Function
Range or value
Accuracy
Reset time at 10 to 0 x I
set
Min. = 25ms
Max. = 40 ms
-
Critical impulse time
2 ms typically at 0 to 10 x I
set
-
Dynamic overreach
< 5% at
t
= 100 ms
-
8.2
Four step phase overcurrent protection
OC4PTOC(51/67)
SEMOD129998-1 v7
8.2.1
Identification
M14885-1 v5
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-US
51_67
8.2.2
Functionality
M12846-3 v16
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.
Section 8
1MRK 502 066-UUS B
Current protection
450
Technical manual
Summary of Contents for Relion 670 series
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