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Electrical Engineering Terms A

ABB Drive Assistant

For ABB Drives, particularly the ACS355 Series, the Drive Assistant provides a convenient method to program and control the ABB Drive and electric motors. There are two version, the Basic with a one-line display and the Advanced with a three line display.

Amortisseur Winding.

In an AC synchronous motor, a squirrel-cage winding embedded near the outer surface of the rotor assembly. Because DC is applied to the rotor field of the AC synchronous motor for synchronization at running speed, the motor cannot be started with the DC-field voltage applied (too much slip). Instead, it must be started as a squirrel-cage induction motor: the amortisseur winding is used for starting purposes only.

Autotransformer.

A type of transformer that is void of isolation in which one winding serves for both the primary and secondary circuits. When used as a step-down transformer, the primary circuit is connected across the full winding, and the secondary circuit is tap-connected between part of the winding and one end that is common with the primary circuit. When used as a step-up transformer, the secondary circuit is connected across the full winding, and the primary circuit is tap-connected between part of the winding and one end that is common with the secondary circuit.

About Ahmed Faizan

Mr. Ahmed Faizan Sheikh, M.Sc. (USA), Research Fellow (USA), a member of IEEE & CIGRE, is a Fulbright Alumnus and earned his Master’s Degree in Electrical and Power Engineering from Kansas State University, USA.

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Electrical Engineering Terms E

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