摘要:本文是对1200MW火力发电厂电气部分的初步设计，该火力发电厂配有4台300MW的汽轮发电机，主要完成了电气主接线的设计、火力发电厂的发电机以及变压器型号的选择、火力发电厂短路点的选择以及短路点短路电流的计算以及火力发电厂一次设备的选择。

　　　在完成火力发电厂的电气主接线时，列出了几种可行的电气主接线方案，然后综合考虑供电可靠、经济安全、运行灵活以及各电压等级所接负荷的类别等因素，选择最佳电气主接线。根据火力发电厂的设计要求，通过计算选择最佳的发电机以及变压的型号。选择通过电器和导体的短路电流为最大的点作为短路计算点，然后通过化简各短路点电力系统的等值电路图，对短路点进行短路点短路电流计算。火力发电厂一次设备主要包括高压断路器、隔离开关、电流互感器、电压互感器、母线以及电厂的防雷保护，按照设备正常工作额定电压、额定电流等条件进行选择，最后依据短路条件进行热稳定度校验和动稳定度校验。

　　　最终完成1200MW火力发电厂的电气部分的初步设计，该火力发电的电力系统能够安全、经济、可靠的运行。

关键词：发电厂；电力系统；电气主接线；一次设备

Abstract:This article is a 1200MW thermal power plant electrical part of the preliminary design, the thermal power plant with four units of 300MW turbine generator, completed the design of the main electrical wiring, thermal power plant generator and transformer models of choice, short-circuit point short-circuit current calculation of the power plant the short circuit point and the thermal power plant equipment selection.  In the completion of the thermal power plant the main electrical wiring, listed several possible main electrical wiring, and then considering the reliability of electricity supply, economic security, flexible operation, and the voltage level of the connected load category and other factors, to select the best The main electrical wiring. Select the best generator and transformer models by calculating the thermal power plant design requirements. Select short-circuit current through the electrical conductor for maximum points as the short circuit calculation, and then by the equivalent circuit diagram of simple short-circuit point of power system short-circuit point short circuit current calculation, the short circuit point. The first thermal power plant equipment, mainly including high-voltage circuit breakers, isolating switches, current transformers, voltage transformers, lightning protection for bus and power plants, in accordance with the equipment work properly rated voltage, rated current and other conditions selection, and finally based on the short-circuit conditions calibration of the thermal stability and dynamic stability of calibration.   The final completion of the preliminary design of the electrical part of the 1200MW thermal power plant, the thermal power system could operation of safe, economical and reliable. 

Key words: Power plant;Power system;Main electrical wiring;Primary equipment