2 Phase Wiring

What seems the most likely is that what is required is that pairs of heating elements are wired in series with a centre connection brought out so that they can be used on either 115v or 230v.

I have never heard of a two phase power system while it is possible it would be quite pointless.

While it may seem pointless, I have discovered that this is an antiquated form of power back when Edison was developing the light bulb and even further back than that. As stated this is going to a European country and it is known that some of them have maintained their original form of power supply in pristine condition.

I have also found that the wiring schematic would be essentially the same as single phase. That was my only concern.

Thank you for your comment.

most of Canada is wired for residential 2 phase. Each house has a common and 2 120 volts feeds to common, 180 degrees out of phase. (60 Hz system).

Most wall plugs are wired with a single phase and most small appliances run on 120V. When they want 240 volts they use the 2 120 volts out of phase feeds. Typically electric water heaters, dryers, ovens and the like run on the 240 volts.

Obviously you cannot get easy rotating fields like you can in 3 phase, so most motors are capacitor start and induction run. The capacitor forcing it to turn in the desired direction

hello aurizon,

Can u explain to me the action of two phase system if there is? Im very much confuse how does it looks like and its action or the flow? My colleages here laugh at me because i said to them that there really is a 2 phase system but i could not explain to them in a simple way because i dont have enough knowledge about it but i have read it in the book but only with short explaination. It would be of great help for me if u could provide me the information and better explanation as well.

Your favorable response is highly appreciated.

THank you in advance..

Best regards,

c3p1124

well, the common 2 phase house wiring is dealt with here.

http://www.securitytechnet.com/resource/hot-topic/homenet/Data_Communications.pdf

There is also an archaic 2 phase system with 4 wires and a 90 degree phase angle. A search finds these hits. A look among them may find you some answers

http://www.google.ca/search?hl=en&q=%222+phase%22+%2B%224+wire%22++&btnG=Search&meta=

tnx for the reply..

Though the product user a cetre-tapped is not demanded, but it may be more use-ful as it can be used by 110V users in parallel & 220V users in series.

Some countries like Canada [as told by aurizon ] & Arabian States like Saudi-Arabia & Middle east countries have House-hold supplies 110+110 V, as products from all over the world is imported. People have facillity BUT MOSTLY confusion & burn their Appliances.

When some-one talks of 2Ph it does not mean that a 2Ph power system required but it can be connected to Ph-to-Ph supply. [110V system gets some 200V & 220V system gets 390V approx]

This sometimes needed in areas where Line conditios are poor.

I faced this problem in Mobile X-Ray unit in Rural areas & Developd a 400V I/P supply Transformer, wound for 220 output. And used the unit to load 2Phases instead of a single phase.

Of cource there is no 2ph system nowadays. But it existed sometime back.

However to have LOADs rated for 2Ph does not mean that such a system should exist. You can connect Ph-Ph [ie nearly 220V in 110V system & 390V in 220V system]

Note: The idea given by some gentleman to provide a centre-tap for connecting in parallel when required is a good idea & will make your product multi-purpose. It can also be used by countries having 220V systems

Please provide your 3-phase voltage level and also 2-phase voltage level.

I think we must be careful to distinguish between 2 phase and bi phase, a bi phase supply would have three lines with a phase difference of 180° between the phase's this would provide either 110v or 220v to the consumer.

A 2 phase system is possible but a 2 phase-bi phase system with a 90/270° difference between phase,s with 3 or 4 or 5 lines would be better for motors although four stator windings instead of the usual three are needed.

In America I have encountered a three phase bi-phase system where the customer transformer has a normal delta type output with 220v between phase's but one winding has a centre tap which is grounded and provides a 110-0-110v output for lighting etc

In Europe there is no 110V. They use single phase 220v. /50Hz .If they need 2 phase it means 380V ( 220*sqrt(3)) and phase angle between 120degrees. It menas two hot lines. If it is only heater it doesn't mater what is the phase angle and Hz. Just make sure you have the proper voltage heater. If they need just 220V you can wire them the same way we wire here 120V ( 1 hot, 1 neutral,1 ground) . But if you have any kind of AC motor it is not going to work the same way.

It is a little strange because nobody use there 2 phase wiring.

May be they want 220V heater (and they say 2 phase because they don't know that in America 110 and 220 is single phase ) to make sure it will work there, not 2 phase european wiring.

The only two phase system I have worked with has 4 wires from the generator to the motor, plus ground. 230 VAC. Phase A & B were isolated from each other, but there must be others way to inter-connect them. It was more like having two single phase generators running two single phase motors but, the generator and motor were both all built into the same assembly. The generator was running off a diesel engine, (formally connected to a hydro) prime mover and the motor was powering a Frick sawmill. Yes it was very old. If you placed a two channel O-scope on the generator output, when Phase A peaks = 0 & 180 then Phase B peaks = 90 & 270. Quite different from center taping a single phase transformer.

I think the you will need to find out how the phases are inter-connected (or not) at the location and match the heaters to the power available. At the sawmill, one set of heaters could be run off Phase A and one set off Phase B.

Good Luck

A two phase system typically consists of two equal voltages 90 degrees apart in phase and may have the two phases independent and insulated from each other or, may be connected together conductively. There are 4 different two phase connections available. A good reference is the "Electrical Engineers' Handbook, Electric Power" by Pender and Del Mar, Editors; published by John Wiley & Sons.

Two phase connections are discussed on page 10-12 in the edition I have (Fourth).

There are 2 socket outlet voltages in Peru and Bolivia, from memory ("I haven't got a memory, only a forgettory"), and 2-phase there is simply 110-0-110V with the outer two conductors in use; 0V is neutral and the 110V each 180deg out of phase with each other.

Many instrument suppliers, looking for a global market, manufacture their equipment 110/220V dual voltage. The voltage change within the instrument is achieved by swapping jumpers on the power supply circuit board so as to match the transformer windings to the supply voltage. One does have to replace the fuse on occasions - half-ish the voltage means double-ish the current for the same power.

hello friend,

if motors are not used then simple wiring con be used.if it does not work then use 3 to 2 phase converter circuit available in market

vikas_303@rediff.com