[SEL] Early Switchboard Meters and Switchgear

[Michael P. Koryciak]

Sure there are....put together "Kits" of parts on Ebay,you'll be happy! 
I might even be interested.

Tod Engine wrote:

> All you need are massive contacts, lots of asbestos shielding and arc 
> extinguishers!  The fun of DC is the arcing, sparks, flashes and loud 
> noises!   We have a tiny 3 ton overhead crane at work dating to 1923.  
> It runs on 250 VDC and pegs the amp meter (300 amps) when a lift is 
> made.  Its all original so what technology they had then we are using 
> now. Now and then she puts on a show.
>
> I have access to large amounts of old switchboards, slate panels, 
> knife switches etc. from the local steel mills. Lots of 1916 era 
> Westinghouse and GE equipment. I wonder if there are any people out 
> there that collect this stuff just as we all collect old iron.  A 
> building I rent is a former powerhouse in a mill.
>
> Rick
>
> ----- Original Message ----- From: "Michael P. Koryciak" 
> <guitronics at comcast.net>
> To: "The SEL email discussion list" <sel at lists.stationary-engine.com>
> Sent: Saturday, July 16, 2005 9:20 PM
> Subject: Re: [SEL] Early Switchboard Meters and Switchgear
>
>
>> On relays, "quenching", or "spike" diodes are put across one of the
>> coils to absorb the voltage of the collapsing magnetic field.I imagine
>> the same thing will work with switches....in Audio Electronics, a
>> high-value (1 Meg ohm) resistor is used on the input of amplifiers to
>> eliminate the "Popping" noise of the switch.
>>
>> John Culp wrote:
>>
>>>> Quick breaks were fitted to DC switches to prevent arcing across as
>>>> the load current was broken. It's still a problem, even today!
>>>
>>>
>>>
>>> Direct current still works pretty much the same way as it has for a
>>> long time.
>>>
>>> John Culp
>>> Bristol, Tennessee, USA
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>>> SEL mailing list
>>> SEL at lists.stationary-engine.com
>>> http://www.stationary-engine.com/mailman/listinfo/sel
>>>
>>
>>
>
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