|
Koordinacija zaštite od gubitka pobude sa funkcijom limitera minimalne pobude sistema regulacije napona
Coordination between loss of excitation protection and minimum excitation limit function of voltage regulation system
Keywords: under excitation protection; minimal excitation limiter; capacitive mode
Sažetak
Uobičajena praksa je da se sistem relejne zaštite i funkcije sistema regulacije pobude nezavisno podešavaju, što vrlo često dovodi do nekoordiniranog delovanja. Pri pojavi poremećaja u mreži, potrebno je obezbediti da osnovne zaštite eliminišu nastali poremećaj ako za tim ima potrebe, a da se svi generatori odazovu tako da se očuva stabilnost sistema a da se pritom iskoriste njihove mogućnosti. Osnovni zadatak zaštite od gubitka pobude jeste da spreči oštećenje mašine u trajno nedozvoljenom režimu rada i da spreči preuzimanje velikih količina reaktivne snage iz sistema koje mogu dovesti do naponskog kolapsa ili ispada vodova u prenosnom sistemu. U ovom radu prezentovane su funkcije zaštite od gubitka pobude i lim itera minimalne pobude koji je sastavni deo automatske regulacije napona sistema pobude, kao i njihova međusobna koordinacija. U radu su data postojeća podešenja i predlog podešenja na osnovu proračuna za određene generatore EPS-a.
Abstract
Established practice is such that the relay protection system and excitation system are adjusted independently of each other, which very often leads to non-coordinated action. When network disturbance occur, it is necessary to provide that basic protection functions eliminate the fault if it is necessary, and that all generators respond so as to preserve system stability and use the most of their capabilities. The basic task of under excitation protection is to prevent damage to the generator in a not allowed mode of operation. Also it is important to prevent the absorption of large amounts of reactive power from system that can lead to voltage collapse or line failure in the transmission system. This paper deals with under excitation protection and minimal excitation limiter, which is a part of excitation system, as well as with coordination between them. In the paper the current and the proposed settings are presented regarding case studies of generators in power plants in "EPS".
|