Function Supervision
Automatic Operation
If the actual voltage exceeds or falls below the set bandwidth for longer than the set time delay, this situation
is shown by the indication
(_:14011:309) Auto Monitor
. If the actual voltage returns to the voltage
range, the indication is reset. You can switch off the function monitor with a time delay = 0 min.
[lofktueb-090913-01.vsd, 1, en_US]
Figure 6-128 Logic of the Function Supervision for Automatic Operation
Line Compensation
When using line compensation, the voltage drop of a phase that is connected to a transformer can be
included. In this case, 2 processes are available:
•
Z compensation (LDC-Z)
•
X and R compensation (LDC-XandR)
NOTE
Line compensation is only active if power is flowing in the direction of the line.
Z Compensation (LDC-Z)
Z compensation allows you to include the voltage drop of a line connected to the transformer. You can switch
Z compensation on or off. If cos φ is roughly constant, you can use Z compensation. Setting the parameters
requires the calculation of the voltage increase (Target voltage rising) taking into consideration the
load current (Max load current).
The parameter Target voltage rising represents the voltage drop across the line as a % under rated
load.
You can find more information and the calculation in chapter 6.9.4.1 General.
In case of active Z compensation, you must limit the maximum permitted voltage increase in relation to the
target voltage to avoid too high voltage at the transformer. To do this, set the parameter Max load
current. In addition, the parameter Vmax threshold is active. If the actual voltage exceeds this threshold
value, no more higher adjusting commands are issued.
6.9.3.4
6.9.3.5
Control Functions
6.9 Voltage Controller
462 SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017
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