How does an oil burner ignition transformer generate reliable spark ignition?

The transformer steps up line voltage to high voltage and delivers it to electrodes with a controlled gap. The high electric field ionizes air and creates an arc that ignites the fuel spray. Reliable ignition comes from stable secondary voltage, adequate current, and good insulation that prevents internal breakdown. Proper electrode alignment, clean insulators, and dry wiring prevent spark loss to ground. Burner controls time the ignition period and ensure flame verification, improving safety and reducing nuisance lockouts.