Modified Fourier transform lightning surge analysis of an overhead line-underground coaxial (CV) cable system Part I. Modal analysis of underground cables and overhead lines and effect of subterranean water on cable modal propagation characteristics

1994 ◽  
Vol 31 (1) ◽  
pp. 31-42
Author(s):  
Mohamed A.A. Wahab ◽  
Kenji Matsuura
Keyword(s):  
Fourier Transform ◽  
Modal Analysis ◽  
Overhead Line ◽  
Propagation Characteristics ◽  
Cable System ◽  
Underground Cables ◽  
Overhead Lines ◽  
System Part ◽  
Subterranean Water

Modal Analysis of the Line Inspection Robot's Manipulator

2014 ◽  
Vol 681 ◽  
pp. 100-105
Author(s):  
Jian Li ◽  
Xu Dong ◽  
Zhong Cai Zheng ◽  
Yan Gao ◽  
Zhen Ting Jiang ◽  
...  
Keyword(s):  
Modal Analysis ◽  
Theoretical Basis ◽  
Three Dimensional ◽  
Robot Arm ◽  
Overhead Line ◽  
Post Processing ◽  
Low Frequencies ◽  
Overhead Lines ◽  
Inspection Robot ◽  
Three Dimensional Models

The Line Inspection Robot is used to detect the line's defects when it walks on the overhead lines. It will be swinging under its own vibration and the action of wind , due to the robot arms hanging on overhead line alone ,so the dynamic characteristics of robot arm cannot be ignored. In this paper, we establish three-dimensional models of the line inspection robot's manipulator with double manipulators of antisymmetric structure, and conduct solving and post-processing of statics and modal analysis after meshing and applying constraints. The manipulator's low frequencies and vibration modals are drawn, so we can provide a theoretical basis for the reasonable optimization improvements to the line inspection robot's manipulator with double manipulators of antisymmetric structure.

The choice of optimum cross section for overhead line by economic intervals' method

2011 ◽  
Vol 28 (1) ◽  
pp. 37-42 ◽  
Author(s):  
Svetlana Guseva ◽  
Lubov Petrichenko
Keyword(s):  
Cross Section ◽  
Current Density ◽  
Uncertain Information ◽  
Overhead Line ◽  
Market Conditions ◽  
Overhead Lines ◽  
Mathcad Software

The choice of optimum cross section for overhead line by economic intervals' methodIn this paper an approach to choosing the optimum cross section for overhead line in conditions of incomplete and uncertain information is considered. The two methods of such choice are presented: method of economic current density and economic intervals' method. The correction of the economic intervals method is offered under market conditions of costs. As example 20 kV and 110 kV overhead lines with aluminum, copper and ferroaluminum wires are selected. Universal nomograms with different standard cross section are calculated and constructed. The graphics using Mathcad software are offered.

scholarly journals Photovoltaic Maximum Penetration Limits on Medium Voltage Overhead and Underground Cable Distribution Feeders: A Comparative Study

Energies ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3843
Author(s):  
Sultan Sh. Alanzi ◽  
Rashad M. Kamel
Keyword(s):  
Power System ◽  
Power Factor ◽  
Distribution System ◽  
Power Flow ◽  
Underground Cables ◽  
Overhead Lines ◽  
Medium Voltage ◽  
Load Power ◽  
Bus Voltage ◽  
Pv Penetration

This paper investigates the maximum photovoltaic (PV) penetration limits on both overhead lines and underground cables medium voltage radial distribution system. The maximum PV penetration limit is estimated considering both bus voltage limit (1.05 p.u.) and feeder current ampacity (1 p.u.). All factors affect the max PV penetration limit are investigated in detail. Substation voltage, load percentage, load power factor, and power system frequency (50 Hz or 60 Hz) are analyzed. The maximum PV penetration limit associated with overhead lines is usually higher than the value associated with the underground cables for high substation voltage (substation voltage = 1.05 and 1.04 p.u.). The maximum PV penetration limit decreases dramatically with low load percentage for both feeder types but still the overhead lines accept PV plant higher than the underground cables. Conversely, the maximum PV penetration increases with load power factor decreasing and the overhead lines capability for hosting PV plant remains higher than the capability of the underground cables. This paper proved that the capability of the 60-Hz power system for hosting the PV plant is higher than the capability of 50 Hz power system. MATLAB software has been employed to obtain all results in this paper. The Newton-Raphson iterative method was the used method to solve the power flow of the investigated systems.

Study on Reasons of the Falling of the Overhead Line Based on Fault Tree Analysis

2013 ◽  
Vol 325-326 ◽  
pp. 590-593
Author(s):  
Fei Xiang Wei ◽  
Yang Song ◽  
Xiao Xu Ma ◽  
Ying Qian
Keyword(s):  
Power System ◽  
System Reliability ◽  
Fault Tree ◽  
Fault Tree Analysis ◽  
Power System Reliability ◽  
Overhead Line ◽  
Qualitative And Quantitative Analysis ◽  
Tree Analysis ◽  
Overhead Lines ◽  
Qualitative And Quantitative

The transmission line is an important part of the power system, its reliability will directly affect the reliability of the power system. The reliability of the overhead line plays a crucial role for the power system reliability. This paper analyze the reasons of the falling of the overhead lines, establish a fault tree, and make qualitative and quantitative analysis of the fault tree.

scholarly journals Overhead Transmission Line Sag Estimation Using the Simple Opto-Mechanical System with Fiber Bragg Gratings—Part 2: Interrogation System

Sensors ◽  
2020 ◽  
Vol 20 (9) ◽  
pp. 2652 ◽  
Author(s):  
Krzysztof Skorupski ◽  
Damian Harasim ◽  
Patryk Panas ◽  
Sławomir Cięszczyk ◽  
Piotr Kisała ◽  
...  
Keyword(s):  
Fiber Bragg Grating ◽  
Bragg Grating ◽  
Optical Parameters ◽  
Overhead Line ◽  
Exact Matching ◽  
Small Shift ◽  
Optomechanical System ◽  
Overhead Lines ◽  
Overhead Transmission Line ◽  
Experimental Part

This article presents the use of a sensor with fiber Bragg grating along with an interrogation system used for monitoring the overhead lines’ wire elongation. The possible interrogation methods based on adjusted filters were considered. In the experimental part, three types of fiber Bragg grating pairs, characterized by a small shift in spectra in pairs and gratings with exact matching, were examined. The study showed that, by choosing the appropriate mechanical parameters of the elongation transformer with the optical parameters of the sensor and dedicated filter, the optomechanical system can be adjusted to the required range of overhead line wire sag observation. The range of sag depends on the distance between the poles, the wire type, and its real length in the span, which effectively determines the sag.

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