Ansi Inverse Time Characteristics - ABB RED670 Product Manual

Line differential protection RED670 2.1 IEC
Product version: 2.1
Inverse characteristic
Table 171. ANSI Inverse time characteristics
Function
Operating characteristic:
æ ö
A
ç ÷
= + × +
t B k tDef
( )
ç ÷
P
ç - ÷
I 1
è ø
EQUATION1249-SMALL V2 EN
Reset characteristic:
t r
= ×
t k
( )
2
-
I 1
EQUATION1250-SMALL V1 EN
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
ABB
Range or value
0.10 ≤ k ≤ 3.00
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 505 346-BEN -
Accuracy
ANSI/IEEE C37.112 ,
±2.0% or ±40 ms
whichever is greater
111