the standard current transformer TA0. x The primary winding P2 end is connected to the high voltage current booster, and the tested current transformer TA x The secondary winding S2 is grounded, and the current transformer TA under test x The secondary winding S1 end of the tested current transformer TA x The secondary winding S2 end is connected to the transformer verification module.

[0011] Preferably, the transformer verification module includes a high voltage submodule and a low voltage submodule;

[0012] The high-voltage submodule is connected to the secondary winding K1 end of the standard current transformer TA0, the secondary winding K2 end of the standard current transformer TA0, and the primary winding L1 end of the standard current transformer TA0;

[0013] The low voltage submodule and the tested current transformer TA x The secondary winding S1 end of the tested current transformer TA x The secondary winding S2 end is connected;

[0014] The high voltage submodule and the low voltage submodule are connected via optical fiber communication.

[0015] Preferably, the high-voltage submodule includes an analog-to-digital converter A / D1, a microprocessor CPU1, a communication module EOC1, and a DC power supply;

[0016] The DC power supply is at a high voltage potential, and the DC power supply is respectively connected to the analog-to-digital converter A / D1, the microprocessor CPU1, the communication module EOC1 and the primary winding L1 end of the standard current transformer TA0;

[0017] The analog-to-digital converter A / D1 is connected to the secondary winding K2 end of the standard current transformer TA0 and the primary winding L1 end of the standard current transformer TA0;

[0018] The analog-to-digital converter A / D1 is communicatively connected with the microprocessor CPU1;

[0019] The communication module EOC1 and the low voltage submodule are connected via optical fiber communication.

[0020] Preferably, the DC power supply V + The terminals are respectively connected to the analog-to-digital converter A / D1, the microprocessor CPU1, and the V CC end;

[0021] The GND end of the DC power supply is connected to the GND end of the analog-to-digital converter A / D1, the microprocessor CPU1, the communication module EOC1 and the primary winding L1 end of the standard current transformer TA0;

[0022] The V IN The end is connected to the secondary winding K1 end of the standard current transformer TA0, and the COM end of the analog-to-digital converter A / D1 is connected to the secondary winding K2 end of the standard current transformer TA0.

[0023] Preferably, the high voltage submodule includes a first synchronous clock module;

[0024] The DC power supply V + The first synchronous clock module is connected to the V CC end;

[0025] The GND terminal of the DC power supply is connected to the GND terminal of the first synchronous clock module;

[0026] The first synchronous clock module is in communication connection with the microprocessor CPU1.

[0027] Preferably, the low voltage submodule includes an analog-to-digital converter A / D2, a microprocessor CPU2, a communication module EOC2, a display module and a power supply;

[0028] The analog-to-digital converter A / D2 and the tested current transformer TA x The secondary winding S1 end of the tested current transformer TA x The secondary winding S2 end is connected;

[0029] The microprocessor CPU2 is respectively connected to the analog-to-digital converter A / D2, the communication module EOC2, and the display module for communication;

[0030] The communication module EOC2 is communicatively connected with the high voltage submodule;

[0031] The V+ end of the power supply is respectively connected to the VCC ends of the analog-to-digital converter A / D2, the microprocessor CPU2, and the communication module EOC2, and the GND end of the power supply is connected to the GND ends of the analog-to-digital converter A / D2, the microprocessor CPU2, and the communication module EOC2.

[0032] Preferably, the low voltage submodule further includes a second synchronous clock module;

[0033] The V+ terminal of the power supply is connected to the VCC terminal of the second synchronous clock module, and the GND terminal of the power supply is connected to the GND terminal of the second synchronous clock module;

[0034] The second synchronous clock module is in communication connection with the microprocessor CPU2.

[0035] Preferably, the high-voltage submodule includes a communication module EOC1, and the low-voltage submodule includes a communication module EOC2, and the communication module EOC1 and the communication module EOC2 are connected via an optical fiber.

[0036] Preferably, a first resistor is provided between the secondary winding K1 end of the standard current transformer TA0 and the secondary winding K2 end of the standard current transformer TA0;

[0037] The tested current transformer TA x The secondary winding S1 end and the tested current transformer TA x A second resistor is provided between ends of the secondary winding S2.

