In:
Applied Mechanics and Materials, Trans Tech Publications, Ltd., Vol. 303-306 ( 2013-2), p. 1920-1924
Kurzfassung:
In order to make it clear for explosion accidents of parallel capacitors occurred in 500kV substations in Sichuan power network one after another, the authors calculate and analyze the distribution of overvoltage caused by breakdown of elements within the capacitor bank. Dissecting the insulation of faulty capacitors, severe ageing of insulation is discovered; this phenomenon proves that the overvoltage on partial element should be the main factor influencing the insulating performance of capacitors. To ensure the reliable operation of parallel capacitors the setting value of unbalanced current protection at the neutral point of double star connection is modified by the calculated value of unbalanced current of 35kV capacitor bank in which there are six parallel groups of capacitors and in each group seven capacitors are connected in series.
Materialart:
Online-Ressource
ISSN:
1662-7482
DOI:
10.4028/www.scientific.net/AMM.303-306
DOI:
10.4028/www.scientific.net/AMM.303-306.1920
Sprache:
Unbekannt
Verlag:
Trans Tech Publications, Ltd.
Publikationsdatum:
2013
ZDB Id:
2251882-4
