Chapter A General rules of electrical installation design

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D32 © Schneider Electric - all rights reserved D - MV & LV architecture selection guide 12 Example: electrical installation in a printworks 12.4 Architecture assessment criteria Criteria Category On-site work time Secondary Environmental impact Minimal: compliance with European standard regulations Preventive maintenance costs Standard Power supply availability Level I Step 1: Architecture fundamentals Choice Main criteria Solution Connection to upstream network Schneider Electric - Electrical installation guide 2008 Isolated site single branch circuit MV Circuits Layout + criticality single feeder Number of transformers Power > 2500kVA 2 x 2000kVA Number and distribution of substations Surface area and power distribution MV Generator Site activity No MV LV MV LV 2 possible solutions: 1 substation or 2 substations b if 1 substations: NO link between MLVS b if 2 substations: interconnected switchboards MLVS 1 MLVS 2 MLVS 1 MLVS 2 Fig. D29 : Two possible single-line diagrams MV LV Trunking MV LV
D - MV & LV architecture selection guide 12 Example: electrical installation in a printworks Step 2: Architecture details “1 substation” solution Choice Main criteria Solution Layout Atmospheric constraint Dedicated premises Centralized or decentralized layout Presence of back-up generator Schneider Electric - Electrical installation guide 2008 Uniform loads, distributed power, scalability possibilities Non-uniform loads, direct link from MLVS Criticality ≤ low Network availability: standard b Decentralized with busbar trunking: v finishing sector, envelope filling b Centralized with cables: v special machines, rotary machines, HVAC, process utilities, offices (2 switchboards), office air conditioning, social premises, maintenance No back-up generator Presence of UPS Criticality UPS unit for servers and office PCs LV circuit configuration 2 transformers, possible partial redundancy MV MLVS 1 MLVS 2 ASI Sheddable Offices Fig. D30 : Detailed single-line diagram (1 substation) LV HVAC MV LV b Two-pole, variant 2 ½ MLVS + NO link (reduction of the Isc by MLVS, no redundancy b process (≤ weak) b sheddable circuit for noncritical loads Trunking Machines D33 © Schneider Electric - all rights reserved
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General rules of electrical install
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