ABB RELION REX640 - 4.1.2.2 Function block; 4.1.2.3 Functionality; 4.1.2.4 Analog channel configuration

4.1.2.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Three-phase directional overcurrent
protection, low stage
DPHLPDOC 3I> -> 67P/51P-1
Three-phase directional overcurrent
protection, high stage
DPHHPDOC 3I>> -> 67P/51P-2
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 Description
I3P Three-phase currents
U3P Three-phase voltages
See the preprocessing function blocks in this document for the possible
signal sources.
There are a few special conditions which must be noted with the configuration.
1MRS759142 F
Protection functions
REX640
Technical Manual
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