ABB REB670 - Inverse Characteristic; ANSI Inverse Time Characteristics

Inverse characteristic
Table 63. ANSI Inverse time characteristics
Function Range or value Accuracy
Operating characteristic:
( )
1
= + ×
-
æ ö
ç ÷
ç ÷
è ø
P
A
t B k
I
EQUATION1249-SMALL V1 EN
Reset characteristic:
( )
2
1
= ×
-
t
r
t k
I
EQUATION1250-SMALL V1 EN
I = I
measured
/I
set
k = (0.05-999) in steps of 0.01 -
ANSI Extremely Inverse A=28.2, B=0.1217, P=2.0 , tr=29.1 ANSI/IEEE C37.112, 5%
+ 40 ms
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
Busbar protection REB670
1MRK505212-BEN E
Pre-configured
Product version: 1.2
52 ABB