[Boatanchors] Electrolytic Reforming Time

[J. Forster]

You do the logical thing.

Use a slow-blow fuse or delayed action circuit breaker with a time-current
profile sufficient for the startup surge and a current rating sufficient
for the normal operating current.

BTW, I would not put a resistor in the neutral line, but use a current
probe or cureent transformer. If you have neither, a small current
transformer can be made up from almost any small filament transformer and
a couple of feet of hookup wire.

-John

==============




> Look fellas,
>
> Why don't we all just sit there with our hair-trigger, smart-arse
> responses personally insulting each other and then responding with our
> half-conscious defence mechanisms at high alert?
>
> How very churlish would it be to actually suggest:
> 1. put a small resistor in the neutral lead of the incoming power cord
> 2. connect up a mains variable autotransformer, eg, a Variac type
> 3. connect a DVM, or a CRO across the small resistor
> 4. switch on and observe what happens at switch on with various levels of
> mains input Voltage, say, plus and minus 30%
> 5. calculate the required fuse to cover maximum start-up current.
> If the value so calculated is different from what the manual opines, what
> are you going to do? Sit at your keyboard and continue to make smart-arse
> comments, or actually do something that makes safe sense for the long
> term?
>
> 73 de Brian, VK2GCE.
>
>
>
>> rbethman <rbethman at comcast.net> wrote:
>>
>> No incorrect reading whatsoever.
>>
>> I also have all sort of sea, air, and ground based equipment.
>>
>> These include things like AN/URR-13A, (2).  Built in 1951.
>>
>> The fusing is done by the manual.
>>
>> Won't do anything about the line filters, nor the internal
>> electrolytics.  If you even remotely believe that those capacitors are
>> just fine, then you are dreaming.
>>
>> N0DGN
>>
>> On 12/31/2011 5:55 PM, J. Forster wrote:
>> > That's your (incorrect) reading of what I wrote.
>> >
>> > Sea and ground based Mil gear has fuses. The value specified should
>> not be
>> > exceeded.
>> >
>> > Airborn equipment sometimes relys on external breakers or fuses. Those
>> > should be of the correct type and rating also, and connected as
>> originally
>> > intended.
>> >
>> > I have seen several pieces of equipment damaged or destroyed by
>> incorrect
>> > overfusing, often because a previous owner didn't ask why a fuse blew.
>> >
>> > And I don't drill holes in gear.
>> >
>> > -John
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