6.2
Four step phase overcurrent protection 3-phase output
OC4PTOC (51/67)
6.2.1
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
6.2.2
Application
The Four step phase overcurrent protection 3-phase output OC4PTOC (51_67) 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 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.
If VT inputs are not available or not connected, setting parameter
DirModeSelx
(
x
= step 1, 2, 3 or 4) shall be left to default value
Non-
directional
or set to
Disabled
.
In many applications several steps with different current pick up levels and time delays are
needed. OC4PTOC (51_67) can have up to four different, individual settable, steps. The
flexibility of each step of OC4PTOC (51_67) is great. 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.
Choice of delay time characteristics: There are several types of delay time characteristics
available such as definite time delay and different types of inverse time delay
Section 6
1MRK 511 286-UUS A
Current protection
92
Application manual
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