Feasibility Analysis of Tripping in Small Current Grounding System

2011 ◽  
Vol 130-134 ◽  
pp. 4240-4244
Author(s):  
Yi Shi Shu ◽  
Li Li Ma ◽  
Pei Jie Yu
Keyword(s):  
Low Voltage ◽  
Distribution Automation ◽  
Personal Safety ◽  
Small Current ◽  
Grounding System ◽  
Voltage Security ◽  
Integrated Automation ◽  
Ground Fault ◽  
Automation Systems ◽  
Automation Technology

With the development of integrated automation systems and distribution automation technology, considering the safety of grid equipment, the voltage security of low-voltage power grid, personal safety and the characteristics of small current grounding system , this paper points out that still follow the old rules that run 0.5-2 hours allowed in dealing with ground fault of small current grounding system is unreasonable, elaborates the new philosophy that the protection function of small current grounding should be distributed to the feeder protection device and implemented tripping. Theoretical analysis shows that the scheme is accurate, reliable, and highly practical.

A Survey on Single-Phase Faulty Line Selection Techniques for Small Current Grounding System in Medium-Voltage Grid

2014 ◽  
Vol 492 ◽  
pp. 407-411 ◽  
Author(s):  
Yin Tao ◽  
Yu Juan
Keyword(s):  
Single Phase ◽  
Development Trend ◽  
Small Current ◽  
Simulation Research ◽  
Grounding System ◽  
Medium Voltage ◽  
Fault Line Selection ◽  
Ground Fault ◽  
Line Selection ◽  
The Development Trend

Single-phase ground fault line selection problem has never been satisfactorily resolved in small current neutral grounding system in china. According to such a situation and combining theoretical analysis and simulation research with reports published in literature, existing faulty line selection technologies are generalized, and working principles, application conditions and existing defects of these technologies are analyzed, meanwhile the feasible improvement of these technologies and the up-to-date research achievements, and deficiencies of applications in this field are summarized. Finally, the development trend of faulty line selection technology for small-current neutral grounding system is pointed out.

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 Harmonic Current Distribution in Grounding Systems of Cabled Medium Voltage Grids during Single-Pole Ground Fault

Energies ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 1110
Author(s):  
Benjamin Küchler ◽  
Uwe Schmidt ◽  
Jonathan Hänsch
Keyword(s):  
Current Distribution ◽  
Power Supply ◽  
Low Voltage ◽  
Human Life ◽  
Research Work ◽  
Fault Current ◽  
Current Harmonics ◽  
Grounding System ◽  
Medium Voltage ◽  
Ground Fault

The design of every power supply system must guarantee the safety for human life even in the event of a fault. Due to the system change in the electrical power supply, the fault current contains more and more unknown shares of current harmonics. Especially in medium voltage grids, which are operated with resonant grounding, these are determining for the level of the single-pole ground fault current for determination of permissible touch voltages and compliance with the normative requirements of the European standard EN 50522 must therefore be re-evaluated. In its first part, this concept paper presents the frequency dependent principles of earth loops formed by the grounding system. The focus here is on cabled grids and the influence of connected structures of the low voltage grid. The second part deals with the superposition of these loop currents and the resulting earth currents in case of a line to ground fault. The authors address explicitly the frequency dependence of the current distribution and describe the expected behaviour for current harmonics. The proposed approaches result from processing the state of knowledge, research work and the evaluation of several measurements. The aim is to develop an understanding of the influence of the components connected to a grounding system and to derive generally applicable principles. Therefore, the authors present the results of recent measurements in the last part of the handed paper and point out the possibilities and limits of modeling. It is shown that a dedicated treatment of harmonic currents in the case of a single-pole fault is possible with the methods described. This allows these to be neglected in the estimation of touch voltages under specified circumstances, saving costs for the assessment of grounding systems.

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.

Sign in / Sign up

Export Citation Format

Share Document