[0038] The beneficial effects of the technical solution provided by the present invention include at least:

[0039] The present application connects the secondary winding K2 end of the standard current transformer TA0 with the primary winding L1 end of the standard current transformer TA0 so that the secondary winding and the primary winding of the standard current transformer TA0 are at the same potential, that is, the voltage between the secondary winding and the primary winding of the standard current transformer TA0 is zero, thereby achieving the purpose of eliminating the leakage current of the standard current transformer, so that the traceability of the high-voltage current transformer can be tested under high voltage, thereby ensuring the accuracy of the current transformer traceability. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0041] Figure 1This is the principle diagram of leakage current generated by the current transformer under high voltage state in the traditional tracing method;

[0042] Figure 2 This is a schematic diagram of the error tracing principle of a high-voltage current transformer according to an embodiment of the present invention.

[0043] The above drawings have shown clear embodiments of the present invention, which will be described in more detail below. These drawings and text descriptions are not intended to limit the scope of the present invention in any way, but to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0044] 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 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.

[0045] Before further describing the embodiments of the present invention in detail, the directional nouns involved in the embodiments of the present invention, such as "upper part", "lower part", "side part", etc., are Figure 1 The directions shown in the figure are for reference only and do not limit the protection scope of the present invention.

[0046] To make the technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0047] The current current transformer tracing circuit is as follows: Figure 1 As shown in the figure, when the standard current transformer TA0 and the tested current transformer TA x When working at rated voltage to simulate actual operating conditions, an operating voltage U is applied between the primary winding and the secondary winding. e When the leakage current I X The leakage current is superimposed on the secondary current I2 of the current transformer, which causes additional errors in the measurement of high-voltage current, resulting in inaccurate high-voltage current measurement and affecting the accuracy of current transformer traceability. A key problem solved by the present invention is to eliminate the leakage current I2 of the standard current transformer TA0 under high-voltage conditions. X . Figure 1 Where I1 is the primary current of the current transformer and Z is the current load box.

[0048] The present application provides a high voltage current transformer error tracing device, the principle schematic diagram of which is shown in FIG. Figure 2 As shown, it includes a booster, a high-voltage current booster, a standard current transformer TA0, and a tested current transformer TA x, transformer verification module. The secondary winding K2 end of the booster, high-voltage current booster, and standard current transformer TA0 are all connected to the primary winding L1 end of the standard current transformer TA0; the secondary winding K1 end of the standard current transformer TA0 and the primary winding L1 end of the standard current transformer TA0 are connected to the transformer verification module; the tested current transformer TA x The primary winding P1 end of the standard current transformer TA0 is connected in series with the primary winding L2 end of the standard current transformer TA0. x The primary winding P2 end of the tested current transformer TA is connected to the high voltage current booster. x The secondary winding S2 of the tested current transformer TA is grounded. x The secondary winding S1 end and the current transformer TA under test x The secondary winding S2 end is connected to the transformer calibration module.

[0049] The present application connects the secondary winding K2 end of the standard current transformer TA0 with the primary winding L1 end of the standard current transformer TA0 so that the secondary winding and the primary winding of the standard current transformer TA0 are at the same potential, that is, the voltage between the secondary winding and the primary winding of the standard current transformer TA0 is zero, thereby achieving the purpose of eliminating the leakage current of the standard current transformer, so that the traceability of the high-voltage current transformer can be tested under high voltage, thereby ensuring the accuracy of the current transformer traceability.

[0050] The circuit connected to the standard current transformer TA0 in the transformer calibration module is in a high voltage state and is connected to the current transformer under test TA x The connected circuit is at low voltage.

