In my country. Our homes mostly don't have third ground wires connecting to the neutral wires of the utility pole because contractors are all into cost cutting. Although some important facilities have them. My old house didn't have neutral/ground lines and it's so far to the utility pole. Someone suggested at the home improvement forum how to provide neutral to the GFCI breaker input I bought for a project so as to power its circuit which needs 120V, but he fell short of providing any more details. He said: "on the need for 120V to power the GFCI's guts, here's an idea: a North American panel in the Phillippines has a neutral bus that is completely unused. Use it. Install a 5 VA (that should be enough) 240V center-tap autotransformer in there, tie the center tap to the neutral bar. Then land all the GFCI pig's tails on the neutral bar".
I have a Siemens QF260A GFCI Breaker:
The poster instructs me to connect the GFCI Pigtail to the 240v autotransformer center-tap. Can it really work? Any possible problem that can occur?