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Re: OBIT Test Problem (reformatted) (fwd)
---------- Forwarded message ----------
Date: Wed, 24 Oct 2007 22:01:02 -0700
From: Barton B. Anderson <bartb@xxxxxxxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: OBIT Test Problem (reformatted) (fwd)
Hi Gary,
I don't believe this behavior is related only to current limited
transformers. I'm not sure if this if of any help, but sometime back in
history I measured a 12/60 NST with regards to coupling within the NST
itself of 10V increments. Just something worth noting how a
transformer/core reacts. This particular tests was for a model
parameters. In simulations, we often throw in the transformer
parameters, then we play with voltages, but we don't always correct the
model for the situation (so that was my purpose here). However, it did
open my eye's a little wider. Not exactly unexpected, but was nice to
see the measurement and then apply it.
http://www.classictesla.com/temp/k_nst1260.gif
Take care,
Bart
Tesla list wrote:
> ---------- Forwarded message ----------
> Date: Tue, 23 Oct 2007 01:12:24 +0000
> From: "Lau, Gary" <Gary.Lau@xxxxxx>
> To: 'Tesla list' <tesla@xxxxxxxxxx>
> Subject: RE: OBIT Test Problem (reformatted) (fwd)
>
> Wow, that's pretty whacky! If I didn't know better, I'd suspect that
> quantum aetherdynamics was at play here. Not only is the Vo/Vi ratio
> different for forward vs. reverse measurements, but the ratio varies with
> excitation voltage. And stranger still, the ratio increases with
> increasing excitation voltage for forward testing, but the ratio DECREASES
> with increasing excitation voltage for reverse testing.
>
> Sorry, but I'm stumped. I wonder if this behavior is specific to
> current-limited transformers? But thank you, you've certainly rewritten
> the advice I would use and give to others trying to measure an NST's
> voltage!
>
> Regards, Gary Lau
> MA, USA
>
>
>> From: Mddeming@xxxxxxx
>> To: tesla@xxxxxxxxxx
>> Cc: gary.lau@xxxxxx, Mddeming@xxxxxxx
>> Subject: OBIT Test Problem (reformatted)
>>
>> Hi Again,
>>
>> Here is the test data reformatted. Hopefully it will survive "moderation" in
>> a readable form. ;^)
>>
>> Matt D
>>
>>
>> Forward Test
>>
>> V in V out Ratio
>> 0.00 0 (Vo/Vi)
>> 4.65 350 75.27
>> 8.48 650 76.65
>> 12.33 950 77.05
>> 16.73 1300 77.70
>> 20.72 1620 78.19
>> 25.15 2000 79.52
>> 30.06 2400 79.84
>> 35.33 2900 82.08
>> 40.60 3390 83.50
>> 45.20 3910 86.50
>> 50.30 4230 84.10
>> 55.65 4690 84.28
>> 60.80 5110 84.05
>> 65.50 5510 84.12
>> 71.70 6000 83.68
>>
>> Reverse Connection (Raw Data)
>>
>> V in V out Ratio
>> 0.00 0.0000
>> 4.24 0.0292 145.21
>> 10.61 0.0804 131.97
>> 15.58 0.1233 126.36
>> 20.55 0.1678 122.47
>> 25.50 0.2132 119.61
>> 29.60 0.2538 116.63
>> 34.71 0.2995 115.89
>> 41.00 0.3604 113.76
>> 45.10 0.3890 115.94
>> 50.80 0.4420 114.93
>> 55.90 0.4920 113.62
>> 60.90 0.5400 112.78
>> 65.10 0.5800 112.24
>> 69.80 0.6270 111.32
>> 75.00 0.6760 110.95
>> 80.80 0.7350 109.93
>> 84.90 0.7740 109.69
>> 90.00 0.8250 109.09
>> 95.30 0.8770 108.67
>> 100.80 0.9310 108.27
>> 105.40 0.9770 107.88
>>
>> Scaled Projected test from above data
>> V in V out Ratio
>>
>> 0.0 0 (Vo/Vi)
>> 2.92 424 145.21
>> 8.04 1061 131.97
>> 12.33 1558 126.36
>> 16.78 2055 122.47
>> 21.32 2550 119.61
>> 25.38 2960 116.63
>> 29.95 3471 115.89
>> 36.04 4100 113.76
>> 38.90 4510 115.94
>> 44.20 5080 114.93
>> 49.20 5590 113.62
>> 54.00 6090 112.78
>> 58.00 6510 112.24
>> 62.70 6980 111.32
>> 67.60 7500 110.95
>> 73.50 8080 109.93
>> 77.40 8490 109.69
>> 82.50 9000 109.09
>> 87.70 9530 108.67
>> 93.10 10080 108.27
>> 97.70 10540 107.88
>>
>>
>>
>>> Subject: OBIT test Problem
>>>
>>> Hi All,
>>>
>>> I was running some tests today on a 10 kV, 23 mA OBIT I picked up for $1.00
>>> at a yard sale.
>>>
>>> First I powered it with 0 to ~140 V on the HV side and read the LV side. I
>>> then multiplied both readings by 100 which I thought would give me fairly
>>> representative response curve for the transformer.
>>>
>>> I then applied 0 to ~ 60 V on the low voltage side and read the HV side
>>>
>> with
>>
>>> my trusty Triplett 630-A meter, which has a built in 0-6000 VAC scale ,
>>>
>> and
>>
>>> compared the results to the first test. NOT EVEN CLOSE!
>>> (See results below) what am I missing?
>>>
>>
>>
>> ************************************** See what's new at http://www.aol.com
>>
>>
>>
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