氧化锌电阻片承受多重雷击时特性的研究OA

Zinc oxide arrester is an important part of modern distribution line lightning protection,while currently the selection of arrester used in lines is still based on the data under single lightning strike.In nature,the proportion of multiple lightning strikes exceeds 40％,and the impact discharge in a short pe-riod of time puts higher requirements on the lightning withstand level of the arrester.Therefore,the au-thor studies the electrical performance(residual voltage,reference voltage)changes of a 42 mm zinc ox-ide resistor under the action of 4/10 µs lightning current with a lightning interval of 10 ms,when it is subjected to single,double,and triple lightning strikes,respectively.The withstand current limits of the resistor for single,double,and triple lightning strikes are 120 kA,112 kA,and 83 kA,respectively,and the corresponding total lightning energy is 28.5 kJ,36.4 kJ,and 37.2 kJ,respectively.Therefore,the current amplitude under multiple lightning is lower than that under single lightning,and the limit energy is higher than that under single lightning.A finite element simulation model is proposed.When the resis-tor is subjected to lightning strikes,the main effects are thermal stress and heating of the resistor itself.The simulation shows that the stress of single lightning is large,resulting in some single lightning strikes exploding,while the stress of double and triple lightning strikes is small,which is not enough to cause the resistor to explode.Due to the increase in temperature rise,side flashover occurs.