Distribution of Currents and Voltages, Induced by Electric Field of Three-Phase Overhead Transmission Line along the Grounded Phase/Cable of Disconnected Parallel Power Line

2020 ◽  
Vol 9 (1) ◽  
pp. 31-40
Author(s):  
D. Demchenko ◽  
N. Rubcova ◽  
V. Ryabchenko ◽  
A. Tokarskiy
Keyword(s):  
Electric Field ◽  
Transmission Lines ◽  
Power Line ◽  
Induced Voltage ◽  
Limit Values ◽  
Health Maintenance ◽  
Overhead Transmission Line ◽  
Overhead Transmission Lines ◽  
Three Phase ◽  
Overhead Power Line

The health maintenance of linemen working at overhead transmission lines under induced voltage requires compliance of these voltages’ limit values. To ensure compliance with these requirements have been developed algorithms for calculating of currents and voltages distribution along the grounded phase/cable of disconnected power line, induced by the electric field of operating three-phase overhead power line without transposition, with full and incomplete complete phases transposition section .

scholarly journals Currents and Voltages Induced by Electric Field in Two Converging Single-wire Overhead Transmission Lines

2019 ◽  
Vol 139 ◽  
pp. 01044
Author(s):  
Kirill Zimin ◽  
Nina Rubtsova ◽  
Andrey Tokarskskiy
Keyword(s):  
Electric Field ◽  
Transmission Lines ◽  
Minimal Distance ◽  
Single Wire ◽  
Limit Values ◽  
Overhead Transmission Lines ◽  
Electric Effect

The calculations of induced by electric field voltage and current for i line grounded and ungrounded ends depending on p - line convergence part length, а0 minimal distance between convergence lines, and Θ - the angle of lines convergence. Limit values of р, а0 and Θ are determined, one of which disturbance allows to neglect the electric effect of converging transmission lines.

scholarly journals Inclinometric method for determining the mechanical state of an overhead power transmission line

2019 ◽  
Vol 124 ◽  
pp. 05022
Author(s):  
M.F. Sadykov ◽  
D.A. Yaroslavsky ◽  
D.A. Ivanov ◽  
V.A. Tyurin ◽  
T.G. Galiyeva ◽  
...  
Keyword(s):  
Transmission Line ◽  
Power Line ◽  
Power Lines ◽  
Wire Temperature ◽  
Overhead Transmission Line ◽  
The Status ◽  
Control Devices ◽  
The Wire ◽  
Overhead Power Lines ◽  
Overhead Power Line

Mechanical deformations when a wire is stretched causes its rotation around its axis, which allows obtaining additional information about the wire behavior in an overhead transmission line and considering it no longer as a group of sections from one span but as a whole interconnected section with redistribution of mechanical loads between spans. To determine the tensile strength of wire by its torsion, a method for determining the mechanical parameters of an overhead transmission line was developed. It is based on the inclinometric method and the theory of force calculation of steel ropes. This technique takes into account the torsion, the angle of inclination and the wire temperature. The technique is implemented in the system for monitoring the status of overhead power lines. It takes into account the torsion angle of the wire and helps to prevent emergencies on the overhead power line by determining the tensile strength of the wire, checking for defects in wires of the overhead power line and defects in the suspension armature. The monitoring system includes control devices, data collection and data processing center, a dispatcher software package. Control devices are installed directly on the wire/ground wire of an overhead power line and are used to measure the angle of rotation, the angle of inclination and the wire temperature. The data collection and data processing station processes them according to the developed methodology in specialized software. The system for monitoring the status of overhead power lines based on the inclinometric method helps to prevent emergencies and reduce the economic costs of maintaining and restoring overhead power lines.

Analysis of 50Hz Electric Fields Generated by Multi-Circuit Transmission Lines on the Same Tower

2014 ◽  
Vol 700 ◽  
pp. 67-70 ◽  
Author(s):  
Bin Liu ◽  
Tao Wang ◽  
Fei Gu ◽  
Jie Wei ◽  
Hong Wei Cui ◽  
...  
Keyword(s):  
Electric Field ◽  
Electric Fields ◽  
Transmission Lines ◽  
The Finite Element Method ◽  
Protection Measures ◽  
Overhead Transmission Lines ◽  
Domestic Security ◽  
Phase Sequence ◽  
The Cross ◽  
Security Standards

The finite element method has been applied to calculate the 50Hz electric fields nearby the transmission lines. The electric field strengths nearby multi-circuit transmission lines on the same tower under different arrangement of phase sequence, nearby the cross-arm are calculated. According to the foreign and domestic security standards of 50Hz electric field, the impacts of overhead transmission lines on environment are evaluated and the adoptable measures to reduce electric field strength are proposed. Meanwhile the distributing pattern of the electric field nearby the cross-arm is analyzed and proposals for further protection measures during maintenance operation are provided.

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