ABB REF 541 Product Manual page 29

Feeder Terminal
Operation accuracy
Start time
Reset time
Reset ratio
Retardation time
Operate time accuracy at DT mode
Accuracy class index E at IDMT mode,
typically
Three-phase undervoltage protection, high-set stage, UV3High, 3U<< (27-2)
Start voltage
Operate time
Operation mode
Measuring mode
Operation hysteresis
Operation accuracy
Start time
Reset time
Reset ratio
Retardation time
Operate time accuracy at DT mode
Phase-sequence voltage protection, PSV3St1 and PSV3St2, U
Start value U2>
Start value U1<
Start value U1>
Operate time U2>
Operate time U1<
Operate time U1>
Operation mode
Dir. selection
REF 541, REF 543, REF 545.
Note! The values below apply when f/fn = 0.95...1.05
±35 ms
Injected voltages < 0.5 x start voltage:
internal time < 32 ms
total time < 40 ms
40...1000 ms (depends on the minimum pulse width set for
the trip output)
1.04 (range 1.01...1.05)
< 60 ms
±2.5% of set value
±35 ms
0.10...1.20 x Un
0.1...300.0 s
Not in use
Definite time
Phase-to-phase voltages; peak-to-peak measurement
Phase-to-phase voltages; fundamental freq. measurement
Phase-to-earth voltages; fundamental freq. measurement
1.0...5.0%
Note! The values below apply when f/fn = 0.95...1.05
±2.5% of set value
Injected voltages < 0.5 x start voltage:
internal time < 32 ms
total time < 40 ms
40...1000 ms (depends on the minimum pulse width set for
the trip output)
1.04 (range 1.01...1.05)
< 60 ms
±2.5% of set value
U < >_1,U
1 2
0.01...1.00 x Un
0.01...1.20 x Un
0.80...1.60 x Un
0.04...60.00 s
0.04...60.00 s
0.04...60.00 s
Not in use; U1< & U2> & U1>; U1< & U2>; U2> & U1>;
U1< & U1>; U2>; U1<; U1>
Forward; Reverse; Input ROT_DIR
1MRS750443-MBG
U < >_2 (47-1, 47-2)
1 2
29