Tabla de contenido
T1
El
Em
+
El"
-
JX"l
JXT1
+
Em"
JX"m
JXT3
-
a) Three-phase short circuit
Ifl" →
Ifm"
↑
JXl-thevenin
JXm-thevenin
Figura 3-8. La sustracción de carga previa al fallo elimina los ángulos generadores.
RFL 9300
25 de agosto de 2000
B e c a u s e R F L ™ a n d H u b b e l l ® h a v e a p o l i c y o f c o n t i n u o u s p r o d u c t i mp r o v e me n t , we r e s e r v e t h e r i g h t t o c h a n g e d e s i g n s a n d s p e c i fi c a t i o n s wi t h o u t n o t i c e .
Single line diagram of system
L
M
f
JXl
JXr
JXT2
Fault
JXm
← Ifr"
JXr-thevenin
↓ If" - fault current
-
Vf
+
c)
Application of superposition
Three phase fault
Il" →
J(XT1+Xl+X"l)
↑
J(XT3+Xm+X"m)
JX"r
Im"
+
+
+
Er"
E1"
-
-
-
b) Short circuit represented by two opposing voltage sources
Ill" →
JXl-thevenin
↑
Iml"
JXm-thevenin
+
+
El"
-
-
Iload – pre-fault load
JXI-thevenin
+
E1"
-
e) Vf set equal to prefault voltage at fault
3-7
T2
R
← Ir"
+
J(XT2+Xr)
Vf
-
-
Vf
Em"
+
← Irl"
+
JXr-thevenin
Vf
-
Em"
d)
→
JXr-thevenin
↑
Iml"
JXm-thevenin
+
Em"
-
RFL Electronics Inc.
(973) 334-3100
Er
JX"r
+
Er"
-
+
Er"
-
Tabla de contenido
