摘要
建立了浮顶储罐雷云电场下的雷电感应危害实验模型,采用直流高压源模拟雷云,测量在不同电场环境下,浮顶储罐浮顶的雷云感应电荷量。通过研究发现,浮顶储罐浮顶感应电荷量随模拟雷云电场强度的增大而增大,当直流电压达到7 kV时,模拟浮顶上的感应电荷为1.88×10^(-2)μС,通过计算可知,当雷云在浮顶上方时,浮顶感应电荷量约为284~852 μC,浮顶瞬间电位为400~1 200 kV。该研究说明浮顶储罐在雷云电场的感应下会产生大量的感应电荷,瞬间电位可以达到数百千伏,储罐金属附件存在一些放电间隙,会引发储罐雷电火灾事故,可伸缩式接地装置及系统的等电位连接、绝缘措施可以实现消除雷电感应火花放电的危害。
The lightning impulse test model of the floating roof tank was established. The lightning source of the floating roof was measured by using the DC high voltage source to simulate the thundercloud.It is found that the induced charge of floating roof can increase with the increase of the electric field intensity of the simulated thundercloud. When the DC voltage reaches 7 kV,the induced charge on the floating roof is 1. 88 × 10^（-2）μС It can be seen that when the thundercloud is above the roof,the floating charge is about 284 ~ 852 μC and the floating roof is 400 ~1 200 kV. The study shows that the floating roof can produce a large amount of induced charge under the induction of the thundercloud electric field,the instantaneous potential can reach hundreds of kilovolts,there are some discharge gap in the storage tank metal parts,which can cause the lightning accident of the tank and the telescopic Grounding device and the system of equipotential bonding,insulation measures can be achieved to eliminate the lightning induced spark discharge hazards.
出处
《安全、健康和环境》
2017年第10期38-40,共3页
Safety Health & Environment
关键词
浮顶储罐
雷电感应
电荷量
雷击火灾
floating roof tank
Lightning inductance
charge amount
lightning fire
