题目内容

某发电站的输出功率为104 kW,输出电压为4 kV,通过理想变压器升压后向80 km远处用户供电.已知输电线的电阻率为ρ=2.4×10-8 Ω·m,导线横截面积为1.5×10-4 m2,输电线路损失的功率为输出功率的4%,求:

(1)升压变压器的输出电压;

(2)输电线路上的电压损失.

思路解析:(1)输电线的电阻为:R=ρ                                       ①

P=P1×4%                                                                               ②

P=I22R                                                                                    ③

P2=P1                                                                                        

P2=I2U2                                                                                     

由①②③④⑤得升压变压器的输出电压:

U2=80 000 V.

(2)输电线路上的电压损失U=I2R=3 200 V.

答案:(1)80 000 V  (2)3 200 V


练习册系列答案
相关题目

违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com

精英家教网