Traveling-wave starting algorithm based on morphological gradient and wavelet transform modulus sum
Wei Wang · Power System Protection and Control · 2009
The traveling-wave based starting element is very important for ultra-high-speed protection and traveling-wave based fault locator. Based on illustrating the basic theory of mathematical morphology, morphological gradient is applied to the new traveling-wave based starting element in order to solve the deficient sensitivity and even fail-function under weak faults, which problems appear in the previously proposed starting algorithms. And because wavelet transform modulus sum is quite suitable for the non-isolated singularity detection, it is also utilized in the new starting algorithm to correctly distinguish fault traveling-wave from noise disturbance. Thus a newly perfect starting element is proposed, and a number of ATP simulation tests show that the new starting algorithm is sensitive and reliable, while ensuring the fast operation.