6 Nov
2016
6 Nov
'16
10:46 a.m.
On 11/06/2016 09:18 AM, ethan at 757.org wrote:
Not at all--that goes back at least to the 1960s. Consider the CDC
mainframes--MG sets providing 3-phase 400Hz power to variac-regulated
3-phase fullwave rectifier setups. The ripple frequency is 2400Hz and
has a very high DC component.
This is a very sensible arrangement, as the power supplies need not be
tailored to a specific line voltage or frequency.
I'm somewhat surprised that no one talks much about cooling systems on
supercomputers, be it forced air or liquid nitrogen. Both Cray and CDC
spent a fair amount of time and money on getting cooling to their big
machines.
How about cooling towers for the chilled water supply?
--Chuck
But smaller
than the Crays of the era. If it doesn't run on 400Hz,
it's a 'mini' supercomputer.
Hmmm I knew the earlier Crays often had motor generator setups and
such but I thoght that was just for power filtering and maybe
flywheels for ups setups. Didn't know they were 400hz! Odd!