CN111638480B - Current sensor calibration system and method based on temperature compensation - Google Patents
Current sensor calibration system and method based on temperature compensation Download PDFInfo
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- CN111638480B CN111638480B CN202010519138.8A CN202010519138A CN111638480B CN 111638480 B CN111638480 B CN 111638480B CN 202010519138 A CN202010519138 A CN 202010519138A CN 111638480 B CN111638480 B CN 111638480B
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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
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
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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
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
- G01R35/007—Standards or reference devices, e.g. voltage or resistance standards, "golden references"
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a current sensor calibration system and method based on temperature compensation, wherein the system comprises a direct current source, a standard ammeter, an error calculation device, a Dewar, a current sensor to be measured and a temperature sensor for measuring the field temperature; a second power supply end is arranged on the outer wall of the bottom of the first power supply end arranged on the outer wall of the top of the Dewar, a plurality of superconducting wire strips connected in parallel are arranged in the Dewar, the first end of each superconducting wire strip penetrates through the top of the Dewar to be connected with the first power supply end, and the second end penetrates through the bottom of the Dewar to be connected with the second power supply end; the first power supply end is connected with the negative electrode of the direct current source through a standard ammeter, and the second power supply end is connected with the positive electrode of the direct current source. The invention carries out temperature compensation on the current values output by the current sensor at different temperatures, and then calibrates the compensated current values, thereby being beneficial to ensuring the accuracy of the measurement of the current sensor in a specific temperature interval.
Description
Technical Field
The present invention relates to current sensor calibration, and more particularly, to a system and method for calibrating a current sensor based on temperature compensation.
Background
The current sensor has very wide application in social life, can quickly measure the current condition in a line, and provides convenience for subsequent analysis, overcurrent protection and other work of the line.
However, the current sensor is a measuring device, and has certain errors, so that the current sensor needs to be calibrated to ensure the testing accuracy of the device. However, the current sensor is often also subject to temperature, which affects its accuracy.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a current sensor calibration system and a method based on temperature compensation.
The purpose of the invention is realized by the following technical scheme: a current sensor calibration system based on temperature compensation comprises a direct current source, a standard ammeter, an error calculation device, a Dewar, a current sensor to be measured and a temperature sensor for measuring the field temperature;
a first power supply end is arranged on the outer wall of the top of the Dewar, a second power supply end is arranged on the outer wall of the bottom of the Dewar, a plurality of superconducting wire strips connected in parallel are arranged in the Dewar, the first end of each superconducting wire strip penetrates through the top of the Dewar to be connected with the first power supply end, and the second end of each superconducting wire strip penetrates through the bottom of the Dewar to be connected with the second power supply end; the first power supply end is connected with the negative electrode of the direct current source through a standard ammeter, and the second power supply end is connected with the positive electrode of the direct current source; the output ends of the standard ammeters are connected with an error calculation device;
a magnetic flux measuring loop of the current sensor is sleeved on the Dewar, and the plane of the magnetic flux measuring loop of the current sensor is intersected with the superconducting wire strip; the output ends of the current sensor and the temperature sensor are both connected with the error calculation device;
the error calculation device is used for acquiring current values output by the current sensors at different temperatures when the output of the direct current source is kept unchanged, calculating the ratio of the current value output by the current sensor at a reference temperature to the current value output by the current sensor at different temperatures, obtaining temperature coefficients of the current values at different temperatures and generating a temperature coefficient table; when the current sensor is actually calibrated, temperature compensation is carried out on the current value output by the current sensor according to the temperature coefficient table and the temperature acquired by the current temperature sensor; and comparing the compensated current value with the current value output by the standard ammeter, calculating the measurement error of the current sensor, and accordingly completing the calibration of the current sensor.
