LOW-VOLTAGE DISTRIBUTION LEAD-IN WIRE PHASE-DIVERTER SWITCH AND UNINTERRUPTIVE POWER CHANGE-OVER METHOD USING THE SAME

摘要

PURPOSE:To perform power switching safely without restriction by time by cutting OFF a lead-in wire from a first power source to a load after providing said lead-in wire with a bypass circuit through a main apparatus and further by momentarily changing from said first power source to a second power source through an electromagnetic switch. CONSTITUTION:Provisional cables 7, 8 and 9 are connected with a bypass electromagnetic switch 4 for a low-voltage distribution lead-in wire phase-diverter switch in the OFF state, and said bypass electromagnetic switch 4 is closed after confirmation of the fact that detected phased, open phase and phase rotation respectively coincide with each other. When a lead-in wire from a first power source is cut OFF, power is supplied from said first power source to a load via a main apparatus. When a diverter electromagnetic switch 5 is operated, the power supply to said load is changed to that from a second power source in an instantaneous time within 1Hz. A power failure less than 1Hz is quite all right practically so that the first power source is changed to the second power source by said diverter electromagnetic switch 5. After that, a permanent wiring is provided between the second power source and the load and the provisional cables 1, 2 and 3 are removed to complete the construction work.