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A Simple Method for Compensating Harmonic Distortion in Current Transformers: Experimental Validation.

Christian Laurano¹, Sergio Toscani², Michele Zanoni¹

¹Ricerca sul Sistema Energetico S.p.A., via Rubattino 54, 20134 Milano, Italy.

Sensors (Basel, Switzerland)

|April 30, 2021

Summary

This summary is machine-generated.

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Sensors (Basel, Switzerland)·2024

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This study introduces a signal processing technique to correct nonlinearities in current transformers (CTs), improving harmonic measurement accuracy. The method effectively reduces errors in low-order harmonic monitoring for power systems.

Area of Science:

Electrical Engineering
Signal Processing

Background:

Conventional current transformers (CTs) exhibit nonlinearities due to ferromagnetic cores, impacting relay operations and harmonic measurements.
Core saturation during overcurrents and harmonic distortion during normal operation affect measurement accuracy.

Purpose of the Study:

To implement and validate a signal processing technique for compensating CT nonlinearities.
To improve the accuracy of harmonic measurements in power systems.

Main Methods:

Development of a computationally simple signal processing technique.
Validation through numerical simulations and experimental testing on inductive CTs.

Main Results:

Demonstrated noticeable reduction in errors for low-order harmonics across various primary current amplitudes.

Keywords:

calibration current measurement current transformers error compensation frequency domain analysis frequency response harmonic distortion instrument transformers measurement uncertainty nonlinear systems power system harmonics

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The black-box approach proved effective for different current transducer types.

Conclusions:

The proposed method offers high-accuracy harmonic monitoring in power systems.
Suitable for power quality analyzers and merging units, enabling advanced power quality management and fault location.