ABB RES670 Technical Manual page 896

Section 26
Inverse time characteristics
890
Table 690: ANSI Inverse time characteristics for Sensitive directional residual overcurrent and
power protection
Function
Operating characteristic:
æ ö
A
ç ÷
= + ×
t B td
( )
ç ÷
P
è - ø
I 1
EQUATION1651 V1 EN-US
Reset characteristic:
t r
= ×
t td
( )
2
-
I 1
EQUATION1652 V1 EN-US
I = I /I
measured set
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
Range or value
0.10 ≤ 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
Phasor measurement unit RES670 2.2 ANSI
1MRK 511 408-UUS A
GUID-19F8E187-4ED0-48C3-92F6-0D9EAA2B39BB v3
Accuracy
ANSI/IEEE C37.112 ,
±5.0% or ±160 ms
whichever is greater
Technical manual