The built-in line constants calculator computes electrical parameters of overhead lines and underground cables. This calculation logic can handle power frequency of 50 or 60 Hz, and length measurements in English or metric units.
A library of conductor parameters comes with the Line Database. You can modify these parameters and add new conductor types to the library.
The program computes overhead-line parameters using Carson's formula. This method gives more accurate results than the commonly-used hand formulas, especially for:
•Zero-sequence mutual parameters.
•Positive sequence parameters when ground wires are present.
The program logic can model overhead transmission lines with:
•One or more single-, 2- or 3-phase circuits on the same or adjacent right-of-ways.
•One or more ground wires, both segmented and unsegmented.
•Transposed and untransposed circuits.
•Any number of sections with phase transpositions between them.
The program computes cable parameters using Amatani's method, which is known for its ability to handle circuits with complex sheath and pipe configurations, including:
•Pipe-type, oil-filled and plastic cable with single core or three cores.
•Cable sheaths that are single-point bonded, solidly bonded or cross-bonded.
At any time, you can open a line – which can have multiple sections of overhead and underground constructions over multiple corridors, change its configuration and parameters, and ask the program to compute and display:
•Branch impedance and admittance matrices in the phase domain.
•Nodal capacitance and susceptance matrices in the phase domain.
•Positive- and zero-sequence self-impedance and capacitance.
Line impedance calculation results can be transferred readily to ASPEN OneLiner and ASPEN Power Flow through disk files and/or Windows’ clipboard.