Applying current-limiting fuses to improve power quality and safety

This paper describes power quality and safety benefits that can be achieved by applying current-limiting fuses (CLFs) instead of expulsion fuses. CLFs can improve power quality by reducing voltage dip magnitude and duration during faults. Safety is improved because CLFs reduce the risk of fire and injury by eliminating the flame, violence, and noise associated with expulsion fuse operation. This paper compares expulsion and CLF fuse operations using Alternative Transient Program (ATP) simulations, laboratory tests, and field experiences. The proper application of CLFs to improve power quality on the Carolina Power and Light (CP&L) system and other relevant field experiences are described.