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

MV dual fed switchboard with 2/3 type transfer

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