ABB REX 521 Technical Reference Manual, Standard Configurations page 77

1MRS 751802-MUM Protection Relay
Technical Reference Manual, Standard Configurations
Non-directional earth-fault protection, low-set stage, Io>
Start current
Operate time in DT mode
Time multiplier in IDMT mode
IEEE time dial in IDMT mode
Operation mode
Measuring mode
Drop-off time of the operate time counter
Operation accuracy
Start time
Reset time
Reset ratio, typically
Retardation time
Operate time accuracy in DT mode
Accuracy class index E in IDMT mode
Non-directional earth-fault protection, high-set stage, Io>>, and instantaneous stage,
Io>>>
Start current
Operate time
Operation mode
Measuring mode
Drop-off time of the operate time counter
Operation accuracy
Operate time
Reset time
Reset ratio, typically
Retardation time
Operate time accuracy in DT mode
1.0...100.0% of In
0.05...300.00 s
0.05...1.00
0.5...15.0
Not in use
Definite time
Extremely inverse
Very inverse
Normal inverse
Long time inverse
RI-type inverse
RD-type inverse
IEEE Ext. inv.
IEEE Very inv.
IEEE Inverse
IEEE S.T. inv.
IEEE S.T.E. inv
IEEE L.T.E. inv
IEEE L.T.V. inv
IEEE L.T. inv.
Peak-to-peak
Fundamental frequency
0...1000 ms
Note! The values below apply when f/fn = 0.95...1.05
±2.5% of set value + 0.0005 x In
Injected currents > 2.0 x start current:
internal time < 32 ms
total time < 40 ms
40...1000 ms (depends on the minimum pulse width set
for the trip output)
0.95
< 45 ms
±2% of set value or ±20 ms
Class index E = 5.0 or ±20 ms
0.10...12.00 x In
0.05...300.00 s
Not in use
Definite time
Instantaneous
Peak-to-peak
Fundamental frequency
0...1000 ms
Note! The values below apply when f/fn = 0.95...1.05
±2.5% of set value or + 0.01 x In
Injected currents > 2.0 x start current:
internal time < 32 ms
total time < 40 ms
40...1000 ms (depends on the minimum pulse width set
for the trip output)
0.95
< 45 ms
±2% of set value or ±20 ms
REX 521
77