SWER is a single wire transmission line which supplies single-phase electric power from an electrical grid, with all equipment grounded to earth and with the earth used as the return path for the load currents; ! SWER lines have been chosen for rural areas where the loads were small and spread over a wide area, mainly due to the high cost of conventional return current wiring for those areas. Power is supplied to the SWER line by means of an isolating transformer of up to 300kVA.
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