Title :
Applications of discrete wavelet transform for transformer inrush current detection in protective control scheme
Author :
Kunakorn, Anantawat
Author_Institution :
Dept. of Electr. Eng., King Mongkut´s Inst. of Technol., Bangkok, Thailand
Abstract :
This work proposes an algorithm for transformer protection. The technique detects an inrush current using high frequency components contained in the current transient signal of a transformer. A spectrum of the current signal is extracted using wavelet transform techniques. An analysis of the spectrum of the current transient signal is performed in order to determine whether the current is a fault or a magnetizing inrush current. Simulation studies with different fault and inrush current conditions are conducted. The results show that the proposed technique offers fast responses in protection and accurately discriminates between the inrush magnetizing current and faults.
Keywords :
discrete wavelet transforms; electric current; fault currents; magnetisation; power system simulation; power transformer protection; transient analysis; current discrimination; current signal spectrum; current transient signal; discrete wavelet transform; fault current; high frequency components; magnetizing inrush current; protective control scheme; simulation; transformer inrush current detection; transformer protection algorithm; wavelet transform techniques; Current transformers; Discrete wavelet transforms; Magnetic separation; Power harmonic filters; Power system protection; Power system relaying; Power system transients; Power transformers; Protective relaying; Surge protection;
Conference_Titel :
Communications and Information Technology, 2004. ISCIT 2004. IEEE International Symposium on
Print_ISBN :
0-7803-8593-4
DOI :
10.1109/ISCIT.2004.1413843