| 外过电压 又称雷电过电压、大气过电压 |
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| 外过电压 又称雷电过电压、大气过电压。由大气中的雷云对地面放电二次过电压保护器而引起的。 External overvoltage is also called lightning overvoltage and atmospheric overvoltage. It is caused by thunderclouds in the atmosphere discharging secondary overvoltage protectors on the ground. 分直击雷过电压和感应雷过电压两种。雷电过电压的持续时间约为几十微秒，具有脉冲的特性，故常称为雷电冲击波。直击雷过电压是雷闪直接击中电工设备导电部分时所出现的过电压。雷闪击中带电的导体 ，如架空输电线路导线，称为直接雷击。 There are two kinds of lightning overvoltage: direct lightning overvoltage and induction lightning overvoltage. The duration of lightning overvoltage is about tens of microseconds, which has the gaopin.37ix.com.cnfangfumu.37ix.com.cn bianyaqifj.37ix.com.cnpvcsuomo.37ix.com.cnshuiniji.37ix.com.cn caiguang.37ix.com.cncharacteristics of pulse, so it is often called lightning shock wave. Direct lightning overvoltage is the overvoltage that occurs when lightning strikes the conductive part of electrical equipment directly. Lightning strikes charged conductors, such as overhead transmission line conductors, called direct lightning strikes. |
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