The error calculation device comprises a storage unit, a display unit and a data processing unit; the data processing unit is respectively connected with the output ends of the standard ammeter, the temperature sensor and the current sensor, and the data processing unit is respectively connected with the storage unit and the display unit;
the data processing unit is used for acquiring current values output by the current sensors at different temperatures when the output of the direct current source is kept unchanged, calculating the ratio of the current value output by the current sensor at a reference temperature to the current value output by the current sensor at different temperatures, obtaining temperature coefficients of the current values at different temperatures and generating a temperature coefficient table; when the current sensor is actually calibrated, temperature compensation is carried out on the current value output by the current sensor according to the temperature coefficient table and the temperature acquired by the current temperature sensor; comparing the compensated current value with a current value output by a standard ammeter, calculating the measurement error of the current sensor, and accordingly completing the calibration of the current sensor;
the storage unit is used for storing the temperature coefficient table and the measurement error of the current sensor;
and the display unit is used for displaying the temperature coefficient meter and the measurement error of the current sensor.
Preferably, the first power supply end and the second power supply end are both metal electrodes; the first power supply end is fixed on the outer wall of the top of the Dewar through a screw, and the second power supply end is fixed on the outer wall of the bottom of the Dewar through a screw so as to be convenient to detach. The temperature sensor is arranged in the current sensor to be measured or near the current sensor to be measured. The magnetic flux measuring loop of the current sensor has a fixed type and an open type, and for the fixed type, the magnetic flux measuring loop can be sleeved on the Dewar by temporarily disconnecting the front end and the rear end of the Dewar from the power supply end.
A method for calibrating a current sensor based on temperature compensation comprises the following steps:
s1, arranging the calibration system in a closed test space, and enabling a standard ammeter to be always at a reference temperature in a single constant-temperature small space in the space;
s2, transmitting the acquired information to an error calculation device by the current sensor and the temperature sensor;
s3, adjusting the temperature of the closed test space, keeping the output of the direct current source unchanged, and repeating the step S2 at different temperatures to obtain current values output by the current sensors at different temperatures;
s4, the error calculation device obtains the ratio of the current value output by the current sensor at the reference temperature to the current value output by the current sensor at different temperatures to obtain the temperature coefficients of the current values at different temperatures, and a temperature coefficient table is generated;
s5, when the test space is in a preset specific temperature range, calibrating the current sensor, and transmitting acquired information to an error calculation device by using a standard ammeter, the current sensor and the temperature sensor in the calibration process;
s6, finding a corresponding temperature coefficient in the temperature coefficient table by the error calculation device according to the temperature acquired by the current temperature sensor, and compensating the current value output by the current sensor by using the temperature coefficient;
and S7, comparing the compensated current value with the current value output by the standard ammeter by the error calculation device, calculating the measurement error of the current sensor, and storing and displaying the measurement error.
The invention has the beneficial effects that: the invention carries out temperature compensation on the output values of the current sensor at different temperatures, and then carries out calibration based on the compensated output values, thereby being beneficial to ensuring the accuracy of the measurement of the current sensor in a specific temperature interval.
Drawings
FIG. 1 is a schematic block diagram of the system of the present invention;
FIG. 2 is a flow chart of a method of the present invention;
in the figure, 1-a first power supply end, 2-a second power supply end, 3-a superconducting wire strip, 4-a direct current source, 5-a standard ammeter, 6-a magnetic flux measurement loop, 7-an error calculation device and 8-a temperature sensor.
Detailed Description
The technical solutions of the present invention are further described in detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the following.
