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 Single-Phase Grounding Fault in Distribution Networks with a DC Power Positioning Method

2014 ◽  
Vol 530-531 ◽  
pp. 353-356
Author(s):  
Run Sheng Li
Keyword(s):  
Power Distribution ◽  
Single Phase ◽  
Distribution Network ◽  
Distribution Networks ◽  
Power Distribution Network ◽  
Power Outage ◽  
Location Method ◽  
Fault Resistance ◽  
Ground Fault ◽  
Positioning Method

Due to the high ground fault resistance and the complexity of power distribution network structure (such as too many nodes, branches and too long lines), adopting common traveling wave method and ac injection method can not effectively locate the single-phase grounding fault in the distribution network system.To solve above problems and determine the position of the point of failure prisely, this paper adopted the dc location method of injecting the dc signal from the point of failure under the power outage offline. This paper introduces the single phase dc method and the method of three phase dc, and the simulation shows that the dc location method is effective and feasible.

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.

scholarly journals The Role of Fault Quotient in Determination of the Distance to a Transmission Line Fault

2008 ◽  
Vol 45 (5) ◽  
pp. 3-16
Author(s):  
J. Survilo
Keyword(s):  
Transmission Line ◽  
Single Phase ◽  
Power Lines ◽  
Impedance Method ◽  
Fault Current ◽  
Absolute Value ◽  
Fault Resistance ◽  
The Difference

The Role of Fault Quotient in Determination of the Distance to a Transmission Line Fault The notion of fault quotient refers to single-phase-earth and phase-to-phase faults in one-terminal and two-terminal (double fed), single or parallel power lines at determination of the distance to a fault place using the apparent impedance method. The fault quotient is determined as the ratio of the current through a fault place (fault current) to the current in a faulty phase at single-phase-earth faults and to the difference of currents in faulty phases at phase-to-phase faults. For one-terminal lines at single-phase-earth faults, neglecting capacitive and load currents, this ratio is 1, and for phase-to-phase faults it equals 1/2. For other cases it is a complex quantity, with the absolute value > 1 for single-phase-earth faults. Its significance grows with the fault resistance Rf. At Rf = 0 this ratio loses its significance for determination of the distance to a fault place. The tangent of the fault quotient angle with a real axis enters into the ultimate expressions for the reactance to fault place and for the fault resistance. The use of such a quotient facilitates reiterative calculations of the distance to a fault place.

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.

MEASUREMENT OF NONSINUSOIDAL FACTOR FOR SINGLE-PHASE VOLTAGE USING OF SYMMETRIC COMPONENTS FILTERS

2016 ◽  
Vol 2016 (4) ◽  
pp. 20-22
Author(s):  
D.K. Makov ◽  
◽  
O.V. Polishchuk ◽  
Keyword(s):  
Single Phase ◽  
Phase Voltage
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