UPS: Compensating for a high input voltage.

[Alastair Stevens]

2008/8/14 Richard <tuxbox.guru at gmail.com>

> According to the Gospel of St Wiki, (
> http://en.wikipedia.org/wiki/List_of_countries_with_mains_power_plugs,_voltages_and_frequencies
> )
>
> "Voltage tolerance of 230 V +10%/−6% (216.2 V to 253 V), to be widened to
> 230 V ±10% (207 V to 253 V) in 2008"
>
> The UK voltage is within specification, and I reckon your UPS is being a
> bit overly sensitive.
> The thing to watch is the Frequency of the mains... as this will change if
> the grid cant meet demands. (the more the grid cant deliver, the lover the
> Hz goes)
>
> Richard P


[OT]

Man, I'm still trying to find a solid, touchy feely explanation of how AC
power really works. Dammit, I'm an energy engineer (though not electrical
per se) and I still can't quite get my head around how power is transmitted
in an AC circuit, or how grid balancing works, or how frequency vs voltage
are affected by load etc, as you're discussing here.

Surely the frequency is ultimately governed by the rotational speed of the
generators? Unless power electronics and phase compensators are used on a
variable-speed driver, as in a wind turbine?!  Ho hum, any electrical
engineers out there?

AL

-- 
========================================
ALASTAIR STEVENS
* Web - www.altrux.me.uk
* Blog - www.altrux.me.uk/blog.html
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