Simulation and Experimental Investigation of DC Ice-Melting Process on an Iced Conductor

Abstract

Ice melting with dc is one of the key technologies to prevent the Chinese power grid from ice storms. Especially after the severe ice storm in the southern part of China in early 2008, dc ice-melting technology has drawn more attention than ever before. However, there are few satisfactory methods to select correct parameters so the ice-melting project rarely achieves desired effects in some cases when applied in Hunan, Guizhou, and other provinces in China. Therefore, it is of great significance to develop a method to estimate parameters which is applicable in the practical situation for dc ice melting. To handle this, the factors, such as wind velocity, ambient temperature, current density and ice-layer thickness were analyzed and then a dc ice-melting model is put forward in this paper. Both the results of simulations and experiments show that the ice-melting process can be divided into three stages composed of temperature rising, ice melting, and ice shedding, among which the ice melting is the key stage consuming most of the ice-melting time. In this stage, an elliptic airgap is formed and widened gradually with an influence on the ice-melting time and the temperature of the conductor. The experiments in the artificial climate chamber demonstrate that the results of the presented model are consistent with those of the experiments generally, so it can be employed to estimate the parameters of ice melting in practical engineering as reference.

DC ice-melting model for wet-growth icing conductor and its experimental investigation

“…By variational calculation, eq. (8) can be expressed as [4,5] According to the Galerkin difference scheme [21], eq. (12) can be expressed as …”

“…DC ice-melting is the most operational deicing technology relative to the others applied to overhead power lines for its advantages including high efficiency of deicing and small power capacity over the AC ice-melting [4]. It is discussed with an emphasis on resisting the icing-accidents of power grid in China after the ice storm of 2008 [5].…”

Experimental Study on the Icing Dielectric Constant for the Capacitive Icing Sensor

“…More seriously, many severe icing disasters on transmission lines have occurred and brought a direct economic loss in Canada, United Kingdom, Iceland, Norway, Russia, China, and some other countries [ 1 , 6 ]. For instance, in the icing disaster that occurred in southern China, in 2008, more than 120,000 transmission towers above 10 kV were damaged, and the direct economic loss was more than twenty billion dollars [ 6 , 7 ].…”

“…According to the field observation, the higher the icing density, the stronger the icing adhesion, and the more serious is the resulting security problem [ 1 , 5 ]. In order to mitigate the grave consequences brought by icing disasters, plenty of researchers and engineers have made both theoretical and experimental studies on the icing growth model, de-icing method, anti-icing method, and of course, the icing detection technology [ 1 , 2 , 3 , 7 , 8 , 9 , 10 , 11 , 12 , 13 ]. Generally speaking, an effective detection technology is the precondition of the de-icing method [ 1 ].…”

Study on the influence of charged glaze on the corona onset voltage of bundle conductor

“…CHINA's landform and climate are so complex that the weather in winter is rich in ice and rain, which threaten the security of the transmission line [1,2]. Glaze produces long icicles which not only change the original form of bundle conductors but also distort its electric field [3].…”