Table 989: 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 990: Special conditions
Condition Description
U3P connected to real measurements The function can work with the correspond-
ing one voltage channel connected if the
measurement mode is set to "PhsAB",
"PhsBC", "PhsCA", "PhsA", "PhsB" or "PhsC".
The function requires that at least two (the
third voltage will be derived) or all three volt-
age channels are connected for the other
measurement modes.
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.
4.8.1.5 Operation principle
The function can be enabled and disabled with the
Operation
setting. The
corresponding parameter values are “On” and “Off”.
The operation of DUPPDPR can be described using a module diagram. All the
modules in the diagram are explained in the next sections.
OPERATE
START
Directional
calculation
Power
calculation
Level
detector
t
Timer
DISABLE
Blocking
logic
BLOCK
I3P
U3P
I_A
I_B
I_C
I
1
U_A_AB
U_B_BC
U_C_CA
U
1
Figure 590: Functional module diagram
Protection functions
1MRS759142 F
1056 REX640
Technical Manual
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