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The functional earth is used for interference suppression. It is a low-impedance current path between the circuitry and earth and is only used to improve the equipment's performance and not (!) for protective purposes.
This is the purpose of the earthing transformer, which could consist of a zig-zag winding, or a two winding star delta transformer where the star winding of correct voltage supplies an accessible neutral point when connected to the supply system.n earthing transformer provides an earth reference to the power system. This is sometimes done on systems that could become ungrounded under specific fault conditions. This p â¦ revents the need to insulate the conductors to L-L voltage specifications, as well as providing a path for zero sequence current.