An error correction method and device for a current measuring device based on a shunt
A current measurement device and error correction technology, applied in the direction of measurement device, measurement of electrical variables, instruments, etc., can solve the problems of lack of solution, measurement error, shunt resistance change error, etc., and achieve the effect of improving measurement accuracy
Active Publication Date: 2019-12-24
山东联合电力产业发展有限公司
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[0003] During the full-scale data measurement process of these shunt-based products for current measurement, the measurement accuracy will be affected by the following factors: 1) the resistance error caused by the shunt itself and the process of assembly and welding; 2) the shunt Resistance change error at different temperatures; 3) Resistance change error of the shunt under different load current conditions
[0004] To sum up, in the prior art, there is still no effective solution to the problem of measurement errors in current measurement devices based on shunts.
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[0034] It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
[0035] It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combinations thereof.
[0036] As introduced in the background technology, in the prior art, there are measurement errors and uncorrecta...
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The invention discloses an error correcting method and device of a shunt-based current measuring device. The method includes measuring the actual resistance of the shunt output loop of the current measurement device, and comparing the actual resistance with the rated resistance of the shunt to obtain a shunt resistance correcting coefficient; measuring the actual voltage of the shunt output loop of the current measuring device, and obtaining the load current of the shunt output loop; dividing the load current into a plurality of load current grades according to the size, aiming at each load current grade, drawing a shunt resistance change curve affected by temperature; according to the shunt resistance change curve, obtaining a comprehensive correction coefficient matrix table of each loadcurrent grade in different temperature states; and correcting the current sampling value by adopting a comprehensive compensation algorithm according to the temperature value T and the effective value of the load current. The current measurement value obtained by the current measurement device is accurately corrected, and the measuring accuracy of the current measuring device based on the shunt is improved.
Description
technical field [0001] The invention relates to the field of current measurement based on a shunt, in particular to an error correction method and device for a current measurement device based on a shunt. Background technique [0002] There are many ways to measure current by using electronic current transformers in the smart grid, including 1) the principle of Rogowski coils; 2) the principle of all-fiber rings; 3) shunts. In addition, there are many products that use shunts for current measurement, such as DC charging current measurement in DC charging piles. [0003] During the full-scale data measurement process of these shunt-based products for current measurement, the measurement accuracy will be affected by the following factors: 1) the resistance error caused by the shunt itself and the process of assembly and welding; 2) the shunt The resistance change error occurred at different temperatures; 3) The resistance change error of the shunt under different load current...
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IPC IPC(8): G01R35/00
CPCG01R35/00
Inventor 胡明峰孙方伟杨婷婷田广昌高磊
Owner 山东联合电力产业发展有限公司