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我国开展雷击风险评估业务的主要依据为GB/T 21714-2。而在规范中,有些评估参数在实际取值计算时,给出的值不太接近真实情况,科学性不够,影响了评估的精准性。基于最新发布的IEC 62305-2 2010,其中有些参数的取值方法、计算公式发生了改变。本文主要通过matlab数值模拟对雷击建筑物附近引起内部系统故障概率PMS的取值方法及优化进行了一些分析讨论,分析新版本变动的原因及其利弊。本文也通过讨论和数值拟合获得了连续取值的曲线,很好的解决了该问题,使得参数的取值计算更为准确,对防雷评估工作具有较强的实用价值。
The main basis for conducting lightning risk assessment business in our country is GB / T 21714-2. In the norms, some evaluation parameters in the actual value calculation, the value given is not very close to the real situation, scientific enough, affecting the accuracy of the assessment. Based on the latest release of IEC 62305-2 2010, some of these methods have changed the formula. This paper mainly analyzes and discusses the method and optimization of probability of internal system failure caused by lightning strikes near the building by matlab numerical simulation, and analyzes the reasons for the new version changes and their advantages and disadvantages. This paper also obtains the curves of successive values through the discussion and numerical fitting, which solves the problem well, makes the calculation of the parameters more accurate and has strong practical value for lightning protection assessment.