ABB RELION 670 Series Technical Manual page 1396

Section 26
Inverse time characteristics
Table 1079:ANSI Inverse time characteristics for Sensitive directional residual overcurrent and power protection
Function
Operating characteristic:
æ
ç
=
t
(
ç
è
I
EQUATION1651 V1 EN-US
Reset characteristic:
t r
=
t
(
2
I
EQUATION1652 V1 EN-US
I = I
measured
ANSI Extremely Inverse
ANSI Very inverse
ANSI Normal Inverse
ANSI Moderately Inverse
ANSI Long Time Extremely Inverse
ANSI Long Time Very Inverse
ANSI Long Time Inverse
1390
ö
A
÷
+ ×
B td
)
÷
P
- ø
1
×
td
)
-
1
/I
set
Range or value
0.05 ≤ k ≤ 2.00
1.5 x I ≤ I ≤ 20 x I
set set
A=28.2, B=0.1217, P=2.0 , tr=29.1
A=19.61, B=0.491, P=2.0 , tr=21.6
A=0.0086, B=0.0185, P=0.02, tr=0.46
A=0.0515, B=0.1140, P=0.02, tr=4.85
A=64.07, B=0.250, P=2.0, tr=30
A=28.55, B=0.712, P=2.0, tr=13.46
A=0.086, B=0.185, P=0.02, tr=4.6
1MRK 502 066-UUS B
GUID-19F8E187-4ED0-48C3-92F6-0D9EAA2B39BB v4
Accuracy
ANSI/IEEE C37.112 ,
±5.0% or ±160 ms
whichever is greater
Technical manual