A method and system for dynamic compensation of metrological error of an intelligent measuring switch

CN121741616BActive Publication Date: 2026-06-26LINFEN FENNENG POWER TECH TESTING CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
LINFEN FENNENG POWER TECH TESTING CO LTD
Filing Date
2026-02-27
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing intelligent measurement switches cannot meet the requirements for high-precision dynamic measurement due to the measurement error caused by the magnetic saturation of the current transformer and the time delay of the filter circuit group when the load is rapidly and dynamically switched from 100A to 250A.

Method used

By constructing a dynamic compensation mechanism with phase delay compensation and high-order current correction, the hardware timer triggering mechanism of the microcontroller is used to realize concurrent sampling of voltage and current channels. Combined with the exponential function model and real-time temperature sensing, the phase delay compensation time is calculated and high-order current correction is performed to ensure the accuracy of the signal.

Benefits of technology

During dynamic load switching, the accuracy of active power calculation is improved, the inaccuracy of power metering data is reduced, and the power system's requirements for real-time monitoring of power quality and accurate billing are met.

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Abstract

The present application relates to the technical field of electric variable data compensation, and particularly relates to a kind of dynamic compensation method and system for measurement error of intelligent measurement switch.The method comprises the following steps: based on the original instantaneous current of each sampling point, the equivalent excitation inductance of current transformer, the secondary winding resistance, the resistance value of sampling resistor, the critical current value of magnetic circuit saturation, the phase delay compensation time of each sampling point is calculated;the original instantaneous current is corrected to obtain the real current value of sampling point;based on the original instantaneous voltage of sampling point in the measurement period, the real current value and the phase delay compensation time, the active power of the measurement period is calculated, to realize dynamic compensation of measurement error, which can effectively improve the accuracy of active power calculation of intelligent measurement switch in the process of load dynamic switching.
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