Chapter: Electrical Drives & Control : Starting Methods

D.O.L Starter

It is recommended that large three phase squirrel-case induction motors be started with reduced voltage applied across the stator terminals at starting.

D.O.L STARTER

^·It is recommended that large three phase squirrel-case induction motors be started with reduced voltage applied across the stator terminals at starting.

^·But small motors up to 5HP ratings may however be started Direct – ON-Line (DOL)

Direct-on-line method of starting of induction motors applicable up to a rating of 5 HP is shown in fig3.4. In the circuit in addition to fuses, thermal motor windings against overload.

Derivation for starting current and torque in case of DOL starters

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Electrical Drives & Control : Starting Methods : D.O.L Starter |