This paper describes power quality and safety The distribution fault currents on the Florida system are higher benefits that can be achieved by applying current-limiting than those on the Carolina Power and Light system. Fault fuses (CLFs) instead of expulsion fuses. CLFs can improve current level is very important when determining how well power quality by reducing voltage dip magnitude and duration CLFs will support system voltage under fault conditions. If during faults. Safety is improved because CLFs reduce the the fault current is too low, a CLF may not operate in the risk of fire and injury by eliminating the flame, violence, and current limiting mode and instead wait for a current zero to noise associated with expulsion fuse operation. This paper clear a fault, which is how an expulsion fuse operates. compares expulsion and CLF fuse operations using Alternative Transient Program (ATP) simulations, laboratory tests, and 11. FUSE OPERATION THEORY EXPULSION FUSES are zero-awaiting devices which wait Power and Light (cp&L) for the current through the fuse to pass through zero before extinguishing the contained arc and clearing the circuit (Fig. field experiences. The proper application of CLFs to improve power On the system and other relevant field experiences are described.
This paper presents a comparative analysis of the effects of expulsion and current-lrmiting fuse (CLF) operations in distribution systems on power quality and system protection. This analysis included field tests of both types of fuses on a distribution system in Florida. To further analyze fuse effects on the voltage dip duration and spread of the overvoltages created during the fuse operations throughout the system, computer simulations were also performed. Unique digital fuse models were developed for use with the EMTP/ATP program. This paper shows that CLFs improve power quality by supporting system voltage during faults, reducing the voltage dip duration, and do not affect load operation. Additionally, CLFs reduce the fault letthrough I't.Computer simulations are included with the field testing in order to demonstrate that computer simulations can be used to predict the effects of CLF operations at any location in the system. The CLF models presented in this paper were developed for use with the Alternative Transients Program (ATP) and the Electromagnetic Transients Program (EMTP) which are widely used for power system analysis. Developed models can accurately simulate CLF operations and the resultant system voltages. The first section of this paper presents the CLF fuse modeling method. Models were verified by comparing simulation results to the laboratory tests. Fuse testing is included in section two. This section includes a comparative analysis of expulsion and current limiting fuse operations on distribution systems. Conclusions are given at the end of this paper.
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