ABB Relion 670 Series RES670, Technical Manual

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Section 8 Current protection
8.1 Four step phase overcurrent protection
OC4PTOC(51/67)
8.1.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Four step phase overcurrent protection
3-phase output
OC4PTOC
TOC-REVA V2 EN
51_67
8.1.2 Functionality
The four step three-phase overcurrent protection function OC4PTOC (51/67) has
independent inverse time delay settings for steps 1 to 4.
All IEC and ANSI inverse time characteristics are available together with an optional user
defined time characteristic.
The directional function needs voltage as it is voltage polarized with memory. The
function can be set to be directional or non-directional independently for each of the steps.
A second harmonic blocking level can be set for the function and can be used to block each
step individually.
1MRK 511 365-UUS A
Section 8
Current protection
Phasor measurement unit RES670 2.1 ANSI 169
Technical manual