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

Protection functions

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
Three-phase non-directional over-
current protection, low stage
Three-phase non-directional over-
current protection, high stage
Three-phase non-directional over-
current protection, instantaneous
stage
4.1.1.2 Function block
I_A
I_B
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.
214
FPHLPTOC
OPERATE I_A
START I_B
I_C
BLOCK
ENA_MULT
IEC 61850 IEC 60617
identification identification
(F)PHLPTOC 3I>
PHHPTOC 3I>>
PHIPTOC 3I>>>
PHHPTOC
OPERATE I_A
START I_B
I_C
BLOCK
ENA_MULT
1MRS758755 C
ANSI/IEEE C37.2
device number
51P-1
51P-2
50P/51P
PHIPTOC
OPERATE
START
REC615 & RER615
Technical Manual