code: def import_lv_stations(self, session):
          
  
          # get ding0s' standard CRS (SRID)
          srid = str(int(cfg_ding0.get('geo', 'srid')))
  
          # get list of mv grid districts
          mv_grid_districts = list(self.get_mvgd_lvla_lvgd_obj_from_id()[0])
  
          lv_stations_sqla = session.query(self.orm['orm_lv_stations'].mvlv_subst_id,
                                           self.orm['orm_lv_stations'].la_id,
                                           func.ST_AsText(func.ST_Transform(
                                             self.orm['orm_lv_stations'].geom, srid)). \
                                           label('geom')).\
              filter(self.orm['orm_lv_stations'].subst_id.in_(mv_grid_districts)). \
              filter(self.orm['version_condition_mvlvst'])
  
          # read data from db
          lv_grid_stations = pd.read_sql_query(lv_stations_sqla.statement,
                                               session.bind,
                                               index_col='mvlv_subst_id')
          return lv_grid_stations
docs: Import lv_stations within the given load_area
          Parameters
          ----------
          session : sqlalchemy.orm.session.Session
              Database session
  
          Returns
          -------
          lv_stations: :pandas:`pandas.DataFrame<dataframe>`
              Table of lv_stations