A New Fault Line Selection Method Based on Zero-Sequence Active Component

2010 ◽  
Author(s):  
Wang Chonglin ◽  
Xin Jian ◽  
Liang Rui ◽  
Gu Yuxu
Keyword(s):  
Active Component ◽  
Selection Method ◽  
Fault Line ◽  
Fault Line Selection ◽  
Zero Sequence ◽  
Line Selection

Fault Line Selection and Section Location of Distribution Network Based on S-Transform and Zero-Sequence Reactive Power

2013 ◽  
Vol 442 ◽  
pp. 176-182
Author(s):  
Nan Hua Yu ◽  
Rui Li ◽  
Hong Guang Cao ◽  
Wei Qing Tao ◽  
Chuan Jian Li
Keyword(s):  
Reactive Power ◽  
Fault Line ◽  
Fault Line Selection ◽  
S Transform ◽  
Transient Energy ◽  
Zero Sequence ◽  
Line Selection ◽  
The Difference ◽  
Main Station ◽  
Fault Information

An approach of fault line selection and section location based on S-Transform transient energy integrated with zero-sequence reactive direction is proposed. Fault information of zero-sequence currents collected by each feeder terminal unit (FTU) were uploaded to the main station on the use of real-time communication technologies,and then the main station take analysis for the whole network fault information, using S-transform to obtain the main characteristic frequency of the signal, then compare the transient energy and zero-sequence reactive direction of each feeder line of the frequency to achieve fault line selection. According to the difference of waveform in front and back of the fault point in the fault line,using this above method to realize section location. The simulations and analysis demonstrate the accuracy and reliability of this approach , and its not affected by fault close angle, noise and other factors.

A Novel Fault Line Selection Method of Distribution Network Based on Wavelet Packet Energy

2013 ◽  
Vol 340 ◽  
pp. 572-577 ◽  
Author(s):  
Xiao Wei Wang ◽  
Yu Jun Zhang ◽  
Ya Xiao Hou
Keyword(s):  
Wavelet Packet ◽  
Distribution Networks ◽  
Maximum Energy ◽  
Fault Line ◽  
Line Energy ◽  
Branch Line ◽  
Fault Line Selection ◽  
Zero Sequence ◽  
Line Selection ◽  
Base Band

This article introduces a novel fault line selecting method which is based on the wavelet packet energy. With the db10 wavelet packet decomposition of zero-sequence transient current signal of the fault branch line, it can eliminate the component of base band of reflecting the fundamental frequency. Based on this, it can get wavelet energy of the various branch line. If a line of energy is obvious superior in contrast with the other line energy, then it is the first decision for branch line fault. Secondly, it can give the possible fault line sorting according to the principle of from large to smalland start the circuit recluse to monitor the current of the order in sequence. While 3U0 is disappeared, then determining the fault line is the maximum energy lines. If not, then continuing to monitor energy big line until the fault line is selected. The simulation results show that the accuracy rate of the fault circuit selecting method is higher, it can be applied to the fault circuit selecting of cable mixed in distribution networks.

Sign in / Sign up

Export Citation Format

Share Document