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RE: OBIT Test Problem (reformatted) (fwd)
---------- Forwarded message ----------
Date: Mon, 22 Oct 2007 18:02:34 -0500
From: Godfrey Loudner <ggreen@xxxxxxxx>
To: 'Tesla list' <tesla@xxxxxxxxxx>
Subject: RE: OBIT Test Problem (reformatted) (fwd)
The closer the coupling constant is to 1, the better the transformer
will behave like an ideal transformer, making the turn ratio fairly
constant. Because the obit transformer is magnetically shunted, one
cannot expect the coupling constant to be close to 1. Also the shunts
introduce non-linear features into the measurements. If you apply too
much voltage to any transformer, the core will saturate and its behavior
will definitely be non-linear; but not this time as you kept the input
voltage well within limits. The varying turn ratio is caused by the
orbit not being an ideal transformer.
Godfrey Loudner
-----Original Message-----
From: Tesla list [mailto:tesla@xxxxxxxxxx]
Sent: Monday, October 22, 2007 4:10 PM
To: tesla@xxxxxxxxxx
Subject: OBIT Test Problem (reformatted) (fwd)
---------- Forwarded message ----------
Date: Mon, 22 Oct 2007 14:49:14 EDT
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?
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