| The galloping and deicing oscillation of conductor on overhead line will direct threat the safety of overhead transmission lines, which is concerned by the engineer in transmission line engineering. The aluminum conductor composite core (ACCC) is a kind of new scientific and technological products with good application prospect. It has obvious advantages compared with the traditional aluminum conductors steel-reinforced (ACSR). However, the research on the ACCC is still very inadequate, due to its mechanical properties, such as stiffness, elastic coefficient, quality and so on, has great difference with ACSR. Therefore, the study of galloping stability and deicing oscillation characteristics of ACCC is very important for the application of ACCC.In this paper, the aerodynamic parameters of typical iced ACCC conductor are studied. The galloping stability under typical icing conditions is discussed. A set of overhead line deicing oscillation experimental system is developed. Three kinds of experiments are carried out include whole span synchronous ice shedding, partial span synchronous ice shedding, sequential ice shedding. The ice-shedding vibration characteristics of ACCC under different working conditions were studied, and the vibration characteristics of ACCC and ACSR with same parameters are compared.The specific researches are as follows:1) The aerodynamic characteristics of the ACCC with crescent-shape icing and D-shape icing are analyzed in detail. The variation of aerodynamic parameters with different incidence, wind speed and icing thickness is given. The aerodynamic coefficient curve about stability of ice galloping is given through fitting of the aerodynamic parameters. The galloping stability of ACCC under typical icing conditions is discussed, and the unstable region is presented.2) According to the requirement of deicing oscillation experiment, a set of overhead lines and deice oscillation experiment system is developed. The overall system structure and control system is designed. The millisecond time control system is developed which can conduct synchronous or sequential deicing experiment in arbitrary time series combination.3) The FEM simulation and experimental method are used to research the dynamic tension of isolated span ACCC in the condition of whole span ice shedding, partial span ice shedding and unzipping sequential ice shedding. The influence of deicing position, deicing sequence and deicing speed on the dynamic tension are studied, and compared with the corresponding ACSR results.4) The oscillation displacement character dynamic tension of ACCC in the condition of whole span ice shedding, partial span ice shedding and unzipping sequential ice shedding. The influence of deicing position, deicing sequence and deicing speed on the oscillation displacement character are studied, and compared with the corresponding ACSR results. |
