UNLIMITED FREE ACCESS TO THE WORLD'S BEST IDEAS

close
Already an Engineering360 user? Log in.

This is embarrasing...

An error occurred while processing the form. Please try again in a few minutes.

Customize Your Engineering360 Experience

close
Privacy Policy

This is embarrasing...

An error occurred while processing the form. Please try again in a few minutes.

NASA - UFGS-26 11 16

SECONDARY UNIT SUBSTATIONS

active, Most Current
Buy Now
Organization: NASA
Publication Date: 1 February 2010
Status: active
Page Count: 45
scope:

NOTE:

1. This guide specification covers the requirements for three phase secondary unit substations for step-down operation at primary voltages of 601 volts through 38 kilovolts, and secondary voltages, of 600 volts or less.

2. When feasible, provide a separate liquid-filled pad-mounted transformer outside of the facility and a separately erected switchboard/switchgear assembly inside the respective facility in lieu of a secondary unit substation. For NAVFAC LANT projects, do not use secondary unit substations with secondary current greater than 5000 amperes.

3. For NAVFAC LANT projects, where the available fault current is less than 12,000 amperes rms symmetrical, provide pad-mounted switchgear with a fault interrupting switch-way as the transformer primary protection device in lieu of a load interrupting switch. Clearly indicate requirements for identifying signage at switch-ways and at the transformer.

Document History

November 1, 2021
SECONDARY UNIT SUBSTATIONS
A description is not available for this item.
February 1, 2010
SECONDARY UNIT SUBSTATIONS
NOTE: This guide specification covers the requirements for three phase secondary unit substations for step-down operation at primary voltages of 601 volts through 38 kilovolts, and secondary...
UFGS-26 11 16
February 1, 2010
SECONDARY UNIT SUBSTATIONS
NOTE: 1. This guide specification covers the requirements for three phase secondary unit substations for step-down operation at primary voltages of 601 volts through 38 kilovolts, and secondary...

References

Advertisement