Three-Phase Voltage-Dependent Overcurrent Protection 51V; Identification; Function Block; Functionality - ABB 615 series Technical Manual

Section 4
Protection functions
4.1.3
4.1.3.1
4.1.3.2
4.1.3.3
258
Table 258: 67/51P Technical revision history
Technical revision
B
C
D
E

Three-phase voltage-dependent overcurrent protection 51V

Identification

Function description
Three-phase voltage-dependent
overcurrent protection

Function block

51V
I_A
TRIP
I_B PICKUP
I_C
V_AB
V_BC
V_CA
BLOCK
ENA_MULT
ENA_U_MULT
GUID-6290E1B0-0380-40DD-A5AF-60D789C30DF2 V1 EN
Figure 126: Function block

Functionality

The three-phase voltage-dependent overcurrent protection function 51V is used for
single-phase, two-phase or three-phase voltage-dependent time overcurrent protection of
generators against overcurrent and short circuit conditions.
The function picks up when the input phase current exceeds a limit which is dynamically
calculated based on the measured terminal voltages. The operating characteristics can be
selected to be either inverse definite minimum time IDMT or definite time DT.
Change
Added a new input NON_DIR
Step value changed from 0.05 to 0.01 for the
multiplier setting.
Monitored data VMEM_USED indicating voltage
memory use.
Internal improvement.
IEC 61850 IEC 60617
identification identification
PHPVOC 3I(U)>
1MAC059074-MB A
Time
ANSI/IEEE C37.2
device number
51V
615 series ANSI
Technical Manual