[email protected] wrote:
> The most common 3-phase voltages are the increasing (will eventually
> become 400V in year 200X something) European 380V (line to line with
> 220 line to neutral) or the diminishing (will reduce to 400V
> eventually) UK 415V line to line (240V line to neutral) The
> US/Canadian most common three phase is 208V (line to line) with 120V
> line to neutral.
>
> As far as connectors are concerned there are hundreds of them. From
> 3-wire to 5-wire and each ampacity rating being different yet. Each
> country has specific requirements (strangest of the ones I have seen
> are the rigid coaxial conductors of Australia with monster connectors,
> used in UPS power backup systems)
>
> Both Delta and Y styles are globally available. If it is used in a
> commercial environment with offices, typically the input is a Delta
> and the output of the main transformer is a Y to reference the neutral
> to earth potential.
>
> Good Luck
> Hans
>
I cannot fully agree with Hans. We are exporting tobacco processing
machinery all over
the world and we encountered following three phase systems:
Europe (continental)
400V/230V, (sometimes 380V/220V). , 50Hz
Normally you encounter a Y configuration with
earthed central point (TN, TNS, TNSC, TT according to IEC 38).
US
480V or 460V phase to phase., 60Hz
Delta or Y configuration.
With delta configuration one always has a IT-Net.
Even Y configurations are not always connected to earth (IT)
Canada
575V phase to phase, 60Hz.
Mostly IT networks.
Japan
>From electrical point of view, Japan is divided in two countries:
230V Phase to Phase, 60Hz
Delta configuration, one phase connected to earth !!!
400V/230V 50Hz, as in Europe.
If the configuration is different from Y with earthed central point,
it is you'll probably get into troubles because the voltage of some
phases
to earth is higher than the rating of the capacitors in the power line
filters.
Leakage currents are also very high.
Hope this helps
George
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