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Voltage Sags and Interruptions Voltage Sags and Interruptions 103
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interruption process without rupturing The element melts in many places simultaneously and, with the aid of the melting sand, very quickly builds up a voltage drop that opposes the flow of current The current is forced to zero in about one-fourth of a cycle The main purpose of current-limiting fuses is to prevent damage due to excessive fault current They have the beneficial side effect with respect to power quality that the voltage sag resulting from the fault is very brief Figure 345 shows typical voltage and current waveforms from a current-limiting fuse operation during a single-line-to-ground fault The voltage drops immediately to about 40 percent because of the fault, but shortly recovers and overshoots to about 140 percent as the peak arc voltage develops in the fuse to cut off current flow Note that the current waveform is clipped by the instrumentation The voltage sag is so short that not many industrial processes will be adversely affected Therefore, one proposed practice is to install current-limiting fuses on each lateral branch in the high fault current region near the substation to reduce the number of sags that affect industrial processes When current-limiting fuses were first installed on utility systems in great numbers, there was the fear that the peak arc voltage transient, which exceeds system voltage, would cause damage to arresters and to insulation in the system This has not proven to be a significant problem The overvoltage is on the same order as capacitor-switching transient overvoltages, which occur several times a day on most utility systems without serious consequences
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3712 Adaptive relaying
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Adaptive relaying is the practice of changing the relaying characteristics of the overcurrent protective device to suit the present system conditions One relevant thing that is currently being done with adaptive relaying is the enabling and disabling of fast tripping of breakers in response to weather conditions This is generally done through a radio or telecommunications link to the utility control center It could also be done with local devices that have the ability to detect the presence of nearby lightning or rain If a storm is approaching, fast tripping is enabled to save the fuses from the anticipated high incidence of temporary faults End users are more understanding and less likely to complain about interruptions during storms At other times, fast tripping is disabled and the fuses are allowed to blow This does not mean there will be no temporary faults without storms Animals can climb electrical structures at any time and cause a fault Vegetation growth may be sufficient to cause faults However,
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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 104 Three
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Phase A Voltage kV 30 20 10 0 10 20 30 0 20 40 Time, ms 60 80 100
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A 40 20 0 20 40 60 0 20 40 Time, ms 60
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Phase A Current
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Typical current-limiting fuse operation showing brief sag followed by peak arc voltage when the fuse clears
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the public is generally much less understanding about an interruption on a clear day
3713 Ignoring third-harmonic currents
The level of third-harmonic currents has been increasing due to the increase in the numbers of computers and other types of electronic loads on the system The residual current (sum of the three-phase currents) on many feeders contains as much third harmonic as it does fundamental frequency A common case is to find each of the phase currents to be moderately distorted with a THD of 7 to 8 percent, consisting primarily of the third harmonic The third-harmonic currents sum directly in the neutral so that the third harmonic is 20 to 25 percent of the phase current, which is often as large, or larger, than the fundamental frequency current in the neutral (see Chaps 5 and 6)
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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