ABB SPAC 531 C User Manual And Technical Description page 120

Technical data
18
Low-set overcurrent stage I>
Start current I>
Start time, typically
Operate time t> at definite time
characteristic
Time/current curves at inverse
time characteristic (IDMT)
Time multiplier k
Reset time, typically
Retardation time
Drop-off/pick-up ratio, typically
Operation time accuracy at
definite time operation characteristic
Operation time accuracy class E at
inverse time mode of operation
Operation accuracy
High-set overcurrent stage I>>
Start current I>>
Start time, typically
Operation time t>>
Reset time, typically
Retardation time
Drop-off/pick-up ratio, typically
Operation time accuracy
Operation accuracy
0.5...2.5 x I
n
55 ms
0.05...1.00 s, 0.5...10.0 s or
5...100 s
Extremely inverse
Very inverse
Normal inverse
Long-time inverse
0.05...1.00
60 ms
<30 ms
0.96
±2% of set value or ±25 ms
5
±3% of set value
& ∞, infinite or
2.5...20.0 x I
n
& ∞, infinite
0.5...4.0 x I
n
40 ms
0.04...1.00 s, 0.4...10.0 s or
4...100 s
60 ms
<30 ms
0.96
±2% of set value or ±25 ms
±3% of set value