Signals - ABB RELION REX640 Technical Manual

1MRS759142 C
4.7.3.7
REX640
Technical Manual
-R
Relay operation
characteristics
GUID-0EE0C3EF-974A-4E83-A7EC-E10AAFC3B61A V1 EN
Figure 508: Typical impedance locus in underexcitation: a) heavy load b) light
load c) fault in the network

Signals

Table 870: UEXPDIS Input signals
Name Type
I3P SIGNAL
U3P SIGNAL
BLOCK BOOLEAN
EXT_LOS_DET BOOLEAN
Table 871: UEXPDIS Output signals
Name Type
OPERATE BOOLEAN
START BOOLEAN
X (Reactance)
c
a
a) Z locus in under excitation for heavily loaded machine
b) Z locus in under excitation for lightly loaded machine
-X
c) Z locus for a fault in the network
Default Description
- Three-phase currents
- Three-phase voltages
0=False Block signal for activating the blocking mode
0=False External signal for excitation loss detection
Description
Operate
Start
Section 4
Protection functions
R (Resistance)
b
939