Three-Phase Directional Overcurrent Protection 67/51P And 67/50P164; Identification; Function Block; Functionality - ABB RELION 620 Series Technical Manual

Section 4
Protection functions
4.1.3
4.1.3.1
4.1.3.2
4.1.3.3
4.1.3.4
164
Three-phase directional overcurrent protection 67/51P and
67/50P

Identification

Function description
Three-phase directional overcurrent
protection, low stage
Three-phase directional overcurrent
protection, high stage

Function block

67/51P
I_A TRIP
I_B PICKUP
I_C
I
2
V_A_AB
V_B_BC
V_C_CA
V
1
V
2
BLOCK
ENA_MULT
GUID-F10FF7BD-580A-499B-B057-93BCC8A30B85-ANSI V1 EN
Figure 70: Function block

Functionality

The three-phase overcurrent protection 67/51P and 67/50P is used as one-phase, two-
phase or three-phase directional overcurrent and short-circuit protection.
67/51P and 67/50P pick up when the value of the current exceeds the set limit and
directional criterion is fulfilled. The trip time characteristics for low stage 67/51P and high
stages 67/50P-1 and 67/50P-2 can be selected to be either definite time (DT) or inverse
definite minimum time (IDMT).
In the DT mode, the function trips after a predefined trip 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.

Operation principle

The function can be enabled and disabled with the Operation setting. The corresponding
parameter values are "Enable" and "Disable".
IEC 61850 IEC 60617
identification identification
DPHLPDOC 3I> ->
DPHHPDOC 3I>> ->
3I>> ->
67/50P-1
I_A TRIP
I_B PICKUP
I_C
I
2
V_A_AB
V_B_BC
V_C_CA
V
1
V
2
BLOCK
ENA_MULT
1MAC504801-IB E
ANSI/IEEE C37.2
device number
67/51P
67/50P-1
67/50P-2
67/50P-2
I_A TRIP
I_B PICKUP
I_C
I
2
V_A_AB
V_B_BC
V_C_CA
V
1
V
2
BLOCK
ENA_MULT
620 series ANSI
Technical Manual