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1

Polarization phenomenon in underground pipeline generated by stochastic stray currents from D.C. traction

Budnik K., Machczyński W., Szymenderski J.

Poznan University of Technology Academic Journals. Electrical Engineering

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2017

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No. 89

111--122

EN

D.C electrified traction systems are a potential source of stray currents. The important problem, technically, is to evaluate the harmful effects (electrolytic corrosion) that an electrified railway has on nearby earth–return circuits (e.g. pipelines). This phenomenon is stochastic and may aggravate electrochemical corrosion in different places depending on the position of the vehicle, the load current, soil parameters, etc. The electric circuit approach, based on the complete field method of solution of the transmission–line problem (the earth–return circuit theory), to model stray currents interference on extended structures is presented. The electrode kinetics (polarization phenomenon) is taken into account in the model developed. Random algorithm allows to explore the phenomenon of polarization for different cases, which allows for generalization of the conclusions regarding the risk of corrosion in the studied systems.

2

Potential of the electric flow field produced in the earth by stray currents from D.C. traction of complex geometry

Budnik K., Machczyński W., Szymenderski J.

Poznan University of Technology Academic Journals. Electrical Engineering

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2016

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No. 85

29--40

EN

The paper presents a method of the 3D simulation of the primary scalar potential of the electric flow field produced in the earth by d.c. traction stray currents. In the method the equivalent rail is considered as an earth return circuit. The models of the equivalent rail with current energization and the concept of superposition allow one to consider more complicated d.c. railway systems using a segmental approximation of the complex railway route and taking into account a number of substations and loads at any location. It is assumed in the paper that the system considered is linear, that the earth is homogeneous medium of finite conductivity and that the effects of currents in nearby underground metal installations on the potential generated in the earth by track currents (primary earth potential) can be disregarded. An extensive parametric analysis to examine the roles of various factors, which affect the primary earth potential caused by stray currents, may be performed using simulation program developed. The technical application of the method presented, which can be useful at design stage e.g. of metal structures buried in the stray currents area, is illustrated by examples of computer simulation.

3

Simulation of stray currents generated by DC electric traction

Budnik K., Machczyński W., Szymenderski J.

Poznan University of Technology Academic Journals. Electrical Engineering

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2015

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No. 82

67--76

EN

The paper presents two methods of the 3D simulation of the primary scalar potential of the electric flow field produced in the earth by d.c. traction stray currents. In the first method the equivalent rail is considered as an earth return circuit with distributed parameters, whereas in the second method the rail is treated as a circuit with lumped parameters. It is assumed in the paper that the system considered is linear, that the earth is homogeneous medium of finite conductivity and that the effects of currents in nearby underground metal installations on the potential generated in the earth by track currents (primary earth potential) can be disregarded. An extensive parametric analysis to examine the roles of various factors, which affect the primary earth potential caused by stray currents, may be performed using simulation program developed. The technical application of the method presented, which can be useful at design stage e.g. of metal structures buried in the stray currents

4

Contribution to studies on calculation of D.C. stray currents

Budnik K., Machczyński W., Szymenderski J.

Computer Applications in Electrical Engineering

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2015

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Vol. 13

28--41

EN

The paper presents two methods of the 3D simulation of the primary scalar potential of the electric flow field produced in the earth by d.c. traction stray currents. In the first method the equivalent rail is considered as an earth return circuit with distributed parameters, whereas in the second method the rail is treated as a circuit with lumped parameters. It is assumed in the paper that the system considered is linear, that the earth is a homogeneous medium of finite conductivity and that the effects of currents in nearby underground metal installations on the potential generated in the earth by track currents (primary earth potential) can be disregarded. An extensive parametric analysis to examine the roles of various factors, which affect the primary earth potential caused by stray currents, may be performed using simulation program developed. The technical application of the method presented, which can be useful at design stage e.g. of metal structures buried in the stray currents area, is illustrated by examples of computer simulation.