学校配电系统 摘 要

摘要

本次设计题目为某市实验中学供配电系统设计，该系统通过降压变压器与10kv 公共电源干线相连，向学校供给电能。该校对供电可靠性要求也较高。因此，必须采用可靠性较高的接线形式。

本次设计主要内容包括：负荷计算、短路电流计算、电气主接线的设计、电气设备的选择与校验（包括主变压器的选择、断路器及隔离开关的选择与校验、导体的选择与校验、电流互感器的选择与校验、电压互感器的选择和避雷器的选择等）和变配电所的布置与结构设计。其中，主接线代表了变配电所主体结构，它对各种电气设备的选择、配电装置的布置、继电保护、自动装置和控制方式的拟定都有决定性的关系，并将长期影响电力系统运行的可靠性、安全性、灵活性和经济性。

在设计的过程中，本人参阅了大量的供配电系统设计、变配电所设计、建筑电气设计规范等相关的规范和设计手册，最后对该校供配电系统进行了初步设计。本设计为毕业设计，其目的是通过设计实践，综合运用所学知识，理论联系实际，锻炼独立分析和解决电气设计问题的能力，为未来的工作奠定坚实的基础。

关键词：变压器电气主接线电气设备

Abstract

This design topic is the power supply and distribution system for a experimental high school of A city, this system is connected with the public line of 10kV through step-down transformers, and distribute electrical power to experimental high school of A city. The experimental high sch ool of A city electrical charge is big , and the school’ demand of reliability of power supply is high, using the high reliable wiring form.

This design main content includes: the charge computation, short-circuit current computation, electrical main wiring design, electrical equipment choice and verification (including main voltage transformer choice, circuit breaker and disconnecting switch with check-up, conductor choice with check-up, current transformer choice with check-up, voltage transformer choice with check-up and lightning protector choice and so on),the disposal and configuration of the transformer substation design. Between them, the electrical main wiring has represented the main bodies structure of the substation, it has the decisive relations about the electrical equipment choice, the power distribution equipment arrangement, the relay protection, the decision of automatic device and the control mode ,and it has long-term influence about the reliability，security，flexibility and efficiency of the electrical power system movement.

In order to finish the design, I referring to the power supply and distribution design standard, the transformer substation design standard，the electrical design standard of architecture and so on, carry on the preliminary design to this power system. This design is a graduation design .The purpose of this design is to give us a chance of synthetical usage of the knowledge we have learned. Besides, it can train our ability to analyze and solve practical problems in Construct electricity in dependently so that the theory is connected with practice and a solid base is made in favor of future work.

Key words: transformer, electrical main wiring,electrical equipment