ABB REG670 Technical Manual page 1262

Section 25
Inverse time characteristics
1256
Table 963: IEC Inverse time characteristics for Line Differential protection
Function
Operating characteristic:
æ ö
A
ç ÷
= ×
t k
( )
ç ÷
P
è - ø
I 1
EQUATION1251-SMALL V1 EN
I = I /I
measured set
IEC Normal Inverse
IEC Very inverse
IEC Inverse
IEC Extremely inverse
IEC Short time inverse
IEC Long time inverse
Programmable characteristic
Operate characteristic:
æ ö
A
ç ÷
= + ×
t B k
( )
ç ÷
P
è - ø
I C
EQUATION1370-SMALL V1 EN
Reset characteristic:
TR
= ×
t k
( )
PR
-
I CR
EQUATION1253-SMALL V1 EN
I = I /I
measured set
The parameter setting Characterist1 and 4/Reserved shall not be used,
since this parameter setting is for future use and not implemented yet.
Range or value
k = (0.05-2.00) in steps of 0.01
A=0.14, P=0.02
A=13.5, P=1.0
A=0.14, P=0.02
A=80.0, P=2.0
A=0.05, P=0.04
A=120, P=1.0
k = (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
1MRK502052-UEN B
Accuracy
IEC 60255-151, ± 5.0%
or ± 40 ms whichever is
greater
Technical manual