Quantifying the potential impacts of disturbances on power system protection

The performance of power system protection plays a vital role in system security and reliability. The presence of disturbances may affect the operation of protective relays, and thus endanger the security and reliability of the supply. The effect of disturbances on protection operation increases when faster and more sensitive algorithms are used. In this paper, two methods are presented to quantify the potential impact of measured disturbances on relay operation. Both methods are applied to a number of disturbances.