Earth-Fault Protection; Non-Directional Earth-Fault Protection Efxptoc; Identification; Function Block - ABB RELION 620 Series Technical Manual

1MRS757644 F
4.2
4.2.1
4.2.1.1
4.2.1.2
4.2.1.3
620 series
Technical Manual

Earth-fault protection

Non-directional earth-fault protection EFxPTOC

Identification

Function description
Non-directional earth-fault protection,
low stage
Non-directional earth-fault protection,
high stage
Non-directional earth-fault protection,
instantaneous stage

Function block

EFLPTOC
Io OPERATE
BLOCK
START
ENA_MULT
A070432 V2 EN
Figure 176: Function block

Functionality

The non-directional earth-fault protection function EFxPTOC is used as non-
directional earth-fault protection for feeders.
The function starts and operates when the residual current exceeds the set limit. The
operate time characteristic for low stage EFLPTOC and high stage EFHPTOC can be
selected to be either definite time (DT) or inverse definite minimum time (IDMT). The
instantaneous stage EFIPTOC always operates with the DT characteristic.
In the DT mode, the function operates after a predefined operate time and resets when
the fault current disappears. The IDMT mode provides current-dependent timer
characteristics.
The function contains a blocking functionality. It is possible to block function outputs,
timers or the function itself, if desired.
IEC 61850 IEC 60617
identification identification
EFLPTOC Io>
EFHPTOC Io>>
EFIPTOC Io>>>
EFHPTOC
Io OPERATE
BLOCK
START
ENA_MULT
Section 4
Protection functions
ANSI/IEEE C37.2
device number
51N-1
51N-2
50N/51N
EFIPTOC
Io OPERATE
BLOCK
START
ENA_MULT
361