摘要本课题设计是火力发电厂及地区电网电气部分设计，根据任务书和原始资料初步拟定几种地区电网的接线方案。再经过技术经济的比较，包括计算平衡功率，选择导线型号并校验截面积，潮流计算等最后选择出最合理可行的接线方案。然后根据优选方案来确定火力发电厂及水力发电厂的发电机和主变压器型号参数以及电气主接线形式。对 10KV,35KV,220KV 这三个电压等级的母线进行短路电流计算，并进行电气设备的选择和校验。最后为了确保各线路和电气设备的正常安全运行，有必要设置继电保护装置。 21136
关键词 地区电网接线 电气主接线 短路电流计算 设备的选择和校验 继电保护装置
Title Coal-fired power plants and regional power grid electrical part design
Abstract
This subject is designed to coal-fired power plants and regional power grid
electrical part design. Several regional power grid connection scheme are
made according to the specification and the original data . Through the
comparison of technical economy, including calculating the balance of
power, selecting the wire type and calibration cross-sectional area, power
flow calculation, etc. At last choose the most reasonable wiring scheme.
Then according to the optimal scheme to determine the generators of thermal
power plants and hydroelectric and the main transformer model parameters
and the main electrical wiring forms. Short-circuit current calculation
on 10 kv, 35 kv, 220 kv busbar of the three voltage grade, and the selection
of electrical equipment and calibration. Finally, in order to ensure the
normal safe operation of each line and electric equipments, it is necessary
to set relay protection device.
Keywords regional power grid connection the main electrical wiring
short circuit current calculation equipment selection and
validation relay protection device
目 录
1 引言 1
1.1 课题设计背景 1
1.2 毕业设计的主要步骤 1
2 确定地区电网接线方案 2
3 发电机及变压器的选择 6
3.1 发电机的选型 6
3.2 变压器的选型 6
3.2.1 确定火电厂的主变压器 6
3.2.2 确定水电厂主变压器 7
4 确定发电厂电气主接线 8
4.1 火力发电厂的电气主接线的确定 8
4.2 水电厂电气主接线确定 9
5 短路电流的计算. 10
5.1 短路的原因及后果. 10
5.2 短路的种类. 10
5.3 各元件电抗标幺值计算. 11
5.4 K1 点(220kV 母线)短路电流计算. 14
5.4.1 电源(S(1)、S(2))供给的短路电流 15
5.4.2 电源( （ ）)供给的短路电流 15
5.4.3 电源(S(4，5))供给的短路电流. 16
5.4.4 大系统电源(S∞)供给的短路电流. 16
5.4.5 各电源供给的短路电流汇总表. 16
5.5 K2(35KV 母线)短路电流计算 17
5.5.1 电源(S1、S2)供给的短路电流 19
5.5.2 电源(S3)供给的短路电流 . 19
5.5.3 电源(S(4,5))供给的短路电流 . 20
5.5.4 大系统电源(S∞)供给的短路电流. 20
5.5.5 各电源供给的短路电流汇总表. 21
5.6 K3(10kV 母线)短路电流计算 21
5.6.1 电源(S1、S2)供给的短路电流 21
5.6.2 电源(S3)供给的短路电流 . 22 5.6.3 电源(S(4,5))供给的短路电流 . 22
5.6.4 大系统电源(S∞)供给的短路电流. 23 火力发电厂和地区电网电气部分设计:http://www.youerw.com/zidonghua/lunwen_13215.html