Abstract: Thunder is dangerous for safety in oil depot.It is essential to build up multi-grade safety-alarming system of lightning.The electric field on the ground in the course of lightning has been measured.It is found feasible to duild up multi-grade safety-alarming system of lightning.The variation of electric field on the ground in the course of lightning has been studied and the thresholds of the electric field on the ground in the course of lightning have been given,And so,a multi-grade lightning-alarming system based on surveying the electric fields on the ground is given.

Key words: thunder, lightning protection, electric field, electric discharge, alarm device, threshold value

摘要： 雷电是油库区安全生产的最大隐患之一,建立多级雷电报警系统十分必要.经过多年现场实测证明,通过测量地面电场,可以精确掌握几十千米内云层带电情况,因此,测量雷暴前后地面电场的变化,建立报警系统是可行的.对大量测量数据进行分析研究,总结出雷暴发展过程中地面电场的变化规律,确定多级报警的阈值,提出以监测地面电场为主的雷电多级报警.

关键词: 雷电, 防雷, 电场, 放电, 报警, 阈值