Research on Lightning Overvoltage of High Voltage Overhead Transmission Lines Considering Subsequent Lightning Strikes
In order to further explore the impact of lightning strikes on high-voltage overhead transmission lines,a high-voltage overhead transmission line model considering subsequent lightning strikes is constructed.Based on this model,the transient potential is calculated and the waveform changes of the transient potential under the first and subsequent lightning strikes are analyzed.The results show that the overvoltage of the subsequent lightning strike is significantly higher than that of the first lightning strike,the rise time of the overvoltage is 1/2 of that of the first lightning strike,and the damage of the subsequent lightning strike to the high voltage overhead transmission line is significantly higher than that of the first lightning strike.Under the condition of lightning strike on the top of a tower,the overvoltage generated by the first lightning strike on the transmission line is obviously greater than that of subsequent lightning strikes,and the oscillation frequency during voltage attenuation is obviously higher than that of subsequent lightning strikes.Based on this,the subsequent lightning strike should be fully considered in the protection design of high voltage overhead transmission lines.
high voltage overhead transmission linelightning strikevoltagetransient potential
NETL
NSTL
万方数据
