Re: Using SSR to switch transformer


"Arlet Ottens" <usenet+5@xxxxxxxxxx> wrote in message
news:47e92b11$0$14350$e4fe514c@xxxxxxxxxxxxxxxxx
Jan Panteltje wrote:

The 33 Ohm series resistor was just for safe testing, and to prevent
more things from blowing up. I didn't have anything smaller. During
normal use, and with correct SSR trigger, it's not used.

Right, so evaluating 33 + 72 = 105 Ohm.
Total power at 230 V is 230 x 230 / 105 = 503 W.
From that 33/105 goes into your resistor, so 158 W.
Did you use an electric heater as resistor?
Because 230 x 230 / 33 = 1.6 kW ;-)
Just curious to the setup...

Yes, it's an old 1.5 kW electric hotplate that I use for stuff like this.

One or more incandescent light bulbs is very useful for performing tests
where high currents might occur. There is about a 15:1 ratio of resistance
from cold to hot, and you get a very visual indication when something isn't
right.

I use an old car headlight for 12 VDC stuff.

Paul


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