Inverse characteristic
M12388-1 v23
Table 182. ANSI Inverse time characteristics
Function Range or value Accuracy
Operating characteristic:
EQUATION1249-SMALL V3 EN-US
Reset characteristic:
EQUATION1250-SMALL V1 EN-US
I = I
measured
/I
set
0.05 ≤ k ≤ 999.00
1.5 x I
set
≤ I ≤ 20 x I
set
ANSI/IEEE C37.112 ,
±2.0% or ±40 ms
whichever is greater
ANSI Extremely Inverse A=28.2, B=0.1217, P=2.0 , tr=29.1
ANSI Very inverse A=19.61, B=0.491, P=2.0 , tr=21.6
ANSI Normal Inverse A=0.0086, B=0.0185, P=0.02, tr=0.46
ANSI Moderately Inverse A=0.0515, B=0.1140, P=0.02, tr=4.85
ANSI Long Time Extremely Inverse A=64.07, B=0.250, P=2.0, tr=30
ANSI Long Time Very Inverse A=28.55, B=0.712, P=2.0, tr=13.46
ANSI Long Time Inverse A=0.086, B=0.185, P=0.02, tr=4.6
Generator protection REG670
1MRK 502 074-BEN M
Hitachi Power Grids 131
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