CN108918940B - All-fiber current mutual inductance system with temperature compensation and method - Google Patents
All-fiber current mutual inductance system with temperature compensation and method Download PDFInfo
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- CN108918940B CN108918940B CN201810698390.2A CN201810698390A CN108918940B CN 108918940 B CN108918940 B CN 108918940B CN 201810698390 A CN201810698390 A CN 201810698390A CN 108918940 B CN108918940 B CN 108918940B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/24—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-modulating devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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Abstract
The disclosure relates to a full-optical-fiber current mutual inductance system with temperature compensation and a method thereof. The system includes a fiber optic sensing loop; the acquisition processing unit is connected to the optical fiber sensing ring, generates an optical signal entering the optical fiber sensing ring and generates a secondary measurement signal; the temperature measuring unit is used for acquiring temperature data of the optical fiber sensing ring; and the temperature compensation unit is respectively connected to the acquisition processing unit and the temperature measurement unit, and is used for carrying out temperature compensation correction on the secondary measurement signal by combining a temperature compensation coefficient based on temperature data so as to enable the acquisition processing unit to output the corrected secondary measurement signal. According to the embodiment of the disclosure, the temperature compensation of the all-fiber current transformer is realized by utilizing the repetitive characteristic of the temperature ratio difference of the fiber sensing ring of the all-fiber current transformer and utilizing the determined temperature compensation coefficient, and the measurement accuracy of the all-fiber current transformer is improved.
Description
Technical Field
The disclosure relates to the technical field of power electronics, in particular to a full-optical-fiber current mutual inductance system with temperature compensation and a method thereof.
Background
The all-fiber current transformer is a power device for providing current data for devices such as electric energy metering, measurement and control, relay protection and the like in a power system. The method has the advantages of large dynamic range, good transient characteristic, digital quantity output, quick response, wide response frequency band, complete insulation for one time and two times and the like, thereby being applied more and more. The method is particularly suitable for the current measurement development needs in the fields of intelligent power grids and high-voltage direct-current transmission, and is the main development direction of the current measurement of the power system.
Along with the popularization and application of the test point engineering of the all-fiber current transformer, the technology and the process of the all-fiber current transformer also expose a lot of problems, wherein the failure rate is about dozens of times of that of the traditional electromagnetic transformer, and the reliable operation is a key problem to be solved urgently in the engineering application of the all-fiber current transformer. In the fault of the all-fiber current transformer, the problem of precision drift caused by temperature influence is a problem which is generally concerned by people. The main reasons causing the temperature drift problem include the birefringence effect of the sensing fiber loop, the manufacturing process of the optical fiber 1/4 wave plate, the influence of the temperature drift and the like. In order to suppress measurement errors caused by temperature, temperature compensation needs to be performed on a sensing loop part of the all-fiber current transformer so as to meet application requirements. The conventional method for temperature compensation of the optical fiber current transformer is difficult to perform accurate, real-time and reliable temperature compensation on the measurement error of the all-optical fiber current transformer.
Disclosure of Invention
In view of this, the present disclosure provides an all-fiber current transformer system and method with temperature compensation to effectively suppress the accuracy drift problem of the all-fiber current transformer caused by temperature.
According to one aspect of the present disclosure, an all-fiber current transformer system with temperature compensation is presented. The system comprises:
an optical fiber sensing ring;
the acquisition processing unit is connected to the optical fiber sensing ring, generates an optical signal entering the optical fiber sensing ring, and performs photoelectric conversion and signal processing on the optical signal generated by the optical fiber sensing ring under the action of current to be measured so as to generate a secondary measurement signal;
the temperature measuring unit is used for acquiring temperature data of the optical fiber sensing ring;
the temperature compensation unit is respectively connected to the acquisition processing unit and the temperature measurement unit, and performs temperature compensation correction on the secondary measurement signal by combining a temperature compensation coefficient based on the temperature data so as to enable the acquisition processing unit to output the corrected secondary measurement signal,
and when the system is in a calibration mode, determining the temperature compensation coefficient according to the corresponding relation between the temperature data and the specific difference data of the optical fiber sensing ring.