[0051] Preferably, the transformer calibration module includes a high-voltage submodule and a low-voltage submodule; the high-voltage submodule is connected to the secondary winding K1 end of the standard current transformer TA0, the secondary winding K2 end of the standard current transformer TA0, and the primary winding L1 end of the standard current transformer TA0; the low-voltage submodule is connected to the tested current transformer TA x The secondary winding S1 end and the current transformer TA under test x The secondary winding S2 end of the high-voltage submodule is connected; the high-voltage submodule and the low-voltage submodule are connected through optical fiber communication. The potential in the high-voltage submodule is high, and the potential in the low-voltage submodule is low, which realizes the standard current transformer TA0 and the tested current transformer TA x Work at rated voltage to simulate actual operating conditions.

[0052] Preferably, the high-voltage sub-module includes an analog-to-digital converter A / D1, a microprocessor CPU1, a communication module EOC1, and a DC power supply; the DC power supply is at a high-voltage potential, and the DC power supply is respectively connected to the analog-to-digital converter A / D1, the microprocessor CPU1, the communication module EOC1, and the primary winding L1 end of the standard current transformer TA0; the analog-to-digital converter A / D1 is connected to the secondary winding K2 end of the standard current transformer TA0 and the primary winding L1 end of the standard current transformer TA0; the analog-to-digital converter A / D1 is communicatively connected to the microprocessor CPU1; the communication module EOC1 and the low-voltage sub-module are connected via optical fiber communication. Specifically, the analog-to-digital converter A / D1 and the microprocessor CPU1 are connected via a data bus (DATA BUS), the microprocessor CPU1 and the communication module EOC1 are connected via a data line, the analog-to-digital converter A / D1 implements the secondary current sampling of the standard current transformer TA0, and the obtained secondary current sampling data of the standard current transformer TA0 is transmitted to the microprocessor CPU1 via the data bus (DATA BUS), and then transmitted to the communication module EOC1 via the data line, and finally transmitted to the low-voltage sub-module via the optical fiber, and the test current transformer TA0 obtained in the low-voltage sub-module is connected to the test current transformer TA0. x The data communication problem between the high voltage submodule and the low voltage submodule is solved by optical fiber physical isolation.

[0053] The high voltage potential is designed as the reference potential of the high voltage submodule measurement circuit. The DC power supply is in a high voltage state to solve the isolation problem between the high voltage and zero potential power supply. Since the energy extraction scheme of the high voltage potential power supply is not within the scope of this application, it is not described here.

[0054] Preferably, the DC power supply V + The terminals are connected to the analog-to-digital converter A / D1, the microprocessor CPU1, and the communication module EOC1. CC The GND end of the DC power supply is connected to the GND end of the analog-to-digital converter A / D1, the microprocessor CPU1, the communication module EOC1 and the primary winding L1 end of the standard current transformer TA0; the V IN The terminal is connected to the secondary winding K1 terminal of the standard current transformer TA0, and the COM terminal of the analog-to-digital converter A / D1 is connected to the secondary winding K2 terminal of the standard current transformer TA0.

[0055] Preferably, the high voltage submodule includes a first synchronous clock module; a DC power supply V + The first synchronous clock module's V CCThe GND end of the DC power supply is connected to the GND end of the first synchronous clock module; the first synchronous clock module is connected to the microprocessor CPU1. The first synchronous clock module uses Beidou satellite timing, and sends a sampling signal and sampling time to the analog-to-digital converter A / D1 through the microprocessor CPU1 to realize the sampling of the current sampling circuit of the high-voltage submodule.

[0056] Preferably, the low voltage submodule includes an analog-to-digital converter A / D2, a microprocessor CPU2, a communication module EOC2, a display module and a power supply; the analog-to-digital converter A / D2 and the tested current transformer TA x The secondary winding S1 end and the current transformer TA under test x The secondary winding S2 of the microprocessor CPU2 is connected to the analog-to-digital converter A / D2, the communication module EOC2, and the display module respectively; the communication module EOC2 is connected to the high-voltage submodule; the power supply V + The power supply is 220V, ensuring that the transformer TA under test is x testing needs.

[0057] Furthermore, in this embodiment, the power supply in the low-voltage submodule is connected to 220V AC power, outputs a DC voltage through an internal rectifier circuit, and the GND terminal of the power supply is grounded.

