TITLE:
Busbar Differential Relaying Method Based on Combined Amplitude and Phase Information of High Frequency Transient Currents
AUTHORS:
Xiao Wu, Zhengyou He, Xiaopeng Li
KEYWORDS:
Busbar Protection; High Frequency Transient Currents; Complex Wavelet Analysis; Polar Coordinate
JOURNAL NAME:
Energy and Power Engineering,
Vol.5 No.4B,
November
18,
2013
ABSTRACT: Busbar differential relaying method based on combined
amplitude and phase information of high frequency transient currents is put
forward in this paper for the speed and reliability problems of busbar
protection based on fundamental frequency. Under the analysis of features of
bus high frequency differential currents, complex wavelet analysis is used to
extract the amplitude and phase features of 1/4 period high frequency
differential currents, and amplitude and phase information are used to form the
polar coordinates. Bus fault is identified intuitively and precisely according
to polar locus differences. This polar coordinates represented busbar
differential protection scheme based on high frequency transient signals can
not only avoid TA saturation, realizing quick protection, lots of PSCAD/EMTDC
simulations also show that this busbar differential protection scheme works
well under different fault conditions.