[142470] in North American Network Operators' Group
Re: Wacky Weekend: NERC to relax power grid frequency strictures
daemon@ATHENA.MIT.EDU (Owen DeLong)
Mon Jun 27 15:36:46 2011
From: Owen DeLong <owen@delong.com>
In-Reply-To: <01311F06-D888-470E-B1DE-D137E86FA8AB@bogus.com>
Date: Mon, 27 Jun 2011 12:30:28 -0700
To: Joel Jaeggli <joelja@bogus.com>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Jun 25, 2011, at 4:59 PM, Joel Jaeggli wrote:
>=20
> On Jun 25, 2011, at 4:47 PM, Andrew D Kirch wrote:
>=20
>> On 6/25/2011 7:43 PM, Paul Graydon wrote:
>>> Take a guess what the datacenter our equipment is currently hosted =
in uses. Yet another reason to be glad of a datacenter move that's =
coming up.
>>>=20
>> Why can't we just all use DC and be happy?
>=20
> motors don't produce DC?
>=20
They can.
> tesla vs edison?
>=20
Tesla was right, Edison was a better marketing person.
AC works better for long-distance transmission. AC could have been made =
much safer had we chosen a 2Khz+ frequency rather than a 60Hz
frequency.
> human safe dc voltage requires comically large conductors for the =
sorts of loads we energize?
>=20
So does human safe AC voltage. The key difference is that AC voltage is =
much easier to change efficiently (transformers) whereas DC-DC
voltage transitions require either an inverter (DC->AC->DC) inefficient =
and usually mechanical, a motor/generator set (inefficient and =
mechanical),
or a DC-DC converter circuit which tends to be horribly inefficient and =
expensive, especially at high amperage.
Owen
