ABB RELION REX640 - 4.2.4.11 Technical data; 4.2.5 Rotor earth-fault protection, injection method MREFPTOC (ANSI 64 R); 4.2.5.1 Identification; 4.2.5.2 Function block

Name Type Values (Range) Unit Description
5=off
4.2.4.11 Technical data
Table 574: EFPADM Technical data
Characteristic Value
Operation accuracy
1
At the frequency f = f
n
±1.0% or ±0.01 mS
(In range of 0.5...100 mS)
Start time
2
Minimum Typical Maximum
56 ms 60 ms 64 ms
Reset time 40 ms
Operate time accuracy ±1.0% of the set value of ±20 ms
Suppression of harmonics -50 dB at f = n × f
n
, where n = 2, 3, 4, 5,…
4.2.5 Rotor earth-fault protection, injection method MREFPTOC
(ANSI 64R)
4.2.5.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Rotor earth-fault protection, injec-
tion method
MREFPTOC Io>R 64R
4.2.5.2 Function block
Figure 296: Function block
4.2.5.3 Functionality
The rotor earth-fault protection, injection method, function MREFPTOC is used to
detect an earth fault in the rotor circuit of synchronous machines. MREFPTOC is
used with the injection device REK510, which requires a secured 58, 100 or 230 V AC
1
U
o
= 1.0 × U
n
.
2
Includes the delay of the signal output contact, results based on statistical distribution of 1000
measurements.
1MRS759142 F Protection functions
REX640
Technical Manual
515