catflap.org Online Dictionary Query

  Cascade system \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.