ABB REX 521 Technical Reference Manual, Standard Configurations page 82

REX 521
82
Protection Relay
Technical Reference Manual, Standard Configurations
Three-phase over voltage protection, low-set stage, 3U>
Start voltage
Operate time
Operation mode
Time multiplier
Measuring mode
Operation accurcy
Start time
Reset time
Reset ratio, typically
Retardation time
Operate time accuracy in DT mode
Accuracy class index E in inverse-time mode ± 20 ms or the accuracy appearing when the measured
Three-phase over voltage protection, high-set stage, 3U>>
Start voltage
Operate time
Operation mode
Measuring mode
Operation accurcy
Start time
Reset time
Reset ratio, typically
Retardation time
Operate time accuracy in DT mode
0.10...1.60 x Un
0.05...300.00 s
Not in use
Definite time
A curve
B curve
0.05...1.00
Mode 1 (Phase-to-phase voltages / Peak-to-peak meas.)
Mode 2 (Phase-to-phase voltages / Fundam.freq.)
Mode 3 (Phase-to-earth voltages / Fundam.freq.)
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
(Depends on the value of the "Oper. hysteresis"
parameter)
< 50 ms
±2% of set value or ±20 ms
voltage varies ±2.5%
0.10...1.60 x Un
0.05...300.00 s
Not in use
Definite time
Mode 1 (Phase-to-phase voltages / Peak-to-peak meas.)
Mode 2 (Phase-to-phase voltages / Fundam.freq.)
Mode 3 (Phase-to-earth voltages / Fundam.freq.)
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
(Depends on the value of the "Oper. hysteresis"
parameter)
< 50 ms
±2% of set value or ±20 ms
1MRS 751802-MUM