Current Harmonics Measurement by Means of Current Transformers

This paper analyzes the accuracy of current transformers (CT) when excited with nonsinusoidal currents. It uses a nonlinear model that accounts for the minor hysteresis loop of the core. It was concluded that instrument transformers with accuracy class 0.6 or better provide reasonably accurate measu...

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Bibliographic Details
Published in:IEEE transactions on power delivery 2007-07, Vol.22 (3), p.1318-1325
Main Authors: Emanuel, A.E., Orr, J.A.
Format: Article
Language:English
Subjects:
Accuracy
Applied sciences
Current measurement
Current transformers
Disturbances. Regulation. Protection
Electrical engineering. Electrical power engineering
Electrical power engineering
Error analysis
Exact sciences and technology
Fluid flow measurement
Harmonics
Hysteresis
Hysteresis loops
Instrument transformers
instrumentation
measurements
Nonlinearity
Operation. Load control. Reliability
Permissible error
Phase measurement
Pollution measurement
Power flow
Power measurement
Power networks and lines
Power system harmonics
powers
Theory. Simulation
Transformer cores
Transformers
Transformers and inductors
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Description
Summary:This paper analyzes the accuracy of current transformers (CT) when excited with nonsinusoidal currents. It uses a nonlinear model that accounts for the minor hysteresis loop of the core. It was concluded that instrument transformers with accuracy class 0.6 or better provide reasonably accurate measurements of current harmonics magnitudes, however the phase angle error may lead to unacceptable errors when the current transformers are used to measure active powers. If such measurements are used to determine the power flow direction, i.e., if a load or consumer pollutes or is polluted, even high accuracy class CTs may yield unsatisfactory results.
ISSN:0885-8977
1937-4208
DOI:10.1109/TPWRD.2007.900108