7.3.8 Technical data
Table 69: LEXPDIS technical data
Function
Range or value Accuracy
X offset of Mho top point (–1000.00–1000.00)% of Z
Base
± 2.0% of U
r
/I
r
Diameter of Mho circle (0.01–3000.00)% of Z
Base
± 2.0% of U
r
/Ir
Timers (0.00–6000.00) s ± 0.5% ± 25 ms
Operate time 55 ms typically -
Reset ratio 105% typically -
7.4 Out-of-step protection OOSPPAM
7.4.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Out-of-step protection OOSPPAM
78
7.4.2 Functionality
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.
Consideration can be taken to the breaker trip time by parameter setting. 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.
Section 7 1MRK 502 048-UEN A
Impedance protection
160
Technical manual
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