ABB Relion REC615 - Protection Functions; Three-Phase Current Protection; Three-Phase Non-Directional Overcurrent Protection (F)Phxptoc

4 Protection functions
4.1 Three-phase current protection
4.1.1 Three-phase non-directional overcurrent protection
(F)PHxPTOC
4.1.1.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Three-phase non-directional over-
current protection, low stage
(F)PHLPTOC 3I> 51P-1
Three-phase non-directional over-
current protection, high stage
PHHPTOC 3I>> 51P-2
Three-phase non-directional over-
current protection, instantaneous
stage
PHIPTOC 3I>>> 50P/51P
4.1.1.2 Function block
PHHPTOC
I_A
I_B
START
OPERATE
I_C
BLOCK
ENA_MULT
FPHLPTOC
I_A
I_B
START
OPERATE
I_C
BLOCK
ENA_MULT
PHIPTOC
I_A
I_B
START
OPERATE
I_C
BLOCK
ENA_MULT
Figure 112: Function block
4.1.1.3 Functionality
The three-phase non-directional overcurrent protection function (F)PHxPTOC is
used as one-phase, two-phase or three-phase non-directional overcurrent and
short-circuit protection.
The function starts when the current exceeds the set limit. The operate time
characteristics for low stage (F)PHLPTOC and high stage PHHPTOC can be selected
to be either definite time ( DT) or inverse definite minimum time ( IDMT). The
instantaneous stage PHIPTOC always operates with the DT characteristic.
Protection functions
1MRS758755 C
214 REC615 & RER615
Technical Manual