ABB REF 541 - Page 28

Feeder Terminal REF 541, REF 543, REF 545.
1MRS750443-MBG
28
Three-phase overvoltage protection, low-set stage, OV3Low, 3U> (59-1)
Start voltage
Operate time
Time multiplier
Operation mode
Measuring mode
Operation hysteresis
0.10…1.60 x Un
0.05…300.00 s
0.05…1.00
Not in use
Definite time
A curve
B curve
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%
Operation accuracy
Start time
Reset time
Reset ratio
Retardation time
Operate time accuracy at DT mode
Accuracy class index E at IDMT mode,
typically
Note! The values below apply when f/fn = 0.95...1.05
±35 ms
Injected voltages = 1.1 x start voltage:
internal time < 42 ms
total time < 50 ms
40...1000 ms (depends on the minimum pulse width set for
the trip output)
0.96 (range0.95...0.99)
< 50 ms
±2% of set value or ±20 ms
±20 ms
Three-phase overvoltage protection, high-set stage, OV3High, 3U>> (59-2)
Start voltage
Operate time
Operation mode
Measuring mode
Operation hysteresis
0.10…1.60 x Un
0.05…300.00 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%
Operation accuracy
Start time
Reset time
Reset ratio
Retardation time
Operate time accuracy at DT mode
Note! The values below apply when f/fn = 0.95...1.05
±2.5% of set value
Injected voltages = 1.1 x start voltage:
internal time < 42 ms
total time < 50 ms
40...1000 ms (depends on the minimum pulse width set for
the trip output)
0.96 (range 0.95...0.99)
< 50 ms
±2% of set value or ±20 ms
Three-phase undervoltage protection, low-set stage, UV3Low, 3U< (27-1)
Start voltage
Operate time
Time multiplier
Operation mode
Measuring mode
Operation hysteresis
0.10…1.20 x Un
0.1…300.0 s
0.1…1.0
Not in use
Definite time
C curve
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%