The invention discloses an arc grounding
overvoltage limiting device applied to a medium-
voltage power
distribution system, which includes a single-phase fast
electronic switch controlled by an intelligent controller and a high-energy nano-
zinc oxide energy-absorbing arc extinguishing device; the single-phase fast
electronic switch is three Only, the main circuits of the three single-phase fast electronic switches are connected in a star shape, and the three high-
voltage terminals are respectively connected to the three-phase
busbar of the
system, and the other ends are connected in parallel to the upper end of the high-energy nano-
zinc oxide energy-absorbing arc-extinguishing device The high-energy nano-
zinc oxide energy-absorbing arc-extinguishing device is composed of a high-energy zinc oxide linear
resistor, a nano-damping absorber, a high-energy zinc oxide non-linear
resistor and a high-
voltage thyristor, wherein the high-voltage
thyristor is connected in parallel to the high-energy zinc oxide Linear resistors and nano-damping absorbers at both ends. Compared with the prior art, the invention can effectively limit the single-phase intermittent arc grounding
overvoltage in various operating
modes of the 3-35KV neutral point non-directly grounded
power grid.