EMTP simulation of induced overvoltage in low voltage system

Shielded by high structure surrounding and with short length of power line, low voltage system is seldom suffered from direct strokes. However, this system is especially threatened by induced voltage due to nearby strokes. The effects of induced overvoltage may be very harmful to power quality and to low BIL peculiar to electrical equipment in low voltage system. In this work, the induced overvoltage in a typical low voltage system in rural areas of Vietnam will be investigated by EMTP/ATP simulation. Rusk model is used to simulate the current source affecting the low voltage system. The influence of grounding resistance in consumer side and the size of load will be analyzed. The discussion and results may provide useful information in insulation coordination of low voltage system.