Abstract
The successive switching of the phases of lines with control of the induced voltage in the phases through three-phase automatic reclosure makes it possible to avoid switching on interphase short circuits, and in 2/3 of the cases of single phase faults, to avoid switching on short circuits in general. By using this method for testing aerial transmission lines it is also possible to avoid switching the three phases onto a short. Here it is unnecessary to make any significant changes in the functional protective circuits. The proposed method can be used on 330–750 kV aerial transmission lines, as well as on 110–220 kV aerial transmission lines that are equipped with phase controlled breakers and voltage transformers.
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