Calculation of symmetrical components for oscillogram signals

For the program for viewing oscillograms in the COMTRADE format a functional for calculating the symmetric components for signals is added.

A new button has been added to the toolbar, when clicked, the waveform is hidden, and the form for selecting analog signals for calculating the symmetrical components is displayed on the screen (Fig. 1). The remaining buttons, except for the graph scaling buttons, become inactive. When the button is pressed again, the screen for calculating the symmetrical components is hidden, and the waveform is displayed in the form in which it was before the button was pressed.

Fig. 1. The program interface for calculating symmetrical components

For the calculation, it is necessary to select the signals from the list generated automatically by the program from the CFG file, and also indicate the necessary calculated symmetrical components. Modules and phases are available for calculation in the positive, negative and zero sequences, as well as instantaneous values of the zero sequence value. To display the calculated signals of the symmetrical components on the screen, you must click the “Display” button.

After pressing the button, the initial waveform will be displayed on the screen, in which the calculated signals of the symmetrical components will be added to the end (Fig. 2). For oscillograms with information on primary and secondary values, the display of the calculated signals of the symmetric components in primary and secondary values is available.

Fig. 2. The calculated signals of the symmetrical components

More detailed instructions for using the oscillogram viewer can be found here.

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