[Prev][Next][Index][Thread]
Re: pushing a variac
-
To: tesla <tesla-at-grendel.objinc-dot-com>
-
Subject: Re: pushing a variac
-
From: Richard Hull <whitlock-dot-com!RICHARDH-at-uucp-1.csn-dot-net>
-
Date: Thu, 04 Apr 96 14:49:00 PST
-
>Received: from valriva.whitlock-dot-com (valriva.whitlock-dot-com [198.69.64.3]) by uucp-1.csn-dot-net (8.6.12/8.6.12) with SMTP id MAA15663 for <grendel!grendel.objinc-dot-com!tesla-at-uucp-1.csn-dot-net>; Thu, 4 Apr 1996 12:50:15 -0700
-
Encoding: 59 TEXT
Kevin and Jerry,
I have the ratings charts for most powerstat products and they have a full
graph of the overload capabilities and with a smooth load (resistive) it can
be easily overload to 3X the normal rating for a minute with no ill effects
That's 84 amps! With forced air cooling, the unit can be pushed longer.
Amazingly the unit is rated to 2X its rated current (56 amps) for 5 minutes
in open air! The brushes are the weak link in the chain and the varying
inductive load presented by a transformer would limit the general usage to
2X with forced air I woud think. I use a 50 amp powerstat system and have
run up to 100 amps through it for 7 minutes, no air cooling, with only
moderate warming following the run.
Richard Hull, TCBOR
----------
From: tesla
To: 73041.2215; 73663.1536; BrittB7556; JHERRON; JOHNBATES3; abourass;
atech; av599; davide; funkadelic; jbiehler; jmonty; kg7bz; koppemha; logue;
mackte; nwtnmike; osburnw; pinsky; richardh; rmessick; rnicker; rwstephens;
shu95mmc; stevej; twill19; yiorgos
Subject: Re: pushing a variac
Date: Thursday, April 04, 1996 9:04AM