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Factors influencing the probability of an apparatus damage in an extended earthing arrangement

机译：影响延长接地装置中设备损坏概率的因素

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摘要

In the present paper lightning overvoltages on apparatus bonded to an extended earth arrangement are investigated. A case study of a large earthing grid (200m × 200m) covering an industrial plant is considered where a stand-alone power supply system (no connection to external lines) is supplying apparatus powered by a secondary board, earthed to a different point from the main distribution board. The values of the stressing voltage on the apparatus due to resistive coupling, the protection measures to be adopted according to the different characteristics of the lines connecting the distribution boards, and the probability of apparatus failure are evaluated. The analysis, performed by several simulations by means of the transient software EMTP-RV, show that protection against lightning of structures and of industrial plant may require the adoption of technical solutions that, even if in accordance with standards [1-4], need a particular study.
机译：在本纸上，研究了粘合到延伸接地布置的装置上的雷电过电压。考虑了覆盖工业设备的大型接地栅格（200m×200m）的案例研究，其中独立电源系统（与外线没有连接）供电由二级板供电，接地到来自的不同点主要配送板。根据电阻耦合，装置上的压力电压的值，根据连接分配板的线的不同特性来采用的保护措施，以及设备故障的概率。通过瞬态软件EMTP-RV进行多次模拟进行的分析表明，防止结构和工业设备的闪电可能需要采用技术解决方案，即使按照标准[1-4]，也需要特定的研究。

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