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Total 7 documents matching your query.

1. Re: LF: Decca faulty transformer? (score: 1): Author: Andy Talbot <[email protected]>; Date: Mon, 4 Apr 2011 20:02:40 +0100; So if you're measuring 1uH (ish) and the correct value is 100uH (ish) thats a mutual coupling, M , of 0.99. Not bad. Wonder if 250 MVA 400kV 3 phase supergrid transformers have a better M value. Andy; /rsgb_lf_group-archives/html/rsgb_lf_group/2011-04/msg00034.html (13,981 bytes)
2. Re: LF: Decca faulty transformer? (score: 1): Author: Warren Ziegler <[email protected]>; Date: Mon, 4 Apr 2011 14:45:06 -0400; Mike, I just measured a known good Decca output transformer with a Peak Atlas LCR meter. The 3.2mH is correct for the monitor winding, the other windings should be a bit above 106uH each (I got value; /rsgb_lf_group-archives/html/rsgb_lf_group/2011-04/msg00124.html (13,332 bytes)
3. Re: LF: Decca faulty transformer? (score: 1): Author: Warren Ziegler <[email protected]>; Date: Mon, 4 Apr 2011 14:20:51 -0400; Mike, I had this fault, I believe that it is not uncommon. It can be caused by a nearby lightning strike or by severe mis-tuning in either case a short develops due to a voltage breakdown of the insu; /rsgb_lf_group-archives/html/rsgb_lf_group/2011-04/msg00155.html (11,994 bytes)
4. Re: LF: Decca faulty transformer? (score: 1): Author: "Mike Dennison" <[email protected]>; Date: Mon, 04 Apr 2011 19:34:00 +0100; Thanks for the suggestion Andy. I did that already using an Atlas LCR meter (one of the best bits of test gear I ever bought), but didn't believe the result. It showed what looked to me like very low; /rsgb_lf_group-archives/html/rsgb_lf_group/2011-04/msg00414.html (10,839 bytes)
5. Re: LF: Decca faulty transformer? (score: 1): Author: Andy Talbot <[email protected]>; Date: Mon, 4 Apr 2011 19:13:47 +0100; Disconnect all windings and measure the inductance. If the transformer is OK, the L will be high - with Xl many times the operating impedance. A shorted turn - which is what it looks as if you may ha; /rsgb_lf_group-archives/html/rsgb_lf_group/2011-04/msg00514.html (11,250 bytes)
6. Re: LF: Decca faulty transformer? (score: 1): Author: Andy Talbot <[email protected]>; Date: Mon, 4 Apr 2011 19:46:57 +0100; Yes, definitely. If the transformer were absolutely perfect all flux would be linked, and your shorted turn intercepts everything. So you are transforming a few milliohms though the turns ratio which; /rsgb_lf_group-archives/html/rsgb_lf_group/2011-04/msg00521.html (13,135 bytes)
7. LF: Decca faulty transformer? (score: 1): Author: "Mike Dennison" <[email protected]>; Date: Mon, 04 Apr 2011 18:56:44 +0100; I have a fault on my Decca 5501 LF transmitter. It appears that the main output transformer / combiner is faulty. Each Tx module takes current when connected to the transformer, even when the output; /rsgb_lf_group-archives/html/rsgb_lf_group/2011-04/msg00679.html (8,950 bytes)

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