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.
7.17
Out-of-step protection OOSPPAM
GUID-8321AC72-187C-4E43-A0FC-AAC7829397C3 v1
7.17.1
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
7.17.2
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.
SM1
Synchronous
machine 1
Centre of oscillation
U, I
SM2
E1
E2
Synchronous
machine 2
E1
E2
Voltages of all
phases to
earth are zero
in the centre
of oscillation
SM1
Synchronous
machine 1
Centre of oscillation
U, I
SM2
E1
E2
Synchronous
machine 2
E1
E2
Voltages of all
phases to
earth are zero
in the centre
of oscillation
IEC10000107-1-en.vsd
IEC10000107 V1 EN-US
Figure 255: The centre of electromechanical oscillation
1MRK 505 343-UEN B
Section 7
Impedance protection
389
Application manual
Содержание Relion 670 series
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