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7.4.2
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.
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.
7.4.3
Function block
ANSI10000106-1-en.vsd
OOSPPAM (78)
I3P*
V3P*
BLOCK
BLKGEN
BLKMOT
EXTZONE1
TRIP
TRIPZ1
TRIPZ2
RI
GENMODE
MOTMODE
R
X
ANSI10000106 V2 EN
Figure 75:
OOSPPAM (78) function block
7.4.4
Signals
Table 70:
OOSPPAM (78) Input signals
Name
Type
Default
Description
I3P
GROUP
SIGNAL
-
Group connection for three-phase current input
U3P
GROUP
SIGNAL
-
Group connection for three-phase voltage input
BLOCK
BOOLEAN
0
Block of function
BLKGEN
BOOLEAN
0
Block operation in generating direction
BLKMOT
BOOLEAN
0
Block operation in motor direction
EXTZ1
BOOLEAN
0
Extension of zone1 reach to zone2 settings
Section 7
1MRK 502 048-UUS A
Impedance protection
174
Technical manual
Summary of Contents for 650 series
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