摘 要
当今社会化石燃料已经成为主要能源，而电能已经也已成为人们生活中不可或缺的二次能源，电能是清洁的，许多企业对电量的需求特别大，特别是钢铁、冶金、石化行业的工业企业，对供配电可靠性的要求尤为高，所以对企业供配电系统的研究显得尤为必要。
本文以某钢铁公司的供配电系统为研究对象，首先，论文全面阐述了课题的背景与意义，同时简要叙述了一下设计的主要内容。然后通过需要系数法分析负荷的情况，明确负荷等级，确定功率因素的大小，再通过功率因素进行无功补偿，从而选择主变压器的型号，进行系统主接线设计。确定好方案后再进行两台变压器并列运行时的短路计算，统计结果成表，再表格结果进行主要元件的选择与校验，我们通常是在正常运行条件下进行设备选型，在短路条件下开始对设备进行校验，包括母线、断路器、互感器、配电柜和避雷器的选择与校验，选择符合要求的设备。
最后一个章节我是想对本企业设计一个保护，包括主变压器继电保护原理的设计和接地保护的设计，从而保证了钢铁企业供配电生产的安全可靠，提高了企业生产的效率。
关键词：负荷计算；短路计算；继电保护
ABSTRACT
Today's society has become a major fossil fuel energy, and energy has also become an integral part of life secondary energy, clean energy, many companies particularly large demand for electricity, especially in iron and steel, metallurgy, petrochemical industry, industrial business, supply and distribution reliability requirements is particularly high, so the enterprise for research and distribution system is particularly necessary.
In this paper, a steel company's supply and distribution system for the study, first of all, a comprehensive paper describes the background and significance of the subject, along with a brief description of the main content about design. Then we need to factor analysis load, clear the load levels to determine the size of the power factor, reactive power compensation and then by the power factor in order to select the main transformer model, the system main wiring design. Determine a good plan and then short-circuit the two transformers in parallel computing runtime statistics into a table, and then select the device and check the results of the calculation using load and short-circuit current calculation, with normal operating conditions our choices, with short-circuit conditions validation, including bus, circuit breakers, transformers, power distribution cabinets and arrester selection and validation, to elect qualified electrical equipment, designed the secondary circuit.
Finally, protection design, including design and ground protection design principles of the main transformer protection, thus ensuring the production of iron and steel enterprise supply and distribution of safe, reliable, improve production efficiency.
Key words：load calculation;Short circuit calculation;Relay protection
目 录
电能是当代社会最重要的能源之一，人们的生产生活都离不开它。在生活中小到洗衣机、手机、电脑等，大到商场照明、火车运行等都需要电力才能维持。电能的获取方式多种多样，包括传统的水力发电、火力发电、核能发电，还有新兴的风能发电、利用太阳能等，随着电力社会的到来，人们的生活变得更便捷、更智能、更舒适，因此，人们也对电能质量提出了更高的要求，换一句话，也是对供配电系统的设计提出了更高的要求。
在企业中，会有部分比较重要的设备要单独有供配电系统，在钢铁公司中，类似于高炉这种就会要求有。供配电系统可以直接为其供给电源，并且有效分配有关设备的用电负荷，减少偶然发生的紧急事件给生产带来的负面效应，是保证....
