Selecting voltage level of the electrical
distribution system in a large industrial installation is
related to several factors that shall be analyzed from
technical and economical points of view. The main factor is
plant total power demand. Usually, the bigger the total plant
load, the higher the supply voltage. As a consequence, for a
plant with high power demand (reference figure may be 30 MW)
in addition to the 6 kV distribution/utilization voltage
commonly used to feed large motors, a second voltage level
shall be selected as the primary distribution system to
distribute the energy to several load centers within the
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