计算题:某一220KV线路,全长L=57.45Km进行零序阻抗试验时,测得零序电压U0=516V,零序电流I0=25A,零序电阻,零序阻抗和零序电感。
正确答案:
解:(1)零序阻抗Z0=3U0/I0×1/L=3×516/25×1/57.45
=1.078(Ω/Km/φ)
(2)零序电阻R0=3P0/I02×1/L
=3×3220/252×1/57.45=0.269(Ω/Km/φ)
(3)零序电抗X0=(Z02-R02)
=(1.0782-0.2692)=1.044(Ω/Km/φ)
(4)零序电感L0=X0/2πf=1.044/(2×3.14×50)
=0.00332(H/Km/φ)
答:每相每公里的零序阻抗为1.078Ω/Km/φ,零序电阻为0.269Ω/Km/φ,
零序电抗1.044Ω/Km/φ,零序电感是0.00332H/Km/φ。
=1.078(Ω/Km/φ)
(2)零序电阻R0=3P0/I02×1/L
=3×3220/252×1/57.45=0.269(Ω/Km/φ)
(3)零序电抗X0=(Z02-R02)
=(1.0782-0.2692)=1.044(Ω/Km/φ)
(4)零序电感L0=X0/2πf=1.044/(2×3.14×50)
=0.00332(H/Km/φ)
答:每相每公里的零序阻抗为1.078Ω/Km/φ,零序电阻为0.269Ω/Km/φ,
零序电抗1.044Ω/Km/φ,零序电感是0.00332H/Km/φ。
答案解析:有
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