This paper summarizes the results from a number of different voltage sag investigations. These investigations involve characterizing the voltage sag performance at a customer facility and evaluating equipment sensitivity to different voltage sag magnitudes and durations. Possible solutions to voltage sag sensitivity problems are also described.
Absttract:A simple yet pow& algorithm to estimate the distance to a single lineteground fault on a distriition feeder is proposed. The algorithm is implemented in a power mtmitor insbnnnent and the estimation of distance is made within the instrument itself. n e algorithm is designed to work where the only available data to the instrument are a single point " e n t taker1 at the substation and the positive and zetosequence impedance of the pxima~~ feeder. The single point m -consists of three-phase voltage and current waveforms. Netwmk topology data are not available to the algorithm. The new technique accommodates computational power and data c " t s * while maintaining adequate accuracy of the measurements.
Several papers have been written on the response of directly connected induction motors or adjustable speed drive (ASD) connected motors to unbalanced and balanced voltage sags caused by faults on the power system. This paper will detail the interaction between the motors and drives and the supplying distribution system both during and after the voltage sag. In addition, the system effect of transferring the loads during the sag to an alternate feed with solid-state switching is evaluated. The Electro-Magnetic Transients Program (EMTP) was used for the analysis.
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