Abstract
Ice melting by electric current on overhead power lines in ice areas – the main way of prevention of ice accidents. For creation of the required current is used the electric power from electrical power system to which installations of ice melting are connected to high voltage power lines – rectifiers. The overhead power line during the melting is disconnected from the network, while power losses in the network are increasing. The switch-off time required to assemble the melting circuit, disassemble it after melting and switching-on in the network, can significantly exceed the melting time. Thus, in addition to the electric power consumption for melting, it is necessary to consider additional losses in the network from current of melting and losses arising in network when the trunk line is disconnected. The total expense of the electric power is subject to minimization that isn`t considered now in Programs of ice melting. A coefficient of accounting of additional losses in the electrical network during ice melting is proposed. Recommendations about the selection of current of ice melting on an overhead power transmission line, depending on operating mode of the electrical network are given.
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