ABB RELION REX640 Technical Manual page 345

1MRS759142 F
4.1.2.1 Identification
Function description
Three-phase directional overcurrent
protection, low stage
Three-phase directional overcurrent
protection, high stage
4.1.2.2 Function block
Figure 205: Function block
4.1.2.3 Functionality
The three-phase directional overcurrent protection function DPHxPDOC is used
as one-phase, two-phase or three-phase directional overcurrent and short-circuit
protection for feeders.
DPHxPDOC starts up when the value of the current exceeds the set limit and
directional criterion is fulfilled. The operate time characteristics for low stage
DPHLPDOC and high stage DPHHPDOC can be selected to be either definite time
(DT) or inverse definite minimum time (IDMT).
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.
4.1.2.4 Analog channel configuration
DPHxPDOC has two analog group inputs which must be properly configured.
Table 389: 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
DPHLPDOC 3I> ->
DPHHPDOC 3I>> ->
Description
Three-phase currents
Three-phase voltages
Protection functions
ANSI/IEEE C37.2
device number
67P/51P-1
67P/51P-2
345