In one possible implementation, the system further includes:
the standard current transformer is characterized in that a rated current is applied to a current conductor on the primary side of the standard current transformer, and a secondary standard signal is output on the secondary side of the standard current transformer;
the merging unit is respectively connected to the standard current transformer and the acquisition processing unit, and acquires merged data based on the secondary standard signal and the secondary measurement signal;
the calibration unit is respectively connected to the merging unit and the temperature measuring unit, obtains ratio difference data based on the merged data, and obtains a temperature compensation coefficient of the optical fiber sensing ring based on the ratio difference data and the temperature data;
when the system is in a calibration mode, the optical fiber sensing ring is arranged in an incubator capable of setting temperature, and the optical fiber sensing ring is sleeved in a current lead of a primary side of the standard current transformer.
In one possible implementation manner, the optical fiber sensing ring comprises a sensing ring framework, and a reflecting mirror and a wave plate which are fixed on the sensing ring framework.
In a possible implementation manner, the temperature measuring unit includes a fluorescence temperature measuring fiber probe, a fluorescence temperature measuring fiber and a temperature measuring demodulation circuit, wherein the fluorescence temperature measuring fiber probe is fixed on the sensing ring framework to measure the temperature of the fiber sensing ring, and the fluorescence temperature measuring fiber transmits the temperature data to the temperature measuring demodulation circuit.
In a possible implementation manner, the calibration unit includes a calibration subunit and a compensation coefficient generation subunit, the calibration subunit is connected to the merging unit, and the calibration subunit obtains the ratio difference data based on the merged data; and the compensation coefficient generation subunit is connected with the verification subunit and the temperature measurement unit, and obtains the temperature compensation coefficient of the optical fiber sensing ring based on the specific difference data and the temperature data.
In a possible implementation manner, the system further includes an optical fiber insulator, and the optical cable of the optical fiber sensing ring and the fluorescence temperature measurement optical fiber are led to the acquisition processing unit and the temperature measurement demodulation circuit from an embedded channel of the optical fiber insulator.
In a possible implementation manner, the system further includes a temperature alarm unit, which is connected between the temperature measurement unit and the temperature compensation unit and outputs an alarm flag bit.
According to another aspect of the present disclosure, a method for temperature compensation of an all-fiber current transformer is provided, which is applied to an all-fiber current transformer system with temperature compensation. The method comprises the following steps:
acquiring the temperature of the optical fiber sensing ring;
acquiring information of an alarm flag bit;
judging the alarm flag bit, if the alarm flag bit is 1, sending an alarm, and directly outputting a secondary measurement signal; and if the temperature is 0, performing temperature compensation correction on the secondary measurement signal based on the temperature compensation coefficient, and outputting the corrected secondary measurement signal.
In one possible implementation, the method further includes:
starting the incubator to change the temperature of the incubator within a set range at a set rate;
acquiring specific difference data of each temperature point;
collecting temperature data of the optical fiber sensing ring at each temperature point;
determining a temperature-ratio difference mapping relation according to the ratio difference data and the temperature data of each temperature point;
and calculating the ratio difference average value of the integer temperature points in the set range based on the temperature-ratio difference mapping relation, and generating the temperature compensation coefficient.
The temperature compensation of the all-fiber current transformer is realized by utilizing the repetitive characteristic of the temperature ratio difference of the fiber sensing ring of the all-fiber current transformer, integrating the temperature measuring unit and the temperature compensation unit and utilizing the temperature compensation coefficient of the fiber sensing ring determined when the system is in a calibration mode, and the temperature correction is accurately, real-timely and reliably carried out on the measurement error of the all-fiber current transformer.
Other features and aspects of the present disclosure will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments, features, and aspects of the disclosure and, together with the description, serve to explain the principles of the disclosure.
FIG. 1 illustrates a block diagram of an all-fiber current transformer system with temperature compensation in accordance with an embodiment of the present disclosure;
FIG. 2 illustrates a block diagram of a temperature measurement unit in an all-fiber current transformer system with temperature compensation according to an embodiment of the present disclosure;
FIG. 3 illustrates a block diagram of an all-fiber current transformer system with temperature compensation in calibration mode according to an embodiment of the present disclosure;
FIG. 4 is a flow chart illustrating calibration of an optical fiber sensing loop in a method for temperature compensation of an all-fiber current transformer according to an embodiment of the present disclosure;
fig. 5 shows a flow chart of a method for temperature compensation of an all-fiber current transformer according to an embodiment of the present disclosure.
