scholarly journals CALCULATION OF POWER LINE FIELDS BETWEEN CIRCULAR CONDUCTORS

2012 ◽  
Vol 04 (01) ◽  
pp. 1250025
Author(s):  
ANDREW SEAGAR ◽  
SALAKCHIT NILBOWORN
Keyword(s):  
Electric Field ◽  
Transmission Lines ◽  
Power Transmission ◽  
Circular Cross Section ◽  
Low Frequency ◽  
Test Cases ◽  
Power Transmission Lines ◽  
System Matrix ◽  
High Voltage Direct Current ◽  
Frequency Components

It is important to calculate the electric field at the surface of high voltage direct current power transmission lines, since it is this field which governs the onset of corona discharge and the power loss arising therefrom. A method is presented here to calculate the electric field based on an implementation of the boundary element method for conductors of strictly circular cross section. Given the circular geometry it is possible to resolve all integrals involved analytically. A Galerkin approach is adopted, giving the solution in the spatial frequency domain. That allows a controlled truncation of the system matrix by choice of which frequency components to keep. It transpires that the low frequency components are the most important ones. Two test cases are used to quantify the accuracy of the solution with respect to truncation and distance from the surface. It is found that the accuracy increases with distance from the surface, but for all distances can be controlled by choosing an appropriate level of truncation.

scholarly journals Quantitative Analysis of Plant Growth Exposed to Electric Fields

2015 ◽  
Vol 16 (2) ◽  
pp. 207
Author(s):  
Hussein Ahmad ◽  
Mohd Hafizi Ahmad ◽  
Noor 'Aliaa Awang ◽  
Izzah Hazirah Zakaria
Keyword(s):  
Quantitative Analysis ◽  
Electric Field ◽  
Electric Fields ◽  
High Voltage ◽  
Transmission Lines ◽  
Power Transmission ◽  
Germination Rate ◽  
Power Transmission Lines ◽  
High Power Transmission ◽  
Electromagnetic Radiations

<p>Electromagnetic radiations present in the environment has a profound effect on the growth of vegetable plant primarily grown under the high power transmission lines. The high electric field generated due to ultra high voltage causes the increase and reduction in the size of the plants. Numerous research have been carried out to investigate the effect of electric field on the plants. However, the knowledge in term of quantitative analysis on the effect of electric field on the growth of vegetables is not entirely understood. Thus, this paper presents a study conducted to investigate the effect of high voltage DC electric fields on the young vegetables growth namely ‘Choy Sam’ and bean sprout. The experimental setup was designed which composed of two parallel plate electrodes. This research was focused on the percentage of germination and growing rate of young vegetables. The growth of the young vegetables during exposure was calculated by using statistical methods. The analysis of the results showed that the electric fields and the electric fields treated water have influenced the germination rate and height of stems of both young vegetables causing the increase in stem height.</p><p> </p>

Study on Dynamic Simulation of 4-Bundle Ice-Coated Conductor Galloping Based on 3-D Model

2011 ◽  
Vol 105-107 ◽  
pp. 474-477
Author(s):  
Shi Jing Wu ◽  
Zeng Lei Zhang ◽  
Zhen Hao Liu ◽  
Ji Cai Hu
Keyword(s):  
Transmission Lines ◽  
Power Transmission ◽  
Low Frequency ◽  
Element Model ◽  
Wake Flow ◽  
Power Transmission Lines ◽  
Ansys Software ◽  
Frequency Coupling ◽  
D Model ◽  
The Finite Element Model

Galloping of power transmission lines is a low frequency self-oscillation with large amplitude. The aerodynamic effect on each sub-conductor of 4-bundle conductor is different due to wake-flow-influence. In order to explore the reasons leading to galloping, a 3-D model for power transmission line is built. A two-node quadratic beam element in 3-D and a structure mass element are applied to establish the finite element model of iced 4-bundle conductor in ANSYS software. Then dynamic transient response calculations are made on this model. According to the results, difference in vibration of sub-conductors and frequency coupling of torsional and transverse vibration can be confirmed. The simulation results illustrate the wake-flow-influence effect and the coupled motions effect on galloping of 4-bundle conductor.

Influence of Icing to the Corona Loss Characteristics of the AC Power Transmission Lines

2013 ◽  
Vol 385-386 ◽  
pp. 1112-1116
Author(s):  
Jun Zhu ◽  
Zi Qiang Xu ◽  
Qing Zhong Geng ◽  
Yun Peng Liu ◽  
Jiang Hai Geng
Keyword(s):  
Electric Field ◽  
Transmission Line ◽  
Transmission Lines ◽  
Power Transmission ◽  
Experimental Results ◽  
Power Transmission Lines ◽  
Ac Power ◽  
Test Platform ◽  
Surface Electric Field ◽  
Simulation Results

The transmission line corridor will inevitably cross the icing area in China. Icing will influence the corona characteristics of transmission lines. In order to deeply analyze the influence law of the icing to corona loss characteristics, an icing test platform that can be utilized to simulate icing conditions was built. Icing test was done in the corona cage of 1.8m×1.8m×4m. Through changing the conductivity of freezing water and the length of icicle, corona loss of the icing conductor was measured and the surface electric field was also simulated with the software ANSYS. The results show that the length of icicle is an important factor affecting the corona loss of the AC conductor and the conductivity of freezing water on that impact is not obvious. Owing to the icicles, the distortion of the conductor electric field is serious. With the increase of icicle length, conductor corona loss value increases significantly. When the length of icicle increases to about 18mm, the increase of the corona loss value is no longer obvious trending to be saturated . The simulation results coincided with the experimental results very well.

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