pyeletrica

Fundamental tools for electrical engineers.

Tools

This is the avaliable functions in pyeletrica:

• sind
• cosd
• tand
• polar
• rect
• divI
• ZIbase
• Zparallel
• plot3vectors
• plotmho
• to_linecomp
• to_symcomp
• overcurrent_time

Help

You can use the documentation to understand how the function works .

>>> import pyeletrica as elt
>>> help(elt.to_symcomp)
Help on function to_symcomp in module pyeletrica:

to_symcomp(Va, Vb, Vc, ndigits=3)
    Calculate symmetric component vector from line vector.

    parameters
    ----------
    Va: array-like
        [module, angle (degrees)]
    Vb: array-like
        [module, angle (degrees)]
    Vc: array-like
        [module, angle (degrees)]
    ndigits: int
            Precision in decimal digits.

    Returns
    -------
    output : array-like
           (V1, V2, V0), each vector being in array format with
           [module, angle in degrees], where V1 is positive sequence,
           V2 negative sequence and V0 zero sequence.

Example Usage

---

Calculate Symmetric Component from line quantities. Considering the currents Ia = 10∠0° amps, Ib = 9∠-110° amps and Ic = 10.93∠129.3° amps we get I1 = 9.945∠6.407° amps, I2 = 1.116∠0° amps and I0 = 0∠0° amps

In [1]:elt.to_symcomp([10,0],[9,-110],[10.93,129.3])
Out[1]: ([9.945, 6.407], [1.116, 0], [0, 0])

Plot vectors.

In [1]: elt.plot3vectors([[10,0], [9,-110], [10.93,129.3]], ['Ia', 'Ib', 'Ic'])

Calculate base impedance and base current from apparent power and voltage.

In [1]: Zbase, Ibase = elt.ZIbase(10e6, 69e3)

In [2]: Zbase
Out[2]: 83.67395205646751

In [3]: Ibase
Out[3]: 476.1

Complex numbers computation. You must perform complex number operations in Python using the rectangular form.

In [1]: v_sum = elt.rect([10,120]) + elt.rect([10,-120])

In [2]: v_sum
Out[2]: (-10+0j)

In [3]: elt.polar(v_sum)
Out[3]: [10.0, 180.0]