This circuit interrupts the power supply when grounding is missing. The circuit is from an old documentation (from the 80's) using current transformers and other components of the time.
Among the alternative energy sources, one of the most promising is that represented by Astro-Rei....
This circuit is from the 1977 GE semiconductor manual. The components used are uncommon today....
Found in an Electronics World of 1968, this circuit is indicated for applications in photography...