Product Profile of Auto Transformer Starter/ Slip Ring Starter

Auto Transformer Starter/ Slip Ring Starter uses an auto transformer to reduce the voltage applied to a motor during start. The Starter is designed to a number of output taps and be set-up to provide a single stage starter, or a multistage starter. The Starter offers taps at 50%, 65% and 80% voltage, enabling the motor to be started at one or more settings. The Auto Transformer Starter/ Slip Ring Starter is equipped with controlling rheostat that can be either stud or contactor types.

Key Features of Auto Transformer Starter/ Slip Ring Starter

• The slip ring induction motor has two distinctly separate parts, one is the stator and other is the rotor.
• The stator circuit is rated as same in the squirrel cage motor, but the rotor is rated in frame voltage or short circuit current.
• Usually started with full line voltage applied across its terminals.
• Motors have external resistance connected to its rotor circuit so that the value of starting current is adjusted or kept minimum, by increasing the resistance of the rotor circuit.
• Starting torque is increased due to the improvement in power factor.
• The controlling rheostat may be of either stud or contactor type. It may be either hand operated or sometimes automatic.
• The 3-phase supply to the stator has a switching contactor along with over-load and no or low-voltage protective devices.
• There might be also an interlock provided to ensure the proper sequential operation of the control gear and starting devices.