DEEP SEA ELECTRONICS PLC - Home Mega Global Solution

4.6 MULTIPLE SET STANDBY TO MAINS SUPPLY (NO BREAK RETURN)Two or more sets are used to provide backup to the mains supply. When the mains supply fails,the sets are started, synchronised and paralleled together. The generators bus is then closed tofeed the load, the sets sharing power equally as a percentage of their full load rating. Sets areautomatically started and stopped depending upon load levels allowing economic use of theavailable generators. When the mains supply returns, there will be NO break in supply to the loadwhile a ramped transfer takes place.Controller :Governor :AVR :Load Shareoptions :Description550 load sharing controller.DroopInterfacemethodDroopInterfacemethodP120 analogue governorinterface• Load share kW.• Load share kVArP121 analogue AVRinterfaceA DSE 556 controller is connected to the 550load share models via the Multi SetCommunications (a total of sixteen 550s andone 556 can be connected together).A DSE 556 controller will monitor the mainssupply and signal all available sets to startshould the supply failAll available sets will start and after theminimum number of sets have successfullyparalleled with each other, the 556 will transferthe load to the generator bus.The generators will then share the load usingtheir load sharing communications link, setsbeing stopped / started depending upon loaddemands (if enabled)Upon mains restoration, the 556 controller willsynchronise the generator bus to the mainsand ramp the load back to the mains. The setsare then instructed to cool down and stop.DSE Guide to Synchronising & Load Sharing PART 1 ISSUE5 18/3/04 AM 13