Re: Idea ??? The Wankers

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <dhmccauley-at-spacecatlighting-dot-com>

The good ole Wankers.  We have a few of these, however i don't think anyone
has used one yet as its always obvious when an inductor goes bad.

Of course, the bigger Wanker LCR analyzer with current amplifiers is very
useful.

Dan



> Ok guys, here it is, the answer to our prayers.
> On pg. 131 September 2002 issue of Electronics Products Mag.
> Wayne Kerr Electronics
> Model 6815
> Impulse Winding Tester
>
> "By applying up to 5 KV pulse and analyzing the decaying waveform detects
:
> Changes in material
> Damaged windings
> Electrical shorts
> In stock
> ONLY $6000.00
>
> http://www.waynekerr-dot-com
>
> I know I won't be going out to pick one up, but could this be simulated on
a
> spice program to get an idea of what parameters need to be measured ?
>
> I haven't checked the link or started to research the theory on how this
> thing does what it does.
> (always been a cw and analog kind of person, pulse deficient so to speak)
>
> And there's always Bert if I hit a dead end !
>
> SM
>
> -----Original Message-----
> From: Dave Hartwick [mailto:ddhartwick-at-earthlink-dot-net]
> Sent: Friday, September 20, 2002 1:23 PM
> To: Steve Mach
> Subject: RE: Idea ???
>
>
> Steve,
> There are actually 2 LV windings on this piglet, which I'm sure is
typical.
> For 240 vac operation, they are connected in series. I separated them and
> measured the inductance of each. During periods when it was functioning
> properly, they both measured about 10 uH. In failure mode, one measured
> about 2.5 and the other about 16.5 uH. That is how it measures now in what
> seems to be its finally dead state. I don't know why it's showing uH and
not
> mH, but the relative difference is still there. It's a Tenma LCR meter
with
> 120 and 1000 hz modes. 120 hz mode seemed to yield the most comprehendible
> data.
>
> I guess I could use a scope and sig gen to perform the test you propose,
but
> we would need data points from similar known working  units for it to be
> meaningful, I would think. I would not want to assume generally linear
> behavior of a working unit. But...you guys know more about this stuff than
I
> do.
> Dave
>
>
>
> Hi Again, Here's the  Idea I wrote Terry about.
> SM
>
> Hi Terry, Sorry it's taken so long to get back to you, customer emergency
at
> work.
> The basic idea goes as follows,
> Measure and record Xl at several frequencies, say 60 to 2000 Hz.
> It should remain linear with freq. (Xl=2piFL)
> Would a shorted turn or turns introduce a non-linearity to Xl with
> increasing freq.
> Thanks,
> SM
> And his response.
> Hi Steve,
> A shorted turn should be pretty dramatic in any test. There may be a
> problem that oil gets in there on opens the short until some serious
> voltage gets across it. Impulse testing is usually used on these things to
> find that but not easy to make one in the basement. Not sure what a good
> test would be.
> A low power signal generator does have an advantage of having a low
> voltage that would not couple well to the other windings. So it does
> isolate the winding you are looking at without the others affecting things
> much.
> Cheers,
> Terry
>
>
>
>
>
>
>