Arc suppression coil

The invention, which belongs to the technical field of neutral-point grounding protection, provides an arc suppression coil comprising an annular iron core. A first coil and a second coil winds aroundthe iron core; the head end of the first coil is connected with a neutral point; and the head end of the second coil is grounded. Each of the first coil and the second coil are provided with a plurality of tap joints. The tap joints divide the first coil and the second coil into a plurality of sections; the wire cross sections, close to the head end of the first coil, of at least two sections inthe first coil are larger than the wire cross sections away from the head end of the first coil; and the wire cross sections, close to the head end of the second coil, of at least two sections in thesecond coil are larger than the wire cross sections away from the head end of the second coil. According to the arc suppression coil, at least to sections in each coil are wound by using wires with different cross sections and