Journal
MEASUREMENT
Volume 155, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.measurement.2020.107535
Keywords
Current transformer (CT); Power system measurements; Synchrophasor measurement; Phasor measurement unit (PMU); Amplitude modulation; Phase modulation; Frequency modulation
Funding
- EMPIR - European Metrology Programme for Innovation and Research (EMPIR) within EURAMET, Germany [17IND06]
- EMPIR within European Union [17IND06]
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Instrument Transformers (ITs) are essential devices for all the measurement tasks, f.i. metering, protection and diagnostics, in electricity grids, since they scale voltage and current down to levels compatible with measuring instruments. At the input of Power Quality (PQ) instruments and Phasor Measurement Units (PMUs), inductive voltage and current transformers (VTs and CTs) are still the most used ITs, even if, their performance in presence of disturbances is not fully assessed. This paper analyses the impact of the inductive CTs on the measurement of fundamental synchrophasors, by a PMU, in presence of a particular class of disturbances, the undesired modulations on current signals. Experimental tests, on two different CTs, show that there are critical situations, where, even compensating CT systematic ratio and phase errors, 1) CT exceeds its accuracy class limit and 2) considering the sole contribution of CT, PMU performance stays very close to the error limits of the standards. (C) 2020 The Author(s). Published by Elsevier Ltd.
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