As shown in fig. 1, a current sensor calibration system based on temperature compensation comprises a direct current source 4, a standard ammeter 5, an error calculation device 7, a dewar, a current sensor to be measured, and a temperature sensor 8 for measuring the temperature of the field;
a first power supply end 1 is arranged on the outer wall of the top of the Dewar, a second power supply end 2 is arranged on the outer wall of the bottom of the Dewar, a plurality of superconducting wire strips 3 connected in parallel are arranged in the Dewar, the first end of each superconducting wire strip 3 penetrates through the top of the Dewar to be connected with the first power supply end 1, and the second end of each superconducting wire strip 3 penetrates through the bottom of the Dewar to be connected with the second power supply end 2; the first power supply end 1 is connected with the negative electrode of the direct current source 4 through a standard ammeter 5, and the second power supply end 2 is connected with the positive electrode of the direct current source 4; the output ends of the standard ammeters 5 are connected with an error calculation device 7;
a magnetic flux measuring loop 6 of the current sensor is sleeved on the Dewar, and the plane of the magnetic flux measuring loop 6 of the current sensor is intersected with the superconducting wire strip 3; the output ends of the current sensor and the temperature sensor 8 are both connected with the error calculation device 7;
the error calculation device 7 is used for acquiring current values output by the current sensors at different temperatures when the output of the direct current source is kept unchanged, calculating the ratio of the current value output by the current sensor at a reference temperature to the current value output by the current sensor at different temperatures, obtaining temperature coefficients of the current values at different temperatures and generating a temperature coefficient table; when the current sensor is actually calibrated, temperature compensation is carried out on the current value output by the current sensor according to the temperature coefficient table and the temperature acquired by the current temperature sensor; and comparing the compensated current value with the current value output by the standard ammeter, calculating the measurement error of the current sensor, and accordingly completing the calibration of the current sensor.
In the embodiment of the application, specifically, when the superconducting wire tape adopts a YBCO tape, the dewar space is filled with liquid nitrogen; when the superconducting wire strip adopts a niobium-titanium wire, liquid helium is filled in the Dewar; the current sensor is a non-contact direct current sensor and can be a Hall sensor, a zero magnetic flux sensor or an optical fiber sensor. The error calculation device 7 comprises a storage unit, a display unit and a data processing unit; the data processing unit is respectively connected with the output ends of the standard ammeter 5, the temperature sensor 8 and the current sensor, and the data processing unit is respectively connected with the storage unit and the display unit;
in some embodiments of the present application, during the specific calibration, the dewar needs to be laid horizontally, so that the centers of the top outer wall or the bottom outer wall of the dewar are located on the same horizontal plane, and thus even though a small part of liquid nitrogen/liquid helium in the dewar may be not filled, the superconducting wire strip can be located in the liquid nitrogen/liquid helium as much as possible, and is ensured to be in the superconducting state; in other embodiments, a liquid conduit may be disposed on a side wall of the dewar, a bottom of the liquid conduit is communicated with an inside of the dewar, and a top of the liquid conduit is higher than an outer wall of the top of the dewar, so as to facilitate addition of liquid nitrogen/liquid helium, so that the inside of the dewar is filled with liquid nitrogen/liquid helium, and thus the superconducting wire strip is ensured to be in a superconducting state.
The data processing unit is used for acquiring current values output by the current sensors at different temperatures when the output of the direct current source is kept unchanged, calculating the ratio of the current value output by the current sensor at a reference temperature to the current value output by the current sensor at different temperatures, obtaining temperature coefficients of the current values at different temperatures and generating a temperature coefficient table; when the current sensor is actually calibrated, temperature compensation is carried out on the current value output by the current sensor according to the temperature coefficient table and the temperature acquired by the current temperature sensor; comparing the compensated current value with a current value output by a standard ammeter, calculating the measurement error of the current sensor, and accordingly completing the calibration of the current sensor;
the storage unit is used for storing the temperature coefficient table and the measurement error of the current sensor;
and the display unit is used for displaying the temperature coefficient table and the measurement error of the current sensor.
The first power supply end 1 and the second power supply end 2 are both metal electrodes; first power supply end 1 passes through the fix with screw in the top outer wall of dewar, second power supply end 2 passes through the fix with screw in the bottom outer wall of dewar to convenient to dismantle. The temperature sensor 8 is arranged in the current sensor to be measured or near the current sensor to be measured. The magnetic flux measuring loop of the current sensor has a fixed type and an open type, and for the fixed type, the magnetic flux measuring loop can be sleeved on the Dewar by temporarily disconnecting the front end and the rear end of the Dewar from the power supply end.
