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所在平台: Udemy |
课程主页: https://www.udemy.com/course/earthing-design-calculation-lightning-protection-system/
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课程名称：接地设计计算与雷电保护系统 课程概述：本课程将深入探讨接地或接地保护的基本概念及其重要性。接地作为一种安全措施，旨在防止电气设备绝缘失效时对人身的电击风险。课程中将解释插头上的第三针为何叫做“接地”连接，它作为电流逃逸的导向，确保电流安全流入大地，避免设备损坏。 接地是将电能通过低电阻导线直接传输至地球的过程，能够为泄漏电流提供简单的排泄路径，从而保护人身安全、电气设备及建筑物尤其是防止雷击的损害。课程将介绍几种常见的接地方法，包括板接地、管接地、棒接地和水管接地等。 此外，课程还将阐述雷电保护系统的功能与组成。雷电保护系统利用金属棒（雷电导体）来保护建筑物免受雷击，并通过与地面连接将雷电安全导入地下。尽管雷电保护系统能有效降低雷击带来的损害，仍无法100%确保安全，因为分散的雷电电流可能会引发火灾或对建筑内部造成伤害。 本课程旨在提升您对接地设计及雷电保护的重要性的理解，从而更好地应用于实际工程中。
What is Earthing or Grounding?A safety measure devised to prevent people from getting shocked if the insulation inside electrical devices fails is called Earthing. To answer our initial question, the third pin in the plug is actually the "Earth" or "Ground" connection of the electrical appliance.The Earth, being a good conductor of electricity, acts as a convenient path for the flow of electrons that escape the insulation. Furthermore, the gigantic size of the Earth paves a path for the safe discharge of the electric charge.In technical terms, Electrical Earthing can be defined as the process of transferring the immediate discharge of the electrical energy directly to the Earth with the help of the low-resistance wire. The electrical earthing is carried out by connecting the non-current-carrying part of the equipment or the neutral part of the supply system to the ground.As stated earlier, earthing provides a simple path for the leakage current i.e., the current that escapes from a device if there's any fault in the insulation. The short circuit current (current that follows the path of least resistance) of the equipment passes to the Earth, which has zero potential, thus protecting the system and equipment from damage.Why is earthing necessary? Human SafetySafety of Electrical EquipmentProtection of Buildings from LightningTypes of Earthing methodsPlate earthingPipe earthingRod earthingWater main methodWhat is a lightning protection system?Lightning protection systems are used to prevent or lessen lightning strike damage to buildings. They protect the internal electrical components of a building, helping to prevent fires or electrocution. Lightning protection comes in the form of a lightning conductor, usually a metal rod, mounted on a building to protect it from lightning strikes. The system will intercept a strike so if lightning hits the building, the lightning rod will be hit first, causing the strike to be conducted through a wire, and passing through to the ground safely.In a lightning protection system, the lightning rod is a single component of the system. The lightning rod requires a connection to earth to give a building protection. Lightning rods come in many different forms, including hollow, solid, pointed or rounded. All lightning rods are made of conductive materials, such as copper and aluminum.Because of the high energy and current levels associated with lightning a lightning protection system can never guarantee complete safety from the effects of lightning. In a lightning protection system, the current will divide to follow every conductive path to ground but even the divided current can cause damage. These secondary "side-flashes" can still cause a fire, blow apart brick, stone, or concrete, or injure anyone within a building.
