ABB COM600 series User's & Technical Manual page 18

18
COM600 series 5.1
Substation Analytics Technical Manual
Figure 4.3-9 Description of the equivalent load distance
The value of Equivalent load Dis can be calculated based on the load flow and voltage
drop calculations using equation:
Figure 4.3-10 (Equation 7)
U (real): the actual maximum voltage drop of the feeder
drop
U (s=1): the fictional voltage drop if the entire load is tapped at the end of the feeder,
drop
where s (proportional line length) equals unity. This value can be taken from anetwork
calculation program.
The Equivalent load Dis parameter can be determined by conducting a single-phase
earth-fault test (Rfault = 0 ohm) at that point of the feeder where the maximum actual
voltage drop takes place. This point is typically located at the end of the main line. The
calculated value of Equivalent load Dis can be obtained from the S_CALC output.
1MRS758734
description_of_the_equivalent_load_distance.png
equation_7.png