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Electrical power systems

Electrical power systems can be composed of the following:

  1. Subtransmission lines to main substations;
  2. Distribution lines to distribution substations;
  3. Utilization lines to distribution transformers; and
  4. Generators to provide emergency, stand-by, and/or prime power for mission essential/critical loads.
Electrical Power Supply And Distribution Book
Electrical Power Supply And Distribution Book

Generally, for Army base-wide distribution changeouts, the preferred CONUS voltage is 13.2 kV or 13.8 kV three-phase, three-wire, with delta primary and wye secondary transformer connections. When extending existing distribution systems, the preferred distribution voltage is the same as the existing distribution voltage.

Use of 15 kV nominal-class systems is preferable to 5 kV nominal-class systems unless system studies indicate a clear advantage over the 15 kV system. Use of solidly grounded, multiple grounded systems is preferredover single-grounded or ungrounded systems.

For Air Force, the preferred CONUS distribution is 12,470Y/7,200 volt, three-phase, with delta primary and wye secondary transformer connections. Voltages for facilities outside of the United States are specified in AFM 86-3.

Title: UNIFIED FACILITIES CRITERIA (UFC) – Electrical Power Supply And Distribution
Format: PDF
Size: 1.5 MB
Pages: 125
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Electrical power supply and distribution
Electrical Power Supply And Distribution

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