Function Range or value Accuracy
Critical impulse time 10 ms typically at 0 to 2 x I
set
-
Operate time at 0 to 10 x I
set
Min. = 5 ms
Max. = 15 ms
-
Reset time at 10 x I
set
to 0 Min. = 25 ms
Max. = 35 ms
-
Critical impulse time 2 ms typically at 0 to 10 x I
set
-
Dynamic overreach
< 5% at t = 100 ms
-
6.4 Directional residual overcurrent protection, four
steps EF4PTOC
IP14509-1 v8
6.4.1 Identification
M14881-1 v6
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Directional residual overcurrent
protection, four steps
EF4PTOC
TEF-REVA V2 EN-US
51N_67N
6.4.2 Functionality
M13667-3 v19
EF4PTOC 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 can be set to be directional or non-directional independently for each
step.
IDir, UPol 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.
The residual current can be calculated by summing the three-phase currents or
taking the input from the neutral CT.
Section 6 1MRK 505 384-UEN A
Current protection
104 Breaker protection REQ650 2.2 IEC
Technical manual
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