[0058] Furthermore, in this embodiment, the DC power supply in the high voltage submodule is a battery, and the GND terminal of the DC power supply is connected to the output terminal of the booster, that is, the reference voltage of the DC power supply is the output voltage of the booster, and the V + The output voltage at the end is the superposition of the output voltage of the booster and the voltage of the DC power supply itself.

[0059] like Figure 2 As shown, the low-voltage submodule also includes a second synchronous clock module; the V+ end of the power supply is connected to the VCC end of the second synchronous clock module, and the GND end of the power supply is connected to the GND end of the second synchronous clock module; the second synchronous clock module is connected to the microprocessor CPU2 for communication. The second synchronous clock module uses Beidou satellite timing, and sends a sampling signal and sampling time to the analog-to-digital converter A / D2 through the microprocessor CPU2 to achieve sampling of the current sampling circuit of the low-voltage submodule.

[0060] Furthermore, both the first synchronous clock module and the second synchronous clock module adopt Beidou satellite timing, thereby realizing synchronous sampling of the first synchronous clock module and the second synchronous clock module.

[0061] Preferably, the high voltage submodule includes a communication module EOC1, and the low voltage submodule includes a communication module EOC2, and the communication module EOC1 and the communication module EOC2 are connected via an optical fiber. The first synchronous clock module and the second synchronous clock module simultaneously receive Beidou satellite timing, send a synchronous sampling signal and sampling time to the analog-to-digital converter A / D1 and the analog-to-digital converter A / D2 to achieve synchronous sampling, and mark the time of the sampled current data. The sampling data of the analog-to-digital converter A / D1 is transmitted to the microprocessor CPU2 in a zero potential state via the microprocessor CPU2, the communication module EOC1, the optical fiber, and the communication module EOC2. The setting of the optical fiber solves the isolation problem of high voltage and zero potential data transmission.

[0062] Specifically, the secondary current sampling data of the standard current transformer TA0 obtained by sampling of the analog-to-digital converter A / D1 is transmitted to the microprocessor CPU2 through the optical fiber, and the microprocessor CPU2 compares the secondary current sampling data of the standard current transformer TA0 obtained by synchronous sampling with the secondary current sampling data of the current transformer TA0 under test. x The secondary current sampling data is used to calculate the TA of the current transformer under test based on the discrete Fourier transform (DFT). x Specifically, the time-stamped analog-to-digital converter A / D1 sampling current data is transmitted to the microprocessor CPU2 through the optical fiber. The microprocessor CPU2 directly compares the analog-to-digital converter A / D1 and the analog-to-digital converter A / D2 sampling current data at the same time, calculates the ratio difference and phase difference using discrete Fourier transform (DFT), and displays them on the display module.

[0063] Preferably, a first resistor R1 is arranged between the secondary winding K1 end of the standard current transformer TA0 and the secondary winding K2 end of the standard current transformer TA0, and the first resistor R1 connects the secondary winding K1 end of the standard current transformer TA0 and the secondary winding K2 end of the standard current transformer TA0, and is connected in parallel with the secondary winding of the standard current transformer TA0.

[0064] Preferably, the current transformer under test TA x The secondary winding S1 end and the current transformer TA under test x A second resistor R2 is provided between the secondary winding S2 end of the tested current transformer TAx and the secondary winding S1 end of the tested current transformer TAx, and the second resistor R2 is connected to the secondary winding S2 end of the tested current transformer TAx. x The secondary windings are connected in parallel.

[0065] The communication module EOC1 and the communication module EOC2 are photoelectric conversion communication modules.

[0066] This application starts from the principle of high-voltage leakage current generation, and adopts the equipotential method of the primary winding and the secondary winding of the standard current transformer TA0, so that the potential difference between the primary winding of the standard current transformer TA0 and the secondary winding is zero, so as to achieve the purpose of eliminating leakage current. In the above setting, the standard current transformer TA0 does not need to make any leakage current suppression improvements. The error tracing of the current transformer under high voltage can be achieved by using the traditional standard current transformer TA0 to make the primary winding and the secondary winding equipotential, which effectively saves the shielding and insulation modification costs of the standard current transformer TA0. This device has strong adaptability and is not affected by the increase in the rated voltage and accuracy level of the standard current transformer TA0. It can be used for tracing the value of current transformers of 0.05S level and above under high voltage, and has the advantages of simple method, economy, science, practicality, strong operability and low cost.

