FIELD: electricity.
SUBSTANCE: converting substation for connection of alternating current system to bipolar HVDC supply line of electric power has setting of DC neutral made with the first DC switches allowing to break the first current circuit between neutral bus (111) of one conductor (104) of the above electric power supply line and neutral bus of other conductor (105) at bipolar mode of substation for insulation of failed sector and for switching over to unipolar mode/reverse travel. Setting of DC neutral has at least two first DC switches (133, 136 and 134, 137) on the above first current circuit, which are in-series connected and provided with possibility of functioning as reserve for each other in case some of them will not be able to break the first current circuit for insulation of failed sector owing to switching over from bipolar to unipolar mode.
EFFECT: improving electric power transmission reliability.
13 cl, 4 dwg
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