DocumentCode :
2605395
Title :
A new approach to detecting fault line in resonant earthed system using energy ratio in short-window
Author :
Hong-chun, Shu ; Shi-xin, Peng ; Ai-bo, Li H. ; Wen-yuan, Zhao
Author_Institution :
Kunming Univ. of Sci. & Technol., Kunming, China
fYear :
2009
fDate :
6-7 April 2009
Firstpage :
1
Lastpage :
5
Abstract :
An adaptive fault line detecting method with correlation analysis using energy ratio is proposed based on the features of big capacitance current and high attenuation speed of hybrid transmission lines following single phase earthed fault. Applying wavelet packet decomposition, characteristic waveband of each zero sequence current can be determined by the theory of maximum energy, which can exclude static-component and the other wave band and enhance margin of fault line detection. According to the attenuation speed characteristic wave band of fault line´s transient capacitance current is highest, fault line can be detected by comparing relative energy of first 1/4 cycle and last 1/4 cycle during the first cycle after fault. The theoretic analysis and simulations show that, transient characteristic can be enlarged and effect of CT´s intermittent angle can be avoided by using relative energy of first 1/4 cycle and last 1/4 cycle in the fist cycle after fault to realize fault line detection, the fault line detecting method is correct and reliable within the distribution network with hybrid transmission lines.
Keywords :
earthing; fault location; power distribution reliability; power system transients; power transmission faults; power transmission lines; power transmission protection; attenuation speed characteristics; correlation analysis; distribution network reliability; fault line detection; hybrid transmission lines; maximum energy theory; resonant earthed system; transient characteristics; wavelet packet decomposition; zero sequence current; Analytical models; Attenuation; Capacitance; Fault detection; Phase detection; Power system transients; Resonance; Transient analysis; Transmission line theory; Wavelet packets; characteristic wave band; energy ratio; hybrid transmission lines; single-phase grounding fault; wavelet packet decomposition;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Sustainable Power Generation and Supply, 2009. SUPERGEN '09. International Conference on
Conference_Location :
Nanjing
Print_ISBN :
978-1-4244-4934-7
Type :
conf
DOI :
10.1109/SUPERGEN.2009.5348323
Filename :
5348323
Link To Document :
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