7.2
Out-of-step protection OOSPPAM (78)
7.2.1
Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Out-of-step protection
OOSPPAM
<
78
7.2.2
Functionality
The out-of-step protection OOSPPAM (78) function in the IED can be used for both
generator protection and as well for line protection applications.
The main purpose of the OOSPPAM (78) function is to detect, evaluate, and take the
required action during pole slipping occurrences in the power system.
The OOSPPAM (78) function detects pole slip conditions and trips the generator as fast
as possible, after the first pole-slip if the center of oscillation is found to be in zone 1,
which normally includes the generator and its step-up power transformer. If the center of
oscillation is found to be further out in the power system, in zone 2, more than one pole-
slip is usually allowed before the generator-transformer unit is disconnected. A parameter
setting is available to take into account the circuit breaker opening time. If there are several
out-of-step relays in the power system, then the one which finds the center of oscillation
in its zone 1 should operate first.
Two current channels I3P1 and I3P2 are available in OOSPPAM function to allow the
direct connection of two groups of three-phase currents; that may be needed for very
powerful generators, with stator windings split into two groups per phase, when each
group is equipped with current transformers. The protection function performs a simple
summation of the currents of the two channels I3P1 and I3P2.
1MRK 511 365-UUS A
Section 7
Impedance protection
Phasor measurement unit RES670 2.1 ANSI
155
Technical manual
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