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Valin
Joined: 13 Apr 2010
Posts: 31
Location: Colorado
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 Posted: Sat Apr 24, 2010 6:31 pm Post subject: Z-12 Power Grid Behavior |
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Hello Bob K. and anyone else who wants to weigh in…
Could I please get confirmation that I’m interpreting the Z-12 power grid design behavior correctly (Z-12 = Main Alt, Standby Alt, One Battery, Main Bus, E-Bus) represented in these statements below?
<![if !supportLists]>· <![endif]>One can normally fly with E-Bus feed switch ON since an alternator energized Main Bus is at a higher voltage than the battery and it will feed the E-Bus thru the diode when operating. So even if both alternators fail and battery contactor failed the E-Bus will receive battery power without any action required from the pilot.
<![if !supportLists]>· <![endif]>If the Battery Contactor Relay is opened, isolating the battery from the Main Bus, while either alternator is operating, the alternator will continue to provide good power to the Main Bus and E-Bus without the battery in the circuit.
Are these interpretations correct?
In the bullet two scenario where the engine is running, an alternator is making power, and the battery contactor relay is open, will there be any power quality or stability issues with the electrical system without the battery in the circuit?
Thanks,
Valin
[quote][b]
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user9253
Joined: 28 Mar 2008
Posts: 1921
Location: Riley TWP Michigan
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| Posted: Sun Apr 25, 2010 5:16 am Post subject: Re: Z-12 Power Grid Behavior |
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| Quote: | | One can normally fly with E-Bus feed switch ON |
Doing so will not hurt anything.
| Quote: | | since an alternator energized Main Bus is at a higher voltage than the battery and it will feed the E-Bus thru the diode when operating. |
Not true. The Main Bus and battery will be at essentially at the same voltage. The diode will NOT conduct with the E-Bus switch closed because the diode has been shorted out by the parallel current path through the E-Bus switch.
| Quote: | | So even if both alternators fail and battery contactor failed the E-Bus will receive battery power without any action required from the pilot. |
That is true as long as the E-Bus switch is closed.
| Quote: | | the Battery Contactor Relay is opened, isolating the battery from the Main Bus, while either alternator is operating, the alternator will continue to provide good power to the Main Bus and E-Bus without the battery in the circuit. |
Probably, but not certain. It all depends on the components used.
| Quote: | | will there be any power quality or stability issues with the electrical system without the battery in the circuit? |
I do not think so, but am not sure.
Joe
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Joe Gores |
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