ABB Relion 670 series - Page 1196

Table 730: RI and RD type inverse time characteristics
Function Range or value Accuracy
RI type inverse characteristic
= ×
-
1
0.236
0.339
t td
I
EQUATION1656 V1 EN
I = I
measured
/I
set
td = (0.05-999) in steps of 0.01 IEC 60255-151, 5% + 40
ms
RD type logarithmic inverse characteristic
= - ×
æ ö
ç ÷
è ø
5.8 1.35t
I
In
td
EQUATION1657 V1 EN
I = I
measured
/I
set
td = (0.05-999) in steps of 0.01
Section 22 1MRK505222-UUS C
Inverse time characteristics
1190
Technical reference manual