电力系统短路电流计算。
= 3.062 ms T′=e
[(R
a
′+Xe)2] Xd Td′+Re)2+(Xd
′+Xe) Xd
(Ra+Re)2+(Xd′+Xe)(Xd
=(40.208+3201.523)×637.09×80
(40.208+56.582×637.527)×56.145
= 81.49 ms
Tdce=
Tdc+1000Xe/(2πfRa)
1+Re/Ra
1+1.161/5.18
=22+1000×0.437/(100π×5.18) =18.191 ms G3: [(Ra+Re)2+(Xd′′+Xe)2] Xd′ Td′′
Te′′=
(Ra+Re)2+(Xd′′+Xe)(Xd′′′+Xe) Xd
=
(112.9756+2635.282)×87.04×3
(112.9756+4501.412)×50.688
= 3.068 ms
Te′=
=
[(R
a
′+Xe)2] Xd Td′+Re)2+(Xd
2
(Ra+Re)′+Xe)(Xd+Xe) Xd′+(Xd
(112.9756+7689.01)×1617.92×49 (112.9756+87.687×1618.567)×87.04
= 50.03 ms
Tdce=
=
Tdc+1000Xe/(2πfRa)
1+Re/Ra
20+1000×0.647/(100π×8.909)
1+1.72/8.909
2
G1、G2:
=16.957 ms
t =10 ms时的短路电流计算
′′ IKde′) e IacG=(IKde
t/Te′′
′ IKd) e t/Te′+IKd +(IKd
= (7.445 4.618) e 10/3.062+(4.618 2.4) e 10/81.49+2.4 = 4.47 kA idcG=
′′ Ir sin r) e t/Tdce 2(IKde
=2(7.445 0.75×0.6)e 10/18.191
= 5.689 kA ipG=
2IacG+idcG
=2×4.47+5.689
=12.01 kA G3:
′′ IKde′) e t/Te′′+(IKd′ IKd) e t/Te′+IKd IacG=(IKde
=(4.738 2.936) e 10/3.068+(2.936 1.4) e 10/50.03+1.4 =2.727 kA
′′ Ir sin r) e t/Tdce idcG=2(IKde