[0067] As a specific embodiment, it specifically includes:

[0068] Step 1: Connect the secondary winding K2 end of the standard current transformer TA0 to the primary winding L1 end, so that the primary winding and the secondary winding of the standard current transformer TA0 are equipotential, and the potential difference between the primary winding of the standard current transformer and the secondary winding is zero, so as to eliminate the leakage current. The analog-to-digital converter A / D1 realizes the secondary current sampling of the standard current transformer at a high potential;

[0069] Step 2: Test current transformer TA x Primary winding P1 and standard current transformer TA x The primary winding L2 is connected in series, and the current transformer under test is TA x The secondary winding S2 is grounded, and the analog-to-digital converter A / D2 realizes the current transformer TA under test at zero potential. x Secondary current sampling;

[0070] Step 3: The DC power supply is at high voltage potential, its GND terminal is connected to the primary winding L1 end of the current transformer, and its V + The V of the analog-to-digital converter A / D1, microprocessor CPU1, communication module EOC1 and the first synchronous clock module is terminated. CC end;

[0071] The input voltage of the power supply is 220V AC, and the output voltage is V + The ends are respectively connected to the VCC ends of the analog-to-digital converter A / D2, the microprocessor CPU2, the communication module EOC2, and the second synchronous clock module, and the GND ends are connected to the GND ends of the analog-to-digital converter A / D2, the microprocessor CPU2, the communication module EOC2, and the second synchronous clock module;

[0072] Step 4: One end of the optical fiber is connected to the communication module EOC1, and the other end is connected to the communication module EOC2, and the problem of high voltage and zero potential data communication is solved through optical fiber physical isolation;

[0073] Step 5: The first synchronous clock module and the second synchronous clock module use Beidou satellite timing to send synchronous sampling signals and sampling times to the analog-to-digital converter A / D1 and the analog-to-digital converter A / D2, thereby realizing synchronous sampling of the two current sampling loops of the high-voltage submodule and the low-voltage submodule.

[0074] Step 6: The current data sampled by the analog-to-digital converter A / D1 is transmitted to the microprocessor CPU2 through the optical fiber. The microprocessor CPU2 compares the secondary current sampling data of the standard current transformer TA0 obtained by synchronous sampling with the current transformer TA0 under test. x The secondary current sampling data is used to calculate the TA of the current transformer under test based on the discrete Fourier transform (DFT). x The error is detected and the ratio difference and phase difference are displayed on the display module.

[0075] In the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The term "plurality" refers to two or more than two, unless otherwise clearly defined.

[0076] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. The present invention is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The description and examples are to be considered exemplary only.

[0077] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high voltage current transformer error tracing device, characterized in that: include: Booster, high voltage current booster, standard current transformer TA0, tested current transformer TA x , transformer calibration module; The booster, the high-voltage current booster, and the secondary winding K2 end of the standard current transformer TA0 are all connected to the primary winding L1 end of the standard current transformer TA0; The secondary winding K1 end of the standard current transformer TA0 and the primary winding L1 end of the standard current transformer TA0 are connected to the transformer verification module; The tested current transformer TA x The primary winding P1 end of the standard current transformer TA0 is connected in series with the primary winding L2 end of the standard current transformer TA0. x The primary winding P2 end is connected to the high voltage current booster, and the tested current transformer TA x The secondary winding S2 is grounded, and the current transformer TA under test x The secondary winding S1 end of the tested current transformer TA x The secondary winding S2 end is connected to the transformer verification module.

2. A high voltage current transformer error tracing device according to claim 1, characterized in that: The mutual inductor verification module includes a high voltage submodule and a low voltage submodule; The high-voltage submodule is connected to the secondary winding K1 end of the standard current transformer TA0, the secondary winding K2 end of the standard current transformer TA0, and the primary winding L1 end of the standard current transformer TA0; The low voltage submodule and the tested current transformer TA x The secondary winding S1 end of the tested current transformer TA x The secondary winding S2 end is connected; The high voltage submodule and the low voltage submodule are connected via optical fiber communication.

