6.4 Out-of-step protection OOSPPAM
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6.4.1 Identification
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Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Out-of-step protection OOSPPAM
78
6.4.2 Functionality
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The out-of-step protection (OOSPPAM ) function in the IED can be used for both
generator protection and as well for line protection applications.
The main purpose of the OOSPPAM function is to detect, evaluate, and take the
required action during pole slipping occurrences in the power system.
The OOSPPAM 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 506 382-UEN A Section 6
Impedance protection
Line distance protection REL650 2.2 IEC 135
Technical manual
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