0 200 400 600 800 1000 1200 1400
-4
-3
-2
-1
0
1
2
3
4
Time in millis econds
®
Impeda nce Z in Ohm a nd rotor a ngle in radian
®
|Z| in Ohms
angle in rad
normal
loa d
fault 500 ms
Z(R,X) cros s e d
the im pe da nce line , Z-line ,
conne cting points S E - RE
fault
occ urrs
Z(R, X) under fault lie s
on the impe da nce line
or nea r (for 3-ph faults )
Unde r 3-pha s e fa ult
condition rotor a ngle
of a p p. ±180 de gre e s
is m e a s ure d ...
rotor (power)
angle
|Z|
IEC10000110-2-en.vsd
1
2
3
1
0
IEC10000110 V2 EN-US
Figure 201: Rotor (power) angle and magnitude of the complex impedance Z(R, X) against the
time
In order to be able to fully understand the principles of OOSPPAM (78), a stable case, that is, a case
where the disturbance does not make a generator to go out-of-step, must be shown.
Section 7 1MRK 502 066-UUS B
Impedance protection
380
Technical manual
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