火力发电厂电气部分设计

毕业设计论文

论文题目：300MW机组火力发电厂电气部分设计

摘要

由发电、变电、输电、配电用电等环节组成的电能生产与消费系统它的功能是将自然界的一次能源通过发电动力装置转化成电能，再经过输、变电系统及配电系统将电能供应到各负荷中心。

电气主接线反映了发电机、变压器、线路、断路器和隔离开关等有关电气设备的数量、各回路中电气设备的连接关系及发电机、变压器与输电线路、负荷间以怎样的方式连接，直接关系到电力系统的可靠性、灵活性和安全性，直接影响发电厂、变电所电气设备的选择，配电装置的布置，保护与控制方式选择和检修的安全与方便性。而且电能的使用已经渗透到社会、经济、生活的各个领域，而在我国电源结构中火电设备容量占总装机容量的75%。本次设计是针对一台300MW机组火力发电厂电气部分的设计。在本次毕业论文设计当中介绍了有关发电厂的一些电气设备如发电机、变压器、断路器、电压互感器、电流互感器和电动机等以及介绍了主变的选择和短路电流的计算条件，最后介绍防雷的重要性以及防雷的有效措施。因此，我们在电厂以后的工作当中一定要时刻保持安全和认真的态度。

本文对发电厂的主要一次设备进行了选择，并根据短路电流计算，通过电器设备的短路动稳定、热稳定性对主要设备进行了校验。在主接线设计中，我们把两种接线方式在经济性，灵活性，可靠性三个方面进行比较，最后选择双母线接线方式。

关键词：电气设备,发电机,变压器，电力系统，

ABSTRACT

By power、generation、substation,、transmission and distribution of electricity, electricity production and consumption system, its functio n is the nature of primary energy into electricity by electric power equipment, after losing, substation and power distribution system will be power supply to the load center.

Reflects the main electrical wiring generators, transformers, lines, the number of circuit breaker and isolating switch and related electrical equipment, electrical equipment in each circuit connection relationship and generator, transformer and transmission lines, in which way the load between connections, is directly related to reli ability, flexibility and security of power system, directly affect the choice of the electrical

equipment for power plants, substations, power distribution equipment arrangement, protection and control mode selection and maintenance of safety and convenience. And the use of electricity has penetrated into every field of society, economy, life, and the power structure in our country accounted for 75% of total installed capacity of thermal power equipment capacity. This design is for a 300 mw thermal power pl ant electrical part design. In the design of the graduation thesis introduces related to power plant electrical equipment such as generator, transformer, circuit breaker, voltage transformer, current transformer and motor etc, and introduces the selection of main transformer and the calculation of short-circuit current condition, finally presents the importance of lightning protection and effective measures of lightning protection. Therefore, we in the midst of the power plant after work must keep safety an d serious attitude.

In this paper, a main equipment of power plant selection, and according to the current calculation, using electrical equipment of dynamic stability, thermal stability of the short circuit to the main equipment calibration. In the main wiring design, we put the two connection mode in economy, flexibility, reliability, comparing three aspects, and finally choose double connection mode.

Keywords:electrical equipment, generator, transformer, power system, relay protection