Identification - ABB RES670 Technical Manual

Section 8
Current protection
8.2
8.2.1
8.2.2
188
Function
Operate time, start non-directional at 0 to 10
x I
set
Reset time, start non-directional at 10 x I
0
Critical impulse time
Impulse margin time
Directional residual overcurrent protection, four steps
EF4PTOC (51N/67N)

Identification

Function description
Directional residual overcurrent
protection, four steps
Functionality
Directional residual overcurrent protection, four steps EF4PTOC (51N/67N) can be
used as main protection for phase-to-ground faults. It can also be used to provide a
system back-up, for example, in the case of the primary protection being out of service
due to communication or voltage transformer circuit failure.
EF4PTOC (51N/67N) has an inverse or definite time delay independent for each step.
All IEC and ANSI time-delayed characteristics are available together with an optional
user-defined characteristic.
EF4PTOC (51N/67N) can be set to be directional or non-directional independently for
each step.
IDir, VPol and IPol can be independently selected to be either zero sequence or
negative sequence.
A second harmonic blocking can be set individually for each step.
Setting range
Min. = 5 ms
Max. = 20 ms
to Min. = 20 ms
set
Max. = 35 ms
10 ms typically at 0 to 2 x I
15 ms typically
IEC 61850 IEC 60617
identification identification
EF4PTOC
4(IN>)
4
alt
4
TEF-REVA V2 EN-US
Phasor measurement unit RES670 2.2 ANSI
1MRK 511 408-UUS A
Accuracy
-
-
-
set
-
IP14509-1 v8
M14881-1 v6
ANSI/IEEE C37.2
device number
51N_67N
M13667-3 v19
Technical manual