ABB RET 541 Product Manual page 26

26
Transformer Terminal
Residual overvoltage protection, high-set stage, ROV1High, U
instantaneous stage, ROV1Inst, U
Start voltage
Operate time
Operation mode
Measuring mode
Operation accuracy
Start time
- injected voltages
- internal time
- total time
Reset time
Reset ratio, typically
Retardation time
Operate time accuracy at DT mode
RET 541, RET 543, RET 545
>>>
0
2.0...80.0% of Un
0.05...300.00 s
Not in use
Definite time
Peak-to-peak
Fundamental frequency
Note! The values below apply when f/fn = 0.95...1.05
±2.5% of set value or ±0.01 x Un
>2 x start voltage
<32 ms
<40 ms
40...1000 ms (depends on the minimum pulse width set for
the trip output)
0.95
Total time for blocking: < 25 ms
Total time when voltage drops below start value: < 50 ms
±2% of set value or ±20 ms
1MRS755543
>>, and
0