Rotor Earth-Fault Protection, Injection Method Mrefptoc (Ansi 64R) - ABB RELION REX640 Technical Manual

1MRS759142 F
Name Type
4.2.4.11 Technical data
Table 574: EFPADM Technical data
Characteristic
Operation accuracy
Start time
Reset time
Operate time accuracy
Suppression of harmonics
4.2.5 Rotor earth-fault protection, injection method MREFPTOC
(ANSI 64R)
4.2.5.1 Identification
Function description
Rotor earth-fault protection, injec-
tion method
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 = 1.0 × U .
o n
2
Includes the delay of the signal output contact, results based on statistical distribution of 1000
measurements.
REX640
Technical Manual
Values (Range)
5=off
1
2
Unit
Value
At the frequency f = f
±1.0% or ±0.01 mS
(In range of 0.5...100 mS)
Minimum
56 ms
40 ms
±1.0% of the set value of ±20 ms
-50 dB at f = n × f
IEC 61850 IEC 60617
identification identification
MREFPTOC Io>R
Protection functions
Description
n
Typical Maximum
60 ms 64 ms
, where n = 2, 3, 4, 5,...
n
ANSI/IEEE C37.2
device number
64R
515