ABB ret650, Technical Manual

Page: 149 / 670

Function Range or value Accuracy
Reset time 30 ms typically at 2 to 0 x I
set
-
Critical impulse time 10 ms typically at 0 to 2 x I
set
-
Operate time 10 ms typically at 0 to 5 x I
set
-
Reset time 40 ms typically at 5 to 0 x I
set
-
Critical impulse time 2 ms typically at 0 to 5 x I
set
-
Dynamic overreach
< 5% at t = 100 ms
-
8.2 Four step phase overcurrent protection 3-phase
output OC4PTOC
8.2.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Four step phase overcurrent protection
3-phase output
OC4PTOC
4
4
alt
3I>
TOC-REVA V1 EN
51/67
8.2.2 Functionality
The four step phase overcurrent protection function, 3-phase output OC4PTOC has an
inverse or definite time delay independent for step 1 and 4 separately. Step 2 and 3 are
always definite time delayed.
All IEC and ANSI inverse time characteristics are available.
The directional function is voltage polarized with memory. The function can be set to
be directional or non-directional independently for each of the steps.
Second harmonic blocking level can be set for the function and can be used to block
each step individually
1MRK 504 135-UEN A
Section 8
Current protection
143
Technical manual