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IllustrationDescription5.3.1 PEAK LOPPING. A more advanced variation of the peaklopping system described above is to use a556 or an RS485 enabled 555 load controlmodule with an external device (such as a<strong>PLC</strong> and a kW transducer), variable PeakLopping can be achieved.The 556 or the <strong>PLC</strong> will monitor the siteload levels and vary the generators powerproduction. This can be used to ensure theset is used at it’s most economic load level,and prevents the system exporting power.NOTE: - It is recommended that ROCOF (Rate of change of frequency) or vector shiftdetection components are fitted when paralleling a generating set with the mains.Additional equipment of this type is normally specified by the local electricity SupplyCompany to protect against the generator feeding the mains grid in the case of a mainsfailure. If in doubt, you should refer to your local Electricity Supply Company for advice.16DSE Guide to Synchronising & Load Sharing PART 1 ISSUE5 18/3/04 AM
6 MULTIPLE GENERATORSThere are many reasons for requiring more than one generator on the same site.The most commons reasons are described below:Illustration6.1 MUTIPLE SET PRIMEPOWERDescriptionIn this example, the site has four generating sets, used asthe primary power source.One genset will be running all the time, to provide power tothe site. If the load demand of the site increases, one ormore generators will be automatically called to start. Theywill then synchronise onto the bus, and provide power inparallel with the other set(s). At this point, the setsconnected to the bus will share the load, normally utilisingload sharing equipment.Using multiple generating sets rather than one large setallows for maintenance to be performed on one of the setswhile the other set(s) are still available for duty.Additionally, if load demands are low, individual generatorscan be started as required, rather than one large generatorbeing used at (for instance) only 25% of its full load rating.If the overall size of the load increases, for instance due tofactory expansion another set can be added to increasecapacity with minimal disruption to the rest of the system.Using this system, “redundancy” can be built in by utilisinga larger number of gensets than is required to supply theload. This way, the load can still be supplied if one or moresets are unavailable due to engine failure or maintenance.The 550 controllers have “no master” ensuring a seamlesstransition when one or more sets are removed from thesystem.DSE Guide to Synchronising & Load Sharing PART 1 ISSUE5 18/3/04 AM 17
Page 1 and 2: DEEP SEA ELECTRONICS PLCGuide to Sy
Page 3 and 4: SectionTABLE OF CONTENTSPage1 BIBLI
Page 5 and 6: 18.3.1 MULTISET SETTINGS (NOT APPLI
Page 7 and 8: 3.1 CLARIFICATION OF NOTATION AND T
Page 9 and 10: 4.2 SINGLE SET NO BREAK RETURN WITH
Page 12 and 13: 4.5 MULTIPLE SET STANDBY TO MAINS S
Page 15: 5.2 CONTINUOUS PARALLEL OPERATIONEl
Page 19 and 20: Illustration6.3 MULTIPLE SETS (STAN
Page 21 and 22: 8 THE NEED FOR SYNCHRONISINGBefore
Page 23 and 24: 10 REQUIREMENTS FOR SYNCHRONISATION
Page 25 and 26: 10.3 55X CONTROLLER10.3.1 FUNCTION
Page 27 and 28: 10.3.3 AUTOMATIC SYNCHRONISINGAutom
Page 29 and 30: 11 LOAD SWITCHING DEVICESThe parall
Page 31 and 32: 12.3 CONNECTION DETAILSConnection t
Page 33 and 34: 12.3.4 LOCATION OF SW1 AND SW2 SELE
Page 35: 13.3 CONNECTION DETAILSConnection t
Page 38 and 39: 13.4.4 LOCATION OF SW1 AND SW2 SELE
Page 41 and 42: 15 55X MULTISET COMMUNICATIONS LINK
Page 43 and 44: NOTE: - Only the “end” modules
Page 45 and 46: 16 55X CONTROLLER CONFIGURATION FOR
Page 47 and 48: 16.2 AUTO SYNC SETTINGSGenerator Au
Page 49 and 50: Generator AutoSynchronising Setting
Page 51 and 52: Multi-set settingsFunctionMultiset
Page 53 and 54: 17.2 LOAD CONTROL(Only available on
Page 55 and 56: 18 ON SITE COMMISSIONING18.1 DISABL
Page 57 and 58: 18.3 55X CONTROLLER COMMISSIONING A
Page 59 and 60: 18.3.2 VIEWING THE 55X SYNCHROSCOPE
Page 61 and 62: 18.3.4 FREQUENCY SYNCHRONISER SETUP
Page 63 and 64: 18.3.5 VOLTAGE MATCHING SETUPSynchr
Page 65 and 66: Load Level SettingsFunctionLoad par
Page 67 and 68:
19 TYPICAL CONNECTIONS19.1 TYPICAL
Page 69 and 70:
19.3 TYPICAL CONNECTIONS FOR A 556T
Page 71:
20 APPENDICES20.1 530 AS MAINS / GE
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