Automatic compensation adjustment method and device for current transformer

Abstract

The invention discloses an automatic compensation adjustment method and device for a current transformer, and relates to the technical field of mutual inductors, and the method comprises the steps: obtaining the temperature data of the current transformer based on a temperature sensor, and extracting the variation amplitude of the working temperature of the current transformer; setting a test light wave, and calculating a theoretical current value and a theoretical voltage value of the test light wave according to the variation amplitude; outputting a test current value and a test voltage value of the test light wave, calculating a current correction coefficient based on the test current value and the theoretical current value, and calculating a voltage correction coefficient based on the test voltage value and the theoretical voltage value; calculating a light wave compensation value of the current transformer according to the current correction coefficient, the voltage correction coefficient, the test current value and the test voltage value; and performing transmission compensation on the transmission light wave of the current transformer based on the light wave compensation value. The optical wave compensation value is calculated by analyzing the phase angle change of the temperature to the transmission optical fiber, so that the current transformer can carry out adaptive compensation on each measurement, and the accuracy of current measurement is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of mutual inductors, and in particular to an automatic compensation adjustment method and device for a current mutual inductor. Background Art

[0002] At present, current transformers are mainly divided into electromagnetic current transformers and electronic current transformers. Due to the complex connection structure of the existing power grid system, the setting structure of the electromagnetic current transformer is complex and the installation is difficult. The installation structure of the electronic current transformer is simple and can adapt to the installation environment of a variety of power grid systems.

[0003] Electronic current transformers mainly transmit light waves from the high voltage end to the low voltage end through the conversion of photoelectric signals, and output the measured current value through photoelectric conversion. Since the transmission optical fiber of the electronic current transformer is highly sensitive to the working temperature, that is, the electronic current transformer is easily affected by temperature and has large detection errors, therefore, how to reduce the detection error of the electronic current transformer is one of the main research directions of current transformers. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art. The present invention provides a method and device for automatic compensation adjustment of a current transformer. By analyzing the phase angle change of the transmission optical fiber caused by temperature and calculating the light wave compensation value, the current transformer can perform adaptive compensation for each measurement, thereby improving the accuracy of current measurement.

[0005] The present invention provides an automatic compensation adjustment method for a current transformer, the adjustment method comprising:

[0006] Acquiring temperature data of the current transformer based on a temperature sensor, and extracting a variation range of the operating temperature of the current transformer from the temperature data;

[0007] Setting a test light wave, and calculating a theoretical current value and a theoretical voltage value of the test light wave according to the variation amplitude;

[0008] Based on the test current value and the test voltage value of the test light wave output by the current transformer, a current correction factor is calculated based on the test current value and the theoretical current value, and a voltage correction factor is calculated based on the test voltage value and the theoretical voltage value;

[0009] Calculate the light wave compensation value of the current transformer according to the current correction coefficient, the voltage correction coefficient, the test current value and the test voltage value;

[0010] The transmission light wave of the current transformer is transmitted with compensation based on the light wave compensation value.

[0011] Furthermore, the step of acquiring the temperature data of the current transformer based on the temperature sensor and extracting the variation range of the operating temperature of the current transformer from the temperature data includes:

[0012] Acquiring the ambient temperature of the current transformer by means of a first temperature sensor arranged in the working environment of the current transformer;

[0013] Acquiring the operating temperature of the current transformer by means of a second temperature sensor configured in the sensing module of the current transformer;

[0014] The temperature conversion efficiency between the ambient temperature and the operating temperature is calculated according to the temperature detection timing, and the temperature change rate of the operating temperature is calculated based on the temperature detection timing.

[0015] Furthermore, the step of acquiring the temperature data of the current transformer based on the temperature sensor and extracting the variation range of the operating temperature of the current transformer from the temperature data further includes:

[0016] The change amplitude of the operating temperature is calculated based on the temperature conversion efficiency between the ambient temperature and the operating temperature combined with the temperature change rate of the operating temperature.

