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 MIL-HDBK-1012/1
plus or minus 3 percent steady-state band and must not persist for more than
one second.
d) Technical power is required at 60Hz with a steady-state
tolerance of plus or minus 1/4 percent. Transient frequency deviations of
plus or minus 1 percent from any point within the plus or minus 1/4 percent
steady-state band are permitted for up to one second.
e) Rotary frequency converters are normally provided when only 50
Hz commercial power is available. The use of 50 to 60 Hz UPS equipment for
this function is not recommended unless an adequate continuous source of 60 Hz
bypass power can be provided.
f) Certain sites require 400 Hz power in addition to the normal 60
Hz power. This power is normally provided by means of either rotary or solid
state 60 to 400 Hz frequency converters as specified in the BESEP. Power to
drive these converters is normally included in the critical technical load
requirements.
8.12.3.5 UPS Requirements. UPS systems are used at oceanographic facilities
to provide a source of continuous high quality power for critical technical
loads and to provide a transition power source when switching to/from
commercial power and emergency power. An UPS provides continuous output power
by using energy from a set of storage batteries. These batteries are rated in
terms of the length of time they can support the full UPS load before becoming
discharged. UPS batteries are recharged automatically when AC power is
available and battery charging power must be included in UPS input power
estimates. UPS batteries at oceanographic facilities are required to be sized
to supply the full rated UPS load for a minimum of 15 minutes.
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