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Function-Group Types
5.4 Function-Group Type Capacitor Bank
You can find more detailed information in Chapter 2.
The Capacitor bank function group has the following 6 interfaces with the measuring points. The universal
standard functions only work with the standard interfaces 3-phase current and/or 3-phase voltage;
the other 4 interfaces are provided for the functions which are exclusively used for the capacitor banks. Please
also refer to the example given below.
The Capacitor bank function group has the following interfaces with the measuring points:
•
3-phase current:
The measurands from the 3-phase current system are supplied via this interface. Depending on the
connection type of the current transformers, the measurands can be for example I
values that can be calculated from the measurands are also provided via this interface.
The Capacitor bank function group must always be connected to the 3-phase current measuring point.
You can connect the 3-phase current measuring point interface to the maximum of two 3-phase
current measuring points. If 2 current measuring points have been connected to the 3-phase current
interface, the total current is determined by adding the measured values from both measuring points in
the function group. The functions in the Capacitor bank function group evaluate the total current.
•
3-phase voltage (optional):
The measurands from the 3-phase voltage system are supplied via this interface. Depending on the
connection type of the voltage transformers, these can be for example V
that can be calculated from the measurands are also provided via this interface.
The connection of the 3-phase voltage interface is optional. This connection is only required if protec-
tion functions or supervision functions are applied, which require voltage measurements.
•
3-phase voltage CB tap (optional):
The measurands of a 3-phase tap voltage within a capacitor bank are supplied via this interface.
The connection of the 3-phase voltage CB tap interface is optional. You can connect the 3-phase voltage
CB tap interface to a maximum of one 3-phase voltage measuring point.
•
Voltage unbalance (optional):
The unbalanced-voltage measurands (for example, an isolated neutral point of the capacitor bank) are
supplied via this interface.
The connection of the voltage unbalance interface is optional. You can connect the voltage unbalance
interface to a maximum of one 1-phase voltage measuring points.
•
Current unbalance (optional):
The unbalanced-current measurands are supplied via this interface.
The connection of the current unbalance interface is optional. You can connect the current unbalance
interface to a maximum of two 3-phase current measuring points and six 1-phase current measuring
points.The interface allows mixed connections to 3-phase current measuring point and 1-phase current
measuring point; however the sum of the connections is no more than 6.
For an overview which function are applicable on this interface, please refer to Figure 1-5.
•
3-phase current RLC (optional)
The measurands from a tuning or filtering section (R, L, or C) of a capacitor bank are supplied via this
interface.
The connection of the 3-phase current RLC interface is optional. You can connect the 3-phase current
RLC interface to a maximum of nine 3-phase current measuring points.
For an overview which function are applicable on this interface, please refer to
Example
The following figure shows an example of a capacitor in H-configuration and tuning section. In the single line,
the primary current and voltage measurement are shown. The required device measuring points and their
connections to the function group interfaces are shown as well. In addition, it is indicated which protection
function receives its measuring value from which measuring point.
214
, I
, I
, I
, or 3I
A
B
C
N
, V
, V
, V
, or 3V
. All values
A
B
C
N
0
Figure
5-15.
SIPROTEC 5, Overcurrent Protection, Manual
C53000-G5040-C017-8, Edition 07.2017
. All
0
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