[MV] Voltage and Hertz

Julian Burke (julianb@esper.com)
Fri, 9 Jul 1999 22:50:42 -0400

"Also on the earlier thread of voltage loss, is this type of voltage loss
the
reason that our 6/12/24V systems are refered to as such when the nominal
voltage
is actually 7.2 / 14.4 / 28.8? I can contribute that on large grey floating
MV's we always refered to such things as gennerally 28VDC. Can someone more
electricly inclined than I explain why some mil equipment some as missile
systems and sonar systems run at 400HZ / rather than 60HZ?"

Yes on the first question.

Second question about 400HZ. Very good question! 400HZ voltage is easier
to "filter" (by capacitors-smaller values too) when rectified from AC to
DC. This is another step to make smaller transformers, lower value
capacitors and very low ripple/noise power supplies. 60 HZ power supplies
require larger value capacitors (higher cost too) and more "iron" in the
transformers which translates into heavier weight for the equipment. Very
critical when high tech systems need to be leaner and meaner. Julian Burke

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