ABB RET 541 - Page 30

Three-phase undervoltage protection, high-set stage, UV3High, 3U<<
Start voltage
Operate time
Operation mode
Measuring mode
Operation hysteresis
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%
Operation accuracy
Start time:
- injected voltages
- internal time
- total 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 or ±0.01 x Un
<0.5 x start voltage:
<32 ms
<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
Phase-sequence voltage protection, PSV3St1 and PSV3St2, U
1
<, U
2
>, U
1
>
Start value U2>
Start value U1<
Start value U1>
Operate time U2>
Operate time U1<
Operate time U1>
Operation mode
Rotation direction selection
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
Operation accuracy
Trip time, U2> operation:
- Injected negative-sequency voltage
- internal time
- total time
Trip time, U1< operation:
- injected positive-sequency voltage
- internal time
- total time
Trip time, U1> operation:
- Injected positive-sequency voltage
- internal time
- total time
Reset time
Reset ratio, typically
Retardation time
Operate time accuracy
Note! The values below apply when f/fn = 0.95...1.05
± 2.5% of set value or ± 0.01 x Un
= 1.1 x start value
<42 ms
<50 ms
= 0.50 x start value
<32 ms
<40 ms
= 1.1 x start value
<42 ms
<50 ms
70...1030 ms (depends on the minimum pulse width
set for the TRIP output)
U2> operation: 0.96
U1< operation: 1.04
U1> operation: 0.99
<45 ms (for all operations)
± 2% of set value or ± 20 ms
Transformer Terminal RET 541, RET 543, RET 545
1MRS755543
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