degrees. It can be observed in
that the angle reaches 180 degrees when the
complex impedance Z(R, X) crosses the impedance line SE – RE. It then changes the
sign, and continues from -180 degrees to 0 degrees, and so on.
rotor (power) angle and the magnitude of Z(R, X) against time for the case from
0
200
400
600
800
1000
1200
1400
-4
-3
-2
-1
0
1
2
3
4
Time in milliseconds
→
Im
pedan
ce
Z
in
O
hm
and
ro
to
r ang
le
in
rad
ian
→
|Z| in Ohms
angle in rad
normal
load
fault 500 ms
Z(R,X) crossed
the impedance line, Z-line,
connecting points SE - RE
fault
occurrs
Z(R, X) under fault lies
on the impedance line
or near (for 3-ph faults)
Under 3-phase fault
condition rotor angle
of app. ±180 degrees
is measured ...
rotor (power)
angle
|Z|
IEC10000110-1-en.vsd
IEC10000110 V1 EN
Figure 77:
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, a stable case, that
is, a case where the disturbance does not make a generator to go out-of-step, must be
shown.
1MRK 502 048-UEN A
Section 7
Impedance protection
165
Technical manual
Summary of Contents for REG650 ANSI
Page 1: ...Relion 650 series Generator protection REG650 Technical manual ...
Page 2: ......
Page 36: ...30 ...
Page 42: ...36 ...
Page 50: ...44 ...
Page 64: ...58 ...
Page 86: ...80 ...
Page 262: ...256 ...
Page 300: ...294 ...
Page 438: ...432 ...
Page 476: ...470 ...
Page 592: ...586 ...
Page 664: ...658 ...
Page 678: ...672 ...
Page 726: ...720 ...
Page 727: ...721 ...