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The second protection scheme described here represents the other extreme from the simple scheme presented in Sec 983 Figure 937 shows the key functions in an actual distribution-connected DG installation that employs a primary-side recloser This is a relatively complex
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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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Distributed Generation and Power Quality Distributed Generation and Power Quality 431
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interconnection protection scheme for a large synchronous generator There are many other variant schemes that may also be applied, and the reader is referred to vendors of DG packages whose literature describes these in great detail A large DG installation on the distribution system would typically correspond to generators in the 1- to 10-MW range Most generators larger than this will be interconnected at the transmission level and have relaying similar to utility central station generation Figure 937 shows the relays necessary for interface protection as well as some of the relays necessary for generator protection Not all
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UTILITY BREAKER OR RECLOSER GENERATOR TRANSFORMER 81 O/U 27/59 47 59 I 59 N
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(GENERATOR PROTECTION) DG
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Figure 937 Protection scheme for a large synchronous generator with high-
side recloser
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
Distributed Generation and Power Quality 432 Nine
the functions that might be necessary for proper control of the generator, interlocking of breakers, etc, are shown This installation is comprised of multiple generators connected identically In this example, there is a primary-side utility breaker for which utilities will typically use a common three-phase recloser This is a convenient switchgear package for utilities to install and probably the least costly as well The recloser comes with overcurrent relaying (not shown), and a separate DG relay package has been added that operates off a separate potential transformer This is the main breaker used to achieve or ensure separation of the generator(s) from the utility The relaying elements in the system and their function are as follows
Primary side
27/59: standard under/over voltage relay This serves as the primary means of fault and island detection This can be used to block closing of the breaker until there is voltage present on the utility system, or there may be a separate relay for that purpose 81 O/U: standard over/under frequency relay for islanding detection 47: negative-sequence voltage relay (optional) This is a backup means for detecting utility-side faults that can be more sensitive than voltage magnitudes in some cases Also, it helps prevent generator damage due to unbalance, although there is another relay for that here 59I: instantaneous (peak) overvoltage This is a supplemental islanding detection function This would be employed in cases where ferroresonance or other resonance phenomena are likely This would occur when utility-side capacitors interact with the generator reactance Since such overvoltages can cause damage quickly, the time delay is much shorter than for the other relays but not so short that it trips on utility capacitor-switching transients 59N (or 59G): neutral or ground overvoltage This relay is installed in the corner of a broken delta connection on the potential transformer It is a supplemental fault and islanding detection relay function that measures the zero-sequence voltage This would detect conditions in which the generator is islanded on an SLG fault It is more necessary when the primary connection of the transformer is delta or ungrounded-wye
These relaying functions may be moved to the secondary side of the service transformer if there is no high-side breaker The relays would then trip the main breaker on the secondary side
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