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

Table 3

Every atom characteristic parameters of overhead line .

Atoms	Scale /pu	Location shift /pu	Frequency shift /Hz	Phase/rad	Atom amplitude
1	3.941 × 10^4	−2.7094 × 10^5	0.0297	1.5419	0.0385
2	1.15 × 10^6	−2.6135 × 10^6	0.0032	−2.1710	0.0048
3	4.1957 × 10^4	−1.6524 × 10^5	0.1117	0.9501	0.0122
4	2.97 × 10^3	−1.7133 × 10^3	0.0739	1.2609	0.0135