Current transformer with temperature compensation function and compensation method thereof

Abstract

The invention discloses a current transformer with a temperature compensation function and a compensation method thereof. The current transformer comprises an optical fiber sensing ring, an acquisition module, a temperature detection module and a temperature compensation module, wherein the current acquisition module is used for being connected to an optical fiber sensing ring, generating an optical signal entering the optical fiber sensing ring, and performing photoelectric conversion and signal processing on the optical signal generated by the optical fiber sensing ring under the action of a to-be-detected current to obtain a current sensing signal; the temperature detection module is used for detecting a temperature signal of the optical fiber sensing ring; and the temperature compensation module is used for determining a temperature compensation coefficient based on the temperature signal and performing temperature compensation processing on the current induction signal based on the temperature compensation coefficient. The accuracy of temperature detection is improved, and the accuracy of temperature compensation is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of current transformers, and in particular to a current transformer with a temperature compensation function and a compensation method thereof. Background Art

[0002] At present, the traditional electromagnetic current transformer has problems such as ferromagnetic saturation, DC component measurement and high-voltage insulation, which affect the safe and stable operation of the power grid. In recent years, various new electronic current transformers have been developed. Among them, the all-fiber DC current transformer is based on the Faraday magneto-optical effect to indirectly measure a large current. Its measurement principle is: when the polarized light signal is transmitted in the high-voltage side sensing fiber, it is affected by the magnetic field, and its polarization state will change. The change is related to the number of sensing fiber turns, the magnetic field size and the Verdet constant. Among them, the Verdet constant is affected by the center wavelength of the optical signal and the refractive index of the sensing fiber. At present, all-fiber current transformers control the operating temperature and working current of the SLD light source, and its luminous center wavelength remains basically unchanged. However, the change in the ambient temperature of the sensing fiber cannot control the degradation of its measurement performance, which affects its promotion and application in the field of high-precision measurement.

[0003] In the prior art, a temperature sensor is used to collect the external ambient temperature and digitally return it to the control unit. The control unit corrects the measurement output according to the actual ambient temperature and the temperature curve of the sensing optical fiber stored in the register to compensate for the measurement deviation of the DC all-optical current transformer caused by the change of ambient temperature. However, due to the defects of the on-site placement of the temperature sensor, the actual working temperature of the sensing optical fiber deviates from the temperature collected by the temperature sensor, resulting in inaccurate temperature compensation. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems in the above technology to a certain extent. To this end, the purpose of the present invention is to provide a current transformer with temperature compensation function and a compensation method thereof, so as to improve the accuracy of temperature detection and thus improve the accuracy of temperature compensation.

[0005] To achieve the above object, the embodiment of the present invention proposes a current transformer with temperature compensation function, including: an optical fiber sensing ring, a collection module, a temperature detection module, and a temperature compensation module; wherein, The current acquisition module is used to connect to the optical fiber sensing ring, generate an optical signal entering the optical fiber sensing ring, and perform photoelectric conversion and signal processing on the optical signal generated by the optical fiber sensing ring under the action of the current to be measured to obtain a current sensing signal; A temperature detection module, used to detect the temperature signal of the optical fiber sensing ring; The temperature compensation module is used to determine a temperature compensation coefficient based on a temperature signal, and perform temperature compensation processing on the current sensing signal based on the temperature compensation coefficient.

[0006] According to some embodiments of the present invention, the temperature detection module includes: a light source, a polarizer, a first decomposition point, a modulator, a second decomposition point, an analyzer, a detector and a demodulator; wherein, The light source emits a light signal, and the polarizer converts the light signal into two beams of linear polarized light. At the first decomposition point, the two beams of linear polarized light are decomposed into two beams of mutually perpendicular linear polarized light. The two beams of mutually perpendicular linear polarized light are initially phase modulated by the modulator and transmitted along the fast axis and slow axis of the polarization-maintaining optical fiber. After passing the second decomposition point, the linearly polarized light on the fast axis and the slow axis is decomposed again into two beams of linear polarized light perpendicular to each other; the analyzer only allows the two beams of linear polarized light on one axis to pass through, and the light on the other axis is filtered; through the feedback phase adjustment of the modulator, the two beams of linear polarized light have a specific phase difference and interfere when returning to the analyzer; the detector converts the interference light signal into an electrical signal; the demodulator demodulates the temperature signal according to the electrical signal to determine the temperature signal of the optical fiber sensing ring.

