Journal
SENSORS
Volume 22, Issue 1, Pages -Publisher
MDPI
DOI: 10.3390/s22010397
Keywords
low-power instrument transformer; Rogowski coil; position; burden; proximity; accuracy; harmonic; power quality
Funding
- EMPIR program [19NRM05 IT4PQ]
- European Union's Horizon 2020 research and innovation program
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Power quality evaluation assesses the deviation of power network parameters from ideal conditions. This work presents a measurement setup and specific tests for a commonly used type of low-power current transformer. The accuracy performance of the transformer was evaluated under the influence of other factors.
Power quality evaluation is the process of assessing the actual power network parameters with respect to the ideal conditions. However, several new assets and devices among the grid include mining the voltage and current quality. For example, the power converters needed for renewable energy sources' connection to the grid, electric vehicles, etc., are some of the main sources of disturbances that inject high-frequency components into the grid. Consequently, instrument transformers (ITs) should be capable of measuring distorted currents and voltages with the same level of accuracy guaranteed for the ideal frequency (50-60 Hz). This is not a simple task if one considers that several other influence quantities endlessly act on the ITs. To this purpose, considering the lack of a standard, this work presents a measurement setup and specific tests for testing a commonly used type of low-power current transformer, the Rogowski coil (RC). In particular, the accuracy performance (ratio error and phase displacement) of the RCs was evaluated when measuring distorted signals while other influence quantities affected the RCs. Such quantities included positioning, burden, and magnetic field. The results indicate which quantities (or combination of them) have the greatest effect on the RC's accuracy performance.
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