What is it called when the 60hz line power becomes something else? - test-drb@ccmp.vtda.org

1 Jun 1998

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

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