Re: Using SSR to switch transformer

On a sunny day (Tue, 25 Mar 2008 10:52:34 +0100) it happened Arlet Ottens
<usenet+5@xxxxxxxxxx> wrote in <47e8cb63$0$14344$e4fe514c@xxxxxxxxxxxxxx>:

http://c-scape.nl/transformer/second-peak.png

The series resistor is 33 Ohms. Current trace represents voltage across

Without the series resistor, the effect is similar. Unfortunately, I
don't have a real current probe, so I can't measure the current without
the resistor.

Here are the voltage waveforms across the transformer primary, switching
3 half cycles at peak voltage _without_ series resistor. First burst,
followed by exactly the same burst a minute later.

http://c-scape.nl/transformer/first-no-R.png
http://c-scape.nl/transformer/second-no-R.png

You can see the voltage drop across transformer as current increases.
The lights in my room also briefly dim during second burst.


Question: did you have the 1 Ohm load connected in teh experiments?
You transformer ratio is 230 / 27 = 8.51, so the 1 Ohm
is seen as the square of that in the primary, so as 72 Ohm.
I would expect the magnetic filed to collaps sooner with 1 Ohm load.
33 Ohm series with 72 Ohm load seems not a pleasant ratio.
Better use a lower shunt if the load is connected?


.

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