TELECOM Digest OnLine - Sorted: Re: Tie Lines was Re: Foreign Exchange (FX) Lines Still in Use?

Re: Tie Lines was Re: Foreign Exchange (FX) Lines Still in Use?

Al Gillis (
Sun, 29 May 2005 20:02:39 -0700

Robert Bonomi <> wrote in message

(Much Snippage ... about power line frequencies not at 60 Hertz (or Cycles
per Second)

> One of the down-sides to 25-cycle power was that _transformers_ had to
> be built heavier for the lower line frequency. Stuff that was build
> with the existence of lower frequency power worked just fine when
> connected to a higher-frequency source. Unfortunately, when you took
> something that had been designed to be 'just adequate' on 60-cycle
> power, and plugged it into a 25-cycle source, a frequent result was
> 'letting the magic smoke' out of the transformer. A *RUDE* surprise
> for someone who moved into one of those 25-cycle 'islands' from the
> mainstream of power distribution.

Transformer weight is one of the big reasons much aircraft AC power
operates at 400 Hertz. MUCH smaller transformer cores = less weight =
greater payload or smaller engines.

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