Logic for Calculation and Compensation
[Lo_voltdiffgeneral_20140714.vsd, 3, en_US]
Figure 7-37
Logic Diagram of the General Functionality
Measurands, Method of Measurement
The function receives the 3-phase busbar and tap voltage measurands (see also V
BB
and V
tap
in Figure 7-37) via
the 3-phase voltage and 3-phase voltage CB tap interfaces of the Capacitor bank function group. For an
isolated capacitor-bank system, the function receives the capacitor-bank neutral-point displacement voltage
V
N
via the Voltage unbalance interface. The method of measurement used processes the sampled voltage
values and filters out the fundamental component numerically.
The compensated or not compensated differential voltage is provided to the protection stage for evaluation.
Voltage Matching Factor, Setting of the Matching Factor
The voltage matching factor k is used as a multiplier for the tap voltage to obtain an equivalent voltage value
compared to the busbar voltage. With the parameter Matching-factor setting, you can select to set the
Capacitor Bank Protection
7.7 Voltage Differential Protection for Capacitors
SIPROTEC 5, Overcurrent Protection, Manual 1033
C53000-G5040-C017-8, Edition 07.2017
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