For the TripAngle it is recommended to set this parameter to 90° to assure limited
stress for the circuit breaker.
If the centre of pole slip is within the generator block set N1Limit to 1 to get trip at
first pole slip.
If the centre of pole slip is within the network set N2Limit to 3 to get enable split of
the system before generator trip.
8.17 Out-of-step protection OOSPPAM
GUID-8321AC72-187C-4E43-A0FC-AAC7829397C3 v1
8.17.1 Identification
GUID-BF2F1533-BA39-48F0-A55C-0B13A393F780 v2
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Out-of-step protection OOSPPAM
78
8.17.2 Application
GUID-11643CF1-4EF5-47F0-B0D4-6715ACEEC8EC v6
Under balanced and stable conditions, a generator operates with a constant rotor
(power) angle, delivering an active electrical power to the power system, which is
equal to the mechanical input power on the generator axis, minus the small losses
in the generator. In the case of a three-phase fault electrically close to the generator,
no active power can be delivered. Almost all mechanical power from the turbine is
under this condition used to accelerate the moving parts, that is, the rotor and the
turbine. If the fault is not cleared quickly, the generator may not remain in
synchronism after the fault has been cleared. If the generator loses synchronism
(Out-of-step) with the rest of the system, pole slipping occurs. This is characterized
by a wild flow of synchronizing power, which reverses in direction twice for every
slip cycle.
The out-of-step phenomenon occurs when a phase opposition occurs periodically
between different parts of a power system. This is often shown in a simplified way
as two equivalent generators connected to each other via an equivalent
transmission line and the phase difference between the equivalent generators is 180
electrical degrees.
Section 8 1MRK 506 369-UEN B
Impedance protection
436 Line distance protection REL670 2.2 IEC
Application manual
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