[0007] According to some embodiments of the present invention, the temperature compensation module includes a ceramic heating plate, and power is supplied to the ceramic heating plate, so that the temperature of the ceramic heating plate gradually increases and heats the optical fiber sensing ring.

[0008] According to some embodiments of the present invention, the temperature compensation module includes two heating solenoids with opposite winding directions, which are used to generate two magnetic fields of equal magnitude and opposite directions. The heating solenoids are placed at equal distances on both sides of the temperature detection module.

[0009] According to some embodiments of the present invention, the present invention further includes: a state detection module, configured to: Detecting a first angular velocity and a first acceleration of the temperature detection module; Determine a first angular velocity matrix according to the first angular velocity, and determine a first acceleration matrix according to the first acceleration; When the temperature detection module is in a stationary state, detecting a second angular velocity and a second acceleration of the temperature detection module; Determine a second angular velocity matrix according to the second angular velocity, and determine a second acceleration matrix according to the second acceleration; Subtracting the first angular velocity matrix from the second angular velocity matrix to obtain a third angular velocity matrix, determining a maximum value in the third angular velocity matrix, and determining whether it is less than 0 to obtain a first comparison result; Subtracting the first acceleration matrix from the second acceleration matrix to obtain a third acceleration matrix, determining a maximum value in the third acceleration matrix, and judging whether it is less than 0 to obtain a second comparison result; When it is determined that the first comparison result is that the maximum value in the third angular velocity matrix is ​​less than 0 and the second comparison result is that the maximum value in the third acceleration matrix is ​​less than 0, it indicates that the temperature detection module is in a stationary state; otherwise, the temperature detection module is in a moving state; When it is determined that the temperature detection module is in a motion state, the first variance corresponding to the third angular velocity matrix and the second variance corresponding to the third acceleration matrix are calculated, and a preset motion compensation coefficient table is queried according to the first variance and the second variance to obtain the motion compensation coefficient. The acquired temperature signal is corrected according to the motion compensation coefficient to obtain a corrected temperature signal.

[0010] According to some embodiments of the present invention, the state detection module determines the first angular velocity matrix according to the first angular velocity, and determines the first acceleration matrix according to the first acceleration, including: Construct the first angular velocity vector ω=( , , );in, , , are the angular velocity components in the x, y, and z directions respectively; The first angular velocity matrix is ​​expressed as: in, is the first angular velocity matrix; Construct the first acceleration vector a=( , , ),in, , , are the acceleration components in the x, y, and z directions respectively; The first acceleration matrix is ​​expressed as: in, is the first acceleration matrix.

[0011] According to some embodiments of the present invention, the system further includes: a verification module, configured to verify the temperature compensation processing result, and when it is determined that the verification fails, regenerate a temperature compensation instruction to the temperature compensation module.

[0012] According to some embodiments of the present invention, the temperature compensation module includes: Identify modules for: Based on a plurality of temperature signals, a preset temperature database is queried to determine temperature compensation schemes corresponding to the plurality of temperature signals, and an error parameter of the temperature compensation scheme is calculated; in, is the error parameter of the temperature compensation scheme; is the number of initial temperature compensation coefficients included in the temperature compensation scheme; The temperature compensation scheme is An initial temperature compensation coefficient; Calculate the first reliability factor of the temperature compensation scheme : in, is a natural constant; Calculate the second reliability factor of the temperature compensation scheme : in, The temperature compensation scheme is numerical values; Calculating the mean of the first reliability coefficient and the second reliability coefficient, and when it is determined that the mean is greater than a preset threshold, taking the average of several initial temperature compensation coefficients included in the temperature compensation scheme as the temperature compensation coefficient; The compensation module is used to perform temperature compensation processing on the current sensing signal based on the temperature compensation coefficient.

[0013] According to some embodiments of the present invention, a compensation method for a current transformer with a temperature compensation function includes: Based on the current acquisition module connected to the optical fiber sensing ring, an optical signal entering the optical fiber sensing ring is generated, and the optical signal generated by the optical fiber sensing ring under the action of the current to be measured is subjected to photoelectric conversion and signal processing to obtain a current sensing signal; Detecting the temperature signal of the optical fiber sensing ring based on the temperature detection module; The temperature compensation module determines a temperature compensation coefficient based on the temperature signal, and performs temperature compensation processing on the current sensing signal based on the temperature compensation coefficient.

