LV generator protection - engineering site - Schneider Electric

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E79475EGSRemote control 2Remote control 1PrioritymotorsPriorityresistive loadsFigure 16: Restarting of priority motors (Σ P > 1/3 Pn).Restarting tips:b if the Pmax of the largest motor > 1/3 Pn, a progressive starter must beinstalled on this motorb if Σ Pmotors > 1/3 Pn, motor cascade restarting must be managed by a PLCb if Σ Pmotors < 1/3 Pn, there are no restarting problems.3.3.3. Non-linear loads - Example of a UPSNon-linear loadsThese are mainly:b saturated magnetic circuitsb discharge lamps, fluorescent lightsb electronic converters:v computer processing systems: PC, computers, etc.v etc.These loads generate harmonic currents: supplied by a Generator Set, this cancreate high voltage distortion due to the low short-circuit power of the generator.Uninterruptible Power Supply (UPS)The combination of a UPS and generator set is the best solution for ensuringquality power supply with long autonomy for the supply of sensitive loads.It is also a non-linear load due to the input rectifier. On source switching, theautonomy of the UPS on battery must allow starting and connection of theGenerator Set.21
Protection and Monitoringof a LV Generator SetE89635E79360EElectrical utilityHV incomerNCMains 1feederMains 2feederNon-sensitiveloadUninterruptiblepower supplySensitive feedersFigure 17: GS-UPS combination for Quality Energy.UPS powerUPS inrush power must allow for:b nominal power of the downstream loads. This is the sum of the apparentpowers Pa absorbed by each application. Furthermore, so as not to oversize theinstallation, the overload capacities at UPS level must be considered (forexample: 1.5 ln for 1 minute and 1.25 ln for 10 minutes).b the power required to recharge the battery: this current is proportional to theautonomy required for a given power. The sizing Sr of a UPS is given by:Sr = 1.17 x Pn.The table below defines the pick-up currents and protection devices for supplyingthe rectifier (Mains 1) and the standby mains (Mains 2).Table: pick-up currents and protection devicesnominal power current value (A)Pn mains 1 with 3Ph battery mains 2 or 3Ph application400 V - l1 400 V lu40 kVA 86 60.560 kVA 123 9180 kVA 158 121100 kVA 198 151120 kVA 240 182160 kVA 317 243200 kVA 395 304250 kVA 493 360300 kVA 590 456400 kVA 793 608500 kVA 990 760600 kVA 1180 912800 kVA 1648 121522
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
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Page 10 and 11: E79360EElectrical utilityHV incomer
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Page 41 and 42: Summary5.1.DiagramA typical example
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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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