| Summary: | The article shows that when operating overhead transmission lines in a number of regions, there is a serious problem of the glacial deposits of wires during the autumn-winter period. As a passive measure against the glacial deposits, various wires of increased strength can be used. One of the traditional active methods is the melting of glacial deposits on alternating current lines by creating short circuits or direct current using uncontrolled or controlled rectifier blocks. The development of new means to prevent glacial deposits on the overhead transmission lines consists of the use of combined conversion units capable of performing melting of glacial deposits, if necessary, and the rest of the time compensating for reactive power. The most promising one should recognize the melting of glacial deposits with an ultra-low frequency current that combines the advantages of melting with an alternating current of the industrial frequency (on three wires at the same time) and a DC current (limited only by the active resistance, smooth regulation of the melting current).
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