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.

Adjusting the Degree of Compensation of Small Current Grounding System Petersen Coil

2014 ◽  
Vol 620 ◽  
pp. 394-397
Author(s):  
Xiang Dong Zhao ◽  
Feng Zhen Liu ◽  
Ye Tian
Keyword(s):  
Single Phase ◽  
Neutral Point ◽  
Normal Operation ◽  
Stable Operation ◽  
Small Current ◽  
Operating Personnel ◽  
Grounding System ◽  
Arc Suppression Coil ◽  
Petersen Coil ◽  
Improve Reliability

While the system is equipped with Petersen coil caused by the switching operation can prevent a different period , single-phase disconnection and other factors neutral point displacement , so that the neutral point voltage is too high, the threat of insulation safety equipment . Also in the normal operation of the power grid , but also effectively prevent resonance over-voltage , prevent system damage caused thereby , better protection of system security , stability, and high-quality operation. Summary of small current grounding system after the formation of arc suppression coil compensation compensation network system , in order to better prevent arc short-circuiting the system of single phase , which is to ensure security of supply , improve reliability and power quality .In the paper, small current grounding system Petersen coil with the compensation adjustment is carried out and some analysis, study and research is done in order to improve the operating personnel awareness and emphasis on small current grounding system , and better ensure the safety of the small current grounding system , stable operation.

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.

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.

A Fault Line Detection Method Based on Wavelet Packet Analysis in Distribution Network

2012 ◽  
Vol 614-615 ◽  
pp. 1833-1840
Author(s):  
Li Li
Keyword(s):  
Single Phase ◽  
Hot Spot ◽  
Wavelet Packet ◽  
Short Circuit ◽  
Rapid Development ◽  
Network System ◽  
Power Network ◽  
Fault Line ◽  
Small Current ◽  
Grounding System

With the rapid development of power network automation, the detection of the default single-phase grounding fault line in small current neutral grounding system has became a hot spot in research of power network system. Generally, power network neutral point is not grounded or grounded through arc-suppression coil grounding. When single phase grounding fault occurs, the power network system is named as small current grounding system since the grounding short-circuit is small due to a low-impedance short circuit.

Fault Line Selection Research on Single Phase Ground Fault of Small Current Grounding System Based on Wavelet Theory

2014 ◽  
Vol 513-517 ◽  
pp. 3552-3555
Author(s):  
Xiang Gao ◽  
Lu Wang
Keyword(s):  
Single Phase ◽  
Selection Criterion ◽  
Fault Line ◽  
Wavelet Theory ◽  
Small Current ◽  
Grounding System ◽  
Fault Line Selection ◽  
Ground Fault ◽  
Line Selection ◽  
Wavelet Transform Modulus Maximum

For the problem of single-phase ground fault line selection of small current grounding system, in this paper, according to the wavelet theory advantage processing capabilities of transient mutation signal ,line selection criterion based on wavelet transform modulus maximum principle of singularity detection is proposed . By analyzing the single-phase ground fault waveform of small current grounding system in the neutral point not effective grounding system, steady state and transient characteristics of fault occurs is obtained, building bus with three outlets of 10KV small current grounding system simulation model by using MATLAB software, and verifying the validity though a large number of simulation experiments on the method.

scholarly journals Small Current Fault Line Selection Based on Improved Empirical Mode Decomposition and Fractal Dimension Method

CONVERTER ◽  
2021 ◽  
pp. 09-18
Author(s):  
Chao Liu, Limei Yan,Yina Zhou
Keyword(s):  
Fractal Dimension ◽  
Fault Line ◽  
Small Current ◽  
Grounding System ◽  
Scale Free ◽  
Fault Line Selection ◽  
Mode Decomposition ◽  
Zero Sequence ◽  
Line Selection ◽  
Line Slope

In this paper, the fault steady state and transient characteristics of small current grounding system are analyzed, and the distribution of transient zero sequence current is introduced. A fault line selection based on EMD and fractal dimension method is proposed. After the parameter is determined, the problem is proposed and improved. Using the simulated annealing K-means algorithm to find the scale-free interval curve to get the line slope is the correlation dimension of the line. Finally, by comparing the size of the associated dimension, you can select the corresponding line of the faulty distribution network.

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