Re: MD-80 Electrical

Date:         17 May 98 00:42:46 
From:         wb8foz@netcom.com (David Lesher)
Organization: NRK Clinic for habitual NetNews Abusers - Beltway Annex
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ehahn@mitre.org (Edward Hahn) writes:
>The reason for having three-phase electrical equipment is two-fold.  1) it
>allows three-phase heavy-duty motors to be driven (such as in the stabilizer
>trim on a B727), and 2) redundancy: if one of the phases shorts out, a
>three-phase motor will still operate.

Sort-of... A 3-phase motor will not start when missing a phase
but it may limp along if already going. Because "single-phasing"
is often destructive to the motor, larger units have 'loss-of-phase'
protection that shuts down the motor.

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