[0017] Further, the setting of the test light wave and calculating the theoretical current value and the theoretical voltage value of the test light wave according to the variation amplitude include:

[0018] The test light wave is emitted to the sensor module of the current transformer through the light emitting component, and the test light wave transmission of the current transformer is simulated according to the change amplitude of the working temperature of the current transformer;

[0019] The theoretical current value and the theoretical voltage value obtained by the current transformer based on the test light wave transmission are obtained.

[0020] Furthermore, the setting of the test light wave and calculating the theoretical current value and the theoretical voltage value of the test light wave according to the variation amplitude further includes:

[0021] Query the physical characteristics of the transmission optical fiber according to the model of the transmission optical fiber of the current transformer;

[0022] Calculating the transmission phase difference of the transmission optical fiber based on the physical characteristics of the transmission optical fiber and the operating temperature variation of the current transformer;

[0023] The theoretical current value and the theoretical voltage value of the test light wave after being transmitted through the transmission optical fiber are calculated according to the transmission phase difference of the transmission optical fiber.

[0024] Further, the calculation of the transmission phase difference of the transmission optical fiber based on the physical characteristics of the transmission optical fiber and the operating temperature variation amplitude of the current transformer includes:

[0025] The transmission phase difference calculation formula of the transmission optical fiber is: ;

[0026] in, is the transmission phase difference of the transmission fiber, is the wavelength of the light wave transmitted in the optical fiber. For a transmission cycle, is the refractive index of the transmission fiber, is the length of the transmission fiber, is the change in the refractive index of the transmission fiber when it undergoes thermal expansion, is the change in refractive index of the optical fiber under stress, It is the deformation of the transmission optical fiber during thermal expansion. It is the deformation of the transmission optical fiber under stress.

[0027] Further, the test current value based on the test light wave output by the current transformer and the calculation of the current correction coefficient based on the test current value and the theoretical current value include:

[0028] The calculation formula of the current correction coefficient is: ;

[0029] in, is the current correction factor, is the test current value, is the theoretical current value.

[0030] Further, the test voltage value of the test light wave output by the current transformer and the calculation of the voltage correction coefficient based on the test voltage value and the theoretical voltage value include:

[0031] The calculation formula of the current correction coefficient is: ;

[0032] in, is the voltage correction factor, is the test voltage value, is the theoretical voltage value.

[0033] Further, the calculation of the light wave compensation value of the current transformer according to the current correction coefficient, the voltage correction coefficient, the test current value and the test voltage value includes:

[0034] Calculate a first phase angle difference of a transmission optical fiber of a current transformer based on the test current value and the current correction coefficient;

[0035] Calculate a second phase angle difference of the transmission optical fiber of the current transformer based on the test voltage value and the voltage correction coefficient;

[0036] The first phase angle difference and the second phase angle difference are averaged to obtain a phase angle change value, and generate a light wave compensation value.

[0037] The present invention provides an automatic compensation adjustment device for a current transformer, the adjustment device comprising:

[0038] Temperature detection component: used to obtain the temperature data of the current transformer based on the temperature sensor, and extract the change amplitude of the working temperature of the current transformer from the temperature data;

[0039] Test calculation component: used for setting the test light wave, and calculating the theoretical current value and the theoretical voltage value of the test light wave according to the variation amplitude;

[0040] Correction calculation component: used for calculating the current correction factor based on the test current value and the theoretical current value based on the test current value and the test voltage value of the test light wave output by the current transformer, and calculating the voltage correction factor based on the test voltage value and the theoretical voltage value;

[0041] Compensation calculation component: used to calculate the light wave compensation value of the current transformer according to the current correction coefficient, the voltage correction coefficient, the test current value and the test voltage value;

[0042] Transmission compensation component: used to perform transmission compensation on the transmission light wave of the current transformer based on the light wave compensation value.

