In case network geodata are not in The World Geodetic System (WGS84), that is latitude/longitude format, but in some of the map-projections, it may be converted to lat/long by providing name of the projection (in the form 'epsg:<projection_number>' according to spatialreference). A sample of converting geodata from mv_oberrhein network can be found in the tutorial.
pandapower.plotting.plotly.geo_data_to_latlong