Chapter 4 – Configuration
5 CURRENT CIRCUITS
Considering the input type configurations, it is possible to create current circuits with 1, 2, 3, or 4 elements.
For details about the each circuit type, see Chapter 14 Installation.
The phase sequences of the circuits supported by the equipment are ABC, BCA, CAB, CBA, BAC, and CBA
and may be customized by the user in the Equipment Setup, shown in Section 3.9. The default sequence is
ABC.
To add a new current circuit, select the CURRENT CIRCUITS section and fill in the following:
The IDENTIFIER text field allows user to enter a single code for the circuit being defined (maximum 12
characters). No editing allowed;
The WIRING scroll box allows selecting a number of elements used for measuring (1, 2, 3 or 4). No editing
allowed;
Selecting the 3-PHASE CIRCUIT SYNTHESIS check box, the 3-phase circuit synthesis is enabled. It is only
possible to select 3-phase circuit synthesis in a 1 element circuit (phase A, B, or C);
The INPUTS scroll box allows user to select the inputs to which each measuring element is connected. No
editing allowed;
The NOMINAL VALUE text field allows user to enter a circuit rated current;
The FREQUENCY REFERENCE scroll box allows user to select a reference voltage circuit;
The RATIO text fields allows user to enter ratio of power transformers for each input.
Once the circuit is created, it appears in the configuration interface menu. When selecting the circuit, a
screen shows the characteristics of the circuit selected, as shown in Figure 23. It is possible to edit some
parameters, such as nominal value, frequency reference, and transformation ratio.
The frequency is calculated individually for each circuit as long as the magnitude of the current is over 10%
of the nominal magnitude configured in the Current window of the chosen Voltage Circuit. The frequency
track occurs within the range of Nominal Frequency ±5Hz.
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