def METHOD_NAME(self, net):
    vn_hv_kv = read_from_net(net, self.trafotable, self.controlled_tid, 'vn_hv_kv', self._read_write_flag)
    hv_bus = read_from_net(net, self.trafotable, self.controlled_tid, 'hv_bus', self._read_write_flag)
    vn_hv_bus_kv = read_from_net(net, "bus", hv_bus, 'vn_kv', self._read_write_flag)
    if self.trafotype == "3W" and self.side == "mv":
        vn_mv_kv = read_from_net(net, self.trafotable, self.controlled_tid, 'vn_mv_kv', self._read_write_flag)
        mv_bus = read_from_net(net, self.trafotable, self.controlled_tid, 'mv_bus', self._read_write_flag)
        vn_mv_bus_kv = read_from_net(net, "bus", mv_bus, 'vn_kv', self._read_write_flag)
        self.t_nom = vn_mv_kv / vn_hv_kv * vn_hv_bus_kv / vn_mv_bus_kv
    else:
        vn_lv_kv = read_from_net(net, self.trafotable, self.controlled_tid, 'vn_lv_kv', self._read_write_flag)
        lv_bus = read_from_net(net, self.trafotable, self.controlled_tid, 'lv_bus', self._read_write_flag)
        vn_lv_bus_kv = read_from_net(net, "bus", lv_bus, 'vn_kv', self._read_write_flag)
        self.t_nom = vn_lv_kv / vn_hv_kv * vn_hv_bus_kv / vn_lv_bus_kv