Secondary setting value: 0.75 ⋅ 0.071 A = 0.053 A
NOTE
Use sensitive device current inputs in order to apply secondary thresholds of < 30 mA.
If no information is provided by the manufacturer of the capacitor bank, the following example can be used as
a basis in order to determine the value.
Example 2 (a to h): Unbalanced-Current Information Not Available from the Manufacturer of the Capacitor Bank,
External Capacitor-Bank Structure with Cross-Linked Cans
The following consideration applies to one phase.
2a) 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
- 2 parallel cans are always cross-linked, refer to the following diagram
[dwexaufbcb-120314-01, 1, en_US]
Figure 7-11
External Structure of the Capacitor Bank
Capacitor Bank Protection
7.4 Current-Unbalance Protection for Capacitors, 3-Phase
986 SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
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