6533b839fe1ef96bd12a5c86

RESEARCH PRODUCT

Compensation of Nonlinearity of Voltage and Current Instrument Transformers

Domenico GiordanoValentina CosentinoMario LuisoDario Di CaraGiovanni TineGabriella CrottiCarmine LandiDaniele GalloMohammad ModarresAntonio Delle FemineAntonio Cataliotti

subject

uncertainty.Materials sciencepower system measurementAcousticsHarmonics020208 electrical & electronic engineeringPhasorHarmonicinstrument transformers (ITs)02 engineering and technologypower qualitySignalCurrent transformerCompensation (engineering)Harmonic analysisSine waveDistortion0202 electrical engineering electronic engineering information engineeringHarmonicElectrical and Electronic EngineeringuncertaintySettore ING-INF/07 - Misure Elettriche E ElettronicheInstrumentation

description

This paper aims at characterizing and improving the metrological performances of current and voltage instrument transformers (CTs and VTs) in harmonic measurements in the power system. A theoretical analysis is carried out to demonstrate that, due to the iron core nonlinearity, CT and VT output signal is distorted even when the input signal is a pure sine wave. Starting from this analysis, a new method for CT and VT characterization and compensation is proposed. In a first step, they are characterized in sinusoidal conditions and the harmonic phasors of the distorted output are measured; in the second step, these phasors are used to compensate the harmonic phasors measured in normal operating conditions, which are typically distorted. The proposed characterization and compensation techniques are called SINusoidal characterization for DIstortion COMPensation (SINDICOMP). Several experimental tests, using high-accuracy calibration setups, have been performed to verify the proposed methods. The experimental results showed that the SINDICOMP technique assures a significant improvement of CT and VT metrological performances in harmonic measurements.

yearjournalcountryeditionlanguage
2019-05-01IEEE Transactions on Instrumentation and Measurement
https://doi.org/10.1109/tim.2018.2880060