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所在平台: Udemy |
课程主页: https://www.udemy.com/course/low-voltage-transformer-application/
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课程名称：低压变压器应用 课程概述：本课程为学生提供了处理多种变压器应用的基础知识，无论变压器的大小。我们将以75kVA和500kVA变压器作为例子。学生将了解《北美电气规范》（NEC）第450条款的适用范围。课程将回顾NEC的多个领域，使学生掌握需要遵循NEC要求的不同应用所需的技能。这些探讨的NEC部分包括： - **第215条 供电线路**：变压器的初级和次级导体作为供电线路，适用第215条的要求。此条款有助于确定最低导体电流承载能力，并指向第240条以获得适当的导体保护。我们将讨论215.3条款，并提供适用于变压器应用的简化方法。 - **第240条 过流保护**：包含直接适用于变压器次级导体的重要要求。变压器次级的过流保护与其他导体存在独特的情况，本课程将帮助您导航NEC，以确保变压器及其导体的适当保护。 - **第408条 配电板、开关设备与面板**：直接从变压器供电时的重要要求。本课程将阐述在许多应用中，为什么我们需要在变压器上设置次级过流保护设备（OCPD），其原因可能出乎意料。 - **第450条 变压器及变压器井（包括次级连接）**：本课程的关键条款，重点关注变压器的过流保护。 本课程将为正确的变压器保护奠定基础，帮助学员理解如何导航《国家电气规范》。适当的变压器保护始于设计阶段。讲师将提供行业技巧和建议，以确保设计坚实，一旦设备采购和安装，变化最小。此外，本课程还将为现有安装提供基础，确保已安装变压器及相关设备的持续保护。
This course will give the student a foundation to handle many transformer applications regardless of the size of the transformer. Two transformers will be used as our example including a 75kVA and 500kVA transformer. The student will understand when Article 450 applies and when it does not. A review of various areas of the NEC will give the students skills necessary for many different applications that require navigating NEC requirements. NEC Areas that will be explored and understood include the following:Article 215 Feeders: Conductors on primary and secondary of the transformer are feeders and the requirements of Article 215 apply. This article will help determine the minimum conductor ampacity but essentially points the user to Article 240 for proper conductor protection. the section discussed here includes 215.3 but as you'll see, we do provide a short-cut and the reason why the short-cut is appropriate to a transformer application.215.3 Overcurrent Protection.Article 240 Overcurrent Protection: Includes important requirements that directly apply to transformer secondary conductors. A transformer secondary presents a unique situation in that the overcurrent protection for that conductor is not located at the source of the secondary conductor. This program will help you navigate the NEC to ensure proper protection of not only the transformer but also the transformer conductors. 240.4 Protection of Conductors.(F) Transformer Secondary Conductors.Article 408 Switchboards, Switchgear, and Panelboards: Will be important when supplying this equipment directly from a transformer. The requirements here especially for panel boards is often missed by design engineers and installers. We'll understand why in many applications, we will be required to place a secondary OCPD on the transformer and the reason may not be what you expect.408.36 Overcurrent Protection.(B) Supplied Through a Transformer.Article 450 Transformers and Transformer Vaults (Including Secondary Ties): Critical Article for all things transformers but for this curriculum we will focus on the overcurrent protection for the transformer.450.3 Overcurrent Protection.(A) Transformers Over 1000 Volts, Nominal.(B) Transformers 1000 Volts, Nominal, or Less.This course will provide a foundation for proper transformer protection and give the attendee a foundation to understand how to navigate the National Electrical Code. Proper transformer protection begins during the design phase. Throughout this course, the instructor will provide tricks of the trade and advice on how to ensure a solid design that will have minimal changes once equipment is purchased and installed. This course will also provide a foundation to address existing installations to ensure the continued protection of installed transformers and related equipment.