[0043] The present invention provides an automatic compensation adjustment method and device for a current transformer. The method obtains the operating temperature and ambient temperature of the current transformer, analyzes the change in the phase angle of the transmission optical fiber caused by the temperature in conjunction with the material of the transmission optical fiber of the current transformer, performs a simulation test based on a test light wave, and calculates the light wave compensation value, so that the current transformer can perform adaptive compensation for each measurement, thereby improving the accuracy of current measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 is a flow chart of an automatic compensation adjustment method for a current transformer in an embodiment of the present invention;

[0045] Figure 2 is a structural schematic diagram of a current transformer in an embodiment of the present invention;

[0046] Figure 3 is a flow chart of working temperature analysis in an embodiment of the present invention;

[0047] Figure 4 It is a schematic diagram of an automatic compensation adjustment device for a current transformer in an embodiment of the present invention. DETAILED DESCRIPTION

[0048] 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.

[0049] Embodiment 1:

[0050] Figure 1 The flowchart of the automatic compensation adjustment method of the current transformer in the embodiment of the present invention is shown. The automatic compensation adjustment method of the current transformer includes:

[0051] S11: Acquire temperature data of the current transformer based on the temperature sensor, and extract the variation amplitude of the operating temperature of the current transformer from the temperature data.

[0052] The temperature data of the current transformer is obtained based on a temperature sensor, and the variation amplitude of the working temperature of the current transformer is extracted from the temperature data, including: obtaining the ambient temperature of the current transformer by a first temperature sensor configured in the working environment of the current transformer; obtaining the working temperature of the current transformer by a second temperature sensor configured in a sensing module of the current transformer; calculating the temperature conversion efficiency between the ambient temperature and the working temperature according to the temperature detection timing, and calculating the temperature change rate of the working temperature based on the temperature detection timing.

[0053] The first temperature sensor may be configured at a certain distance from the current transformer. In this embodiment, the configuration distance of the first temperature sensor is within 1 meter to ensure that the acquired ambient temperature can reflect the temperature environment around the current transformer.

[0054] The second temperature sensor can be directly attached to the sensor module of the current transformer to obtain a more accurate working temperature. The temperature detection time interval of the first temperature sensor and the second temperature sensor is configured to be 20s, and the detection time frequency of the first temperature sensor and the second temperature sensor is consistent, thereby satisfying the calculation of the temperature conversion rate between the ambient temperature and the working temperature.

[0055] By using two temperature sensors to obtain the ambient temperature and the operating temperature respectively, and then using the temperature detection sequence to calculate the temperature conversion efficiency and the temperature change rate, the change range of the current transformer operating temperature can be accurately obtained. By analyzing the impact of the ambient temperature on the operating temperature and the change of the operating temperature over time, the temperature change of the current transformer can be more comprehensively and accurately reflected. By accurately obtaining the change range of the current transformer operating temperature, a reliable data basis can be provided for subsequent compensation adjustments, thereby improving the measurement accuracy of the current transformer, being able to better cope with complex working environments, and improving the stability and reliability of the current transformer under different temperature conditions.

[0056] S12: Setting a test light wave, and calculating a theoretical current value and a theoretical voltage value of the test light wave according to the variation amplitude.

[0057] According to the obtained operating temperature variation of the current transformer, the transmission process of the test light wave in the current transformer is simulated, that is, according to the transmission characteristic variation of the transmission optical fiber, the theoretical current value and theoretical voltage value output by the test light wave after passing through the transmission optical fiber are calculated.

[0058] Finally, by simulating the test results of light wave transmission, the theoretical current value and theoretical voltage value are obtained, which provides reliable basic data for subsequent compensation adjustment. The calculation of the theoretical value can be based on the principle of photoelectric conversion, taking into account the influence of temperature on photoelectric conversion efficiency.

[0059] Based on the dynamic influence of temperature change on the performance of current transformer, the fixed compensation parameters are avoided, so that the reliability of compensation adjustment is improved. By simulating the transmission process of the test light wave, the actual working condition can be reflected more accurately.

[0060] S13: Based on the test current value and the test voltage value of the test light wave output by the current transformer, a current correction coefficient is calculated based on the test current value and the theoretical current value, and a voltage correction coefficient is calculated based on the test voltage value and the theoretical voltage value.

