Phase current fault component based single-phase earth fault segment location in non-solidly earthed distribution networks

2014 ◽  
Vol 25 (11) ◽  
pp. 2713-2730 ◽  
Author(s):  
Guobing Song ◽  
Zhibin Ma ◽  
Guang Li ◽  
Xingfu Jin
Keyword(s):  
Single Phase ◽  
Distribution Networks ◽  
Phase Current ◽  
Fault Segment ◽  
Earth Fault

scholarly journals Determining single-phase earth fault location with applying short-term double earth fault

2019 ◽  
Vol 139 ◽  
pp. 01041
Author(s):  
A.L. Kulikov ◽  
V.Ju. Osokin ◽  
D.I. Bezdushniy
Keyword(s):  
Fault Location ◽  
Single Phase ◽  
Distribution Networks ◽  
Accurate Solution ◽  
Accurate Calculation ◽  
Short Term ◽  
Earth Fault ◽  
Predominant Type ◽  
The Future ◽  
Artificial Introduction

The single-phase earth faults location are the predominant type of damage in distribution networks of 6-35 kV. The problem of remotely determining the fault location during single-phase earth faults has not definitely accepted practical and accurate solution. The article proposes and substantiates the intellectual methods of determining the fault location with using artificial introduction of short-term double earth faults. In the future by recorded oscillograms of currents and voltages, an accurate calculation of the distance to the damage is assumed.

Single Phase Earth Fault Location in the Medium Voltage Distribution Networks

2009 ◽  
Vol 25 (25) ◽  
pp. 13-18 ◽  
Author(s):  
Jevgēnijs Linčiks ◽  
Dzintars Baranovskis
Keyword(s):  
Fault Location ◽  
Single Phase ◽  
Distribution Networks ◽  
High Accuracy ◽  
Calculation Methods ◽  
Voltage Distribution ◽  
Medium Voltage ◽  
Earth Fault ◽  
Location Methods

Single Phase Earth Fault Location in the Medium Voltage Distribution NetworksThis paper gives a description of the single phase earth fault location methods in the medium voltage networks. The single phase earth fault location in the medium voltage distribution networks is problematic now. The technical devices which are using in Latvia now do not allow to detect the single phase earth faults fast and high accuracy. Fast earth fault location should be possible by using the equipments which are calculating distance to earth faults. But precisely calculate the distance to the single phase earth faults in the medium voltage networks is very difficult. The paper presents the single earth fault location methods including the calculation methods for fault distance.

scholarly journals Parameters of Insulation Relative to the Ground in Quarry Distribution Networks of Mining Enterprises in the Republic of Tajikistan

2021 ◽  
Vol 21 (1) ◽  
pp. 29-37
Keyword(s):  
Single Phase ◽  
Distribution Networks ◽  
Network Capacity ◽  
Life Safety ◽  
State University ◽  
Earth Fault ◽  
Electrical Distribution ◽  
Electrical Distribution Networks ◽  
The Republic

The article discusses a brief description of the mining enterprises of the Republic of Tajikistan, the insulation level of 6 kV quarry distribution networks. The parameters of network insulation relative to the ground are indicated as determined on the basis of the methods developed at the Department of Life Safety, South Ural State University. The performed calculations of insulation relative to the ground in quarry electrical distribution networks of mining enterprises in the Republic of Tajikistan showed that the value of the capacitive currents of a single-phase earth fault lies in the 0.1–0.37 A range and depends on the level of development of the enterprise. Considering the change in the network quiescence coefficient, the active insulation resistances of the network phases relative to the ground are in the 18–112 kΩ range. The network capacity relative to the ground is in the 0.09–0.34 µF range. The data obtained is necessary for selecting a security tool and evaluating the level of security.

scholarly journals Application of Apparent Impedance Method at Variable Specific Resistance of Phase Conductor

2008 ◽  
Vol 45 (1) ◽  
pp. 25-40 ◽  
Author(s):  
J. Survilo
Keyword(s):  
Single Phase ◽  
Specific Resistance ◽  
Distribution Networks ◽  
Impedance Method ◽  
Phase Voltage ◽  
Line Load ◽  
Earth Fault ◽  
Fault Resistance ◽  
Wide Range ◽  
Specific Line

Application of Apparent Impedance Method at Variable Specific Resistance of Phase ConductorThe apparent impedance to single-phase earth fault place is obtained applying the classical algorithm of distance protection. Thanks to a complex character of this impedance, the expression for the algorithm decomposes into two equations, allowing two unknowns to be calculated: the reactance to a fault place and the fault resistance, provided the faulty phase voltage and current as well as ground current or zero sequence current are known. To do this, a special mathematical procedure called here the apparent impedance method is employed, which implies the use of specific line parameters. For high voltage two-terminal and radial lines of distribution networks the iterative procedure could be applied under the condition that the faulty phase voltage is measured in a distribution network with sufficient precision. Among other specific line parameters, the inconsistency of specific resistance of the phase conductor deserves special attention because of its unpredictable nature and wide range of deviations causing inadmissible errors in distribution networks. To cope with this shortcoming, the temperature of the phase conductor wire should be known at the moment of fault inception. Otherwise, the single-phase earth fault current should be increased to the level above the half the line load current.

Research on the Positioning Method of Single-Phase to Earth Fault in Distributed Distribution Network

2021 ◽  
Vol 105 ◽  
pp. 151-158
Author(s):  
Shi Qin Zhao ◽  
Rong Jia Cen ◽  
Chun Qing Shi
Keyword(s):  
Single Phase ◽  
Clustering Algorithm ◽  
Distribution Network ◽  
High Density ◽  
Equivalent Model ◽  
Analysis Method ◽  
Phase Current ◽  
Earth Fault ◽  
Positioning Method ◽  
Positioning Time

The existing high-density distributed distribution network single-phase earth fault interval location method has the disadvantage of long positioning time. Hence, a single-phase earth fault interval positioning method for high-density distributed distribution network is proposed to solve this problem. In order to accurately locate the single-phase earth fault interval of distribution network, zero-order equivalent model of distribution network is built at first. Next the clustering algorithm is used to extract the single-phase earth fault characteristics, while the single-phase earth fault phase current increment is calculated by using the analysis method to obtain the single-phase earth fault phase current increment law. Then a fault-maximum interval T-shaped structure is built to divide the potential fault interval. Finally, the S-transformation is applied to accurately locate the single-phase earth fault interval, and the localization of the single-phase earth fault interval of the high-density distributed distribution network is achieved. The experimental results show that comparing with the existing high-density distributed distribution network single-phase earth fault interval positioning method, the proposed high-density distributed distribution network single-phase earth fault interval positioning method dramatically reduces the positioning time. It is fully explained that the proposed method in this article has a better positioning effect.

VVCF Single-phase Current Source Converter using Single Bridge

2012 ◽  
Vol 132 (3) ◽  
pp. 452-453
Author(s):  
Yasuhiko Neba ◽  
Hirokazu Matsumoto ◽  
Ryozo Itoh ◽  
Kouichi Ishizaka ◽  
Koichiro Hashimoto ◽  
...  
Keyword(s):  
Single Phase ◽  
Current Source ◽  
Phase Current ◽  
Current Source Converter
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