FIELD: power transmission to users. SUBSTANCE: distribution mains has power supply; three-wire line connected to the latter; isolating transformer whose primary windings are connected in star and secondary ones, in open delta, one of windings being differentially connected to two others; single-wire power transmission line connected to one of open-delta terminal leads; single- phase step-down transformer on user's end. EFFECT: facilitated organization of mains affording reliable power supply under normal and abnormal conditions. 1 cl, 2 dwg
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