OLIVEIRA, P. V. B.; http://lattes.cnpq.br/9946288244103459; OLIVEIRA, Paulo Vinicius Bezerra de.
Abstract:
The infuence of the data acquisition system on the performance of one- and two-ended
fault location techniques and on distance protection is evaluated. Basically, one Coupling
Capacitor Voltage Transformers (CCVT), three anti-aliasing Ąlters, and three analog-to-
digital converters (ADC) with 8, 16, and 32 bits were taken into account. Several fault
scenarios are performed in a 230 kV power system modelled in the Alternative Transients
Program (ATP). After each simulation, the data generated were recorded and subsequen-
tly evaluated in MATLAB. Routines. In the fault location analyses, the fault point was
estimated using as input data to the locator algorithms the voltage and current signals
from the primary, secondary, Ąltered secondary, and the signals sampled by the ADC, and
the relative errors are computed. Regarding the distance protection, the apparent impe-
dance trajectory was plotted, considering the diferent signals from the data acquisition
system, over the mho relay characteristics. From the obtained results, it was veriĄed that
the estimated fault locations and the impedance trajectory are directly afected by the
CCVT and anti-aliasing Ąlters transient responses, and the error introduced by the ADC.
Furthermore, it is possible to conclude that ADC with 16 bits or more achieved identical
performances for the evaluated protection functions.