Function Block; Functionality; Analog Channel Configuration - ABB RELION REX640 Technical Manual

Section 4
Protection functions
4.1.2.2
4.1.2.3
4.1.2.4
326

Function block

GUID-5F0AABE8-DBDD-4CA1-8E7C-CA3B995EBAC8 V1 EN
Figure 182: Function block

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.

Analog channel configuration

DPHxPDOC has two analog group inputs which must be properly configured.
Table 364: Analog inputs
Input
I3P
U3P
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.
Table 365: Special conditions
Condition
U3P connected to real measurements
Description
Three-phase currents
Three-phase voltages
Description
The function can work with any two phase voltage
channels connected but it is recommended to
connect all three voltage channels.
1MRS759142 C
REX640
Technical Manual