Section 7 Current protection
7.1 Four step phase overcurrent protection 3-phase
output OC4PTOC (51/67)
7.1.1 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 V1 EN
51/67
7.1.2 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.
A 2nd harmonic blocking can be set individually for each step.
1MRK 505 277-UUS C Section 7
Current protection
73
Technical Manual
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