Two-Dimension Fault Line Selection Method Based on Transient Signal Features of Fault Phase

2011 ◽  
Vol 354-355 ◽  
pp. 1289-1292
Author(s):  
Wen Hai Zhang ◽  
Jian Wen Yang ◽  
Xian Yong Xiao ◽  
Ying Wang
Keyword(s):  
Frequency Band ◽  
Signal Amplitude ◽  
Selection Method ◽  
Transient Signal ◽  
Initial Angle ◽  
Signal Energy ◽  
Two Dimension ◽  
Fault Resistance ◽  
Signal Features ◽  
Line Selection

When single-line-to-ground fault happen in neutral non-effectively earthed system, there is a big difference between the fault feeder and un-fault feeder in transient signal energy centralized frequency band and signal amplitude of fault phase. The transient signal energy in fault feeder’s fault phase is bigger, and it centralizes in lower frequency band. But the transient signal in un-fault feeders’ has the contrary features. And this feature is affected little by the fault initial angle. So the paper proposed a method that using the gravity frequency and transient signal energy to form a two-dimension line selection method that using the signal overall distribution characteristics. It can be applied in neutral unearthed and resonant system simultaneously. And the method is effectively to different fault initial angle and fault resistance. The method is proved correctly, effectively and adaptively by actual simulation in different fault cases.

Comprehensive Line Selection Method Based on the Relative Intensity of Transient Signal

2012 ◽  
Vol 157-158 ◽  
pp. 1561-1564
Author(s):  
Li Qun Shang ◽  
Jia Jia Zhao ◽  
Jiang Ning Wang
Keyword(s):  
Steady State ◽  
Relative Intensity ◽  
Current Method ◽  
Selection Method ◽  
Previous Method ◽  
Transient Signal ◽  
Fault Line ◽  
Hilbert Huang Transform ◽  
Line Selection ◽  
Transient And Steady State

When single-phase to ground fault happens in non-effectively earthed systems, in order to select the fault line more accurately, this paper puts forward the concept that relative intensity of the transient signal (Q). And based on this, a new method processing nonlinear and the non-stationary single named Hilbert-Huang transform (HHT) was combined with the steady-state zero sequence current method, named a new line selection method which synthesized the transient and steady state quantity. The method makes full use of transient and steady-state line information, to make up for the shortage of the previous method which using single criterion to detect fault line. At last, it was showed that this method is not affected by the fault initial phase Angle and grounding resistance by MATLAB, and also its accuracy and feasibility have been verified.

scholarly journals The Half-Sine Method: A New Accurate Location Method Based on Wavelet Transform for Transmission-Line Protection from Single-Ended Measurements

Energies ◽  
2019 ◽  
Vol 12 (17) ◽  
pp. 3293 ◽  
Author(s):  
Susana Martín Arroyo ◽  
Miguel García-Gracia ◽  
Antonio Montañés
Keyword(s):  
Wavelet Transform ◽  
Transmission Line ◽  
Fault Location ◽  
Harmonic Distortion ◽  
Accurate Method ◽  
Transient Signal ◽  
Detection Scheme ◽  
Fault Resistance ◽  
The Difference ◽  
Sine Signal

In this work, a new and accurate method based on the wavelet transform is proposed for fault location in transmission-line systems. The proposed wavelet method consists of the analysis of the transient signal measured at a single end of the transmission line. Aerial current modes are used, and zero modes are included in the fault-detection scheme for low fault-inception angles. The fault distance is evaluated using the wavelet modulus maxima technique and a method based on the response to a half-sine voltage is proposed to overcome drawbacks arising from the limited sampling frequency and low fault-inception angle. The fault distance is calculated using the difference between the time when a 100 kHz half-sine signal is sent and the time when the derivative signal is received. The proposed algorithm is tested considering harmonic distortion and varying fault resistance, ground resistivity, location and inception angle. The high accuracy of the proposed algorithm is obtained even for faults close to the bus and low inception angles.

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