Three-Phase Voltage-Dependent Overcurrent Protection Phpvoc (Ansi 51V) - ABB RELION REX640 Technical Manual

1MRS759142 F
4.1.3 Three-phase voltage-dependent overcurrent protection
PHPVOC (ANSI 51V)
4.1.3.1 Identification
Function description
Three-phase voltage-dependent
overcurrent protection
4.1.3.2 Function block
Figure 220: Function block
4.1.3.3 Functionality
The three-phase voltage-dependent overcurrent protection function PHPVOC
is used for single-phase, two-phase or three-phase voltage-dependent time
overcurrent protection of generators against overcurrent and short circuit
conditions.
PHPVOC starts 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.
PHPVOC contains a blocking functionality. It is possible to block function outputs,
timers or the function itself.
4.1.3.4 Analog channel configuration
PHPVOC has two analog group inputs which all must be properly configured.
Table 414: Analog inputs
Input
I3P
U3P
There are a few special conditions which must be noted with the configuration.
REX640
Technical Manual
See the preprocessing function blocks in this document for the possible
signal sources.
IEC 61850 IEC 60617
identification identification
PHPVOC 3I(U)>
Description
Three-phase currents
Three-phase voltages
Protection functions
ANSI/IEEE C37.2
device number
51V
369