An Electronic Current Transformer Calibration System Based on Standard Rogowski Coils

Abstract

The invention discloses an electronic current transformer calibration system based on a standard Rogowski coil. The standard Rogowski coil is used as a standard source, and the output of the standard signal is directly digitized, and no additional analog-to-digital conversion is required in the part of the electronic transformer calibrator. The module can realize the measurement of the error and phase difference data of the primary current signal. There is no iron core inside the coil, which is not affected by ferromagnetic resonance and magnetic saturation effects, and has a wide dynamic range and a wide measurement range; the dual-configuration adjustable acquisition unit adopts dual configurations, and the first-level configuration coefficient K0 can ensure that different electronic circuits are processing the same When simulating a signal, a constant digital signal can be obtained, that is, to ensure the consistency of different electronic circuits, which is suitable for mass production, and there is no need to change the second-level configuration coefficient Kn after replacing the electronic circuit in case of failure, adaptive calibration; the second-level configuration The coefficient KX realizes the wide-range measurement of different primary currents and ensures the high-precision requirements of different gears.

Description

technical field [0001] The invention belongs to the field of calibration of power system metering equipment, in particular to an electronic current transformer calibration system based on a standard Rogowski coil. Background technique [0002] With the development of smart grids, electronic current transformers, as key equipment in smart substations, have been more and more widely used. Their stability and reliability are related to the healthy, rapid and steady development of smart grids. more and more attention in the industry. [0003] Electronic current transformers mostly use new sensors to transmit and transform primary current signals, such as Rogowski coils, LPCT, magneto-optical glass, and polarization-maintaining optical fibers. At present, the accuracy verification of electronic current transformers is based on the traditional method, that is, the traditional standard current transformer with iron core is used as the standard source, and the iron core winding is ...

AI Technical Summary

Problems solved by technology

This calibration method using iron-core standard current transformers has problems such as ferromagnetic resonance and ferromagnetic saturation defects, difficulty in increasing capacity, cumbersome secondary wiring, and secondary open-circuit high-voltage dangers.

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