[0014] According to some embodiments of the present invention, the temperature compensation module determines a temperature compensation coefficient based on a temperature signal, and performs temperature compensation processing on the current sensing signal based on the temperature compensation coefficient, including: Based on a plurality of temperature signals, a preset temperature database is queried to determine temperature compensation schemes corresponding to the plurality of temperature signals, and an error parameter of the temperature compensation scheme is calculated; in, is the error parameter of the temperature compensation scheme; is the number of initial temperature compensation coefficients included in the temperature compensation scheme; The temperature compensation scheme is An initial temperature compensation coefficient; Calculate the first reliability factor of the temperature compensation scheme : in, is a natural constant; Calculate the second reliability factor of the temperature compensation scheme : in, The temperature compensation scheme is numerical values; Calculating the mean of the first reliability coefficient and the second reliability coefficient, and when it is determined that the mean is greater than a preset threshold, taking the average of several initial temperature compensation coefficients included in the temperature compensation scheme as the temperature compensation coefficient; The current sensing signal is temperature compensated based on the temperature compensation coefficient.

[0015] The present invention proposes a current transformer with temperature compensation function and a compensation method thereof, which realizes accurate temperature detection and accurate temperature compensation by integrating an optical fiber sensing ring, a current acquisition module, a temperature detection module and a temperature compensation module, thereby realizing accurate measurement of current.

[0016] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description and the accompanying drawings.

[0017] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 is a block diagram of a current transformer with temperature compensation function according to an embodiment of the present invention; Figure 2 is a flow chart of a compensation method for a current transformer with temperature compensation function according to an embodiment of the present invention. DETAILED DESCRIPTION

[0019] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0020] like Figure 1 As shown, the embodiment of the present invention proposes a current transformer with temperature compensation function, including: an optical fiber sensing ring, a collection module, a temperature detection module, and a temperature compensation module; wherein, The current acquisition module is used to connect to the optical fiber sensing ring, generate an optical signal entering the optical fiber sensing ring, and perform photoelectric conversion and signal processing on the optical signal generated by the optical fiber sensing ring under the action of the current to be measured to obtain a current sensing signal; A temperature detection module, used to detect the temperature signal of the optical fiber sensing ring; The temperature compensation module is used to determine a temperature compensation coefficient based on a temperature signal, and perform temperature compensation processing on the current sensing signal based on the temperature compensation coefficient.

[0021] The working principle of the above technical solution: The optical fiber sensing ring is the core component of current sensing. It uses certain physical properties of optical fiber (such as the Faraday effect) to sense current. When current flows through a conductor, a magnetic field is generated around it. This magnetic field affects the optical signal in the optical fiber, thereby changing certain properties of the optical signal (such as the polarization state). By measuring these changes, the magnitude of the current can be indirectly measured. The current acquisition module is responsible for sending optical signals to the optical fiber sensing ring and receiving optical signals generated by the optical fiber sensing ring under the action of the current to be measured. These signals are converted into current sensing signals after photoelectric conversion and signal processing. This process converts the optical signal in the optical fiber into an electrical signal. The temperature detection module is used to monitor the working temperature of the optical fiber sensing ring in real time. Since certain physical properties of the optical fiber sensing ring (such as refractive index, thermal expansion coefficient, etc.) change with temperature, the accuracy of current measurement is affected. The temperature compensation module determines the temperature compensation coefficient based on the temperature signal provided by the temperature detection module. In one embodiment, a preset temperature signal-temperature compensation coefficient data table is queried according to the temperature signal to determine the corresponding temperature compensation coefficient. The temperature compensation coefficient is used to adjust the current sensing signal to eliminate the influence of temperature changes on the accuracy of current measurement. In this way, it is ensured that the current transformer provides accurate current measurements at different temperatures.

[0022] The beneficial effects of the above technical solution are as follows: the current transformer with temperature compensation function realizes accurate temperature detection and accurate temperature compensation by integrating the optical fiber sensing ring, the current acquisition module, the temperature detection module and the temperature compensation module, thereby realizing accurate measurement of the current.

[0023] According to some embodiments of the present invention, the temperature detection module includes: a light source, a polarizer, a first decomposition point, a modulator, a second decomposition point, an analyzer, a detector and a demodulator; wherein, The light source emits a light signal, and the polarizer converts the light signal into two beams of linear polarized light. At the first decomposition point, the two beams of linear polarized light are decomposed into two beams of mutually perpendicular linear polarized light. The two beams of mutually perpendicular linear polarized light are initially phase modulated by the modulator and transmitted along the fast axis and slow axis of the polarization-maintaining optical fiber. After passing the second decomposition point, the linearly polarized light on the fast axis and the slow axis is decomposed again into two beams of linear polarized light perpendicular to each other; the analyzer only allows the two beams of linear polarized light on one axis to pass through, and the light on the other axis is filtered; through the feedback phase adjustment of the modulator, the two beams of linear polarized light have a specific phase difference and interfere when returning to the analyzer; the detector converts the interference light signal into an electrical signal; the demodulator demodulates the temperature signal according to the electrical signal to determine the temperature signal of the optical fiber sensing ring.

