Abstract
Lightning outage accident is one of the main factors that threat seriously the safe and reliable operation of power system. So it is very important to establish reasonable transmission tower model and evaluate the impulse response characteristic of lightning wave traveling on the transmission tower properly for determining reliable lightning protection performance. With the help of Electromagnetic Transient Program (EMTP), six 500kV tower models are built. Aiming at one line to one transformer operating mode of 500kV substation, the intruding wave overvoltage under different tower models is calculated. The effect of tower model on intruding overvoltage has been studied. The results show that different tower models can result in great differences to the calculation results. Hence, reasonable selection of the tower model in the calculation of back- strike intruding wave is very important.
Highlights
Introduction500kV substation is the pivot of power system, and its performance is very important to power system
Lightning outage accident is one of the main factors that threat seriously the safe and reliable operation of power system
500kV substation is the pivot of power system, and its performance is very important to power system
Summary
500kV substation is the pivot of power system, and its performance is very important to power system. It is very important to calculate the over voltage of tower struck by lightning. Tower model is important to considering lead-in line of the establishment of lightning invasion wave over voltage model. The lightning tower model was carried out by lots of researches [1,2,3,4]. In the transmission line lightning protection analysis, three models, namely lumped inductance model, single-surge impedance model and multi-surge impedance model are selected for the tower simulation. The effects of different models of substation lightning invasion wave are analyzed. Reasonable selection of the tower model in the calculation of backstrike intruding wave is very important
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