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bakerocb
Joined: 15 Jan 2006
Posts: 727
Location: FAIRFAX VA
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 Posted: Sat Jul 07, 2012 8:48 am Post subject: battery boil/overheat |
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7/7/2012
Hello Ed, This posting from the aeroelectric-list archives may be of interest:
Match: #10 Message: #48521 Date: Feb 19, 2010 From: "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com> Subject: Re: B&C Regulators and water-falls
‘OC’ Baker
==========================
Time: 07:45:33 AM PST US
From: "Ed Anderson" <eanderson(at)carolina.rr.com (eanderson(at)carolina.rr.com)>
Subject: Re: Battery only time -Z-19RB clarification
I certainly agree, Bob. A clear case of a where my design focused on a very
low probability occurrence (boiling battery) ending up almost assuring that
at some point that switch would get in the incorrect position and cause a
problem.
In fact, has anybody on the list EVER experienced or have first hand
knowledge of someone who had a battery boil/overheat due to run away (over
voltage) alternator??
Ed
[quote][b]
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nuckolls.bob(at)aeroelect
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| Posted: Sat Jul 07, 2012 7:16 pm Post subject: battery boil/overheat |
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At 11:44 AM 7/7/2012, you wrote:
7/7/2012
Hello Ed, This posting from the aeroelectric-list archives may be of interest:
Match: #10
Message: #48521
Date: Feb 19, 2010
From: "Robert L. Nuckolls, III" <nuckolls.bob(at)aeroelectric.com>
Subject:
Re: B&C Regulators and water-falls
OC Baker
I'd forgotten about that one. I searched without success for a discussion on a Glasair battery box explosion. An RG battery suffered an extended OV condition within a tight battery box and apparently out-gassed to an ignition source within the box.
The box blew up and scattered pieces into the tail cone but the engine was magneto sparked and continued to fly. The pilot got it back on the ground and was able to tell the tale.
The modern alternator in an airplane, like a big gun in a battle, can be an essential component of survival. But unleashed in unintended circumstances it can be a substantial hazard too. FAST ov protection is a requirement in TC aircraft . . . for rare but compelling reasons.
--------------------
FAR23.1351(c) Generating System. There must be at least one generator/alternator if
the electrical system supplies power to load circuits essential for safe
operation. In addition-- (1) Each generator/alternator must be able to deliver its continuous rated power, or such power as is limited by its regulation system.
(2) Generator/alternator voltage control equipment must be able to dependably regulate the generator/alternator output within rated limits.
(3) Automatic means must be provided to prevent damage to any generator/ alternator and adverse effects on the airplane electrical system due to reverse current. A means must also be provided to disconnect each generator/ alternator from the battery and other generators/alternators.
(4) There must be a means to give immediate warning to the flight crew of a failure of any generator/alternator.
(5) Each generator/alternator must have an overvoltage control designed and installed to prevent damage to the electrical system, or to equipment supplied by the electrical system that could result if that generator/ alternator were to develop an overvoltage condition.
Bob . . . [quote][b]
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