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#1
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On Tue, 25 Nov 2003 22:14:36 GMT, "Doug K7ABX"
wrote (with possible editing): I also have used the regulating transformers at large commercial on shore radio/computer installations. Sola was the brand we used, one on each leg of 3 phase shore power. Some critical units had small single phase transformers mounted in the rack. They covered about 95-135 volts in for constant output. However, they take several cycles of power change for the change to be seen at the output. I got into trouble having a large UPS unit feeding the transformers, as the transformer change was slower than the UPS and we got into a voltage bucking problem. Ended up taking the transformers out and just using the UPS. Do a web search for Sola line regulator transformers (they are really a mag amp autotransformer device). E-bay has them from time to time. Doug K7ABX I think there are two kinds. One type uses a swinging core in the transformer and works by adjusting the output voltage. The other uses what is known as a "ferroresonant" transformer which works by saturating the core at resonance with a non-polarized capacitor which keeps the output steady regardless of input voltage swings. In a marine environment, I'd opt for the latter as there are no moving parts. -- Larry Email to rapp at lmr dot com |
#2
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On Wed, 26 Nov 2003 14:28:34 GMT, L. M. Rappaport
wrote: I think there are two kinds. One type uses a swinging core in the transformer and works by adjusting the output voltage. The other uses what is known as a "ferroresonant" transformer which works by saturating the core at resonance with a non-polarized capacitor which keeps the output steady regardless of input voltage swings. In a marine environment, I'd opt for the latter as there are no moving parts. However, you can have problems when using a ferroresonant tranformer or charger on a genset or other off-grid power sources, since the ferroresonant transformer depends on the power frequency being very close to 60 Hz. If the frequency shifts, the transformer output voltage will also vary. -- Peter Bennett, VE7CEI new newsgroup users info : http://vancouver-webpages.com/nnq GPS and NMEA info: http://vancouver-webpages.com/peter Vancouver Power Squadron: http://vancouver.powersquadron.ca |
#3
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On Sat, 29 Nov 2003 12:02:41 -0800, Peter Bennett
wrote (with possible editing): On Wed, 26 Nov 2003 14:28:34 GMT, L. M. Rappaport wrote: I think there are two kinds. One type uses a swinging core in the transformer and works by adjusting the output voltage. The other uses what is known as a "ferroresonant" transformer which works by saturating the core at resonance with a non-polarized capacitor which keeps the output steady regardless of input voltage swings. In a marine environment, I'd opt for the latter as there are no moving parts. However, you can have problems when using a ferroresonant tranformer or charger on a genset or other off-grid power sources, since the ferroresonant transformer depends on the power frequency being very close to 60 Hz. If the frequency shifts, the transformer output voltage will also vary. I haven't the experience, but you are probably correct. Resonance would depend upon the "Q" of both the transformer and capacitor. Another important consideration is that while ferroresonant transformers might work for charging batteries, since they operate using square waves (core saturation), they are usually not recommended for running electronic equipment or anything sensitive to spikes. Battery charging is ok, however, since the battery acts like a big sink for spikes. -- Larry Email to rapp at lmr dot com |
#4
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On Sat, 29 Nov 2003 12:02:41 -0800, Peter Bennett
wrote (with possible editing): On Wed, 26 Nov 2003 14:28:34 GMT, L. M. Rappaport wrote: I think there are two kinds. One type uses a swinging core in the transformer and works by adjusting the output voltage. The other uses what is known as a "ferroresonant" transformer which works by saturating the core at resonance with a non-polarized capacitor which keeps the output steady regardless of input voltage swings. In a marine environment, I'd opt for the latter as there are no moving parts. However, you can have problems when using a ferroresonant tranformer or charger on a genset or other off-grid power sources, since the ferroresonant transformer depends on the power frequency being very close to 60 Hz. If the frequency shifts, the transformer output voltage will also vary. I haven't the experience, but you are probably correct. Resonance would depend upon the "Q" of both the transformer and capacitor. Another important consideration is that while ferroresonant transformers might work for charging batteries, since they operate using square waves (core saturation), they are usually not recommended for running electronic equipment or anything sensitive to spikes. Battery charging is ok, however, since the battery acts like a big sink for spikes. -- Larry Email to rapp at lmr dot com |
#5
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On Wed, 26 Nov 2003 14:28:34 GMT, L. M. Rappaport
wrote: I think there are two kinds. One type uses a swinging core in the transformer and works by adjusting the output voltage. The other uses what is known as a "ferroresonant" transformer which works by saturating the core at resonance with a non-polarized capacitor which keeps the output steady regardless of input voltage swings. In a marine environment, I'd opt for the latter as there are no moving parts. However, you can have problems when using a ferroresonant tranformer or charger on a genset or other off-grid power sources, since the ferroresonant transformer depends on the power frequency being very close to 60 Hz. If the frequency shifts, the transformer output voltage will also vary. -- Peter Bennett, VE7CEI new newsgroup users info : http://vancouver-webpages.com/nnq GPS and NMEA info: http://vancouver-webpages.com/peter Vancouver Power Squadron: http://vancouver.powersquadron.ca |
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