Detailed Description
Various exemplary embodiments, features and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present disclosure. It will be understood by those skilled in the art that the present disclosure may be practiced without some of these specific details. In some instances, methods, means, elements and circuits that are well known to those skilled in the art have not been described in detail so as not to obscure the present disclosure.
Fig. 1 illustrates a block diagram of an all-fiber current transformer system with temperature compensation in accordance with an embodiment of the present disclosure. As shown in FIG. 1, the system includes an optical fiber sensing ring 10, an acquisition processing unit 20, a temperature measuring unit 30, and a temperature compensating unit 40.
The optical fiber sensing ring 10 includes a sensing ring frame 11 formed of an optical fiber, and a reflecting mirror 12 and a wave plate 13 (e.g., 1/4 wave plate) fixed to the sensing ring frame 11. The reflector 12 and the wave plate 13 are key components of the current sensing of the all-fiber current transformer.
The acquisition processing unit 20 is a signal processing unit that performs photoelectric signal conversion, demodulation, and modulation, and mainly includes an optical path portion that performs optical information conversion and photoelectric conversion, and a circuit portion that performs signal processing.
The collecting and processing unit 20 is connected to the optical fiber sensing ring 10, generates an optical signal entering the optical fiber sensing ring 10, and performs photoelectric conversion and signal processing on the optical signal generated by the optical fiber sensing ring 10 under the action of the current to be measured to generate a secondary measurement signal.
Specifically, in the normal operation mode of the system, as shown in fig. 1, after passing through the coupler 202 and the polarizer 203, the light emitted from the light source 201 is split into two orthogonal linearly polarized light beams, and the two orthogonal linearly polarized light beams are transmitted to the fiber sensing ring 10 along the X, Y positive modes of the polarization maintaining fiber delay line 205. At the lambda/4 wave plate 13 of the optical fiber sensing ring 10, the two linearly polarized lights are respectively converted into a left-handed circularly polarized light and a right-handed circularly polarized light, and enter the sensing optical fiber forming the sensing ring framework 11. In the sensing optical fiber, under the action of current to be measured, two beams of circular polarized light have different transmission speeds due to the Faraday magneto-optical effect, so that Faraday phase difference is generated. When two beams of circularly polarized light are transmitted to the tail end of the sensing optical fiber, mirror reflection occurs at the reflecting mirror 12, the two beams of light are subjected to mode interchange, namely, left rotation is changed into right rotation, right rotation is changed into left rotation, then the two beams of light return along the original optical path, the Faraday effect is doubled, and the two beams of light are converted into two beams of mode orthogonal linearly polarized light again at the lambda/4 wave plate 13, and the modes are also interchanged. Finally, two beams of light carrying faraday effect phase information interfere at the polarizer 203, then enter the photodetector 206 through the coupler 202, and an interference light intensity signal output from the photodetector 206 is output to a subsequent signal processing circuit. The a/D conversion circuit 207 performs a/D conversion on the light intensity signal carrying current information, and the output digital signal passes through the preamplifier 208, the demodulator 209, the accumulation integrator 210, and the filter 211, and then the signal output circuit 212 outputs a secondary measurement signal generated under the action of the current to be measured.
Among them, the demodulation circuit 209, the accumulation integration circuit 210, the filter circuit 211, and the signal output are provided on the CPU processing board 200.
Fig. 2 illustrates a block diagram of a temperature measurement unit in an all-fiber current transformer system with temperature compensation according to an embodiment of the present disclosure. The temperature measuring unit 30 is used for acquiring temperature data of the optical fiber sensing ring 10. As shown in fig. 2, the temperature measurement unit 30 includes a fluorescence temperature measurement optical fiber probe 31, a fluorescence temperature measurement optical fiber 32, and a temperature measurement demodulation circuit 33. The fluorescence temperature measurement optical fiber probe 31, the reflector 12 and the wave plate 13 are fixed in the sensing ring framework 11 of the primary side high-voltage field together, and environmental temperature data of the optical fiber sensing ring 10 are measured nearby. The fluorescence temperature measurement optical fiber 32 is connected with the fluorescence temperature measurement optical fiber probe 31, and the temperature data is transmitted to the temperature measurement demodulation circuit 33 on the secondary low voltage side through the fluorescence temperature measurement optical fiber 32.
