the higher harmonics considerably better since they are transferred better by current transformers than by
voltage transformers.
The peak voltage determined is then set with reference to the rated voltage of the capacitor. The resulting
measurand is Û/V
C-rated
(t). The threshold value for the stage is thus set as a referenced quantity.
The phase-segregated peak overvoltages Û/V
C-rated
(t) are available as measured values for display or further
processing.
Pickup, Tripping and Dropout Behavior with the Definite-Time Characteristic Curve
If the measurand Û/V
C-rated
(t) exceeds the set threshold value, pickup occurs and the tripping delay starts. If the
measurand remains above the dropout value (95 % of the threshold value) during the tripping delay, the stage
trips.
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
For the detailed information of the function values, refer to Function Values, Page 1023.
Application and Setting Notes
Parameter: Capacitor rated current
•
Default setting (_:2311:101) Capacitor rated current = 1000.0 A
You can find the setting notes for the parameter Capacitor rated current under Parameter: Capac-
itor rated current, Page 1023.
Parameter: Threshold
•
Default setting (_:13831:3) Threshold = 1.10
The peak voltage determined is then set with reference to the rated voltage of the capacitor. The Threshold
is thus set as a referenced quantity.
The setting depends on the application of the stage. If this stage is intended to operate as a warning stage, a
very sensitive setting of approx. 1.05 can be selected. If the stage is used for instantaneous tripping in addi-
tion to the stage with inverse-time characteristic curve, Siemens recommends a setting of ≥ 3.00.
Parameter: Operate delay
•
Default setting (_:13831:6) Operate delay = 3.00 s
The setting depends on the application of the stage. If this stage is intended to operate as a warning stage, the
time delay can be selected in a range of seconds. If the stage is used for instantaneous tripping in addition to
the stage with inverse-time characteristic curve, the Operate delay can be set to 0.00 s.
Settings
Addr.
Parameter C Setting Options Default Setting
General
_:2311:101 General:Capacitor rated
current
1.0 A to 100000.0 A 1000.0 A
Definite-T 1
_:13831:1 Definite-T 1:Mode
•
off
•
on
•
test
off
7.6.4.2
7.6.4.3
Capacitor Bank Protection
7.6 Peak Overvoltage Protection for Capacitors
1028 SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
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