[0061] The calculation formula of the current correction coefficient is: ;

[0062] in, is the current correction factor, is the test current value, is the theoretical current value.

[0063] The calculation formula of the current correction coefficient is: ;

[0064] in, is the voltage correction factor, is the test voltage value, is the theoretical voltage value.

[0065] S14: Calculate the light wave compensation value of the current transformer according to the current correction coefficient, the voltage correction coefficient, the test current value and the test voltage value.

[0066] The optical wave compensation value of the current transformer is calculated according to the current correction coefficient, the voltage correction coefficient, the test current value and the test voltage value, including: calculating the first phase angle difference of the transmission optical fiber of the current transformer based on the test current value and the current correction coefficient; calculating the second phase angle difference of the transmission optical fiber of the current transformer based on the test voltage value and the voltage correction coefficient; performing mean calculation on the first phase angle difference and the second phase angle difference, obtaining the phase angle change value, and generating the optical wave compensation value.

[0067] S15: Perform transmission compensation on the transmission light wave of the current transformer based on the light wave compensation value.

[0068] The first phase angle difference is calculated based on the test current value and the current correction coefficient; the second phase angle difference is calculated based on the test voltage value and the voltage correction coefficient; the two phase angle differences are averaged to obtain the phase angle change value; and the light wave compensation value is generated. These technical features play an important role in solving the problem of calculating the light wave compensation value of the current transformer: by calculating the phase angle difference of the current and the voltage respectively, the influence of both the current and the voltage is taken into account; the average of the two phase angle differences can balance the influence of the current and the voltage to obtain a more accurate phase angle change value; the light wave compensation value finally generated can be used to compensate the transmission light wave of the current transformer to improve the measurement accuracy. The technical solution of the present application calculates the light wave compensation value of the current transformer by combining the current correction coefficient, the voltage correction coefficient, the test current value and the test voltage value. The specific steps include: firstly, the phase angle difference of the current and the voltage is calculated respectively, then the average of the two differences is calculated to obtain the phase angle change value, and finally the light wave compensation value is generated, and the transmission light wave of the current transformer is compensated based on the light wave compensation value, so as to improve the accuracy of the detection current and voltage data output by the current transformer.

[0069] Embodiment 2:

[0070] Figure 2A structural schematic diagram of a current transformer in an embodiment of the present invention is shown, wherein the current transformer includes a sensor module 300, a photoelectric module 100 and a detection module 200, wherein the sensor module 300 is configured with a transmission optical fiber, and the detection module 200 includes a first temperature sensor 201 for detecting the ambient temperature and a second temperature sensor 202 for detecting the working temperature of the sensor module 300, wherein the sensor module 300 is connected to the photoelectric module 100, and the sensor module 300 is used to acquire and transmit a light wave signal to the photoelectric module 100, and convert the light wave signal into current value data and voltage value data based on the photoelectric module 100.

[0071] Specifically, Figure 3 The working temperature analysis flow chart in an embodiment of the present invention is shown. The temperature data of the current transformer is obtained based on the temperature sensor. The variation range of the working temperature of the current transformer is extracted from the temperature data, including:

[0072] S111: Acquire the ambient temperature of the current transformer through a first temperature sensor 201 disposed in the working environment of the current transformer.

[0073] S112: Acquire the operating temperature of the current transformer through the second temperature sensor 202 configured in the sensor module 300 of the current transformer;

[0074] By using two temperature sensors to obtain the ambient temperature and the operating temperature respectively, and then using the temperature detection sequence to calculate the temperature conversion efficiency and the temperature change rate, the change range of the current transformer operating temperature can be accurately obtained. By analyzing the impact of the ambient temperature on the operating temperature and the change of the operating temperature over time, the temperature change of the current transformer can be more comprehensively and accurately reflected. By accurately obtaining the change range of the current transformer operating temperature, a reliable data basis can be provided for subsequent compensation adjustments, thereby improving the measurement accuracy of the current transformer, being able to better cope with complex working environments, and improving the stability and reliability of the current transformer under different temperature conditions.

