Extinction coil
Arc suppression coil
Arc-extinguish coil
Peterson coil
The arc extinguishing coil, as the name suggests, is for arc extinguishing, which is an inductor coil with an iron core. It is connected between the neutral point of the transformer (or generator) and the ground/earth to form the arc suppression coil grounding system. The power system transmission line is grounded through the arc suppression coil, which is a kind of small/low current grounding system. During normal operation, no current flows through the arc suppression coil. When the power grid is struck by lightning or a single-phase arc grounding occurs, the neutral point potential will rise to the phase voltage. At this time, the inductive current flowing through the arc suppression coil and the single-phase grounding capacitive fault current cancel each other out, so that the fault current can be compensated, the residual current after compensation becomes very small, which is not enough to maintain the arc, and then extinguish itself. In this way, the grounding/earthing fault can be eliminated quickly without causing overvoltage.
Generally, extinction coil includes following kinds:
1.Air-gap type arc suppression coil
2.Turn-adjusting/regulating arc suppression coil
3.Capacitive arc suppression coil
4.Triac-controlled arc suppression coil/ Thyristor type arc suppression coil
5.Arc-suppression coil with magnetic bias
6.On-load current regulating arc suppression coil
Others:
Grounding transformer
