Title :
New scheme for transformer protection
Author :
Chen, Songlin ; Li, Haiying ; Li, Jiuhu ; Zheng, Yuping ; Shen, Guorong
Author_Institution :
Nanjing Autom. Res. Inst., China
Abstract :
This paper deals with the new scheme of transformer protection. First, reviews and analyzes the problem of transformer protection, which includes magnetizing inrush, overexcitation, current transformer (CT) saturation, and the sensitivity of the differential relay. Then, the paper proposes a new scheme for transformer protection. Finally, the scheme was tested in a lab and real operation conditions of a power system. The results show that the relay never mal-operated and correctly identified all the faults that are applied.
Keywords :
current transformers; fault diagnosis; power transmission protection; relay protection; testing; current transformer saturation; differential relay sensitivity; digital protective relay; fault identification; magnetizing inrush; overexcitation; power frequency component deviation; power systems; transformer protection; zero sequence percentage differential relay; Circuit faults; Current transformers; Fault currents; Magnetic analysis; Power system protection; Power system relaying; Protective relaying; Saturation magnetization; Surge protection; System testing;
Conference_Titel :
Power System Technology, 2002. Proceedings. PowerCon 2002. International Conference on
Print_ISBN :
0-7803-7459-2
DOI :
10.1109/ICPST.2002.1053543
