| Electronics > Beginners |
| What happens if a transformer that get less voltage then rated for? |
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| FriedMule:
As I understand it from all your great explanations, I have to calculate the transformers VA by specifying output V and A. So if I want 2 x 30V (= 60V) 10A out it would demand a 600VA transformer. And if I reduce voltage in, I reduce voltage out and the VA ration of the transformer. So to get a 300V in to 2 x 37,5 (= 75V) 10A out but are only supplying 240V in, I should get a 10A x 75A = 750VA transformer to end up with a 600VA transformer? |
| Brumby:
Yes - that is how I would work it out if I were to do what you are considering. |
| C:
Break it down in to simple parts Changing the Voltage does not change, 1. The mass or iron of the transformer. 2. The wire size of the primary. 3. The wire size of the other windings. 4. The number of turns of the windings. Simple fact is that you can not get more out then you put in. You only get x amps on the secondary due to the input which is voltage & current. So 300 Volts input and 10 amps on secondary will only happen at 300 volts input. 240 volts is 0.8 of 300 volts, to keep all the ratios, the secondary can only output 8 amps or less. AT 240 volts, What you get is, A lower VA as you can not reach the designed max VA. A lower resistance secondary due to the wire being larger. Not reaching the designed limits, lets you have a DC current on the secondary with out reaching the limits of the magnetic field. C |
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