The fluorescence temperature measurement optical fiber probe 31 can accurately measure the temperature of the optical fiber sensing ring; the fluorescence temperature measurement optical fiber 32 is insulated in high voltage and resistant to electromagnetic interference, so that the system works stably and reliably without drift; the temperature measurement demodulation circuit 33 is preferably integrated on the CPU processing board 200, so that the system is highly integrated, small, flexible, and easy to maintain.
The temperature compensation unit 40 is respectively connected to the acquisition processing unit 20 and the temperature measurement unit 30, and performs temperature compensation correction on the secondary measurement signal of the acquisition processing unit 20 by combining a temperature compensation coefficient solidified in the temperature compensation unit 40 based on the temperature data of the optical fiber sensing ring 10 measured by the temperature measurement unit 30, so that the acquisition processing unit outputs the corrected secondary measurement signal.
Before the system can work normally, the optical fiber sensing loop in the system needs to be calibrated in a calibration mode, that is, the temperature compensation coefficient of the optical fiber sensing loop 10 is determined by obtaining the corresponding relationship between the temperature data and the specific difference data of the optical fiber sensing loop 10.
The ratio difference data is the percentage of the difference between a secondary measurement signal actually generated by the all-fiber current transformer system and the primary side actual input signal after the secondary measurement signal is converted by the rated transformation ratio of the current transformer to the primary side actual input signal. The ratio difference data may also be obtained while the system is in calibration mode.
Fig. 3 illustrates a block diagram of an all-fiber current transformer system with temperature compensation in calibration mode according to an embodiment of the present disclosure. When the system is in the calibration mode, the standard current transformer 110, the merging unit 120 and the calibration unit 130 need to be added compared to the normal operation mode, and the optical fiber sensing loop 10 to be calibrated needs to be arranged in the incubator 100 capable of setting the temperature. In the calibration mode, the system is configured as shown in FIG. 3.
The optical fiber sensing ring 10 is sleeved in a current lead of a primary side of the standard current transformer 110, and a rated current generated by the primary side of the standard current transformer 110 is applied to the current lead. The current leads are typically high current wires. The secondary side of the standard current transformer 110 outputs a secondary standard signal.
The acquisition processing unit 20 operates in a similar manner in the calibration mode as it does in the operational mode. The collecting and processing unit 20 is connected to the optical fiber sensing ring 10, generates an optical signal entering the optical fiber sensing ring 10, and performs photoelectric conversion and signal processing on the optical signal generated by the optical fiber sensing ring 10 under the action of a rated current in a current conductor on the primary side of the standard current transformer 100 to generate a secondary measurement signal.
The temperature measuring unit 30 operates in a similar manner in the calibration mode as it does in the operating mode. The temperature measuring unit 30 obtains the temperature data of the optical fiber sensing ring 10 through the fluorescence temperature measuring optical fiber probe 31, and transmits the temperature data to the temperature measuring demodulation circuit 33 on the secondary low voltage side through the fluorescence temperature measuring optical fiber 32, so as to obtain the temperature data of the optical fiber sensing ring 10.
The merging unit 120 is connected to the standard current transformer 110 and the collecting and processing unit 20, respectively, and obtains merging data of the two based on the secondary standard signal output by the standard current transformer 110 and the secondary measurement signal output by the collecting and processing unit 20. The calibration unit 130 is respectively connected to the merging unit 120 and the temperature measuring unit 30, obtains ratio difference data of the secondary standard signal and the secondary measurement signal based on the merged data output by the merging unit 120, and obtains a temperature compensation coefficient of the optical fiber sensing loop 10 based on the ratio difference data and the temperature data output by the temperature measuring unit 30.