[0024] The working principle of the above technical solution is as follows: the light source is a laser or LED with high stability and low noise. The polarizer converts the non-polarized light signal emitted by the light source into two beams of linearly polarized light. At the first decomposition point, the two beams of linearly polarized light are decomposed into two beams of mutually perpendicular linearly polarized light, which are initially phase modulated by the modulator and transmitted along the fast axis and slow axis of the polarization-maintaining optical fiber; the modulator is an electro-optical or magneto-optical modulator, which can change the phase of light according to an external signal (such as voltage or magnetic field). The analyzer only allows two beams of linearly polarized light on one axis to pass through, while the light on the other axis is filtered out. In this way, only two beams of linearly polarized light are left on each polarization-maintaining optical fiber. The two beams of light interfere at the analyzer to form an interference light signal. The detector converts the interference light signal into an electrical signal. This electrical signal contains temperature information, because temperature affects the physical properties of the optical fiber (such as refractive index, length, etc.), thereby changing the phase difference of the interference light signal. The demodulator demodulates the temperature signal according to the electrical signal output by the detector. Let P1 and P2 be the linear polarized light power on the fast axis and slow axis respectively. is the phase difference caused by temperature change. The interference light intensity I after the analyzer is expressed as: By measuring the interference light intensity Combined with the feedback phase of the modulator, Δ , and then get the temperature signal. Adjust the primary current on the high voltage side according to the temperature signal and the temperature compensation curve.

[0025] Beneficial effects of the above technical solution: The temperature detection module uses the principle of light interference to measure the phase difference change caused by temperature, thereby achieving accurate measurement of temperature.

[0026] According to some embodiments of the present invention, the temperature compensation module includes a ceramic heating plate, and power is supplied to the ceramic heating plate, so that the temperature of the ceramic heating plate gradually increases and heats the optical fiber sensing ring.

[0027] The working principle of the above technical solution: The ceramic heating plate is an efficient and stable heating element, which is usually composed of a ceramic substrate and a heating resistor embedded therein. When power is supplied to the ceramic heating plate, the heating resistor generates heat, causing the ceramic heating plate to heat up.

[0028] Beneficial effects of the above technical solution: The temperature compensation module compensates for the temperature change of the optical fiber sensing ring by actively heating the ceramic heating plate. When the temperature of the optical fiber sensing ring decreases, the ceramic heating plate heats the optical fiber sensing ring to increase its temperature; conversely, when the temperature of the optical fiber sensing ring increases, its temperature can be reduced by reducing power supply or stopping heating. In this way, it can be ensured that the optical fiber sensing ring maintains a relatively stable temperature during the measurement process, thereby improving the accuracy of current measurement.

[0029] According to some embodiments of the present invention, the temperature compensation module includes two heating solenoids with opposite winding directions, which are used to generate two magnetic fields of equal magnitude and opposite directions. The heating solenoids are placed at equal distances on both sides of the temperature detection module.

[0030] Working principle of the above technical solution: The heating solenoid is a highly efficient heating element, and its working principle is based on electromagnetic induction and the thermal effect of electric current. When current passes through the solenoid, a magnetic field is generated around it, and at the same time, the current generates heat through the resistor, causing the solenoid to heat up. In this module, the winding directions of the two heating solenoids are opposite, so that the directions of the magnetic fields they generate are also opposite. The two heating solenoids are placed equidistantly on both sides of the temperature detection module, which ensures that their influence on the temperature detection module is uniform. This layout helps to reduce the influence of temperature gradient on temperature detection and improve the accuracy of temperature measurement.

[0031] The beneficial effects of the above technical solution are as follows: when the ambient temperature rises, the heat generated by the heating solenoid can offset part of the influence of the ambient temperature; when the ambient temperature drops, the heat generated by the heating solenoid can be reduced by reducing the power supply to the heating solenoid or stopping the heating, thereby keeping the temperature of the surrounding environment of the temperature detection module relatively stable. In this way, the influence of temperature changes on the accuracy of temperature detection can be reduced. By using two heating solenoids with opposite winding directions and placing them at equal distances on both sides of the temperature detection module, temperature compensation of the surrounding environment of the temperature detection module is achieved.

