Application and Setting Notes
Parameter: Matching-factor setting
•
Default setting (_:15781:102) Matching-factor setting = not phase-selective
With the parameter Matching-factor setting, you can select to set the voltage matching factor in a
phase-selective way or not.
Parameter Value Description
not phase-selective
Select this setting if you want to apply the same voltage matching factor for
all 3 phases.
phase-selective
Select this setting if you want to apply different voltage matching factors for
all 3 phases.
Parameter: Voltage matching factor, Volt. match. factor phs A, Volt. match. factor phs B,
Volt. match. factor phs C
•
Default setting (_:15781:101) Voltage matching factor = 2.0000
•
Default setting (_:15781:103) Volt. match. factor phs A = 2.0000
•
Default setting (_:15781:104) Volt. match. factor phs B = 2.0000
•
Default setting (_:15781:105) Volt. match. factor phs C = 2.0000
The voltage matching factors are applied as multipliers for the primary tap voltage to calculate the differential
voltage. It depends on the position of the tap-voltage measurement in the specific capacitor installation. The
setting is defined as the ratio of the capacitor-bank reference voltage to the tap voltage.
EXAMPLE
The application consists of:
•
Capacitor-bank busbar, with a rated voltage of 345 kV
•
Capacitor bank, consisting of 15 can levels in series
•
Capacitor-bank tap-voltage measurement between level 14 and 15
[lo_application example, 2, en_US]
Figure 7-42 Application Example for Setting the Voltage Matching Factor
Capacitor-bank busbar voltage as phase-to-phase voltage:
(it equals to a phase-to-ground voltage of 199.2 kV)
345 kV
7.7.3.2
Capacitor Bank Protection
7.7 Voltage Differential Protection for Capacitors
1038 SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
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