As shown in fig. 2, a method for calibrating a current sensor based on temperature compensation includes the following steps:
s1, arranging the calibration system in a closed test space, and enabling a standard ammeter to be in a single constant-temperature small space in the space, so as to ensure that the standard ammeter is always at a reference temperature;
s2, the current sensor and the temperature sensor 8 transmit the acquired information to an error calculation device;
s3, adjusting the temperature of the closed test space, keeping the output of the direct current source unchanged, and repeating the step S2 at different temperatures to obtain current values output by the current sensors at different temperatures;
s4, the error calculation device 7 obtains the temperature coefficients of the current values at different temperatures by comparing the current values output by the current sensor at the reference temperature with the current values output at different temperatures, and generates a temperature coefficient table;
s5, when the test space is in a preset specific temperature interval, the current sensor starts to be calibrated, and in the calibration process, the standard ammeter 5, the current sensor and the temperature sensor 8 transmit acquired information to the error calculation device 7;
s6, the error calculation device 7 finds a corresponding temperature coefficient in the temperature coefficient table according to the temperature acquired by the current temperature sensor, and compensates the current value output by the current sensor by using the temperature coefficient; the temperature compensation is that the current value output by the current sensor is multiplied by the corresponding temperature coefficient to obtain the compensated current value;
and S7, comparing the compensated current value with a current value output by a standard ammeter by the error calculation device 7, subtracting the current value output by the standard ammeter from the compensated current value to obtain a measurement error of the current sensor, and storing and displaying the measurement error.
In some embodiments of the present application, the dc current source is an adjustable current source, and after the temperature coefficient table is obtained, steps S5 to S7 may be repeated based on different output currents of the dc current source, so as to obtain and store measurement errors at each current, thereby completing calibration of the current sensor. Similarly, in other embodiments of the present application, when one current sensor performs calibration for the second time or more, and current sensors of the same type perform calibration, or when the same current sensor performs calibration in multiple specific temperature ranges, the steps S5 to S7 are also performed on the basis of the obtained temperature coefficient table, so that the required measurement error can be obtained and stored, thereby completing the corresponding calibration operation.
The working principle of the invention is as follows: the invention adopts the parallel superconducting wire strips to increase the conductive current of the line, which is beneficial to reducing the volume of the wire, reducing the rated power of a standard direct current source and reducing the technical requirement and cost on the current source under the condition of meeting the current requirement; the invention can carry out temperature compensation on the output value of the current sensor under different temperatures, and then carry out calibration based on the compensated output value, thereby being beneficial to ensuring the accuracy of the measurement of the current sensor in a specific temperature interval.
Finally, it is to be understood that the above description illustrates and describes preferred embodiments of the invention, but as before, it is to be understood that the invention is not limited to the precise forms disclosed herein, and that it is not to be considered as excluding other embodiments, but is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed above, or as determined by the skilled in the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. A temperature compensation based current sensor calibration system, comprising: the device comprises a direct current source (4), a standard ammeter (5), an error calculation device (7), a Dewar, a current sensor to be measured and a temperature sensor (8) for measuring the field temperature;
a first power supply end (1) is arranged on the outer wall of the top of the Dewar, a second power supply end (2) is arranged on the outer wall of the bottom of the Dewar, a plurality of superconducting wire strips (3) connected in parallel are arranged in the Dewar, the first end of each superconducting wire strip (3) penetrates through the top of the Dewar to be connected with the first power supply end (1), and the second end of each superconducting wire strip (3) penetrates through the bottom of the Dewar to be connected with the second power supply end (2); the first power supply end (1) is connected with the negative electrode of the direct current source (4) through a standard ammeter (5), and the second power supply end (2) is connected with the positive electrode of the direct current source (4); the output ends of the standard ammeters (5) are connected with an error calculation device (7);
a magnetic flux measuring loop (6) of the current sensor is sleeved on the Dewar, and the plane of the magnetic flux measuring loop (6) of the current sensor is intersected with the superconducting wire strip (3); the output ends of the current sensor and the temperature sensor (8) are connected with the error calculation device (7);
the error calculation device (7) is used for acquiring current values output by the current sensors at different temperatures when the output of the direct current source is kept unchanged, calculating the ratio of the current value output by the current sensor at a reference temperature to the current value output by the current sensor at different temperatures, obtaining temperature coefficients of the current values at different temperatures and generating a temperature coefficient table; when the current sensor is actually calibrated, temperature compensation is carried out on the current value output by the current sensor according to the temperature coefficient table and the temperature acquired by the current temperature sensor; and comparing the compensated current value with the current value output by the standard ammeter, calculating the measurement error of the current sensor, and accordingly completing the calibration of the current sensor.
