ABB RELION REX640 Technical Manual page 681

1MRS759142 F
The instantaneous high stage provides a very fast clearance of severe faults with a
high differential current regardless of their harmonics.
The setting characteristic can be set more sensitive with the aid of tap changer
position compensation. The correction of transformation ratio due to the changes
in tap position is done automatically based on the tap changer status information.
4.3.2.4 Analog channel configuration
TR2PTDF has two analog group inputs which must be properly configured.
Table 654: Analog inputs
Input
I3P1
I3P2
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.
4.3.2.5 Operation principle
The function can be enabled and disabled with the
corresponding parameter values are "On" and "Off".
The operation of TR2PTDF can be described by using a module diagram. All the
modules in the diagram are explained in the next sections.
REX640
Technical Manual
See the preprocessing function blocks in this document for the possible
signal sources.
Protection functions
Description
Three-phase currents
Three-phase currents
Operation setting. The
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