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RE: OBIT test Problem (fwd)
---------- Forwarded message ----------
Date: Mon, 22 Oct 2007 13:18:25 +0000
From: "Lau, Gary" <Gary.Lau@xxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Cc: "Mddeming@xxxxxxx" <Mddeming@xxxxxxx>
Subject: RE: OBIT test Problem (fwd)
Hi Matt:
I understand your point, but I can't make any sense out of the data you attached. The formatting must be horribly mangled; it's unclear how many columns there should be for each section and what the headings are. Can you resend with blank lines between data lines, or send it to me off-list as a properly formatted html message?
I didn't follow why you multiplied the reverse-hookup measurements by 100. Where did the 100 factor come from?
Thanks, Gary
> From: Mddeming@xxxxxxx
> To: tesla@xxxxxxxxxx
> Cc: Mddeming@xxxxxxx
> 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 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?
>
> Matt D.
>
> Reverse test Raw Data
>
> V in V out Ratio 0 0 4.24 0.0292 145.20548 10.61 0.0804
> 131.96517 15.58 0.1233 126.35848 20.55 0.1678 122.46722 25.5 0.2132
> 119.60600
> 29.6 0.2538 116.62727 34.71 0.2995 115.89316 41 0.3604 113.76249 45.1 0.389
> 115.9383 50.8 0.442 114.93213 55.9 0.492 113.61789 60.9 0.54 112.77778 65.1
> 0.58 112.24138 69.8 0.627 111.32376 75 0.676 110.94675 80.8 0.735
> 109.93197 84.9 0.774 109.68992 90 0.825 109.09091 95.3 0.877 108.66591
> 100.8 0.931
> 108.27068 105.4 0.977 107.88127 110.8 1.031 107.46848 114.6 1.069
> 107.20299 120.2 1.125 106.84444 124.7 1.169 106.67237 131 1.23 106.50407
> 136.7
> 1.287 106.21601 141.5 1.336 105.91317 148.5 1.408 105.46875
>
>
>
> Projected Results Actual Forward Test V in V out Ratio V in V
> out Ratio 0 0 0 0 2.92 424 145.205479 4.65 350 75.26882 8.04
> 1061 131.965174 8.48 650 76.65094 12.33 1558 126.358475 12.33 950
> 77.04785
> 16.78 2055 122.467223 16.73 1300 77.70472 21.32 2550 119.606004 20.72
> 1620
> 78.18533 25.38 2960 116.627266 25.15 2000 79.52286 29.95 3471 115.893155
> 30.06 2400 79.84032 36.04 4100 113.762486 35.33 2900 82.08322 38.9 4510
> 115.938303 40.6 3390 83.49754 44.2 5080 114.932127 45.2 3910 86.50442
> 49.2 5590
> 113.617886 50.3 4230 84.09543 54 6090 112.777778 55.65 4690 84.27673 58
> 6510 112.241379 60.8 5110 84.04605 62.7 6980 111.323764 65.5 5510
> 84.12214
> 67.6 7500 110.946746 71.7 6000 83.68201