电力系统短路电流计算。
G3:
′′=(Eqo
UU
′′Ir)2 cos r+RaIr)2+(sin r+Xd
33
3
=(400×0.8+8.909×0.451)2+(400×0.6+50.688×0.451)2 = 248.377 V
′=(Eqo
UrU
′Ir)2 cos r+RaIr)2+(rsin r+Xd
33
3
=(400×0.8+8.909×0.451)2+(400×0.6+87.04×0.451)2
= 259.332 V
A.3.4 发电机的短路电流计算
1 I″Kde、I′Kde、T″e、T′e和Tdce的计算: (1) I″Kde和I′Kde: G1、G2:
′′=IKde
′′Eqo
′′+Xe)(Ra+Re)+(Xd
250.314
(5.18+1.161)2+(32.582+0.437)2
2
2
=
=7.445 kA
′=IKde
′Eqo
′+Xe)2(Ra+Re)2+(Xd
262.908
5.18+1.161)2+(56.145+0.437)2
=
= 4.618 kA G3: I′′=
Kde
=
′′Eqo
′′+Xe)2(Ra+Re)2+(Xd
248.377
(8.909+1.72)+(50.688+0.647)
2
2
= 4.738 kA I′=
Kde
=
′Eqo
′+Xe)2Ra+Re)2+(Xd
259.332
(8.909+1.72)+(87.04+0.647)
2
2
= 2.936 kA
(2) T″e、T′e和Tdce
G1、G2: T′′=
e
[(R
a
′′+Xe)2] Xd′ Td′′+Re)2+(Xd
(Ra+Re)2+(Xd′′+Xe)(Xd′′′+Xe) Xd
=(40.208+1090.254)×56.145×3
(40.208+33.019×56.582)×32.582