建筑物的防雷接地系统的探讨

LIGHTNING PROTECTION AND GROUNDING SYSTEM FOR BUILDINGS

介绍了建筑物的防雷接地保护及接地故障的保护。对雷电的形成、种类、防雷的方法进行了简单的探讨。分析了接地故障形成的原因及如何正确选择断路器。总等电位联结在接地系统中的应用,在一定程度上降低了建筑物内间接接触的接触电压及不同金属部件间的电位差,防止了人身电击事故及火灾。重复接地一定程度上降低了设备到变压器中性点之间的总电阻,有效地增大故障电流,提高接地故障保护的灵敏度,从而实现了接地故障保护。

This article introduces the grounding for lightning protection and grounding fault protection for buildings,briefly discusses the formation and types of lightning and the lightning protection methods,and analyzes the reasons for grounding fault and how to appropriately select circuit breaker.The application of equipotential bonding in grounding system can reduce the contact voltage in indirect contact and the potential difference between different metal components to a certain extent,thus effectively preventing electric shock accident and fire.Repeated grounding can decrease the total resistance between the equipment to the transformer neutral point to a certain extent,effectively increases the fault current,and improves the sensitivity of grounding fault protection,so as to effectively achieve grounding fault protection.