In one example, the calibration unit 130 includes a calibration subunit and a compensation coefficient generation subunit. The syndrome unit is connected to the merging unit 120, and obtains the ratio difference data based on the merged data output by the merging unit 120; the compensation coefficient generating subunit is connected with the checking subunit and the temperature measuring unit 30, and obtains the temperature compensation coefficient of the optical fiber sensing ring based on the specific difference data and the temperature data.
Fig. 4 shows a flowchart for calibrating an optical fiber sensing loop in a temperature compensation method of an all-fiber current transformer according to an embodiment of the present disclosure. Specifically, when the system is in the calibration mode, the fiber sensing loop may be calibrated by the method shown in fig. 4 to obtain the temperature compensation coefficient of the fiber sensing loop. As shown in fig. 4, the method may include steps S101 to S105.
In step S101, the incubator is started, the temperature of the incubator is changed at a set rate within a set range, and the cycle can be from a low temperature to a high temperature within the set range.
For example, after the incubator is started, it is cycled at a temperature rate of-40 to +70 ℃ at 1 ℃/min.
In step S102, the ratio difference data for each temperature point is acquired.
Specifically, at each temperature point in the temperature variation process of the incubator, the difference operation is carried out by utilizing the secondary standard signal and the secondary measurement signal to obtain the specific difference data. For example, the all-fiber current transformer system with temperature compensation according to the embodiment of the present disclosure is set to the calibration mode, at each temperature point, the merging unit 120 is used to merge the secondary standard signal output by the standard current transformer 110 and the secondary measurement signal output by the acquisition processing unit 20, and the data output by the merging unit 120 is subjected to the arithmetic operation in the syndrome unit of the calibration unit 130 to obtain the arithmetic operation data at the temperature point. In this way, the ratio difference data of the respective temperature points can be obtained.
In step S103, temperature data of the optical fiber sensing loop at each temperature point is collected.
For example, the all-fiber current transformer system with temperature compensation according to the embodiment of the present disclosure is set to the calibration mode, and at each temperature point, the fluorescence temperature measurement fiber probe 31 is used to obtain the temperature data of the fiber sensing ring 10, and the temperature data is conducted to the temperature measurement demodulation circuit 33 on the secondary low voltage side through the fluorescence temperature measurement fiber 32, so as to obtain the temperature data of the fiber sensing ring 10 at each temperature point.
In step S104, a correspondence relationship between the temperature data and the ratio difference data, that is, a temperature-ratio difference mapping relationship is determined based on the ratio difference data and the temperature data of each temperature point.
In step S105, a ratio difference average value of integer temperature points within a set range is calculated based on the temperature-ratio difference map, and a temperature compensation coefficient is generated.
Based on the temperature-ratio difference mapping relationship determined in step S104, the average value of the ratio differences at all the integer temperature points within the set range is fitted, thereby generating temperature compensation coefficients at the respective integer temperature points. In a possible implementation manner, the system further includes an optical fiber insulator 50, and the optical cable of the optical fiber sensing ring 10 and the fluorescence temperature measurement optical fiber 32 are led to the acquisition processing unit 20 and the temperature measurement demodulation circuit 33 from the pre-buried channel of the optical fiber insulator 50. The optical fiber insulator 50 is a high-voltage power insulation device, and is used to connect the primary side and the secondary side power devices, and plays a role in supporting and insulating.
In a possible implementation manner, the system further includes a temperature alarm unit 60, which is connected between the temperature measurement unit 30 and the temperature compensation unit 40 and outputs an alarm flag bit. The alarm flag bit is either 0 or 1.
Fig. 5 shows a flow chart of a method for temperature compensation of an all-fiber current transformer according to an embodiment of the present disclosure. As shown in fig. 5, the method may include steps S201 to S205.
In step S201, the temperature of the optical fiber sensing ring is acquired.
For example, the fluorescence temperature measurement optical fiber probe 31 in the all-fiber current transformer system with temperature compensation according to the embodiment of the present disclosure is used to obtain the temperature data of the optical fiber sensing ring 10, and the temperature data is transmitted to the temperature measurement demodulation circuit 33 on the secondary low voltage side through the fluorescence temperature measurement optical fiber 32, so as to obtain the real-time temperature of the optical fiber sensing ring 10.
