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 %.

Mathematical Model of Ice Melting on Transmission Lines

2006 ◽  
Vol 6 (2) ◽  
pp. 273-286 ◽  
Author(s):  
S. Yu. Sadov ◽  
P. N. Shivakumar ◽  
D. Firsov ◽  
S. H. Lui ◽  
R. Thulasiram
Keyword(s):  
Mathematical Model ◽  
Transmission Lines ◽  
Ice Melting

Analysis on De-Icing Methods for 4-Bundle 500kV Transmission Lines

2013 ◽  
Vol 694-697 ◽  
pp. 790-794
Author(s):  
Shun Xin Liu ◽  
You Han Guo
Keyword(s):  
Transmission Line ◽  
South China ◽  
Transmission Lines ◽  
Research Direction ◽  
Development Trend ◽  
Ice Melting ◽  
Power Networks ◽  
Advantages And Disadvantages ◽  
Prevention And Treatment ◽  
The Development Trend

In view of the massive transmission lines suffered disaster of ice coating at the beginning of 2008 in south China. In this paper, several typical schemes for the prevention and treatment of ice coating occurred in power networks home and abroad are analyzed. Common melting ice methods can be divided into three kinds: thermal ice-melting, mechanical de-icing and new de-icing. This paper describes a 500 kV transmission line and analyses each of these measures briefly. At the same time, the advantages and disadvantages of various measures and their applications were summarized. At last, the development trend and the research direction were pointed out．

A New High Voltage Transmission Lines Deicer Based on Vibrations Principle

2013 ◽  
Vol 772 ◽  
pp. 604-607
Author(s):  
Jing Nie
Keyword(s):  
High Voltage ◽  
Transmission Lines ◽  
Social Benefits ◽  
Lead Wire ◽  
Ice Melting ◽  
Paper Briefly ◽  
Basic Principles ◽  
High Voltage Transmission Line ◽  
Pros And Cons ◽  
High Voltage Transmission

In recent years, for the high voltage transmission lines suffered serious Icing lead wire dancing, break and tower collapsed, domestic and foreign strengthened the study of high-voltage overhead line deicing methods and put forward a variety of line deicing methods. This paper first introduced thermal ice-melting method, mechanical deicing method, natural deicing method and several common deicing methods and analyzed the pros and cons of various deicing program. Based on the analysis of deicing methods for the high voltage transmission lines, a new and simple high voltage transmission line deicer is brought forward. This paper briefly discussed the basic principles and advantages of the device, providing a new way of thinking for the high voltage transmission lines deicing and having a certain value and social benefits.

Sign in / Sign up

Export Citation Format

Share Document