international power systems
international power systems
(OP)
I have been reading with interest the discussions on this site and my complements to all. Being from Australia where everbody wants to sell thier electrical goods i see a lot of gear with different voltage frquency etc etc
I think it would be interesting to see how many different systems there are
to start the Aust. system is uniform for the whole country for industry and domestic 415v 50hz 3 phase 4 wire
(star) with MEN earth and stake. domestic usually 240V 50hz 2 wire with MEN. Safety equipment 32v ac ( industry special)
Over head lines 3.3 kv and up. Really big users get HVAC if they have licenced switchers(people)
the applicable base standard is AS3000 + the usual myriad of others
I would be interested to get data on your systems.
Thanks Don
I think it would be interesting to see how many different systems there are
to start the Aust. system is uniform for the whole country for industry and domestic 415v 50hz 3 phase 4 wire
(star) with MEN earth and stake. domestic usually 240V 50hz 2 wire with MEN. Safety equipment 32v ac ( industry special)
Over head lines 3.3 kv and up. Really big users get HVAC if they have licenced switchers(people)
the applicable base standard is AS3000 + the usual myriad of others
I would be interested to get data on your systems.
Thanks Don





RE: international power systems
1. Residential is usually a single phase three wire system 240V/120V and neutral, 60Hz (120V is center tapped from a single phase transformer 240V)
2. Commercial is often 3x240V(open delta-two 1-phase overhead transformers)/120V, 60Hz
3. Industrial is often 480V/277V, 60Hz, 3phase. Occasionally, 440V/254V 3phase 60Hz
4. Power distribution is 4.16kV 60Hz 3phase, 13.8kV 60Hz 3phase, and higher voltage systems that vary; however, they comply with ANSI C84.1-1977
RE: international power systems
Thanks for that. I'm learning all the time. As a discussion only, Iwould never have imagined that centre tap transformers would be used for distribution. We do use auto changing tapped tranformers but only to trim those last % pionts.
Am I correct in thinking you have 240 and 120 at the domestic or is it just 120V?
Again thanks
Don
RE: international power systems
The commercial sector or mixed commercial-residential sector has either open delta 240V (3phase)/120V (1phase, center tapped), 60Hz, 4wire system good to power a reasonably sized 3phase motor load, or the 208V (delta)/120V (star), 60Hz, 3phase (appearing often in institutional sector, e.g. schools, public buildings, etc.) that can power larger loads (~3000A switchgear and buses). The ever power hungry institutional sector seems to prefer 480V/277V, 60Hz, 3phase with an additional transfomation level providing 480V/240V/120V or 480V/208V or 480V/120V, 60Hz, 3phase for smaller loads. This may be somewhat linked to or conditioned by a real estate size.
RE: international power systems
It must be "interesting" to work on systems with so many options. Is the voltage supplied set by the consumer (read engineer/installer) or the supply company. Ours are set by regulation("law") & standards to only 240 1phase or 415 3phase (HVac by negotiation for reaallly big users (1.5 to 2 MW + ) my site 900A 415V,
thanks heaps
Is there any info on other systems from our other collegues ???
RE: international power systems
RE: international power systems
http://www.cenelec.org/
http://europa.eu.int/comm/enterprise/newapproach/legislation/guide/legislation.htm
RE: international power systems
RE: international power systems
http://www.iec.ch
for more info