Grounding fault location method of overhead line based on dual-axis magnetic field trajectory

Protection and Control of Modern Power Systems

Table 9 Localization results of different methods

Method	Criteria	R_f/Ω	SNR/ dB	Initial angles	Fault section	Numerical comparisons	√ or ×
Method in [12]	Δf_v > Δn_v	5	–	60°	EF	23.46 > 0	√
	Δf_v > Δn_v	2000	120	0°	BC	0.01 < 1.31	×
	180°-Δf_a < 50°	5	–	60°	EF	40.96° < 50°	√
	180°-Δf_a < 50°	2000	120	0°	BC	172.06° > 50°	×
Proposed method	ΔL & \|Δl\| & cosδ	5	–	60°	EF	[45.3,0.2,-0.6]	√
Proposed method	ΔL & \|Δl\| & cosδ	1000	130	0°	BC	[0.5,0.3,-1,1]	√

Δf_v is the amplitude difference and Δf_a is the direction difference, Δn_v is the amplitude difference of the magnetic fields on both ends of the normal section