A novel busbar protection scheme based on wavelet multi-resolution signal decomposition

A novel busbar protection scheme based on wavelet transform is proposed in this paper. This busbar protection scheme utilizes the characteristic of multi-resolution signal decomposition of wavelet transform to decompose the fault current signals into different frequency bands. The differential current signals are computed from the decomposed current signals. This busbar protection scheme utilizes not only the power frequency currents but also the high frequency currents. High frequency currents enable the busbar protection to operate fast. Power frequency currents can improve reliability of the busbar protection. Alternative Transients Program (ATP) simulations are used to test and validate the proposed scheme. The scheme is immune to CT saturation and is fast, reliable and feasible.