The Bandcenter, Bandwidth, and Time Delay functions are set the same as if LDC were
not used.
LDC R/X
A classical approach can be used to determine the R/X settings for the LDC, however this
assumes a load center point and is usually not applicable to the typical distribution feeder.
For more information, contact ABB for Application Note #17.
A simpler method, which will work for most applications, is recommended. This involves
looking at the lines leaving the station and determining the resistance/reactance (R/X)
ratio for the main line. The resistive and reactive line drop compensation setpoints should
then be entered in this same R/X ratio.
If the CT and VT phasing corrections have been made to compensate for any phase angles
between measured voltage and load current, only positive values of R and X compensation
need to be used.
Table 63:
Approximate Ratio of Line Resistance to Reactance (R/X) of Typical Distribution Circuits
ACSR
COPPER
MCM
R/X
MCM
R/X
795
4.0
750
6.0
477
2.5
500
4.5
336
2.0
350
3.3
266
1.5
250
2.4
AVG
R/X
AVG
R/X
4/0
1.2
4/0
2.0
2/0
1.0
2/0
1.5
2
0.5
2
0.7
6
.02
6
0.3
By knowing the ratio of the maximum expected load to the present load, the amount of
voltage compensation needed is found as shown in the following example.
Desired
•
local voltage @ min load = 120 volts
•
local voltage @ max load = 124 volts
Using the following assumptions:
Section 7
1VAC388793-MB A
Setpoints
514
TCC300
User Manual
Summary of Contents for TCC300
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