Section 7 Current protection
7.1 Directional phase overcurrent protection, four steps
OC4PTOC
SEMOD129998-1 v8
7.1.1 Identification
M14885-1 v6
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Directional phase overcurrent
protection, four steps
OC4PTOC
TOC-REVA V2 EN-US
51_67
7.1.2 Application
M15335-3 v9
Directional phase overcurrent protection, four steps OC4PTOC is used in several
applications in the power system. Some applications are:
• Short circuit protection of feeders in distribution and subtransmission systems.
Normally these feeders have a radial structure.
• Back-up short circuit protection of transmission lines.
• Back-up short circuit protection of power transformers.
• Short circuit protection of different kinds of equipment connected to the power
system such as; shunt capacitor banks, shunt reactors, motors and others.
• Back-up short circuit protection of power generators.
In many applications several steps with different current pickup levels and time
delays are needed. OC4PTOC can have up to four different, individually settable
steps. The following options are possible:
Non-directional / Directional function: In most applications the non-directional
functionality is used. This is mostly the case when no fault current can be fed from
the protected object itself. In order to achieve both selectivity and fast fault
clearance, the directional function can be necessary.
If VT inputs are not available or not connected, the setting
parameter DirModex (x = step 1, 2, 3 or 4) shall be left to the
default value Non-directional.
1MRK 505 388-UEN B Section 7
Current protection
Busbar protection REB650 2.2 IEC 91
Application manual
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