Abstract
In the context of modern power systems, where there are lots of non-linear loads and generators based on switching power electronics, the accurate measurement of voltage and current harmonics is a key task for the knowledge of the actual state of the network. Voltage and current transducers play a crucial role since they are always the first part of the measurement chain. Currently, classical voltage and current instrument transformers are the most installed transducers, but their performance not always is fully characterized in the presence of distorted waveforms. Therefore, in this paper a calibration setup for the accurate characterization of current transformers with distorted waveforms is presented. System implementation and characterization is presented; then it is employed for the evaluation of the performance of a commercial current transformer in distorted conditions.
Highlights
Due to the massive and ongoing new expansion of non-linear devices the monitoring of distorted voltages and currents is a crucial issue in today’s power system ([1])
In the context of modern power systems, where there are lots of non-linear loads and generators based on switching power electronics, the accurate measurement of voltage and current harmonics is a key task for the knowledge of the actual state of the network
The accuracy of these measurement setups is strongly linked to the metrological performance of current and voltage instrument transformers (CTs and VTs) which are essential elements of the measurement chain
Summary
Due to the massive and ongoing new expansion of non-linear devices (such as rectifier, distributed generators inverters, switching power devices) the monitoring of distorted voltages and currents is a crucial issue in today’s power system ([1]). Proper measurement setups ([2]) are needed to accurately fulfill the new tasks required by this smart grid context, like power quality, synchrophasors, harmonic impedance and system state estimation The accuracy of these measurement setups is strongly linked to the metrological performance of current and voltage instrument transformers (CTs and VTs) which are essential elements of the measurement chain. Various papers in scientific literature ([3]-[5]) have shown that CTs and VTs have different behaviors when their input is sinusoidal or it is a distorted waveform This is due to an intrinsic non-linear behavior, which does not allow to use the superposition principle for their characterization. The amplifier and the comparator are remotely controlled, respectively through IEEE 488.2 and Ethernet, by a PXI controller running the calibration software, developed in LabVIEW
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