ABB Relion 650 Series Product Manual page 101

Transformer protection RET650
Version 2.2
Table 151. 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 ö
U U
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
Hitachi Power Grids
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
D
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
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SEMOD116978-2 v11
1MRK 504 172-BEN G
Accuracy
±5% +60 ms
101