Micro current sensor precision calibration method and device, computer equipment and storage medium

Abstract

The invention relates to a micro current sensor precision calibration method and device, computer equipment and a storage medium. The method comprises the following steps: processing a first measurement distance and a second measurement distance of three TMR chips and each magnetic induction intensity value measured by each TMR chip for an electrified current-carrying wire located at a preset position by adopting a particle swarm model to obtain an optimal solution, and confirming the optimal solution as a first distance calibration value and a second distance calibration value; and based on the first distance calibration value and the second distance calibration value, carrying out current measurement of the micro current sensor to complete sensor precision calibration. Therefore, an accurate data source is provided for the current measurement of the miniature current sensor, the measurement error of the miniature current sensor is reduced, and the accuracy of the current measurementis improved.

Description

technical field [0001] The present application relates to the technical field of electric power measurement, in particular to a micro current sensor precision calibration method, device, computer equipment and storage medium. Background technique [0002] Current measurement plays an extremely important role in the power industry, providing power systems with the information necessary for metering, control and relay protection. At present, the current measurement of the power system still mainly relies on the traditional electromagnetic current transformer. The disadvantage of this kind of sensor is that it is bulky and expensive. It must prevent the saturation of the iron core. It can only measure AC signals, and the frequency is very low, so it cannot measure high frequency. current. [0003] With the continuous development of the power grid in the direction of intelligence and digitization, the demand for research and development of miniaturization, smart books, and low-...

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Problems solved by technology

[0004] Compared with other magnetoresistance chips, tunnel magnetoresistance (TMR) chips (hereinafter referred to as "TMR chips") have unique advantages such as large magnetoresistance effect and high magnetic field sensitivity, and are widely used in miniature smart current sensors; Among them, the inventor found that there are at least the following problems in the traditional technology: the traditional TMR chip can measure the magnetic induction intensity in the single-axis or three-axis direction, and the sensor using three single-axis TMR chips to measure the current has been developed, and it has begun in the power grid application, but due to manufacturing and measurement errors, there is often a certain error between the actual distance between TMR chips and the design distance, and the design distance between TMR chips is generally small (millimeter level), making the relative error large, There is also a large error in the current measurement value, which affects the measurement accuracy of the sensor

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