[0032] According to some embodiments of the present invention, the present invention further includes: a state detection module, configured to: Detecting a first angular velocity and a first acceleration of the temperature detection module; Determine a first angular velocity matrix according to the first angular velocity, and determine a first acceleration matrix according to the first acceleration; When the temperature detection module is in a stationary state, detecting a second angular velocity and a second acceleration of the temperature detection module; Determine a second angular velocity matrix according to the second angular velocity, and determine a second acceleration matrix according to the second acceleration; Subtracting the first angular velocity matrix from the second angular velocity matrix to obtain a third angular velocity matrix, determining a maximum value in the third angular velocity matrix, and determining whether it is less than 0 to obtain a first comparison result; Subtracting the first acceleration matrix from the second acceleration matrix to obtain a third acceleration matrix, determining a maximum value in the third acceleration matrix, and judging whether it is less than 0 to obtain a second comparison result; When it is determined that the first comparison result is that the maximum value in the third angular velocity matrix is ​​less than 0 and the second comparison result is that the maximum value in the third acceleration matrix is ​​less than 0, it indicates that the temperature detection module is in a stationary state; otherwise, the temperature detection module is in a moving state; When it is determined that the temperature detection module is in a motion state, the first variance corresponding to the third angular velocity matrix and the second variance corresponding to the third acceleration matrix are calculated, and a preset motion compensation coefficient table is queried according to the first variance and the second variance to obtain the motion compensation coefficient. The acquired temperature signal is corrected according to the motion compensation coefficient to obtain a corrected temperature signal.

[0033] The working principle of the above technical solution is as follows: the state detection module detects the first angular velocity and the first acceleration of the temperature detection module as actual detection data, and determines the first angular velocity matrix according to the first angular velocity, and determines the first acceleration matrix according to the first acceleration. When the temperature detection module is in a stationary state, the second angular velocity and the second acceleration of the temperature detection module are detected; the second angular velocity matrix is ​​determined according to the second angular velocity, and the second acceleration matrix is ​​determined according to the second acceleration; the theoretical data when the temperature detection module is in a stationary state is accurately determined. The first angular velocity matrix is ​​subtracted from the second angular velocity matrix to obtain a third angular velocity matrix, the maximum value in the third angular velocity matrix is ​​determined, and it is judged whether it is less than 0 to obtain a first comparison result; the first acceleration matrix is ​​subtracted from the second acceleration matrix to obtain a third acceleration matrix, the maximum value in the third acceleration matrix is ​​determined, and it is judged whether it is less than 0 to obtain a second comparison result; when it is determined that the first comparison result is that the maximum value in the third angular velocity matrix is ​​less than 0 and the second comparison result is that the maximum value in the third acceleration matrix is ​​less than 0, it indicates that the temperature detection module is in a stationary state; otherwise, the temperature detection module is in a moving state; when the temperature detection module is in a stationary state, motion compensation is not required, and the measured temperature signal is relatively accurate. When the temperature detection module is in motion, the measured temperature signal will be inaccurate, and the acquired temperature signal needs to be motion compensated. When it is determined that the temperature detection module is in motion, the first variance corresponding to the third angular velocity matrix and the second variance corresponding to the third acceleration matrix are calculated. The first variance and the second variance reflect the degree of fluctuation of the angular velocity and acceleration of the temperature detection module in motion. According to the first variance and the second variance, the preset motion compensation coefficient table is queried to obtain the motion compensation coefficient, wherein the preset motion compensation coefficient table is calculated based on experimental data and is used to determine the corresponding motion compensation coefficient according to the degree of fluctuation of the angular velocity and acceleration. The acquired temperature signal is corrected according to the motion compensation coefficient to obtain a corrected temperature signal to eliminate or reduce the influence of motion on temperature measurement.

[0034] The beneficial effects of the above technical solution are as follows: the state detection module determines the motion state of the temperature detection module by detecting and analyzing the angular velocity and acceleration of the temperature detection module, and calculates the corresponding motion compensation coefficient according to the motion state to correct the temperature signal, which helps to improve the accuracy and stability of temperature measurement, especially when the temperature detection module is affected by motion.

