MELTING METHOD OF GLAZE ICE ON 6( 10 ) kV OVERHEAD TRANSMISSION LINES Russian patent published in 2013 - IPC H02G7/16 

FIELD: electricity.

SUBSTANCE: according to the proposed method, artificial three-phase short circuit (SC) is performed at the end of the overhead transmission line (OTL), voltage is supplied to OTL, phase conductors of OTL are heated with increased current causing glaze ice melting on conductors, and SC is eliminated on OTL after the melting process is completed. At that, accurate adjustment of the melting process is performed to parameters of OTL conductors and glaze ice deposits using a thermal model of conductor and mathematical model of glaze ice melting. Using a switching module, one of three cyclic melting modes, and namely semiautomatic mode, semiautomatic mode with melting depth control, and automatic mode is performed. In the proposed methods, the mode is guaranteed, at which the temperature of the hottest OTL section does not exceed the allowable value. In the automatic mode, melting is performed automatically and continued till glaze ice with the specified parameters is molten. The user has the possibility of following-up the melting process based on melting depth data and design temperature of the hottest conductor, which is received from the melting station.

EFFECT: higher glaze ice melting reliability and safety.

5 cl, 1 dwg