Your current sensing resistor is 1 ohm?? How many turns of wire do you think make up this resistance?? Film resistors can also have a spiral cut to trim resistance but it's inductance is inconsequential for small resistance values.? I suspect that if your 1 ohm resistors has a few widely spaced turns, it's inductance can be ignored especially if the core is non magnetic.
Can you compare the zero crossing of voltage on the transformer primary to the zero crossing of voltage on the secondary?? Do they exactly overlay each other or is there a time difference?? If so, how many degrees does this represent?? I would think that the voltage phase difference between the primary and secondary will change as the load on the transformer changes.? This may also vary due to the method of transformer construction from one type of transformer to another.
Jim
Logic: Method used to arrive at the wrong conclusion, with confidence.? Murphy
On Sunday, August 4, 2024 at 12:54:47 PM CDT, HF via groups.io <incorridge@...> wrote:
This morning I looked further for voltage spikes while turning the transformer on and off using a pliers spanning the SSR terminals.? Spikes exceeding the usual peak voltage were quite rare.? Smaller spikes occurred both at turn-on and turn-off.? I also observed substantial sharp spikes in the current waveform concurrent (pun noted) with the voltage spikes.? However, I'm skeptical of these.? The current-sensing resistor is wire-wound so the voltage spike on the primary might appear as a current spike here because the resistor is inductive.? NB: next time use a film resistor to sense current.
Jim Whartenby