LV generator protection - engineering site - Schneider Electric

More documents

Recommendations

Info

4.3.1.2. Source Ground Return (SGR)The “Source Ground Return” system directly measures the earth fault current bya specific external sensor.This protection detects faults upstream and downstream of the circuit-breaker.It is only possible at the supply end of the LV installation.E88019 E88018Figure 33.Note: the SGR CT is specific to this application.The Ground protection and Neutral protection are separate and thus can becombined.Setting the protection devicesGround protection can be set for its threshold (limited to 1200 A) by 9 bands andby its time delay (same as the Short Time Delay).To enhance discrimination with fuses or other circuit-breakers, part of the groundprotection curve can be converted into a reverse curve by choosing the l 2 tONsetting.The SGR protection requires use of the MDGF module.4.3.2. Residual current device (RCD) protection or“zero sequence” systemRCD protection is stipulated by installation standards (IEC 60 364) for protectionof people and equipment in the following cases:b TT type grounding systems, in which currents resulting from insulation faultsare smallb TN-S type networks with very long cables, in which the instantaneous thresholdis not sufficient to protect a short-circuit at the end of the lineb IT networks with very long cables.This protection is also used to provide additional fire protection.Its threshold from 500 mA to 30 A and time delay can be set to ensure residualcurrent discrimination.Figure 34.An external rectangular toroid sensor is compulsory.39
Summary5.1.DiagramA typical example of a high power electrical installation for an office building (seeNote 1).E88014ESourceIT safetysourceTN-S replacementsourceMain LV boardGSGSNon-priorityfeeders,heating, etc.SafetyfeedersNon-sensitivepriority feeders,lighting, elevator, etc.300 kVASensitivefeeders,computer, etc.ChassisCOMmoduleMain LV boardSourceIT safetysourceGSTN-SreplacementsourceGSChassisCOMmoduleNon-priorityfeedersCommunicationbusProprietarybus40
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 8 and 9: Note 2: If there is an MV Set in Pr
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
Page 24 and 25: Short-circuit downstream of a UPSTh
Page 27 and 28: Protection and Monitoringof a LV Ge
Page 29 and 30: Protection and Monitoringof a LV Ge
Page 31 and 32: The Schneiderprotection solution4.1
Page 33 and 34: The Schneiderprotection solution4.2
Page 35 and 36: The Schneiderprotection solutionThe
Page 37 and 38: The Schneiderprotection solutionb r
Page 39: The Schneiderprotection solution4.3
Page 43 and 44: Summary5.3. Summaryfunctions produc
Page 45 and 46: 6.1. Characteristics tablesof circu
Page 53 and 54: 6.2. Control unitscharacteristicsCo
Page 59 and 60: E887406.2. Control unitscharacteris
Page 61 and 62: 6.2. Control unitscharacteristicsMi
Page 73 and 74: CTCDCE6.3. Communicationcharacteris
Page 75 and 76: CD3 CD2 CD1CE6 CE5 CE4CD3 CD2 CD183
Page 77 and 78: 6.3. Caractéristiquesde la communi

LV generator protection - engineering site - Schneider Electric

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?