VOLTAGE SAGS - EFFECTS, MITIGATION AND PREDICTION

Customers all over the world experience problems due to voltage sags. Computers, industrial control systems, and adjustable-speed drives are especially notorious for their sensitivity. Tripping of high-power ad justable-speed drives is probably the main voltage sag problem. The nu mber of trips depends strongly on the equipment sensitivity. Predictio n methods are needed to quantify this aspect of the quality of the sup ply. From utility and manufacturer's data, a customer can assess the c ompatibility between a piece of equipment and the electricity supply.