def parametrize_lines(mv_grid):
    """ Set unparametrized branches to default branch type
    
    Parameters
    ----------
    mv_grid: MVGridDing0
        MV grid instance

    Note
    -----
    During the connection process of satellites, new branches are created - 
    these have to be parametrized.
    """
    for branch in mv_grid.graph_edges():
        if branch['branch'].kind is None:
            branch['branch'].kind = mv_grid.default_branch_kind
        if branch['branch'].type is None:
            branch['branch'].type = mv_grid.default_branch_type
