Title :
Lightning-induced overvoltages transferred from medium-voltage to low-voltage networks
Author :
Borghetti, A. ; Napolitano, F. ; Nucci, C.A. ; Paolone, M. ; Morched, A.S.
Author_Institution :
Univ. of Bologna, Bologna
Abstract :
Simulation results relevant to realistic configurations of medium-voltage (MV) and low-voltage (LV) distribution systems provide useful information to evaluate both the expected level of power quality problems on LV networks due to lightning and the benefits achievable by a proper installation of protection devices. The paper describes a procedure to evaluate lightning overvoltages induced on MV lines by lightning strokes hitting the ground on the line vicinity and that are transferred through the MV-LV transformer on the LV network. To show how the high-frequency model of the transformer play a crucial role in the simulation of transferred overvoltages, the paper presents the results obtained by using two different models identified by means of laboratory measurements.
Keywords :
lightning protection; power distribution lines; power distribution protection; power supply quality; distribution systems; installation; lightning-induced overvoltages; low-voltage networks; medium-voltage networks; power quality problems; protection devices; Capacitance; Computational modeling; Electromagnetic measurements; Laboratories; Lightning; Medium voltage; Power quality; Power system modeling; Power transformer insulation; Surges; MV and LV insulation coordination; Power quality; high-frequency transformer models; lightning-induced overvoltages;
Conference_Titel :
Power Tech, 2005 IEEE Russia
Conference_Location :
St. Petersburg
Print_ISBN :
978-5-93208-034-4
DOI :
10.1109/PTC.2005.4524738