[0075] S113: Calculating the temperature conversion efficiency between the ambient temperature and the operating temperature according to the temperature detection timing, and calculating the temperature change rate of the operating temperature based on the temperature detection timing.

[0076] By combining the temperature conversion efficiency and the temperature change rate to calculate the change amplitude of the operating temperature, the actual working state of the current transformer can be more accurately reflected. This method takes into account the impact of ambient temperature on the operating temperature and the change trend of the operating temperature itself, and can provide more accurate temperature change information, which is helpful for the subsequent compensation adjustment process.

[0077] Specifically, the conversion efficiency between the ambient temperature and the operating temperature can be calculated by establishing a mathematical model between the ambient temperature and the operating temperature, and the temperature change rate of the operating temperature can be obtained by continuously sampling the operating temperature and calculating the temperature change per unit time.

[0078] Specifically, the step of acquiring the temperature data of the current transformer based on the temperature sensor and extracting the variation range of the operating temperature of the current transformer from the temperature data further includes:

[0079] The change amplitude of the operating temperature is calculated based on the temperature conversion efficiency between the ambient temperature and the operating temperature combined with the temperature change rate of the operating temperature.

[0080] When calculating the change range of the working temperature, the weighted average method can be used to comprehensively consider the temperature conversion efficiency and the temperature change rate. The calculation formula for the change range of the working temperature is: ;

[0081] in, is the variation of the operating temperature, is the ambient temperature, is the initial operating temperature, is the temperature conversion efficiency, is the temperature change rate, is the time interval, α and β are weight coefficients.

[0082] When the ambient temperature is lower than the initial operating temperature, the final operating temperature may rise slightly due to the rising trend of the operating temperature itself. The combined calculation based on the ambient temperature and the operating temperature can improve the accuracy of the subsequent compensation adjustment, thereby improving the measurement accuracy of the current transformer.

[0083] Specifically, the setting of the test light wave and calculating the theoretical current value and the theoretical voltage value of the test light wave according to the variation amplitude include:

[0084] A test light wave is emitted to the sensor module 300 of the current transformer through the light-emitting component, and the test light wave transmission of the current transformer is simulated according to the change amplitude of the working temperature of the current transformer; the test light wave can be an optical signal of a specific wavelength, and its intensity and frequency can be adjusted according to the specific parameters of the current transformer.

[0085] The theoretical current value and the theoretical voltage value obtained by the current transformer based on the test light wave transmission are obtained.

[0086] According to the obtained operating temperature variation of the current transformer, the transmission process of the test light wave in the current transformer is simulated. Based on the simulated test light wave transmission results, the theoretical current value and the theoretical voltage value are obtained.

[0087] In this embodiment, a fiber laser with a wavelength of 1550nm can be selected as a light-emitting component to emit a stable test light wave. When the operating temperature of the current transformer varies from -20°C to +80°C, the transmission characteristics of the test light wave at different temperatures can be simulated within this temperature range at intervals of 5°C. By establishing a relationship model between temperature and light wave transmission characteristics, the theoretical current value and theoretical voltage value at any temperature can be accurately calculated.

[0088] By testing the effect of light wave simulation temperature change on the performance of the current transformer, the theoretical value can be obtained more accurately, providing reliable basic data for subsequent compensation adjustment.

[0089] Specifically, the setting of the test light wave and calculating the theoretical current value and the theoretical voltage value of the test light wave according to the variation amplitude further includes:

[0090] Query the physical characteristics of the transmission optical fiber according to the model of the transmission optical fiber of the current transformer;

[0091] Calculating the transmission phase difference of the transmission optical fiber based on the physical characteristics of the transmission optical fiber and the operating temperature variation of the current transformer;

[0092] The theoretical current value and the theoretical voltage value of the test light wave after being transmitted through the transmission optical fiber are calculated according to the transmission phase difference of the transmission optical fiber.

