Table 258: 67/51P Technical revision history
Technical revision Change
B Added a new input NON_DIR
C Step value changed from 0.05 to 0.01 for the
Time
multiplier
setting.
D Monitored data VMEM_USED indicating voltage
memory use.
E Internal improvement.
4.1.3 Three-phase voltage-dependent overcurrent protection 51V
4.1.3.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Three-phase voltage-dependent
overcurrent protection
PHPVOC 3I(U)> 51V
4.1.3.2 Function block
TRIP
PICKUPI_B
51V
I_C
V_BC
V_AB
V_CA
I_A
BLOCK
ENA_MULT
ENA_U_MULT
GUID-6290E1B0-0380-40DD-A5AF-60D789C30DF2 V1 EN
Figure 126: Function block
4.1.3.3 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.
Section 4 1MAC059074-MB A
Protection functions
258 615 series ANSI
Technical Manual
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