Transient overvoltage in distribution networks in rural areas

A surge sensitivity study of distribution transformers in rural areas of Cundinamarca - Colombia was performed. The analysis took into account the grounding resistance magnitude and the transient overvoltage injection point. Lightning overvoltages are introduced in the IEEE 13 bus system test feeder by using the EMTP-ATP program, results show that delta surge arrester configuration used to protect delta winding of distribution transformers before some microseconds, limits overvoltage transients over zero time axes., contrary to phase - neutral configuration which limit overvoltage to residual voltage in both sides of time axes.