Functionality - ABB REG650 Technical Manual

Section 7
Impedance protection
7.3.2
7.3.3
7.3.4
7.3.4.1
148

Functionality

Out-of-step protection (OOSPPAM, 78) function in the IED can be used both for
generator protection application as well as, 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. 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 67: OOSPPAM (78) function block
Signals
OOSPPAM InputSignals
Table 53: Input signals for the function block OOSPPAM (PSP1-)
Signal
I3P
U3P
BLOCK
BLKGEN
BLKMOT
EXTZONE1
Description
Group connection for three-phase current input
Group connection for three-phase voltage input
Block of function
Block operation in generating direction
Block operation in motor direction
Extension of zone1 reach to zone2 settings
1MRK 502 043-UUS B
Technical Manual