scholarly journals Simulation and Experiment Analysis of 10 kV Flexible Grounding Device

Information ◽  
2021 ◽  
Vol 12 (9) ◽  
pp. 384
Author(s):  
Mengxuan Liu ◽  
Chi Zhang ◽  
Kangli Liu
Keyword(s):  
High Resistance ◽  
Single Phase ◽  
Fault Line ◽  
Grounding System ◽  
Simulation And Experiment ◽  
Small Resistance ◽  
Calculation Module ◽  
Distribution Line ◽  
Current Calculation ◽  
A Current

The traditional 10 kV distribution network grounding system has some disadvantages, such as small grounding current and poor arc extinguishing effect, thus, hindering the detection of high-resistance grounding fault. Therefore, this paper studied the flexible grounding system consisting of small-resistance and active inverter in parallel. The control system comprises the compensation current calculation module, the fault detection module, and line protection strategy. During a single-phase grounding fault, the device is designed to inject a current of a given amplitude and phase into the neutral point to effectively suppress fault-point voltage and current and, meanwhile, quickly identifying the fault line or the busbar fault and then systematically protecting the distribution line. In addition, a large number of simulations have performed based on three grounding faults (metal, low-resistance, and high-resistance) and two modes (ungrounded and small-resistance grounding). The device can all be functional. Finally, a 400 V-level experimental prototype was built, and the experimental results are consistent with the simulation results, which can verify the effectiveness and feasibility of the flexible grounding device.

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.

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.

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.

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.

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