Functionality - ABB Relion Technical Manual

Section 7
Impedance protection
7.4.2
7.4.3
7.4.4
174

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