ABB RED650 Technical Manual page 892

Section 25
Inverse time characteristics
886
Table 673: IEC Inverse time characteristics for Voltage restrained time overcurrent protection
Function
Operating characteristic:
æ ö
A
ç ÷
= ×
t k
( )
ç ÷
P
è - ø
I 1
EQUATION1251-SMALL V1 EN-US
I = I /I
measured set
IEC Normal Inverse
IEC Very inverse
IEC Inverse
IEC Extremely inverse
IEC Short time inverse
IEC Long time inverse
Table 674: Inverse time characteristics for overvoltage protection
Function
Type A curve:
k
=
t
æ ö
- >
U U
ç ÷
è ø
>
U
EQUATION1436-SMALL V1 EN-US
U> = U
set
U = U
measured
Type B curve:

k 480

t
2.0
 
 
U U
 
n
 
32 0.5

 U 
n
IECEQUATION2423 V2 EN-US
Type C curve:
×
k 480
=
t
3.0
- >
æ U U ö
n
× -
32 0.5
ç ÷
>
è U ø
IECEQUATION2421 V1 EN-US
Programmable curve:
×
k A
= +
t
P
æ ö
- >
U U
ç × - ÷
B C
è ø
>
U
EQUATION1439-SMALL V1 EN-US
Range or value
0.10 ≤ k ≤ 3.00
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
Range or value
k = (0.05-1.10) in
steps of 0.01
k = (0.05-1.10) in
steps of 0.01

0.035
k = (0.05-1.10) in
steps of 0.01
+
0.035
k = (0.05-1.10) in
steps of 0.01
A = (0.005-200.000)
in steps of 0.001
D
B = (0.50-100.00) in
steps of 0.01
C = (0.0-1.0) in steps
of 0.1
D = (0.000-60.000) in
steps of 0.001
P = (0.000-3.000) in
steps of 0.001
1MRK 505 394-UEN A
Accuracy
IEC 60255-151, ±5.0%
or ±40 ms whichever is
greater
Accuracy
±5.0% or ±45 ms
whichever is greater
Line differential protection RED650 2.2 IEC
Technical manual
SEMOD116978-2 v10