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OBIT test Problem (fwd)
---------- Forwarded message ----------
Date: Mon, 22 Oct 2007 01:26:32 EDT
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
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