preliminary equations

[zhen0427]

Fixes issue: # name and number of the issue

Changes proposed in this PR include:

Here you can elaborate on the chosen solution strategy, which changes did you make and which goal do they serve. Perhaps also which things are you still unsure of.

• ..

Could you please pay extra attention to the points below when reviewing the PR:

Here you can point out modules or complex implementation that require special attention, .e.g have a look at module foo.py and bar.py.

• ..

[sonarcloud]

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[mgovers]

probably nitpicking but in the equations i see some formatting things that could very easily be improved to make it more readable. E.g.:

here, substituting tan \sigma -> \tan \sigma will render it as

Similarly,

Y_\mathrm{series} & = & 1 & \times 10^6 * ( 1+ \mathrm{j} ) p.u. &.

may be rendered as Y_{\text{series}} = (1 + \mathrm{j}) \cdot 10^6 \,\mathrm{p.u.}

In addition, some underscores making the 0 as an index may be very welcome in cases like this:

Do you think it's a good idea to create a follow-up PR to go over those little things?

[nitbharambe]

probably nitpicking but in the equations i see some formatting things that could very easily be improved to make it more readable. E.g.:

here, substituting tan \sigma -> \tan \sigma will render it as

Similarly,

Y_\mathrm{series} & = & 1 & \times 10^6 * ( 1+ \mathrm{j} ) p.u. &.

may be rendered as Y_{\text{series}} = (1 + \mathrm{j}) \cdot 10^6 \,\mathrm{p.u.}

In addition, some underscores making the 0 as an index may be very welcome in cases like this:

Do you think it's a good idea to create a follow-up PR to go over those little things?

Lets leave the i0 part as thats the actual attribute of PGM, makes it easier to grasp

[mgovers]

probably nitpicking but in the equations i see some formatting things that could very easily be improved to make it more readable. E.g.:

here, substituting tan \sigma -> \tan \sigma will render it as
Similarly,
Y_\mathrm{series} & = & 1 & \times 10^6 * ( 1+ \mathrm{j} ) p.u. &.
may be rendered as Y_{\text{series}} = (1 + \mathrm{j}) \cdot 10^6 \,\mathrm{p.u.}

In addition, some underscores making the 0 as an index may be very welcome in cases like this:
Do you think it's a good idea to create a follow-up PR to go over those little things?

Lets leave the i0 part as thats the actual attribute of PGM, makes it easier to grasp

then please make it mono-space or put it in square brackets or something, because it does become confusing when dealing with multiple variables that may be multiplied, especially for sn and sn^2. e.g.: