ABB RED650 - Page 892

Table 673: IEC Inverse time characteristics for Voltage restrained time overcurrent protection
Function Range or value Accuracy
Operating characteristic:
( )
1
= ×
-
æ ö
ç ÷
ç ÷
è ø
P
A
t k
I
EQUATION1251-SMALL V1 EN-US
I = I
measured
/I
set
0.10 ≤ k ≤ 3.00 IEC 60255-151, ±5.0%
or ±40 ms whichever is
greater
IEC Normal Inverse A=0.14, P=0.02
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
SEMOD116978-2 v10
Table 674: Inverse time characteristics for overvoltage protection
Function Range or value Accuracy
Type A curve:
=
- >
>
æ ö
ç ÷
è ø
t
k
U U
U
EQUATION1436-SMALL V1 EN-US
U> = U
set
U = U
measured
k = (0.05-1.10) in
steps of 0.01
±5.0% or ±45 ms
whichever is greater
Type B curve:
2.0
480
0.035
32 0.5
n
n
k
t
UU
U








IECEQUATION2423 V2 EN-US
k = (0.05-1.10) in
steps of 0.01
Type C curve:
3.0
480
0.035
32 0.5
n
k
t
U U
U
×
= +
- >
æ ö
× -
ç ÷
>
è ø
IECEQUATION2421 V1 EN-US
k = (0.05-1.10) in
steps of 0.01
Programmable curve:
×
= +
- >
× -
>
æ ö
ç ÷
è ø
P
k A
t D
U U
B C
U
EQUATION1439-SMALL V1 EN-US
k = (0.05-1.10) in
steps of 0.01
A = (0.005-200.000)
in steps of 0.001
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
Section 25 1MRK 505 394-UEN A
Inverse time characteristics
886 Line differential protection RED650 2.2 IEC
Technical manual