In step S202, information of the alarm flag is acquired.
For example, an alarm flag of the temperature alarm unit 60 in the all-fiber current transformer system with temperature compensation according to the embodiment of the present disclosure is obtained.
In step S203, the alarm flag is determined. If the value is 1, it indicates that the temperature is abnormal, and step S204 is executed, and if the value is 0, step S205 is executed.
In step S204, an alarm is issued, and the secondary measurement signal is directly output without temperature compensation.
In step S205, the secondary measurement signal is subjected to temperature compensation correction based on the temperature compensation coefficient, and the corrected secondary measurement signal is output.
By setting the temperature alarm function, the alarm is sent out when the temperature is abnormal, the temperature compensation mechanism is closed, and the reliability is high.
By utilizing the temperature compensation coefficient obtained by the system in the calibration mode, the precision can reach 0.02s level at the temperature of-40 to +70 ℃ according to the real-time compensation and closed-loop output result of the temperature fluctuation when the system works.
Having described embodiments of the present disclosure, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (8)
1. An all-fiber current transformer system with temperature compensation, the system comprising:
an optical fiber sensing ring;
the acquisition processing unit is connected to the optical fiber sensing ring, generates an optical signal entering the optical fiber sensing ring, and performs photoelectric conversion and signal processing on the optical signal generated by the optical fiber sensing ring under the action of current to be measured so as to generate a secondary measurement signal;
the temperature measuring unit is used for acquiring temperature data of the optical fiber sensing ring;
the temperature compensation unit is respectively connected to the acquisition processing unit and the temperature measurement unit, and performs temperature compensation correction on the secondary measurement signal by combining a temperature compensation coefficient based on the temperature data so as to enable the acquisition processing unit to output the corrected secondary measurement signal,
when the system is in a calibration mode, acquiring temperature data of the optical fiber sensing ring at each temperature point; determining a corresponding relation between the temperature data and the specific difference data according to the specific difference data and the temperature data of each temperature point; and calculating the average value of the ratio differences of the integer temperature points in the set range based on the corresponding relation between the temperature data and the ratio difference data, and generating the temperature compensation coefficient.
2. The system of claim 1, further comprising:
the standard current transformer is characterized in that a rated current is applied to a current conductor on the primary side of the standard current transformer, and a secondary standard signal is output on the secondary side of the standard current transformer;
the merging unit is respectively connected to the standard current transformer and the acquisition processing unit, and acquires merged data based on the secondary standard signal and the secondary measurement signal;
the calibration unit is respectively connected to the merging unit and the temperature measuring unit, obtains ratio difference data based on the merged data, and obtains a temperature compensation coefficient of the optical fiber sensing ring based on the ratio difference data and the temperature data;
when the system is in a calibration mode, the optical fiber sensing ring is arranged in an incubator capable of setting temperature, and the optical fiber sensing ring is sleeved in a current lead of a primary side of the standard current transformer.
3. The system of claim 1, wherein the fiber optic sensor ring comprises a sensor ring backbone and a mirror and a wave plate secured to the sensor ring backbone.
4. The system of claim 3, wherein the temperature measurement unit comprises a fluorescence temperature measurement fiber probe, a fluorescence temperature measurement fiber and a temperature measurement demodulation circuit, wherein the fluorescence temperature measurement fiber probe is fixed on the sensing ring framework to measure the temperature of the fiber sensing ring and transmit the temperature data to the temperature measurement demodulation circuit via the fluorescence temperature measurement fiber.
5. The system according to claim 2, wherein the calibration unit comprises a check subunit and a compensation coefficient generation subunit, the check subunit is connected with the merging unit, and the comparison data is obtained based on the merged data; and the compensation coefficient generation subunit is connected with the verification subunit and the temperature measurement unit, and obtains the temperature compensation coefficient of the optical fiber sensing ring based on the specific difference data and the temperature data.
6. The system of claim 4, further comprising an optical fiber insulator, wherein the optical cable of the optical fiber sensing ring and the fluorescence temperature measurement optical fiber are led to the acquisition processing unit and the temperature measurement demodulation circuit from a pre-buried channel of the optical fiber insulator.
