This function contains a blocking functionality. It is possible to block the function
outputs, reset timer or the function itself.
4.7.4.4 Analog channel configuration
UZPDIS has two analog group inputs which all must be properly configured.
Table 958: 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.
Table 959: Special conditions
Condition Description
U3P connected to real measurements The function can work with one voltage chan-
nel connected (
Phase Sel for Z Clc set
to "AB",
"BC" or "CA"), if the setting
Impedance Meas
mode is set to "1Phase-to-phase".
The function requires that at least two (the
third voltage will be derived) or all three
voltage channels are connected if
Impedance
Meas mode
is set to "3Phase-to-phase".
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.
4.7.4.5 Operation principle
The function can be enabled and disabled with the
Operation
setting. The
corresponding parameter values are "On" and "Off".
The operation of UZPDIS can be described with a module diagram. All the modules
in the diagram are explained in the next sections.
1MRS759142 F
Protection functions
REX640
Technical Manual
1027
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