[0093] Specifically, the calculation of the transmission phase difference of the transmission optical fiber based on the physical characteristics of the transmission optical fiber and the operating temperature variation amplitude of the current transformer includes:

[0094] The transmission phase difference calculation formula of the transmission optical fiber is: ;

[0095] in, is the transmission phase difference of the transmission fiber, is the wavelength of the light wave transmitted in the optical fiber. For a transmission cycle, is the refractive index of the transmission fiber, is the length of the transmission fiber, is the change in the refractive index of the transmission fiber when it undergoes thermal expansion, is the change in refractive index of the optical fiber under stress, It is the deformation of the transmission optical fiber during thermal expansion. It is the deformation of the transmission optical fiber under stress.

[0096] Furthermore, according to the operating temperature variation range of the transmission optical fiber, the thermal expansion coefficient, thermal expansion deformation, stress deformation of the optical fiber and refractive index variation of the transmission optical fiber within the corresponding temperature variation range are queried, thereby satisfying the analysis and calculation of the optical signal transmission of the transmission optical fiber.

[0097] Specifically, the calculation of the current correction coefficient based on the test current value of the test light wave output by the current transformer and the test current value and the theoretical current value includes:

[0098] The calculation formula of the current correction coefficient is: ;

[0099] in, is the current correction factor, is the test current value, is the theoretical current value.

[0100] The test voltage value based on the test light wave output by the current transformer and the calculation of the voltage correction coefficient based on the test voltage value and the theoretical voltage value include:

[0101] The calculation formula of the current correction coefficient is: ;

[0102] in, is the voltage correction factor, is the test voltage value, is the theoretical voltage value.

[0103] Specifically, the calculation of the light wave compensation value of the current transformer according to the current correction coefficient, the voltage correction coefficient, the test current value and the test voltage value includes:

[0104] Calculate a first phase angle difference of a transmission optical fiber of a current transformer based on the test current value and the current correction coefficient;

[0105] Calculate a second phase angle difference of the transmission optical fiber of the current transformer based on the test voltage value and the voltage correction coefficient;

[0106] The first phase angle difference and the second phase angle difference are averaged to obtain a phase angle change value, and generate a light wave compensation value.

[0107] The optical wave compensation value of the current transformer is calculated according to the current correction coefficient, the voltage correction coefficient, the test current value and the test voltage value, including: calculating the first phase angle difference of the transmission optical fiber of the current transformer based on the test current value and the current correction coefficient; calculating the second phase angle difference of the transmission optical fiber of the current transformer based on the test voltage value and the voltage correction coefficient; performing mean calculation on the first phase angle difference and the second phase angle difference, obtaining the phase angle change value, and generating the optical wave compensation value.

[0108] An embodiment of the present invention provides an automatic compensation and adjustment method for a current transformer. The method obtains the operating temperature and ambient temperature of the current transformer, analyzes the change in the phase angle of the transmission optical fiber caused by the temperature in conjunction with the material of the transmission optical fiber of the current transformer, performs a simulation test based on a test light wave, and calculates the light wave compensation value, so that the current transformer can perform adaptive compensation for each measurement, thereby improving the accuracy of current measurement.

[0109] Embodiment three:

[0110] Figure 4 A schematic diagram of an automatic compensation adjustment device for a current transformer in an embodiment of the present invention is shown, wherein the adjustment device comprises:

[0111] Temperature detection component 10: used to obtain temperature data of the current transformer based on the temperature sensor, and extract the variation range of the operating temperature of the current transformer from the temperature data;

[0112] The acquisition of temperature data and the extraction of the variation range can be achieved in a variety of ways. For example, a first temperature sensor can be configured in the working environment of the current transformer to obtain the ambient temperature, and a second temperature sensor can be configured in the sensor module of the current transformer to obtain the working temperature. By calculating the temperature conversion efficiency between the ambient temperature and the working temperature, combined with the temperature change rate of the working temperature, the variation range of the working temperature can be calculated more accurately.

