Identification - ABB Relion Technical Manual

1MRK 502 048-UUS A
Section 8
8.1
8.1.1
8.1.2
Technical manual
Current protection
Four step phase overcurrent protection 3-phase output
OC4PTOC (51/67)

Identification

Function description
Four step phase overcurrent protection
3-phase output
Functionality
The four step phase overcurrent protection function, 3-phase output OC4PTOC (51/67)
has independent inverse time delay settings for step 1 and 4. 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
IEC 61850 IEC 60617
identification identification
OC4PTOC
3I>
4
alt
4
TOC-REVA V1 EN
Section 8
Current protection
ANSI/IEEE C37.2
device number
51/67
193