[0035] According to some embodiments of the present invention, the state detection module determines the first angular velocity matrix according to the first angular velocity, and determines the first acceleration matrix according to the first acceleration, including: Construct the first angular velocity vector ω=( , , );in, , , are the angular velocity components in the x, y, and z directions respectively; The first angular velocity matrix is ​​expressed as: in, is the first angular velocity matrix; Construct the first acceleration vector a=( , , ),in, , , are the acceleration components in the x, y, and z directions respectively; The first acceleration matrix is ​​expressed as: in, is the first acceleration matrix.

[0036] The working principle and beneficial effects of the above technical solution: The state detection module provides an accurate mathematical tool for judging the motion state of the temperature detection module by constructing the vectors of angular velocity and acceleration and their corresponding matrices. This method not only improves the accuracy of temperature measurement, but also provides a reliable basis for subsequent temperature signal correction processing.

[0037] According to some embodiments of the present invention, the system further includes: a verification module, configured to verify the temperature compensation processing result, and when it is determined that the verification fails, regenerate a temperature compensation instruction to the temperature compensation module.

[0038] Beneficial effects of the above technical solution: The verification module provides a closed-loop control system to ensure the accuracy and reliability of temperature compensation processing. Through continuous verification and adjustment, the system can gradually approach the actual temperature value, thereby improving the accuracy of temperature detection.

[0039] According to some embodiments of the present invention, the temperature compensation module includes: Identify modules for: Based on a plurality of temperature signals, a preset temperature database is queried to determine temperature compensation schemes corresponding to the plurality of temperature signals, and an error parameter of the temperature compensation scheme is calculated; in, is the error parameter of the temperature compensation scheme; is the number of initial temperature compensation coefficients included in the temperature compensation scheme; The temperature compensation scheme is An initial temperature compensation coefficient; Calculate the first reliability factor of the temperature compensation scheme : in, is a natural constant; Calculate the second reliability factor of the temperature compensation scheme : in, The temperature compensation scheme is numerical values; Calculating the mean of the first reliability coefficient and the second reliability coefficient, and when it is determined that the mean is greater than a preset threshold, taking the average of several initial temperature compensation coefficients included in the temperature compensation scheme as the temperature compensation coefficient; The compensation module is used to perform temperature compensation processing on the current sensing signal based on the temperature compensation coefficient.

[0040] The working principle of the above technical solution: The preset temperature database is a comparison data table of temperature signal-temperature compensation scheme. The determination module first receives several temperature signals as input. Then, it queries the preset temperature database to find a temperature compensation scheme that matches these temperature signals. The error parameter S is obtained by calculating the discrete degree of each initial temperature compensation coefficient in the temperature compensation scheme. The first reliability coefficient represents the reliability of the temperature compensation scheme within the error parameter S range. The second reliability coefficient represents the reliability of a specific value in the temperature compensation scheme, taking into account the degree of its deviation from the average value. After calculating the first reliability coefficient and the second reliability coefficient, the determination module calculates their mean. If the mean is greater than the preset threshold, the temperature compensation scheme is considered to be reliable, and the average value of several initial temperature compensation coefficients is used as the final temperature compensation coefficient, which is convenient for accurately determining the temperature compensation coefficient. The compensation module receives the final determined temperature compensation coefficient from the determination module. The compensation module uses the received temperature compensation coefficient to adjust the current sensing signal to eliminate or reduce the influence of temperature on the signal.

[0041] Beneficial effects of the above technical solution: The temperature compensation module ensures the accuracy of the temperature signal through precise calculation and reliable verification mechanism. The determination module is responsible for finding the best temperature compensation scheme and calculating its reliability; while the compensation module is responsible for performing actual temperature compensation processing on the current sensing signal based on these schemes, so that the temperature compensation module can provide stable and accurate temperature compensation effect in various environments.

[0042] like Figure 2 As shown, according to some embodiments of the present invention, a compensation method for a current transformer with a temperature compensation function comprises steps S1-S3: S1, based on the current acquisition module connected to the optical fiber sensing ring, generating an optical signal entering the optical fiber sensing ring, and performing photoelectric conversion and signal processing on the optical signal generated by the optical fiber sensing ring under the action of the current to be measured, to obtain a current sensing signal; S2, detecting the temperature signal of the optical fiber sensing ring based on the temperature detection module; S3. Determine a temperature compensation coefficient based on the temperature signal through a temperature compensation module, and perform temperature compensation processing on the current sensing signal based on the temperature compensation coefficient.

[0043] The beneficial effects of the above technical solution are as follows: by integrating the optical fiber sensing ring, the current acquisition module, the temperature detection module and the temperature compensation module, accurate temperature detection and accurate temperature compensation are achieved, thereby achieving accurate measurement of the current.

