Analog Channel Configuration; Operation Principle - ABB RELION REX640 Technical Manual

Section 4
Protection functions
4.3.6.4
4.3.6.5
688
However, the function can also be used for providing generator, motor, transformer
and reactor protection.
The function starts and operates when the differential current exceeds the set limit.
The operate time characteristics are according to definite time (DT).
The function contains a blocking functionality. It is possible to block the function
outputs, timer or the whole function.

Analog channel configuration

HIxPDIF has one analog group input which must be properly configured.
Table 622: Analog inputs
Input
I3P
See the preprocessing function blocks in this document for the
possible signal sources.
Improper analog channel configuration causes a validation error if the analog
channels are not completely configured or they do not match with certain settings. For
troubleshooting, check the contents of this chapter and also the preprocessing blocks
in this document. The configuration can be written to the protection relay once the
mismatch is corrected.

Operation principle

The function can be enabled and disabled with the Operation setting. The
corresponding parameter values are "on" and "off".
The operation of HIxPDIF can be described with a module diagram. All the modules
in the diagram are explained in the next sections.
Description
Three-phase currents
1MRS759142 C
REX640
Technical Manual