Open AccessFault line detection in neutral point ineffectively grounding power system based on phase‐locked loop
Author(s) -
Zhixia Zhang,
Xiao Liu,
Zailin Piao
Publication year - 2014
Publication title -
iet generation, transmission and distribution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.92
H-Index - 110
eISSN - 1751-8695
pISSN - 1751-8687
DOI - 10.1049/iet-gtd.2013.0235
Subject(s) - ground , fault (geology) , harmonic , line (geometry) , fault detection and isolation , matlab , power (physics) , computer science , fault indicator , point (geometry) , symmetrical components , focus (optics) , earthing system , control theory (sociology) , electronic engineering , engineering , voltage , electrical engineering , acoustics , physics , artificial intelligence , mathematics , geometry , control (management) , quantum mechanics , seismology , geology , actuator , transformer , optics , operating system
Fault line detection timely and accurately when single‐phase‐to‐earth fault occurs in neutral point ineffectively grounding power system is still a focus of research. To perfect these existing detection methods and enhance their accuracy, an improved phase‐locked loop (IPLL) is used to extract the fifth harmonic zero‐sequence currents in this study and fifth harmonic current characteristics are employed to select the fault line. Through relative processing, the fifth harmonic data differences of all lines are more noticeable, which is better for fault line detection. The line‐detection function of IPLL is shown based on Matlab/Simulink. Simulation result reveals the good performance of this proposed method in effectively fault line detection. This method is able to detect different types of grounding faults in power system. This study gives a new train of thought for fault line detection.