Uk Rectifier Inverse-Time Characteristic - ABB RELION REX640 Technical Manual

1MRS759142 C
11.2.1.4
REX640
Technical Manual

UK rectifier inverse-time characteristic

The UK rectifier type simulates the rectifier bridge.
The operate times are defined with the coefficients A, B and C.
The values of the coefficients can be calculated according to the formula
 
 
A
t s [ ] =  B k 
+ ⋅
c
I
 
 
1
 −
 

I
>
 
 
GUID-B27F8BAE-0F5F-4151-922C-D08B6261B1D7 V1 EN
t[s] Operate time in seconds
I Measured current
Start value
I> Set
Time multiplier
k Set
Table 1473: Curve parameters for UK rectifier
Operating curve type A
(20) UK rectifier 45900
General function block features
B
0
Section 11
(Equation 358)
C
5.6
1679