Probability Surface Distributions for Application in Grounding Safety Assessment
Probability Surface Distributions for Application in Grounding Safety Assessment
复制标题
概率面分布在接地安全评估中的应用
DOI：
10.1109/tpwrd.2012.2204442
复制
发表时间：
2012
影响因子：
4.4
通讯作者：
G. Mpofu
中科院分区：
文献类型：
--
作者：
A. Dimopoulos;H. Griffiths;N. Harid;A. Haddad;A. Ainsley;G. Mpofu
由于采用了不同的许用安全电压值，国家和国际接地标准的安全标准不能很好地比较。这些差异源于假设的最坏情况条件的差异，这是由于采用了嵌入总体确定性安全评估的安全参数的离散概率假设造成的。然而，接地设计标准的协调可以通过采用概率安全评估来实现，这将导致对个人的室颤风险进行量化。本文提出了这种方法的基本原理和标准，并对IEC发表的室颤曲线进行了统计分析。该数值方法还考虑了电流路径对颤动灵敏度和人体阻抗的影响。使用这种方法，然后计算作为施加电压和电击持续时间的函数的室颤的概率面。这种在各种电击情况下描述人体特征的统计方法形成了一个全概率方法的平台，这种方法可以扩展到考虑其他统计参数，并可能导致在减少灾害方面做出投资决策的更客观的衡量标准。
The safety criteria of national and international grounding standards do not compare well due to a variety of adopted values for permissible safety voltages. These differences stem from disparities in assumed worst-case conditions which result from the adoption of discrete probabilistic assumptions of safety parameters embedded within an overall deterministic safety assessment. Harmonization of grounding design standards, however, could be achieved through the adoption of a probabilistic safety assessment which will lead to a quantification of the risk of ventricular fibrillation to an individual. Fundamental principles and criteria for such an approach are developed in this paper, and are based on a statistical analysis of the IEC published curves of ventricular fibrillation. The developed numerical approach also takes into account the effect of current path on fibrillation sensitivity and body impedance. Using this approach, probability surfaces of ventricular fibrillation are then calculated as a function of applied voltage and shock duration. This statistical approach to the characterization of the human body under various electric shock scenarios forms a platform for a full probabilistic approach which can be extended to take into account other statistical parameters, and may lead to a more objective measure for making investment decisions in hazard mitigation.