LV generator protection - engineering site - Schneider Electric

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Note 2: If there is an MV Set in Production, it may be useful to have one or moreReplacement Sets in LV according to network typology (maintenance of network,Production Set, MV fault, etc.) (maintenance du réseau, du Groupe deProduction, défaut HTA, ...).E79355EMV production setLV replacement setGSGSGSNCLVNCLVNCNC: normally closed.NO: normally open.Figure 4: Block diagram of an MV production GS with LV replacement GS.64060si7
In shortReplacement Set or Safety Set.The same functions are required:ensure continuity of the electricalsupply should the main source fail.However, a Safety Set must satisfyfar more exacting operatingrequirements in order to guaranteesafety of the electrical installation atall costs.The Generator Set andElectrical Distribution1.2.Quality EnergyTo supply sensitive loads (computer, etc.), a quality energy must be implementedthat is free from breaking and with a perfectly regulated voltage.A number of systems can be used to ensure break-free switching. Thesesystems are implemented in the LV system:b reversible synchronous machinethe Set generator is permanently connected to the mains supply:v when operating in the Main function, it operates as a synchronous motor drivingits inertia flywheelv when operating in the Replacement function. When the Mains supply fails, thesynchronous machine, driven by its flywheel, starts to operate as a generator.The Set’s thermal motor starts (off-load) and automatically connects as soon as itreaches its speed at the generator.When the Main source is restored, the Set is then synchronised on the Mainsource, the Main source circuit-breaker closes and the thermal motor isdisengaged and stopped.E79357EElectrical utility networkSNmainsourceSynchronousmachine(compensatoror generator)MagneticcouplingFlywheelThermalmotorNCNCNon-backed upfeedersBacked upfeedersNC: normally closed.NO: normally open.Figure 5: Block diagram of a reversible synchronous machine.This type of solution is not very common as it is relatively expensive toimplement.b generator Set associated with a UPSthe generator set ensures continuity of the electrical supply. Electrical supplyinvolves breaking (from a few minutes to a few seconds). Energy Quality(elimination of outages/brownouts and waveform) is obtained by anUninterruptible Power Supply (UPS) - equipped with a battery- which continuallysupplies sensitive loads in LV.This type of solution is advantageous as it provides sensitive loads with qualityenergy during use on a Main or Replacement source.8
Page 1 and 2: M M M MLow Voltage Expert Guides N
Page 4 and 5: In shortGenerator Sets (GS) are use
Page 6 and 7: ImplementationThe Generator Sets no
Page 10 and 11: E79360EElectrical utilityHV incomer
Page 12 and 13: Replacement SourceThe Set’s purpo
Page 14 and 15: 2.2. Transfer deviceIt is interesti
Page 16 and 17: 2.2.2. SequenceMain source / Genera
Page 18 and 19: 3.1.2. Short-circuit current protec
Page 20 and 21: 3.2. Downstream LV network protecti
Page 22 and 23: E79475EGSRemote control 2Remote con
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Page 27 and 28: Protection and Monitoringof a LV Ge
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Page 31 and 32: The Schneiderprotection solution4.1
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Page 41 and 42: Summary5.1.DiagramA typical example
Page 43 and 44: Summary5.3. Summaryfunctions produc
Page 45 and 46: 6.1. Characteristics tablesof circu
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E887406.2. Control unitscharacteris
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6.2. Control unitscharacteristicsMi
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CTCDCE6.3. Communicationcharacteris
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CD3 CD2 CD1CE6 CE5 CE4CD3 CD2 CD183
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6.3. Caractéristiquesde la communi
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