[0044] According to some embodiments of the present invention, the temperature compensation module determines a temperature compensation coefficient based on a temperature signal, and performs temperature compensation processing on the current sensing signal based on the temperature compensation coefficient, including: Based on a plurality of temperature signals, a preset temperature database is queried to determine temperature compensation schemes corresponding to the plurality of temperature signals, and an error parameter of the temperature compensation scheme is calculated; in, is the error parameter of the temperature compensation scheme; is the number of initial temperature compensation coefficients included in the temperature compensation scheme; The temperature compensation scheme is An initial temperature compensation coefficient; Calculate the first reliability factor of the temperature compensation scheme : in, is a natural constant; Calculate the second reliability factor of the temperature compensation scheme : in, The temperature compensation scheme is numerical values; Calculating the mean of the first reliability coefficient and the second reliability coefficient, and when it is determined that the mean is greater than a preset threshold, taking the average of several initial temperature compensation coefficients included in the temperature compensation scheme as the temperature compensation coefficient; The current sensing signal is temperature compensated based on the temperature compensation coefficient.

[0045] Beneficial effects of the above technical solution: The temperature compensation module ensures the accuracy of the temperature signal through precise calculation and reliable verification mechanism. The determination module is responsible for finding the best temperature compensation scheme and calculating its reliability; while the compensation module is responsible for performing actual temperature compensation processing on the current sensing signal based on these schemes, so that the temperature compensation module can provide stable and accurate temperature compensation effect in various environments.

[0046] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A current transformer with temperature compensation function, characterized in that: include: Optical fiber sensing ring, acquisition module, temperature detection module, temperature compensation module; among them, The current acquisition module is used to connect to the optical fiber sensing ring, generate an optical signal entering the optical fiber sensing ring, and perform photoelectric conversion and signal processing on the optical signal generated by the optical fiber sensing ring under the action of the current to be measured to obtain a current sensing signal; A temperature detection module, used to detect the temperature signal of the optical fiber sensing ring; The temperature compensation module is used to determine a temperature compensation coefficient based on a temperature signal, and perform temperature compensation processing on the current sensing signal based on the temperature compensation coefficient.

2. The current transformer with temperature compensation function as claimed in claim 1, characterized in that: The temperature detection module includes: a light source, a polarizer, a first decomposition point, a modulator, a second decomposition point, an analyzer, a detector and a demodulator; wherein, The light source emits a light signal, and the polarizer converts the light signal into two beams of linear polarized light. At the first decomposition point, the two beams of linear polarized light are decomposed into two beams of mutually perpendicular linear polarized light. The two beams of mutually perpendicular linear polarized light are initially phase modulated by the modulator and transmitted along the fast axis and slow axis of the polarization-maintaining optical fiber. After passing the second decomposition point, the linearly polarized light on the fast axis and the slow axis is decomposed again into two beams of linear polarized light perpendicular to each other; the analyzer only allows the two beams of linear polarized light on one axis to pass through, and the light on the other axis is filtered; through the feedback phase adjustment of the modulator, the two beams of linear polarized light have a specific phase difference and interfere when returning to the analyzer; the detector converts the interference light signal into an electrical signal; the demodulator demodulates the temperature signal according to the electrical signal to determine the temperature signal of the optical fiber sensing ring.

3. The current transformer with temperature compensation function according to claim 1, characterized in that: The temperature compensation module includes a ceramic heating plate. When power is supplied to the ceramic heating plate, the temperature of the ceramic heating plate gradually increases and heats the optical fiber sensing ring.

4. The current transformer with temperature compensation function according to claim 1, characterized in that: The temperature compensation module includes two heating solenoids with opposite winding directions, which are used to generate two magnetic fields of the same magnitude and opposite directions. The heating solenoids are placed at equal distances on both sides of the temperature detection module.