7. The system of claim 6, further comprising a temperature alarm unit coupled between the temperature measurement unit and the temperature compensation unit, and outputting an alarm flag.
8. An all-fiber current transformer temperature compensation method applied to the all-fiber current transformer system with temperature compensation of claim 2 or 5, wherein the method comprises:
acquiring the temperature of the optical fiber sensing ring;
acquiring information of an alarm flag bit;
judging the alarm flag bit, if the alarm flag bit is 1, sending an alarm, and directly outputting a secondary measurement signal; if the temperature is 0, performing temperature compensation correction on the secondary measurement signal based on the temperature compensation coefficient, and outputting the corrected secondary measurement signal;
when the system is in a calibration mode, the method further comprises:
starting the incubator to change the temperature of the incubator within a set range at a set rate;
acquiring specific difference data of each temperature point;
collecting temperature data of the optical fiber sensing ring at each temperature point;
determining a temperature-ratio difference mapping relation according to the ratio difference data and the temperature data of each temperature point;
and calculating the ratio difference average value of the integer temperature points in the set range based on the temperature-ratio difference mapping relation, and generating the temperature compensation coefficient.
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| CN110988452A (en) * | 2019-11-28 | 2020-04-10 | 北京自动化控制设备研究所 | A method for precise temperature compensation of optical fiber current transformer |
| CN111638480B (en) * | 2020-06-09 | 2022-10-11 | 广东省计量科学研究院（华南国家计量测试中心） | Current sensor calibration system and method based on temperature compensation |
| CN111650418A (en) * | 2020-06-12 | 2020-09-11 | 江苏易立电气股份有限公司 | Temperature compensation method for intelligent low-voltage shunt sensor |
| CN112763782A (en) * | 2020-12-14 | 2021-05-07 | 河南平高电气股份有限公司 | All-fiber sensing ring of current transformer |
| CN112986650A (en) * | 2021-01-20 | 2021-06-18 | 河南平高电气股份有限公司 | All-fiber current transformer and temperature compensation method thereof |
| CN112986892B (en) * | 2021-02-19 | 2021-10-15 | 北京世维通光智能科技有限公司 | Optical fiber current sensor factory and engineering field calibration method and calibration device |
| CN114295883B (en) * | 2022-01-06 | 2023-08-22 | 南京大学 | Multi-dimensional calibration method for improving measurement accuracy of optical fiber current sensor |
| CN115436682A (en) * | 2022-08-11 | 2022-12-06 | 常州博瑞电力自动化设备有限公司 | Optical fiber current transformer and compensation method for improving current measurement precision of transformer |
| CN115327206B (en) * | 2022-10-13 | 2023-03-24 | 北京世维通光智能科技有限公司 | Current acquisition method, device and equipment based on optical fiber current sensor |
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| CN102721847B (en) * | 2012-06-15 | 2014-12-10 | 天津光拓科技有限公司 | Hybrid grating on-line temperature measurement type all-fiber current transformer and current detection method thereof |
| CN104950154B (en) * | 2014-03-31 | 2018-07-31 | 北京自动化控制设备研究所 | A kind of highly reliable all-fiber current transformator of high-precision |
| CN105301348A (en) * | 2014-05-27 | 2016-02-03 | 深圳市方隅光电科技有限公司 | Temperature characteristic testing system and method of all-fiber optical current transformer |
| CN104459267B (en) * | 2014-11-27 | 2017-05-24 | 哈尔滨理工大学 | Thin film type all-fiber current transformer with temperature compensation |
| CN104569897B (en) * | 2014-12-11 | 2018-05-22 | 许继集团有限公司 | A kind of electronic current mutual inductor check system based on standard Rogowski coil |
| CN105974172A (en) * | 2016-06-01 | 2016-09-28 | 南京南瑞继保电气有限公司 | All-fiber current transformer based on polarization maintaining fiber temperature sensor |
| CN106707015A (en) * | 2016-11-09 | 2017-05-24 | 广东电网有限责任公司电力科学研究院 | High-performance self-calibrated photoelectric combined type current transformer and self-calibration method thereof |
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2018
- 2018-06-29 CN CN201810698390.2A patent/CN108918940B/en active Active
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