Simulation of the ice accretion process on a transmission line cable with differential twisting

2007 ◽  
Vol 34 (2) ◽  
pp. 147-155 ◽  
Author(s):  
Ping Fu ◽  
Masoud Farzaneh
Keyword(s):  
Transmission Line ◽  
Computer Modelling ◽  
Air Pressure ◽  
Ice Accretion ◽  
Validity And Reliability ◽  
Overhead Transmission Line ◽  
Accretion Process ◽  
Ice Loads ◽  
Modelling Methods ◽  
Modelling Simulation

Cable rotation caused by ice accretion was specifically modelled and simulated for this paper. Both ice loads and wind-on-ice loads were taken into account during the modelling, and the quantity for the wind-on-ice loads was obtained by integrating air pressure and air shear along the airflow boundary. Air pressure and air shear were both evaluated through time-dependent airflow computations. Two types of overhead transmission line cables, namely, the Bersimis cable and an overhead ground wire, were examined using the new model, and a number of conclusions were drawn. The validity and reliability of the modelling methods were confirmed by comparing the simulation results with those obtained from experimental measurements.Key words: airflow computation, cable rotation, ice accretion, computer modelling, simulation.

The Construction and Development of Comprehensive Test Centre Based on Real Transmission Line

2013 ◽  
Vol 330 ◽  
pp. 163-171
Author(s):  
Xiao Hui Yang ◽  
Dong Yan ◽  
Yu Sheng Zheng ◽  
Xiao Kuo Kou
Keyword(s):  
Transmission Line ◽  
Transmission Lines ◽  
Low Frequency ◽  
Line Length ◽  
Ice Accretion ◽  
Overhead Transmission Line ◽  
Function Design ◽  
Comprehensive Test ◽  
Grid Operation ◽  
Natural Climate

Galloping of overhead transmission line is a low-frequency, large amplitude, wind-induced vibrations of both single and bundle of overhead transmission lines, which have been one of the largest threaten for the security and stability of power grid operation. On account of the uncertainty and probability of galloping events happening, most of the study on transmission line galloping had still stayed on simulation or model test, only less of the study were in accordance with the accident records on-site. Several ten years study on conductor galloping had been proved that the laboratory built on real transmission line was the essential foundation and the effective condition for the systemic study on galloping. Comprehensive Test Centre based on Real Transmission Line (CTC for short) is the first laboratory focus on the study of conductor galloping and ice-accretion. whose content of tower type,conductor arrangement and transmission line length, currently have been the most abundant in worldwide. The establishment of the Comprehensive test centre have been very important on promoting the fundamental and systemic study in the relative field. Since the frequent conductor galloping under the condition of natural climate achieved successfully, CTC have developed several essential and valuable scientific projects. In this paper, CTC would be introduced from the aspects of basic facilities configuration, mainly function design and implementation, focal capabilities and some study outcomes at moment.

Extreme Weather Loading Risk Model of Overhead Transmission Line

2011 ◽  
Vol 383-390 ◽  
pp. 2005-2011
Author(s):  
Yu Sun ◽  
Xiu Li Wang
Keyword(s):  
Transmission Line ◽  
Risk Model ◽  
Economic Loss ◽  
Interference Theory ◽  
Short Term ◽  
Risk Margin ◽  
Overhead Transmission Line ◽  
Design Loads ◽  
Ice Loads ◽  
Line Design

Power grid suffers tremendous economic loss in extreme ice disaster weather, suggesting that it lacks immediate precautionary system. On the basis of the standards of Q/GDW179-2008 and IEC60826-2003, the curve of transmission line design loads is built up. In view of ransom character for load-strength of transmission line, according to load-strength interference theory, a short-term wind and ice loading risk model is established, which is a time-dependent wind and ice loading model, and can be calculated unreliability probability and fault rate, showing risks about cluster fault and common fault. Furthermore, wind and ice loads are divided into five states, which show risk margin of loads. It also can provide precautionary information for operator, and can present risk measurement on time scale.

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