Fault Line Selection Method of Small Current to Ground System Based on Atomic Sparse Decomposition and Extreme Learning Machine

Table 4

Zero sequence current local characteristic parameters of overhead line .

Atoms	Amplitude	Frequency shift/Hz	Phase/rad	Start time/ms	End time/ms
1	3.8654	472.9299	1.5419	10.2568	—
2	0.0485	50.9554	−2.1710	15.5897	—
3	1.2352	1778.6624	0.9501	8.5679	—
4	1.3446	1176.7516	1.2609	9.5879	22.5625