Voltage Dip Immunity of Equipment and Installations

Voltage dips (also known as “voltage sags”) are short-duration reductions in voltage magnitude. Their duration is typically between a few cycles of the power-system frequency and a few seconds. The interest in voltage dips is mainly due to their impact on end-user equipment. Industrial processes may malfunction or shut down due to a voltage dip resulting in significant financial losses.

Voltage dips are due to short-duration increases in current magnitude, whereas voltage dips due to short circuits and earth faults are of most concern for customers.

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European Power Quality Survey Report

Since the end of the 1990s the European Copper Institute [ECI] has been concerned about the impact experienced by commerce and industry of the changing nature of the energy demands organisations face as a result of equipment technological advances, the increasing need o build in resilience into their electrical power installations and the presumed mounting costs of not taking either adequate preventative or reactive action to accommodate the changes.

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