1 Jan
2022
1 Jan
'22
11:56 a.m.
The other benefit to 3phase power to something like a computer is that the filter caps
required can be much smaller. Once you rectify three phases 60* you get MUCH less ripple
because every 60 degrees you have a new peak arriving. When you have a real gas (electron)
guzzler like one of these, DC filtering becomes an issue.
73 Eugene W2HX
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-----Original Message-----
From: cctalk <cctalk-bounces at classiccmp.org> On Behalf Of Jonathan Chapman via
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Sent: Saturday, January 1, 2022 2:35 PM
To: Grant Taylor <cctalk at gtaylor.tnetconsulting.net>; General Discussion:
On-Topic and Off-Topic Posts <cctalk at classiccmp.org>
Subject: Re: VAX 780 on eBay
I think that's the same with all the /computer/
equipment that I've
seen which connects to 3? power. A single phase could be used for all of it.
Computer exist which require three phase at a unit power supply level. It's often also
used for large blowers if the cabinet(s) don't strictly require airflow from e.g. a
raised floor.
But I'm told that it's simpler / more
economical (from a wiring /
cable plant point of view) to deliver more power to the equipment as
3? than it is 1?.
It also saves you on current-carrying conductors for raceway fill calculations as long as
your power factor isn't too bad.
Thanks,
Jonathan