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Fault locations on the utility power system
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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 45
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sion system and the distribution system will depend on the specific characteristics of the systems (underground versus overhead distribution, lightning flash densities, overhead exposure, etc) and the sensitivity of the equipment to voltage sags Figure 32 shows an example of the breakdown of the events that caused equipment misoperation for one industrial customer Note that faults on the customer feeder only accounted for 23 percent of the events that resulted in equipment misoperation This illustrates the importance of understanding the voltage sag performance of the system and the equipment sensitivity to these events Figures 33 and 34 show an interesting utility fault event recorded for an Electric Power Research Institute research project 4,11 by 8010 PQNode* instruments at two locations in the power system The top chart in each of the figures is the rms voltage variation with time, and the bottom chart is the first 175 ms of the actual waveform Figure 33 shows the characteristic measured at a customer location on an unfaulted part of the feeder Figure 34 shows the momentary interruption (actually two separate interruptions) observed downline from the fault The interrupting device in this case was a line recloser that was able to interrupt the fault very quickly in about 25 cycles This device can have a variety of settings In this case, it was set for two fast operations and two delayed operations Figure 33 shows only the brief sag to 65 percent voltage for the first fast operation There was an identical sag for the second operation While this is very brief sag that is virtually unnoticeable by observing lighting blinks, many industrial processes would have shut down
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Faults on Transmission System 31% Faults on Own Circuit 23%
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Faults on Parallel Circuits 46% Figure 32 Example of fault locations that caused misoperation of sensitive production equipment at an industrial facility (the example system had multiple overhead distribution feeders and an extensive overhead transmission system supplying the substation) *PQNode is a registered trademark of Dranetz-BMI, Edison, NJ
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Voltage Sags and Interruptions 46 Three
Phase B Voltage RMS Variation Voltage (%) 120 110 100 90 80 70 60 0 Voltage (%) 150 100 50 0 50 100 0 25 50 75 100 Time (ms)
PQNode Local Trigger
Duration 0050 s Min 6580 Ave 9010 Max 1005
015 Time (s)
Voltage sag due to a short-circuit fault on a parallel utility feeder
Figure 34 clearly shows the voltage sag prior to fault clearing and the subsequent two fast recloser operations The reclose time (the time the recloser was open) was a little more than 2 s, a very common time for a utility line recloser Apparently, the fault perhaps, a tree branch was not cleared completely by the first operation, forcing a second The system was restored after the second operation There are a few things to note about this typical event that will tie in with other material in this book: 1 The voltage did not go to zero during the fault as is often assumed in textbook examples There are few examples of the textbook case in real life 2 The line recloser detected the fault and operated very quickly There is a common misconception that fault interruption is slower on the distribution system than on the transmission system While it can be slower, it can also be faster 3 Since the voltage did not collapse to zero during the fault, induction machines will continue to have excitation and continue to feed the
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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