Abstract First of all, the simulation of one-phase grounding fault is made for the small current grounding system. And then analysis the characteristics of the transient zero sequence current. In the initial stages, the transient fault current mainly decided by the transient capacitance current, so the fault line transient zero sequence current’s amplitude is the largest. If you ignore the transient inductance current, then the fault line transient zero sequence current’s amplitude is equal to the sum of all sound lines’ amplitude. The direction of the fault line is opposite to all sound lines’. Therefore, after we obtain the change rate of transient zero sequence current for each line, we can locate the fault line accuracy by comparing the size and polarity of them. Finally, the simulation model based on Matlab is set up for different voltage initial phase angle, transition resistance, fault location and different neutral grounding manners. The simulation results prove that the method can locate the fault line accurately and quickly with strong reliability and practicability.
Qian Hong,Huang Zhengrun,Ruan Dabing. The Study of Fault Line Selection’s Method Based on the Change Rate of Transient Zero Sequence Current for Small Current Grounding System[J]. Electrical Engineering, 2013, 14(02): 27-30.
2013, Vol. 14 
