ABB Relion 670 series, Technical Reference Manual

Page: 1195 / 1232

Table 729: IEC Inverse time characteristics
Function Range or value Accuracy
Operating characteristic:
( )
= ×
-
æ ö
ç ÷
ç ÷
è ø
1
P
A
t td
I
EQUATION1653 V1 EN
I = I
measured
/I
set
td = (0.05-999) in steps of 0.01 -
Time delay to reset, IEC inverse time (0.000-60.000) s ± 0.5% of set time ± 10
ms
IEC Normal Inverse A=0.14, P=0.02 IEC 60255-151, 5% + 40
ms
IEC Very inverse A=13.5, P=1.0
IEC Inverse A=0.14, P=0.02
IEC Extremely inverse A=80.0, P=2.0
IEC Short time inverse A=0.05, P=0.04
IEC Long time inverse A=120, P=1.0
Programmable characteristic
Operate characteristic:
( )
= + ×
-
æ ö
ç ÷
ç ÷
è ø
P
A
t B td
I C
EQUATION1654 V1 EN
Reset characteristic:
( )
= ×
-
PR
TR
t td
I CR
EQUATION1655 V1 EN
I = I
measured
/I
set
td = (0.05-999) in steps of 0.01
A=(0.005-200.000) in steps of
0.001
B=(0.00-20.00) in steps of 0.01
C=(0.1-10.0) in steps of 0.1
P=(0.005-3.000) in steps of 0.001
TR=(0.005-100.000) in steps of
0.001
CR=(0.1-10.0) in steps of 0.1
PR=(0.005-3.000) in steps of
0.001
1MRK505222-UUS C
Section 22
Inverse time characteristics
1189
Technical reference manual