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Voltage Sags and Interruptions 84 Three
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typical overhead line fused cutout The fundamental purpose of fuses is to operate on permanent faults and isolate (sectionalize) the faulted section from the sound portion of the feeder They are positioned so that the smallest practical section of the feeder is disturbed Fuses detect overcurrent by melting the fuse element, which generally is made of a metal such as tin or silver This initiates some sort of arcing action that will lead to the interruption of the current There are two basic kinds of fuse technologies used in power systems: 1 Expulsion fuses (as in Fig 333) 2 Current-limiting fuses (see Sec 3711) The essential difference between the two is the way the arc is quenched This also gives the fuses different power quality characteristics An explusion fuse creates an arc inside a tube with an ablative coating This creates high-pressure gases that expel the arc plasma and fuse remnants out the bottom of the cutout, often with a loud report similar to a firearm This cools the arc such that it will not reignite after the alternating current naturally goes through zero This can be as short as one-half cycle for high currents to several cycles for low fault currents This determines the duration of the voltage sag observed at loads An expulsion fuse is considerably less expensive than a currentlimiting fuse A current-limiting fuse dissipates the energy in the arc in a closed environment, typically by melting a special sand within an insulating tube This process actually quenches the arc very quickly, forcing the
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Typical utility fused cutout with expulsion fuse (Courtesy of Cooper Power Systems)
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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Voltage Sags and Interruptions Voltage Sags and Interruptions 85
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current to zero before that would naturally occur This can have some beneficial impacts on the voltage sag characteristics (see Fig 345) Because it is based on a piece of metal that must accumulate heat until it reaches its melting temperature, it takes a fuse different amounts of time to operate at different levels of fault current The time decreases as the current level increases, giving a fuse its distinctive inverse time-current characteristic (TCC), as shown in Fig 334 To achieve full-range coordination with fuses, all other overcurrent protective devices in the distribution system must adopt this same basic shape The fuse TCC is typically given as a band between two curves as shown The leftmost edge represents the minimum melting time, while the rightmost edge represents the maximum clearing time for different current levels Some aspects of coordinating with the fuse characteristic relevant to power quality are as follows: 1 If the utility employs fuse saving on temporary faults, the coordinating fault interrupter must have a TCC to the left of the minimum melting curve 2 For a permanent fault, the coordinating device must have a TCC to the right of the clearing curve to allow the fuse to melt and clear first Otherwise, many other customers will be interrupted
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The inverse time-current characteristic of a fuse that dictates the shape of the characteristic of all other devices for series overcurrent coordination
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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Voltage Sags and Interruptions 86 Three
3 Repeated fault currents, inrush currents from reclosing, and lightning stroke currents can damage the fuse element, generally shifting the TCC to the left This will result in inadvertent interruptions of customers downline from the fuse 4 For high current values with operating time less than 01 s, it is difficult to guarantee that an upline mechanical fault interrupter will be able to save the fuse
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