[Milsurplus] Aircraft Electrical Question

[Ray Fantini]

I have couple late sixties dynamotor that produce three phase 115/400 cycle that have one leg grounded. So A to B = 120 volts, A to C ( with C grounded = 120 volts and b to C = 120 volts. So it's a true three phase system but C is grounded.
Weird thing is the dynamotor uses a solid state regulator to control output voltage so they are rather stable and good sources for 115/400 3 phase but the noise will run you out of the room.
Ray Fantini KA3EKH

-----Original Message-----
From: milsurplus-bounces at mailman.qth.net [mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of Peter Gottlieb
Sent: Wednesday, January 12, 2011 12:39 PM
To: milsurplus at mailman.qth.net
Subject: Re: [Milsurplus] Aircraft Electrical Question

I'm no expert but I thought it all comes from 3 phase Wye grounded neutral.


On 1/12/2011 11:49 AM, Jack Antonio wrote:
> This is concerning an aircraft using 120V 400 cycle
> power. And I realize it may vary between aircraft,
> so I'm wondering if there is "standard practice"
> concerning this.
>
> Is one side of the AC line grounded? Is the 120V
> floating, or balanced with respect to ground?
>
> If one side is grounded, do they use a single point
> ground, or use the airframe as a return conductor?
>
> Looking at some gear here in the shack that uses
> 400 cycle, which is what got me wondering.
>
> Thanks
>
> Jack Antonio WA7DIA/4
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