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In computing the short-circuit current at the PCC, the normal system conditions that result in minimum short-circuit capacity at the PCC should be used since this condition results in the most severe system impacts A procedure to determine the short-circuit ratio is as follows: 1 Determine the three-phase short-circuit duty ISC at the PCC This value may be obtained directly from the utility and expressed in amperes If the short-circuit duty is given in megavoltamperes, convert it to an amperage value using the following expression: ISC 1000 MVA 3 kV A (62)
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where MVA and kV represent the three-phase short-circuit capacity in megavoltamperes and the line-to-line voltage at the PCC in kV, respectively 2 Find the load average kilowatt demand PD over the most recent 12 months This can be found from billing information 3 Convert the average kilowatt demand to the average demand current in amperes using the following expression: IL kW PF 3 kV A (63)
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where PF is the average billed power factor 4 The short-circuit ratio is now determined by: Short-circuit ratio ISC IL (64)
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This is the short-circuit ratio used to determine the limits on harmonic currents in IEEE Standard 519-1992 In some instances, the average of the maximum demand load current at the PCC for the previous 12 months is not available In such circumstances, this value must be estimated based on the predicted load profiles For seasonal loads, the average should be over the maximum loads only
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Current limit evaluation procedure This procedure involves evaluation
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of the harmonic generation characteristics from individual end-user loads with respect to IEEE Standard 519-1992 limits However, special consideration is required when considering power factor correction equipment
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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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Applied Harmonics Applied Harmonics 233
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1 Define the PCC For industrial and commercial end users, the PCC is usually at the primary side of a service transformer supplying the facility 2 Calculate the short-circuit ratio at the PCC and find the corresponding limits on individual harmonics and on the TDD 3 Characterize the harmonic sources Individual nonlinear loads in the facility combine to form the overall level of harmonic current generation The best way to characterize harmonic current in an existing facility is to perform measurements at the PCC over a period of time (at least 1 week) For planning studies, the harmonic current can be estimated knowing the characteristics of individual nonlinear loads and the percentage of the total load made up by these nonlinear loads Typical characteristics of individual harmonic sources were presented in Secs 56 and 57 4 Evaluate harmonic current levels with respect to current limits using Table 62 If these values exceed limits, the facility does not meet the limit recommended by IEEE Standard 519-1992 and mitigation may be required 62 Principles for Controlling Harmonics Harmonic distortion is present to some degree on all power systems Fundamentally, one needs to control harmonics only when they become a problem There are three common causes of harmonic problems: 1 The source of harmonic currents is too great 2 The path in which the currents flow is too long (electrically), resulting in either high voltage distortion or telephone interference 3 The response of the system magnifies one or more harmonics to a greater degree than can be tolerated When a problem occurs, the basic options for controlling harmonics are: 1 Reduce the harmonic currents produced by the load 2 Add filters to either siphon the harmonic currents off the system, block the currents from entering the system, or supply the harmonic currents locally 3 Modify the frequency response of the system by filters, inductors, or capacitors These options are described in Secs 621 through 623
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