2. The temperature compensation based current sensor calibration system of claim 1, wherein: the current sensor is a non-contact direct current sensor.
3. The system of claim 1, wherein the current sensor calibration system based on temperature compensation comprises: the error calculation device (7) comprises a storage unit, a display unit and a data processing unit; the data processing unit is respectively connected with the output ends of the standard ammeter (5), the temperature sensor (8) and the current sensor, and the data processing unit is respectively connected with the storage unit and the display unit;
the data processing unit is used for acquiring current values output by the current sensors at different temperatures when the output of the direct current source is kept unchanged, calculating the ratio of the current value output by the current sensor at a reference temperature to the current value output by the current sensor at different temperatures, obtaining temperature coefficients of the current values at different temperatures and generating a temperature coefficient table; when the current sensor is actually calibrated, temperature compensation is carried out on the current value output by the current sensor according to the temperature coefficient table and the temperature acquired by the current temperature sensor; comparing the compensated current value with a current value output by a standard ammeter, calculating the measurement error of the current sensor, and accordingly completing the calibration of the current sensor;
the storage unit is used for storing the temperature coefficient table and the measurement error of the current sensor;
and the display unit is used for displaying the temperature coefficient table and the measurement error of the current sensor.
4. The temperature compensation based current sensor calibration system of claim 1, wherein: the first power supply end (1) and the second power supply end (2) are both metal electrodes; first power supply end (1) passes through the fix with screw in the top outer wall of dewar, second power supply end (2) passes through the fix with screw in the bottom outer wall of dewar to convenient to dismantle.
5. The temperature compensation based current sensor calibration system of claim 1, wherein: the temperature sensor (8) is arranged in the current sensor to be measured or near the current sensor to be measured.
6. A method for calibrating a current sensor based on temperature compensation, using the calibration system of any one of claims 1~4, comprising: the method comprises the following steps:
s1, arranging the calibration system in a closed test space, and enabling a standard ammeter to be always at a reference temperature in a single constant-temperature small space in the space;
s2, the current sensor and the temperature sensor (8) transmit the acquired information to an error calculation device;
s3, adjusting the temperature of the closed test space, keeping the output of the direct current source unchanged, and repeating the step S2 at different temperatures to obtain current values output by the current sensors at different temperatures;
s4, an error calculation device (7) calculates the ratio of the current value output by the current sensor at the reference temperature to the current value output by the current sensor at different temperatures to obtain the temperature coefficients of the current values at different temperatures and generate a temperature coefficient table;
s5, when the test space is in a preset specific temperature range, the current sensor starts to be calibrated, and in the calibration process, the standard ammeter (5), the current sensor and the temperature sensor (8) transmit acquired information to the error calculation device (7)
S6, an error calculation device (7) finds a temperature coefficient at the temperature in the temperature coefficient table according to the temperature collected by the current temperature sensor, and compensates a current value output by the current sensor by using the temperature coefficient;
and S7, comparing the compensated current value with a current value output by a standard ammeter by an error calculation device (7), calculating the measurement error of the current sensor, and storing and displaying the measurement error.
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| CN112748387B (en) * | 2021-01-29 | 2022-06-14 | 河北大学 | Current detection method, device and system based on optical fiber current sensor |
| CN112946554B (en) * | 2021-02-07 | 2022-11-11 | 江苏奥力威传感高科股份有限公司 | Calibration method of current sensor |
| CN113985337B (en) * | 2021-12-30 | 2022-05-13 | 宁波均胜新能源研究院有限公司 | Calibration method, device and system of resistance type current sensor and calibration method |
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