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Cable Configuration (schedule)

With a new cable, typically the first action is to set up the cable configuration.  

On the configuration page, if required, the designation,  description, source or destination cable be changed.  

The cable voltage and frequency can be set.  In the application, cable inductance and reactance are always calculated, and this is accurately reflected for different frequencies.  For DC cables set the frequency to zero.  

The information box displays the equivalent single phase voltage and is hidden for d.c. cables.

Changing the voltage will change the available cables under the cable source drop-down list.  The application has a range of cables up to 33 kV.

After selecting the cable source, the exact cable type (conductor, cores, etc.) is then selected.  Available cable types depend on the selected cable source.

Depending on the cable selection, other input may be required.  For example, a single core cable needs the arrangement configuration to be specified.  This use of requiring the user to input the least amount of information, based on current requirements is employed throughout the application.

After selecting the cable source and type, the cross-sectional area or CSA is set.  If this is not known at this stage, choose any CSA and a suitable value can be determined in the current capacity dialogue.

Finally the cable length, and soil resistivity is required.  

The application calculates positive and zero sequence impedances for the cable by IEC 60909.  The soil resistivity is used in the calculation of zero sequence impedance. If you don't know the actual soil resistivity, leaving it at the default value is a good option.

Clicking the update button saves any changes.


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