5. The current transformer with temperature compensation function according to claim 1, characterized in that: Also includes: a state detection module, for: Detecting a first angular velocity and a first acceleration of the temperature detection module; Determine a first angular velocity matrix according to the first angular velocity, and determine a first acceleration matrix according to the first acceleration; When the temperature detection module is in a stationary state, detecting a second angular velocity and a second acceleration of the temperature detection module; Determine a second angular velocity matrix according to the second angular velocity, and determine a second acceleration matrix according to the second acceleration; Subtracting the first angular velocity matrix from the second angular velocity matrix to obtain a third angular velocity matrix, determining a maximum value in the third angular velocity matrix, and determining whether it is less than 0 to obtain a first comparison result; Subtracting the first acceleration matrix from the second acceleration matrix to obtain a third acceleration matrix, determining a maximum value in the third acceleration matrix, and judging whether it is less than 0 to obtain a second comparison result; When it is determined that the first comparison result is that the maximum value in the third angular velocity matrix is ​​less than 0 and the second comparison result is that the maximum value in the third acceleration matrix is ​​less than 0, it indicates that the temperature detection module is in a stationary state; otherwise, the temperature detection module is in a moving state; When it is determined that the temperature detection module is in a motion state, the first variance corresponding to the third angular velocity matrix and the second variance corresponding to the third acceleration matrix are calculated, and a preset motion compensation coefficient table is queried according to the first variance and the second variance to obtain the motion compensation coefficient. The acquired temperature signal is corrected according to the motion compensation coefficient to obtain a corrected temperature signal.

6. The current transformer with temperature compensation function as claimed in claim 5, characterized in that: The state detection module determines a first angular velocity matrix according to the first angular velocity, and determines a first acceleration matrix according to the first acceleration, including: Construct the first angular velocity vector ω=( , , );in, , , are the angular velocity components in the x, y, and z directions respectively; The first angular velocity matrix is ​​expressed as: in, is the first angular velocity matrix; Construct the first acceleration vector a=( , , ),in, , , are the acceleration components in the x, y, and z directions respectively; The first acceleration matrix is ​​expressed as: in, is the first acceleration matrix.

7. The current transformer with temperature compensation function according to claim 1, characterized in that: Also includes: The verification module is used to verify the temperature compensation processing result, and when it is determined that the verification fails, regenerate the temperature compensation instruction to the temperature compensation module.

8. The current transformer with temperature compensation function as claimed in claim 7, characterized in that: The temperature compensation module comprises: Identify modules for: Based on a plurality of temperature signals, a preset temperature database is queried to determine temperature compensation schemes corresponding to the plurality of temperature signals, and an error parameter of the temperature compensation scheme is calculated; in, is the error parameter of the temperature compensation scheme; is the number of initial temperature compensation coefficients included in the temperature compensation scheme; The temperature compensation scheme is An initial temperature compensation coefficient; Calculate the first reliability factor of the temperature compensation scheme : in, is a natural constant; Calculate the second reliability factor of the temperature compensation scheme : in, The temperature compensation scheme is numerical values; Calculating the mean of the first reliability coefficient and the second reliability coefficient, and when it is determined that the mean is greater than a preset threshold, taking the average of several initial temperature compensation coefficients included in the temperature compensation scheme as the temperature compensation coefficient; The compensation module is used to perform temperature compensation processing on the current sensing signal based on the temperature compensation coefficient.

9. The compensation method for a current transformer with temperature compensation function according to any one of claims 1 to 8, characterized in that: include: Based on the current acquisition module connected to the optical fiber sensing ring, an optical signal entering the optical fiber sensing ring is generated, and the optical signal generated by the optical fiber sensing ring under the action of the current to be measured is subjected to photoelectric conversion and signal processing to obtain a current sensing signal; Detecting the temperature signal of the optical fiber sensing ring based on the temperature detection module; The temperature compensation module determines a temperature compensation coefficient based on the temperature signal, and performs temperature compensation processing on the current sensing signal based on the temperature compensation coefficient.

10. The compensation method for a current transformer with temperature compensation function according to claim 9, characterized in that: The temperature compensation module determines a temperature compensation coefficient based on the temperature signal, and performs temperature compensation processing on the current sensing signal based on the temperature compensation coefficient, including: Based on a plurality of temperature signals, a preset temperature database is queried to determine temperature compensation schemes corresponding to the plurality of temperature signals, and an error parameter of the temperature compensation scheme is calculated; in, is the error parameter of the temperature compensation scheme; is the number of initial temperature compensation coefficients included in the temperature compensation scheme; The temperature compensation scheme is An initial temperature compensation coefficient; Calculate the first reliability factor of the temperature compensation scheme : in, is a natural constant; Calculate the second reliability factor of the temperature compensation scheme : in, The temperature compensation scheme is numerical values; Calculating the mean of the first reliability coefficient and the second reliability coefficient, and when it is determined that the mean is greater than a preset threshold, taking the average of several initial temperature compensation coefficients included in the temperature compensation scheme as the temperature compensation coefficient; The current sensing signal is temperature compensated based on the temperature compensation coefficient.

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