Practical experience with resonant grounding

MOST FAULTS in transmission and distribution systems are transient or sustained single line-to-ground faults. Resonant neutral grounding is effected by grounding a neutral of the power system through a reactor, the inductive reactance of which matches within broad margins the capacitive reactance-to-ground of the system. Such an iron core reactor is called a ground-fault neutralizer or Petersen coil. After installation of resonant grounding, ground faults do not affect the operation of the consumers´ equipment, voltage dips do not occur, and the severity of inductive co-ordination problems is reduced.