In article , Jeff Thies wrote:
On 4/10/2011 11:29 PM, Phil Allison wrote:
"Jeff Thies"
Phil Allison wrote:
"Jeff Thies"
Phil Allison wrote:

I suggest you provide the next replacement for that vulnerable tranny
with
some "protection" - firstly an in-line fuse of say 1/4 amp AND a
capacitor wired across the primary of say 1uF rated for continuous
use
across the AC supply.

If there is an overload on the tranny, the fuse will blow.

The 1uF capacitor should suppress spike voltages enough to save the
tranny from harm.

1 uF sounds a little high.


** No it ain't.

I thought you had simply misspoke and that this was an honest error.

The reactance of a 1uF cap at 60Hz is: 2652 ohms (1/(2*pi*F*C)
Online calculator:
http://www.kusashi.com/reactance-c.p...&stage=results

V^2/R = W

Assuming primary, as why would you put it on the secondary:

120^2 / 2652 = 5.43 W

Does that not seem wrong to you?

** Completely.

Such a cap dissipates no energy at all.

What planet do you come from ??

What a jerk you are. You do realize that is 45mA running through that.


** What sort of know nothing JERK thinks that capacitors dissipate energy
??

It doesn't have to dissipate energy to explode. That is a lot of joules.

Then proceeds to calculate the reactive impedance and treat it the same as
resistance ??

Big bad.

So I left out the PF, so what?

Zero out of ten.

PF of a capacitor suitable to connect across an AC line is usually less
than .01.

My first encounter with you, but no doubt others have had the same
reaction.
Make that longish story shorter

Phil Allison is well known in sci.electronics.design to be quick to
get brash, even calling people names and sometimes a little worse. If
only he would avoid that, a lot more people would think a lot more highly
of him than they do now, since he does fairly well know what he is talking
about when it's electrical.
--
- Don Klipstein )