NOTE
If the measured busbar voltage or tap voltage is too low, the manual compensation cannot be performed.
No manual compensation is carried out under the following conditions:
•
In the grounded system:
V
BB
< 10 % ⋅ V
BB,rated
or V
tap,sec
< 1 V
•
In the isolated system:
[fo_isolated-system, 2, en_US]
Resetting the Compensation
If one of the following conditions is met, the function works in the not compensated status:
•
Initial startup of the device before any compensation has been carried out
•
Activation of the binary input
>Reset comp. val.
•
Change of the parameter Cap.-bank neutral point in the Capacitor bank function group (refer to
chapter 5.4.3 Application and Setting Notes)
The not compensated status is indicated via the signal
Alg. not compensated
.
For the reliability of manual compensation, the binary input signal
>Reset comp. val.
has a preset soft-
ware filtering time (configurable in DIGIS) of 20 ms.
Functional Measured Values
Values
Description Primary Secondary % Referenced to
(_:15781:300) Vtap Tap voltage kV V Parameter Capacitor refer-
ence volt./√3
(_:15781:304)
Vunbal.
Neutral-point displacement
voltage
kV V Parameter Capacitor refer-
ence volt.
(_:15781:301)
Vdiff.
Differential voltage kV V Parameter Capacitor refer-
ence volt./√3
(_:15781:306)
Vdiff.cp
The compensated differential
voltage at the compensation
moment
kV V Parameter Capacitor refer-
ence volt./√3
(_:15781:305)
Mat.fac.
Voltage matching factor – – –
You can find the parameter Capacitor reference volt. in the General function block of the Capacitor
bank function group.
NOTE
If the function works in the not compensated status, the settings of the voltage matching factors are
displayed as functional measured values, and the functional measured values of Vdiff.cp are shown as
---.
Capacitor Bank Protection
7.7 Voltage Differential Protection for Capacitors
SIPROTEC 5, Overcurrent Protection, Manual 1037
C53000-G5040-C017-8, Edition 07.2017
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