scholarly journals The Study of Fault Location Method Based on FTU Feeder Automation Technology

2013 ◽  
Vol 7 (1) ◽  
pp. 143-148
Author(s):  
Zhou Jun ◽  
Cao Ke-Zheng ◽  
Zheng Hong-Xia
Keyword(s):  
Power Distribution ◽  
Fault Location ◽  
Single Phase ◽  
Automation System ◽  
Fault Line ◽  
Feeder Automation ◽  
Grounding System ◽  
Arc Suppression Coil ◽  
Zero Sequence ◽  
Automation Technology

With the development of power distribution automation system, feeder automation technology in the small current grounding system single-phase grounding fault location plays an important role. In the neutral arc suppression coil grounding system, because of the compensation effect of arc suppression coil, the system fault feature is not obvious. This paper puts forward a method of RL series branch parallel in arc suppression coil, when system single-phase grounding fault occurs, the series branch switch gets closed and acts on the neutral, that changes the compensation degree of arc suppression coil to zero sequence current in fault line, the change of zero sequence residual current being the biggest in the fault section from neutral to fault point. FTU is used to monitor the change in each fault line for fault regional location.

Locating Method of Single-Phase Grounding Fault in Small Current Grounding System Based on Distribution Automation

2013 ◽  
Vol 321-324 ◽  
pp. 1423-1428
Author(s):  
Jun Zhou ◽  
Ke Zheng Cao
Keyword(s):  
Single Phase ◽  
System Modeling ◽  
Simulation Method ◽  
Neutral Point ◽  
Distribution Automation ◽  
Fault Line ◽  
Small Current ◽  
Grounding System ◽  
Arc Suppression Coil ◽  
Zero Sequence

In case of the arc suppression coil for neutral point grounding of small current grounding system, when single-phase grounding fault occurs, due to the arc suppression coil for fault line of the compensation effect of the zero sequence current, the fault features is not obvious, it can't implement the fault line selection and fault point location. This paper puts forward a method of change fault lines zero sequence current shortly, namely a resistance inductance (RL) series branch parallel in arc suppression coil, the series branch acts on the system shortly and changes arc suppression coil compensation degree temporarily in single-phase grounding fault. The change of zero sequence residual current only appears the loop from the neutral point to the fault point via the fault line, using FTU (feeder terminal units) on lines monitor the change of zero sequence current on each nodes for fault regional location. And prove this theory the feasibility of the by using MATLAB software of system modeling simulation method.

The Research Based on Zero Sequence Energy to the Line Selection in Distribution Network

2012 ◽  
Vol 614-615 ◽  
pp. 846-849
Author(s):  
Shu Tian ◽  
Jin Peng He ◽  
Yu Zheng
Keyword(s):  
Single Phase ◽  
Distribution Network ◽  
Power Network ◽  
Fault Line ◽  
Ground Fault ◽  
Arc Suppression Coil ◽  
Zero Sequence ◽  
Line Selection ◽  
Fault Lines ◽  
Resistance Component

When single phase-to-ground fault happened in power network with arc suppression coil grounded, capacitor current through fault point is compensated and reduced by installing arc suppression coil. Zero-sequence current’s amplitude and phase of fault lines and sound lines are so similar that it increases the difficulty of selecting the fault line. But the resistance component of zero sequence current has no relationship with the arc extinguishing coil compensation, absolute value of resistance component to the fault lines show the maximum, and zero sequence current’s polarity of fault lines is contrary to sound lines. In this paper, because of the characteristic of resistance component, a method is put forward based on zero sequence energy to the line selection in distribution network, it import auto-reclosing techniques into the line selection. The principle is verified by MATLAB simulator. It has high accuracy to select the fault line with this method.

scholarly journals Fault Line Selection of Non-solidly Grounding System Based on EMD and Correlation Analysis of Zero Sequence Current Break-variable

2021 ◽  
Vol 2087 (1) ◽  
pp. 012021
Author(s):  
Guo Hu ◽  
Qin Jun ◽  
Hai Wu ◽  
Song Hu ◽  
Lei Xia ◽  
...  
Keyword(s):  
Correlation Analysis ◽  
Single Phase ◽  
Intrinsic Mode Functions ◽  
Fault Line ◽  
Actual System ◽  
Grounding System ◽  
Fault Line Selection ◽  
Current Break ◽  
Zero Sequence ◽  
Line Selection

Abstract When a single-phase grounding fault occurs in non-solidly grounding system, the zero sequence transient current is nonlinear and non-stationary. Especially when the resonant system is grounded with high resistance, the transient quantity is weak, which brings challenges to data processing. Therefore, empirical mode decomposition (EMD) is proposed to decompose the transient quantity and obtain different intrinsic mode functions (IMF). The IMF with the largest discrimination is selected as the characteristic quantity for correlation analysis. At the same time, considering the existence of unbalanced current in the actual system, in order to avoid the influence of unbalanced current, a single-phase grounding fault line selection algorithm based on EMD decomposition and correlation analysis of zero sequence current break-variable is proposed. Finally, the effectiveness of the method is verified by simulation and field test waveforms.

A New Detection Way for Single- Phase to Ground Fault Based on Energy Function Intergral and Wavelet Packets

2012 ◽  
Vol 217-219 ◽  
pp. 2629-2633 ◽  
Author(s):  
Yang Liu ◽  
Zhang Bao Chen ◽  
Lin Ye
Keyword(s):  
Single Phase ◽  
Integral Transform ◽  
Phase Distribution ◽  
Wavelet Packets ◽  
Fault Line ◽  
Line Energy ◽  
Ground Fault ◽  
Zero Sequence ◽  
Line Selection ◽  
Parallel Resistance

In order to find new fault line selection method of single-phase distribution network, First parallel resistance in the neutral point in order to increase the transient component of the fault line, obtained the line energy after the failure through the integral transform , initially selected probable fault lines , on this basis, decompose all the transient zero sequence currents in every line by separation based on nicer separate frequency characteristic of wavelet packets, to accurately determine the greatest fault line by the characteristic that the value of second singular point generated by zero sequence current is maximum and its polarity is opposite to the other normal lines, simulation results show the effectiveness and correctness of the method. So the method for detection of the fault line based on wavelet packets and the compare of energy is new and effective.

scholarly journals Reflected Traveling Wave Based Single-Ended Fault Location in Distribution Networks

Energies ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3917 ◽  
Author(s):  
Yangang Shi ◽  
Tao Zheng ◽  
Chang Yang
Keyword(s):  
Traveling Wave ◽  
Power Distribution ◽  
Fault Location ◽  
Single Phase ◽  
Distribution Network ◽  
Distribution Networks ◽  
Power Distribution Networks ◽  
Reflected Waves ◽  
Ground Fault ◽  
Location Methods

Traveling wave (TW)-based fault-location methods have been used to determine single-phase-to-ground fault distance in power-distribution networks. The previous approaches detected the arrival time of the initial traveling wave via single ended or multi-terminal measurements. Regarding the multi-branch effect, this paper utilized the reflected waves to obtain multiple arriving times through single ended measurement. Potential fault sections were estimated by searching for the possible traveling wave propagation paths in accordance with the structure of the distribution network. This approach used the entire propagation of a traveling wave measured at a single end without any prerequisite of synchronization, which is a must in multi-terminal measurements. The uniqueness of the fault section was guaranteed by several independent single-ended measurements. Traveling waves obtained in a real 10 kV distribution network were used to determine the fault section, and the results demonstrate the significant effectiveness of the proposed method.

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