Example of MV/LV network structure with dual fed main MV switchboard

Connected to article: Example of standard MV/LV network structure

Network structure:

• MV consumer substation;
• The main MV switchboard can be backed up by a generator set and it feeds two MV/LV transformers;
• MV switchboard can be GIS or AIS and consist of following cubicles:
  – two incoming feeders (from utility)
  – two transformer cubicles
  – bus riser and bus coupling cubicle(s)
  – two outgoing transformer cubicles (supplying LV switchboard)
  – two cubicles connected to generators for backup power supply
• The main low voltage switchboard has a dual power supply with coupler
• Each bus section of the main low voltage switchboard has a UPS system feeding a priority circuit
• The secondary switchboards, terminal boxes and motor control centers are fed by a single source

Reference: Protection of Electrical Networks – Christophe Prévé