\Cascade system\ (Elec.)
A system or method of connecting and operating two induction
motors so that the primary circuit of one is connected to the
secondary circuit of the other, the primary circuit of the
latter being connected to the source of supply; also, a
system of electric traction in which motors so connected are
employed. The cascade system is also called
{tandem, or concatenated}, {system}; the connection a
{cascade, tandem, or concatenated}, {connection}, or
{a concatenation}; and the control of the motors so obtained
   a
{tandem, or concatenation}, {control}.
Note: In the cascade system of traction the cascade
      connection is used for starting and for low speeds up
      to half speed. For full speed the short-circuited motor
      is cut loose from the other motor and is either left
      idle or (commonly) connected direct to the line.