Who exactly decided that there was a frequency change? It seems
strange that they could have known if there are no monitors to check
and this is not a central problem. Of course, if this was a resonant
transformer and the guy shorted it, or he hooked the transformer
to a portable generator that the construction company was using, or
he temporarily powered it with a solenoid using a jackhammer for a
slug...
>> Who knows hertz and 60 volts. A serviceman across the hall did
something
>
>Let me guess. 60Hz and 60V. It's very difficult (I'd say impossible,
but
>then somebody will find a way !) to change mains frequency by miswiring
a
>transformer. Voltage, sure.
>
>Actually, I do have a device somewhere that provides the 25Hz for UK
>telephone bells from the AC mains. It contains a transformer with a
>winding resonated to 25Hz by a capacitor. And it's 'kicked' into
>oscillations by a 50Hz mains winding on the same core. But that's
hardly
>the sort of thing you can make 'by accident'.
>
>> [When you get to the machine room, power line monitors etc.]
>> Don't make me laugh! Our machine room is a closet.
>
>That doesn't prevent you having power line monitors.
>
>> Oh, and who uses 400hz for line frequency?
>
>I've seen it used on aircraft equipment (small, light transformers and
>smoothing caps). Didn't IBM use it on some mainframes/minis?
>
>>
>> I am officially here, by the way. CILCO is still yelling at A&B
Construction
>> (Or whomever they were...) and my boss wants to go help. The
machines
>> seemed to care more about halving the line voltage (Which I wasn't
told
>
>Oh, indeed. Halving the line voltage will cause all sorts of problems.
>Few power supplies can cope with that and give the rated outputs.
>
>> about) than the frequency change...
>> -------
>>
>
>-tony
>
>
______________________________________________________
Get Your Private, Free Email at
http://www.hotmail.com
Received on Mon Jun 01 1998 - 17:48:19 BST