LV generator protection - engineering site - Schneider Electric

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In shortGenerator Sets (GS) are used in HVand LV electrical distribution.In LV they are used as:b replacement sourceb safety sourceb sometimes as a ProductionSource.When the need for Energy Quality isessential, the Generator Set isassociated with an UninterruptiblePower Supply (UPS).The Generator Set andElectrical DistributionUsers’ LV electrical distribution is normally supplied by an electrical utility bymeans of HV/MV and MV/LV voltage transformers.To ensure better continuity of the electricity supply, the user can implement adirect supply from an independent thermal source (Generator Set or GS) as aReplacement source. On isolated sites or for economic reasons, he can use thisenergy source as the Main source.This Generator Set mainly consists of:b a thermal motorb a generator converting this mechanical energy into electrical energyb an electrical cubicle performing the excitation regulation and control/monitoringfunctions of the various Generator Set components (thermal and electrical).Generator Set installation must conform to installation rules and satisfy the safetyregulations applicable to the premises on which they are installed or to theequipment that they are intended to supply.The Protection Plan and Monitoringof downstream LV distribution mustbe defined specifically taking thegenerator characteristics intoaccount.3
The Generator Set andElectrical Distribution1.1.The 2 applicationsAccording to the application - Main electrical power supply source (ProductionSet) or Replacement source of the Main source - the sizing characteristics of theGenerator Sets vary (power, output voltage, MV or LV generator, etc.).1.1.1. Replacement energyPrincipleAs a Replacement source, the Generator Set operates only should the mainssupply fail.Mains failure can be due to:b a random cause: fault on the networkb a voluntary cause: placing the network out of operation for maintenancepurposes.OperationIn the Replacement source function, the Generator Set supplies the loads via asource changeover switch.As operation is exceptional, the Generator Set is sized strictly to supply thepower P required. The power of these Generator Sets is rarely greater than anMVA. The power of the Replacement source LV Generator Sets ranges typicallyfrom 250 to 800 kVA.E79478EMVMainsourceNCLVNOGSReplacementsourceNC: normally closed.NO: normally open.Figure 1: Replacement source GS.4
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LV generator protection - engineering site - Schneider Electric

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