[0113] The test calculation component 20 is used to set the test light wave and calculate the theoretical current value and the theoretical voltage value of the test light wave according to the variation amplitude.

[0114] The test light wave is sent to the sensor module of the current transformer through the light-emitting component, and the test light wave transmission of the current transformer is simulated according to the change amplitude of the working temperature. In addition, the physical characteristics of the transmission optical fiber of the current transformer can be queried according to the model of the transmission optical fiber, and the transmission phase difference of the transmission optical fiber can be calculated based on these characteristics and the temperature change amplitude, so as to obtain more accurate theoretical current value and theoretical voltage value.

[0115] Correction calculation component 30: used to calculate the current correction factor based on the test current value and the theoretical current value based on the test current value and the test voltage value of the test light wave output by the current transformer, and to calculate the voltage correction factor based on the test voltage value and the theoretical voltage value.

[0116] Compensation calculation component 40: used to calculate the light wave compensation value of the current transformer according to the current correction coefficient, the voltage correction coefficient, the test current value and the test voltage value;

[0117] The phase angle difference of current and voltage can be calculated separately, and then the average of these two differences can be calculated to obtain the final phase angle change value, and the light wave compensation value can be generated accordingly. This method comprehensively considers the deviations of both current and voltage, and can obtain a more comprehensive compensation result.

[0118] Transmission compensation component 50: used for performing transmission compensation on the transmission light wave of the current transformer based on the light wave compensation value.

[0119] The temperature change information provided by the temperature detection component 10 provides basic data for the entire system. The test calculation component 20 generates theoretical values ​​based on these data, providing a reference standard for subsequent corrections. The correction calculation component 30 calculates the correction coefficients by comparing the actual values ​​with the theoretical values. These coefficients reflect the actual impact of temperature changes on light wave transmission. The compensation calculation component 40 uses these correction coefficients and combines the actual test values ​​to calculate the final compensation values. Finally, the transmission compensation component 50 applies these compensation values ​​to the actual light wave transmission, thereby realizing real-time compensation for the impact of temperature changes.

[0120] A person skilled in the art may understand that all or part of the steps in the various methods of the above embodiments may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, and the storage medium may include: a read-only memory (ROM), a random access memory (RAM), a disk or an optical disk, etc.

[0121] In addition, the embodiments of the present invention are described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A method for automatic compensation and adjustment of a current transformer, characterized in that: The adjustment method comprises: Acquiring temperature data of the current transformer based on a temperature sensor, and extracting a variation range of the operating temperature of the current transformer from the temperature data; Setting a test light wave, and calculating a theoretical current value and a theoretical voltage value of the test light wave according to the variation amplitude; Based on the test current value and the test voltage value of the test light wave output by the current transformer, a current correction factor is calculated based on the test current value and the theoretical current value, and a voltage correction factor is calculated based on the test voltage value and the theoretical voltage value; Calculate the light wave compensation value of the current transformer according to the current correction coefficient, the voltage correction coefficient, the test current value and the test voltage value; The transmission light wave of the current transformer is transmitted with compensation based on the light wave compensation value.

2. The automatic compensation adjustment method for current transformer according to claim 1, characterized in that: The method of acquiring temperature data of the current transformer based on the temperature sensor and extracting the variation range of the operating temperature of the current transformer from the temperature data comprises: Acquiring the ambient temperature of the current transformer by means of a first temperature sensor arranged in the working environment of the current transformer; Acquiring the operating temperature of the current transformer by means of a second temperature sensor configured in the sensing module of the current transformer; The temperature conversion efficiency between the ambient temperature and the operating temperature is calculated according to the temperature detection timing, and the temperature change rate of the operating temperature is calculated based on the temperature detection timing.

3. The automatic compensation adjustment method for current transformer according to claim 2, characterized in that: The step of acquiring the temperature data of the current transformer based on the temperature sensor and extracting the variation range of the operating temperature of the current transformer from the temperature data further comprises: The change amplitude of the operating temperature is calculated based on the temperature conversion efficiency between the ambient temperature and the operating temperature combined with the temperature change rate of the operating temperature.

