Operation Principle - ABB RELION REX640 Technical Manual

Section 10
Power quality measurement functions
10.3.5
1624
There are a few special conditions which must be noted with the configuration.
Table 1453: Special conditions
Condition
U3P connected real measurements
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 PHQVVR can be described with a module diagram. All the modules
in the diagram are explained in the next sections.
U_A
U_B
U3P
U_C
I_A
I_B
I3P
I_C
BLOCK
Duration
measurement
GUID-C6FDA0C2-794B-4FC4-B48B-FCDFD30116B2 V1 EN
Figure 836: Functional module diagram
Description
The function can work with one voltage channel
connected (A, B or C depending on the
supervision setting "Ph A", "Ph B" or "Ph C") if
Phase mode is set to "Single Phase".
The function can work with two voltage channel
connected (A-B, B-C or C-A depending on the
Phase supervision setting "Ph A+B", "Ph B+C" or
"Ph A+C") if
The function requires that all three voltage
channels are connected if
to "Ph A+B+C" and
"Three Phase".
OPERATE
START
Variation
SWELLST
detection
DIPST
INTST
Variation
Recorded
validation
data
1MRS759142 C
Phase
Phase mode is set to "Three Phase".
Phase supervision is set
Phase mode setting is set to
REX640
Technical Manual