Siemens 7SJ85 - Application and Setting Notes

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Figure 7-32
Inverse-Time Characteristic Curve
Phase-Segregated Operate Indications
In contrast to what normally occurs in a 3-phase protection device, the function generates phase-segregated
operate indications. These indications are needed for supervision applications.
Function Values
Values
Description Primary Secondary % Referenced to
(_:2311:301) VpeakA Peak voltage phase A kV V Parameter Capacitor
reference volt./√3
(_:2311:302) VpeakB Peak voltage phase B kV V Parameter Capacitor
reference volt./√3
(_:2311:303) VpeakC Peak voltage phase C kV V Parameter Capacitor
reference volt./√3
You can find the parameter Capacitor reference volt. of the preceding table in the function block
General of the function group Capacitor bank.
Application and Setting Notes
Parameter: Capacitor rated current
•
Default setting (_:2311:101) Capacitor rated current = 1000.0 A
With the Capacitor rated current parameter, you set the primary rated current I
C-rated
of the capacitor
or the capacitor bank.
Keep in mind that the rated current of the capacitor considers harmonics in addition to the fundamental
component.
7.6.3.2
Capacitor Bank Protection
7.6 Peak Overvoltage Protection for Capacitors
SIPROTEC 5, Overcurrent Protection, Manual 1023
C53000-G5040-C017-8, Edition 07.2017