ABB RELION 650 Series Product Manual page 64

Transformer protection RET650 2.1 IEC
Table 98. RI and RD type inverse time characteristics
Function
RI type inverse characteristic
1
= ×
t k
0.236
-
0.339
I
EQUATION1137-SMALL V1 EN-US
I = I /I
measured set
RD type logarithmic inverse
characteristic
æ ö
I
- ç × ÷
= 5.8 1.35 In
t
è ø
k
EQUATION1138-SMALL V1 EN-US
I = I /I
measured set
Table 99. 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 ÷
>
U
è ø
IECEQUATION2421 V1 EN-US
Programmable curve:
×
k A
= +
t D
P
æ ö
- >
U U
ç × - ÷
B C
è ø
>
U
EQUATION1439-SMALL V1 EN-US
64
Range or value
0.05 ≤ k ≤ 999.00
1.5 x I ≤ I ≤ 20 x I
set
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
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
set
SEMOD116978-2 v10
1MRK 504 161-BEN C
Accuracy
IEC 60255-151, ±2.0%
or ±40 ms whichever is
greater
Accuracy
±5.0% or ±45 ms
whichever is greater
ABB