3. A high voltage current transformer error tracing device according to claim 2, characterized in that: The high-voltage submodule includes an analog-to-digital converter A / D1, a microprocessor CPU1, a communication module EOC1, and a DC power supply; The DC power supply is at a high voltage potential, and the DC power supply is respectively connected to the analog-to-digital converter A / D1, the microprocessor CPU1, the communication module EOC1 and the primary winding L1 end of the standard current transformer TA0; The analog-to-digital converter A / D1 is connected to the secondary winding K2 end of the standard current transformer TA0 and the primary winding L1 end of the standard current transformer TA0; The analog-to-digital converter A / D1 is communicatively connected with the microprocessor CPU1; The communication module EOC1 and the low voltage submodule are connected via optical fiber communication.

4. A high voltage current transformer error tracing device according to claim 3, characterized in that: The DC power supply V + The terminals are respectively connected to the analog-to-digital converter A / D1, the microprocessor CPU1, and the V CC end; The GND end of the DC power supply is connected to the GND end of the analog-to-digital converter A / D1, the microprocessor CPU1, the communication module EOC1 and the primary winding L1 end of the standard current transformer TA0; The analog-to-digital converter A / D1 has a V IN The end is connected to the secondary winding K1 end of the standard current transformer TA0, and the COM end of the analog-to-digital converter A / D1 is connected to the secondary winding K2 end of the standard current transformer TA0.

5. A high voltage current transformer error tracing device according to claim 3, characterized in that: The high voltage submodule includes a first synchronous clock module; The DC power supply V + The first synchronous clock module is connected to the V CC end; The GND terminal of the DC power supply is connected to the GND terminal of the first synchronous clock module; The first synchronous clock module is in communication connection with the microprocessor CPU1.

6. A high voltage current transformer error tracing device according to claim 2, characterized in that: The low voltage submodule includes an analog-to-digital converter A / D2, a microprocessor CPU2, a communication module EOC2, a display module and a power supply; The analog-to-digital converter A / D2 and the tested current transformer TA x The secondary winding S1 end of the tested current transformer TA x The secondary winding S2 end is connected; The microprocessor CPU2 is respectively connected to the analog-to-digital converter A / D2, the communication module EOC2, and the display module for communication; The communication module EOC2 is communicatively connected with the high voltage submodule; The V+ end of the power supply is respectively connected to the VCC ends of the analog-to-digital converter A / D2, the microprocessor CPU2, and the communication module EOC2, and the GND end of the power supply is connected to the GND ends of the analog-to-digital converter A / D2, the microprocessor CPU2, and the communication module EOC2.

7. A high voltage current transformer error tracing device according to claim 6, characterized in that: The low voltage submodule also includes a second synchronous clock module; The V+ terminal of the power supply is connected to the VCC terminal of the second synchronous clock module, and the GND terminal of the power supply is connected to the GND terminal of the second synchronous clock module; The second synchronous clock module is in communication connection with the microprocessor CPU2.

8. A high voltage current transformer error tracing device according to claim 2, characterized in that: The high voltage submodule includes a first synchronous clock module, and the low voltage submodule also includes a second synchronous clock module; The first synchronous clock module and the second synchronous clock module use Beidou satellite timing.

9. A high voltage current transformer error tracing device according to claim 2, characterized in that: The high-voltage submodule includes a communication module EOC1, and the low-voltage submodule includes a communication module EOC2. The communication module EOC1 and the communication module EOC2 are connected via an optical fiber.

10. The high voltage current transformer error tracing device according to claim 1, characterized in that: A first resistor is provided between the secondary winding K1 end of the standard current transformer TA0 and the secondary winding K2 end of the standard current transformer TA0; The tested current transformer TA x The secondary winding S1 end and the tested current transformer TA x A second resistor is provided between ends of the secondary winding S2.

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