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I was told it is dangerous to connect directly to mains AC coming from the wall.
My idea with the capacitor shunted between the diode bridge and ground is that it would hold up the voltage near 27 V even if it’s rippling, and then from there I would use the buck converter to drop it to whatever pack it is emulating.
The oil in OCBs serves two purposes. It insulates between the phases and between the phases and the ground, and it provides the medium for the extinguishing of the arc. When electric arc is drawn under oil, the arc vaporizes the oil and creates a large bubble that surrounds the arc. The gas inside the bubble is around 80% hydrogen, which impairs ionization. Main disadvantage of the oil circuit breakers is the flammability of the oil, and the maintenance necessary to keep the oil in good condition (i.e. changing and purifying the oil)
The unexpected failure or outage of a system component, such as a generator, transmission line, circuit breakers or other electric element. A contingency plan specifies actions to alleviate the impacts of a possible shortage or disruption of energy. The grid is operated using a conservative approach with margin for anticipated contingencies.
