Influence of EMF induced by currents of overhead lines on RMS value of ice-melting current

2015 ◽  
Author(s):  
Nikolay Korovkin ◽  
Valeriy Goncharov ◽  
Nikolay Silin
Keyword(s):  
Ice Melting ◽  
Overhead Lines ◽  
Melting Current

Research and Validation on Melting Ice of Overhead Transmission Line

2014 ◽  
Vol 543-547 ◽  
pp. 653-657
Author(s):  
Ye Zhou Hu ◽  
Shao Feng Yu ◽  
Lin Zhang ◽  
Pai Liu
Keyword(s):  
Transmission Line ◽  
Research Capacity ◽  
Ice Thickness ◽  
Ice Melting ◽  
Technology Research ◽  
Current Generator ◽  
Overhead Lines ◽  
Overhead Transmission Line ◽  
Temperature And Humidity

In order to further grasp the overhead rules of transmission line de-icing, this thesis designed and developed a newly transmission line icing apparatus, which can acquire the needed ice thickness covered upon a certain transmission line in laboratory. Combined with the walk-in temperature and humidity box, the temperature tester, current generator and other equipment, enhance the technology research capacity of overhead lines ice-melting. And the software can simulate the overlying ice temperature and cloud distribution changes with time, verify the line ice-melting rules. The method can be easily extended to other types of wires, and has certain application value.

Analysis of Ice Melting System

2014 ◽  
Vol 698 ◽  
pp. 710-715
Author(s):  
Olga Akhmedova ◽  
Anatoly Soshinov
Keyword(s):  
Power Systems ◽  
Integrated System ◽  
Wind Loads ◽  
Ice Melting ◽  
Electric Networks ◽  
Overhead Lines ◽  
Regions Of Russia

The problem of preventing icing accidents in electric networks of power systems is relevant in many regions of Russia. Disruptions of overhead lines, caused by intensive icing and icing and wind loads are most severe in their effects. However, the devastating effect of icing is not fatal. This is confirmed by the experience of power systems, systematically carrying on a struggle against ice. Prevention of icing accidents is based on the use of an integrated system of activities in a systematic manner.

scholarly journals Thermodynamic model of critical ice-melting current on iced transmission lines

2019 ◽  
Vol 23 (5 Part B) ◽  
pp. 3187-3198
Author(s):  
Yong-Can Zhu ◽  
Xin-Bo Huang ◽  
Long Zhao ◽  
Yi Tian ◽  
Jing-Yu Mu ◽  
...  
Keyword(s):  
Transmission Lines ◽  
Heat Conductivity ◽  
Liquid Water Content ◽  
Attack Angle ◽  
Ice Storm ◽  
Ice Melting ◽  
Joule Effect ◽  
Current Increase ◽  
Simulation And Experiment ◽  
Melting Current

The thermal de-icing by Joule effect is a mostly valid way to prevent transmission-lines from the severe ice storm. A model was put forward to simulate the critical ice-melting current on iced conductor. Based on this model, the value of critical ice-melting current was calculated with various parameters, some of which were ignored in the earlier literatures, such as ice-layer heat conductivity, wind attack angle, and icing section shape. The results of the experiment and simulation show that the critical ice-melting current increase with wind speed, wind attack angle, and ice-layer heat conductivity, but decrease rapidly with ambient temperature and liquid water content. Moreover, the maximum difference between the results of simulation and experiment is about 9%, thus this model can be employed to estimate the engineering parameters in practical thermal de-icing projects.

Influence Estimation of the On-Load Tap-Changing Transformeron the Currents in Schemes of Ice Melting on Overhead Transmission Lines

2020 ◽  
Vol 63 (5) ◽  
pp. 86-90
Author(s):  
Alexander Zasypkin (jr.) ◽  
Keyword(s):  
Transmission Lines ◽  
Short Circuit ◽  
Linear Interpolation ◽  
Ice Melting ◽  
Imped Ance ◽  
Technical Data ◽  
Melting Current ◽  
Transformer Ratio ◽  
Current Calculation ◽  
Dc Current

The influence of regulated under load transformer's (on-load tap-changing transformer) ratio and imped-ance on the short circuits’ currents and currents in the schemes of ice melting with AC and DC current is ana-lyzed. Accounting for changes in the transformer ratio is not difficult as it is provided in the technical data for all branches (tap positions). The transformer resistances used in the calculations, which are reduced to the un-regulated side of the transformer, are proportional to the short-circuit (SC) voltages. SC voltages are known, according to GOST, only for three tap positions - main (middle) and two extreme (top and bottom) positions, and for other tap positions are determined approximately according to different methods. It is shown on the typical example, that the error of the melting current calculation is significantly less than the error of the ap-proximated transformer's resistance calculation by the method of linear interpolation of resistances, the error of which for different types of on-load tap-changing transformers does not exceed 3 %.

PORE-SCALE SIMULATION OF ICE MELTING PROCESS IN POROUS MEDIA

2017 ◽  
Author(s):  
Pu He ◽  
Li Chen ◽  
Yu-Tong Mu ◽  
Wen-Quan Tao
Keyword(s):  
Porous Media ◽  
Melting Process ◽  
Pore Scale ◽  
Ice Melting

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.

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