July 2003

Process Technology

Electrical distribution system voltage selection

Use these guidelines to determine the most economical solution

Brambilla, R., Invernizzi, G., Lionetto, P., FWI-Foster Wheeler Italiana

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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