With the setting of the parameter Max load current, you can prevent the voltage at the transformer from
becoming too high in the event of extraordinarily high load current. If the load current exceeds the set value,
no additional load-current compensation is calculated.
For setting the parameter Line drop compensation = LDC-XandR, consider the following parameter:
Parameter: R line
•
Default setting (_:14011:153) R line = 0.0 Ω
With the R line parameter, you to set the ohmic resistance of the line.
Parameter: X line
•
Default setting (_:14011:154) X line = 0.0 Ω
With the X line parameter, you set the reactance for the line to be protected.
In order to determine the voltage drop by the line, entering the parameter R line and X line is necessary
for the procedure Line drop compensation = LDC-XandR. If the primary values are known and you
would like to set the secondary values, use the following formula for the calculation
[fo-I-V-Ratio-250214, 1, en_US]
As an example, calculate X
sec
with the following parameters:
Current transformer ratio : 1000 A/1 A
Voltage transformer ratio : 380 kV/0.1 kV
X
prim
: 21 Ω
:
Therefore, the result for X
sec
is:
Line Compensation for the Three-Winding Transformer and Grid Coupling Transformer
Parameter: Line drop compensation
•
Default setting (_:125) Line drop compensation = off
For setting the parameter Line drop compensation = LDC-Z, consider the following parameter:
Parameter: Target voltage rising w1
•
Default setting (_:126) Target voltage rising w1 = 4.0%
Parameter: Target voltage rising w2
•
Default setting (_:147) Target voltage rising w2 = 4.0%
Parameter: Max load current
•
Default setting (_:127) Max load current = 100.0 %
For setting the parameter Line drop compensation = LDC-XandR, consider the following parameter:
Parameter: R line w1
•
Default setting (_:153) R line w1 = 0.0 Ω
Parameter: R line w2
•
Default setting (_:155) R line w2 = 0.0 Ω
Parameter: X line w1
•
Default setting (_:154) X line w1 = 0.0 Ω
Parameter: X line w2
•
Default setting (_:156) X line w2 = 0.0 Ω
Control Functions
8.9 Voltage Controller
1220 SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
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