4. The automatic compensation adjustment method for current transformer according to claim 1, characterized in that: The step of setting the test light wave and calculating the theoretical current value and the theoretical voltage value of the test light wave according to the variation amplitude comprises: The test light wave is emitted to the sensor module of the current transformer through the light emitting component, and the test light wave transmission of the current transformer is simulated according to the change amplitude of the working temperature of the current transformer; The theoretical current value and the theoretical voltage value obtained by the current transformer based on the test light wave transmission are obtained.

5. The automatic compensation adjustment method for current transformer according to claim 4, characterized in that: The step of setting the test light wave and calculating the theoretical current value and the theoretical voltage value of the test light wave according to the variation amplitude further comprises: Query the physical characteristics of the transmission optical fiber according to the model of the transmission optical fiber of the current transformer; Calculating the transmission phase difference of the transmission optical fiber based on the physical characteristics of the transmission optical fiber and the operating temperature variation of the current transformer; The theoretical current value and the theoretical voltage value of the test light wave after being transmitted through the transmission optical fiber are calculated according to the transmission phase difference of the transmission optical fiber.

6. The automatic compensation adjustment method for current transformer according to claim 5, characterized in that: The method of calculating the transmission phase difference of the transmission optical fiber based on the physical characteristics of the transmission optical fiber and the operating temperature variation amplitude of the current transformer comprises: The transmission phase difference calculation formula of the transmission optical fiber is: ； in, is the transmission phase difference of the transmission fiber, is the wavelength of the light wave transmitted in the optical fiber. For a transmission cycle, is the refractive index of the transmission fiber, is the length of the transmission fiber, is the change in the refractive index of the transmission fiber due to thermal expansion, is the change in refractive index of the optical fiber under stress, It is the deformation of the transmission optical fiber during thermal expansion. It is the deformation of the transmission optical fiber under stress.

7. The automatic compensation adjustment method for current transformer according to claim 1, characterized in that: The calculation of the current correction coefficient based on the test current value and the theoretical current value based on the test current value of the test light wave output by the current transformer comprises: The calculation formula of the current correction coefficient is: ； in, is the current correction factor, is the test current value, is the theoretical current value.

8. The automatic compensation adjustment method for current transformer according to claim 1, characterized in that: The test voltage value based on the test light wave output by the current transformer and the calculation of the voltage correction coefficient based on the test voltage value and the theoretical voltage value include: The calculation formula of the current correction coefficient is: ； in, is the voltage correction factor, is the test voltage value, is the theoretical voltage value.

9. The automatic compensation adjustment method for current transformer according to claim 1, characterized in that: The calculation of the light wave compensation value of the current transformer according to the current correction coefficient, the voltage correction coefficient, the test current value and the test voltage value comprises: Calculate a first phase angle difference of a transmission optical fiber of a current transformer based on the test current value and the current correction coefficient; Calculate a second phase angle difference of the transmission optical fiber of the current transformer based on the test voltage value and the voltage correction coefficient; The first phase angle difference and the second phase angle difference are averaged to obtain a phase angle change value, and generate a light wave compensation value.

10. An automatic compensation and adjustment device for a current transformer, characterized in that: The regulating device comprises: Temperature detection component: used to obtain the temperature data of the current transformer based on the temperature sensor, and extract the change amplitude of the working temperature of the current transformer from the temperature data; Test calculation component: used for setting the test light wave, and calculating the theoretical current value and the theoretical voltage value of the test light wave according to the variation amplitude; Correction calculation component: used for calculating the current correction factor based on the test current value and the theoretical current value based on the test current value and the test voltage value of the test light wave output by the current transformer, and calculating the voltage correction factor based on the test voltage value and the theoretical voltage value; Compensation calculation component: used to calculate the light wave compensation value of the current transformer according to the current correction coefficient, the voltage correction coefficient, the test current value and the test voltage value; Transmission compensation component: used to perform transmission compensation on the transmission light wave of the current transformer based on the light wave compensation value.

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