Does res_line["loading_percent"] refer to a 3-phase line?

[timebis]

This discution is related to #this unactepted PR

Problem :

here is an extract of the Pandapower Basic Standard Types line :

name	r_ohm_per_km	x_ohm_per_km	c_nf_per_km	max_i_ka	type	q_mm2	alpha
NAYY 4x50 SE	0.642	0.083	210.0	0.142	cs	50	0.00403

here, max_i_ka = 142A correspond to the admissible current in one wire. This assumption is made according to classical constructor datasheet of thermal limit given per wire :

So, max_i_ka in pandapower is not the admissible current in one 3ph line system.

In the code we have :
res_line_df["loading_percent"].values[:] = i_ka / i_max * 100
Where i_ka is considered as the equivalent current going through 3 wire.

The fact that i_ka and i_max_ka are not for the same system (1 wire or the full cable) make the equation false.

Do you guys agree with me ?

Suggestion :

I can do a PR to change :
res_line_df["loading_percent"].values[:] = i_ka / i_max / 3 * 100

Best regard !

[jkisse]

A NAYY 4x50 cable already consists of 3 phases (+ 1 return), thus the 4x50. Here is a picture for clarification. It is just one cable - so, the values are correct, and no change is necessary.

[timebis]

Thanks for the remark but it's the point i'm trying to make.

For me, the limit (in A) given by constructors are given for 1*50.

[timebis]

I just understood my mistake..
I thought that I_ka was the equivalent current given for a single phase system. I don't why i got this in my mind, I made the calculation to verify it but I failed it ^^
Sorry for bothering.