释义 |
three-phase seven-wire system three-phase seven-wire system[′thrē ¦fāz ′sev·ən ¦wīr ′sis·təm] (electricity) System of alternating-current supply from groups of three single-phase transformers connected in Y to obtain a three-phase, four-wire grounded neutral system of higher voltage for power, the neutral wire being common to both systems. |