Example 3 (a to d): Unbalanced-Current Information Not Available from the Manufacturer of the Capacitor Bank,
External Capacitor-Bank Structure without Cross-Linked Cans
Example 3 is almost identical to example 2. The only difference is that the cans are not cross-linked. Here, only
the calculation part is discussed that is a result of the different external structure. Information for additional
calculations can be found in example 2.
3a) External Structure of the Capacitor Bank
The external structure of the capacitor bank must be known or must be determined. This information can be
requested from the manufacturer of the capacitor bank.
This example assumes the following external structure of the capacitor bank:
- 28 levels (cans) in series
- 4 cans per level
- H transformer between levels 13 and 14, counting from top to bottom
- Parallel cans are not cross-linked, refer to the following diagram
[dwexafbocb-260314-01, 1, en_US]
Figure 7-14
External Structure of the Capacitor Bank
3b) Capacitance in the Quarter of the H Connection during an Element Fault
The current transformer is not located in the center of the levels; therefore, the following calculation for the
upper (C1) and the lower quarter (C3) must be performed.
Capacitor Bank Protection
7.4 Current-Unbalance Protection for Capacitors, 3-Phase
990 SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
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