Rotor Earth-Fault Protection Mrefptoc - ABB RELION 620 Series Technical Manual

Protection functions
4.2.4.9 Monitored data
Table 442: EFPADM Monitored data
Name
START_DUR
FAULT_DIR
COND_RES
SUS_RES
EFPADM
4.2.4.10 Technical data
Table 443: EFPADM Technical data
Characteristic
Operation accuracy
Start time
Reset time
Operate time accuracy
Suppression of harmonics
4.2.5

Rotor earth-fault protection MREFPTOC

1
Uo = 1.0 × Un.
2
Includes the delay of the signal output contact, results based on statistical distribution of 1000
measurements.
454
Type Values (Range)
FLOAT32 0.00...100.00
Enum
0=unknown
1=forward
2=backward
3=both
FLOAT32 -1000.00...1000.0
0
FLOAT32 -1000.00...1000.0
0
Enum
1=on
2=blocked
3=test
4=test/blocked
5=off
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
Unit Description
% Ratio of start
time / operate
time
Detected fault
direction
mS Real part of cal-
culated neutral
admittance
mS Imaginary part of
calculated neu-
tral admittance
Status
n
Typical Maximum
60 ms 64 ms
, where n = 2, 3, 4, 5,...
n
Technical Manual
1MRS757644 H
620 series