ABB RELION REX640 Technical Manual page 1107

1MRS759142 C
REX640
Technical Manual
In case of evenly distributed load, Equivalent load Dis ~ 0.5. When the load is tapped
at the end of the feeder, Equivalent load Dis = 1.0. If the load distribution is unknown,
a default value of 0.5 can be used for Equivalent load Dis.
The maximum value of the voltage drop, denoted as U
the feeder. The Equivalent load Dis setting is the distance at which a single load tap
corresponding to the total load of the feeder results in a voltage drop equal to
U (real). The dashed curve shows the voltage drop profile in this case.
drop
GUID-8A86C6C0-AE40-46E2-9D3D-BB41F24EA85C V1 EN
Figure 597: Description of the equivalent load distance
The exact value for Equivalent load Dis can be calculated based on the load flow and
voltage drop calculations using data from the DMS system and the following
equation.
U
Equivalent load Dis
=
U
GUID-E0133B0B-6C09-4766-8D68-0E5C257DEE55 V2 EN
U Actual maximum voltage drop of the feeder
d(real)
U Fictional voltage drop if the entire load were tapped at the end (d=1) of the feeder
d(tap,d=1)
(not drawn in
system.
Protection related functions
drop real
( )
drop tap d ( , ) 1
=
Figure 597). The calculation of this value requires data from the DMS
Section 5
(real), appears at the end of
drop
(Equation 263)
1101