Open AccessAnalysis on burning failure of main transformer in 220kV substation
Author(s) -
Dewen Zhang,
Xianfeng Lin,
Geng Song,
Yang Liu,
Zhibin Li
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/651/2/022015
Subject(s) - ground , overvoltage , transformer , electrical engineering , arc fault circuit interrupter , arc suppression , engineering , fault (geology) , reliability engineering , electric power system , short circuit , earthing system , reliability (semiconductor) , voltage , power (physics) , physics , quantum mechanics , seismology , geology
Neutral point ungrounded three-phase system is widely used in 10kV and 35kV low-voltage systems because of its higher power supply reliability. When the single-phase grounding short-circuit fault occurs in the system, the other two phases can continue to operate for a period of time to ensure the reliability of power supply. However, when the system operates under single-phase grounding fault, arc grounding overvoltage is easy to occur, which may damage electrical equipment or develop into phase-to-phase short circuit. This paper analyses a burning accident of main transformer caused by arc grounding overvoltage in 220kV substation, obtains fault recording information, points out fault causes and puts forward corresponding preventive measures.