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Thread: 2 phase 240 volts?
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10th March 2008, 09:51 AM #31
GRAVY
Now that's a brilliant resource - Folks, click on the HOME link and have a read ......excellent information for trivial buggers like me
thanks!Steve
Kilmore (Melbourne-ish)
Australia
....catchy phrase here
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10th March 2008, 07:24 PM #32
Electrician
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“I do not think there is any thrill that can go through the human heart like that felt by the inventor as he sees some creation of the brain unfolding to success... Such emotions make a man forget food, sleep, friends, love, everything.” - Nikola Tesla.
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10th March 2008, 07:41 PM #33
Senior Member
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Phases
The word "phase" can only be used when electrical phase displacement is exactly 120 degrees.
CheersJuan
"If the enemy is in range, so are you."
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11th March 2008, 10:31 AM #34
Jaun is quite correct.
I think the reason that three-phase is so prevalent is that three-phase is probably the effectivenesses of transmission. The use of three-phase and hence three active conductors (no neutral required) allows three times the power that can be transmitted over single-phase (one active and one neutral conductor). i.e a three-phase transmission line using 50% more copper allows 300% more power than single-phase.
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11th March 2008, 07:10 PM #35
Electrician
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My original statementThe word "phase" can only be used when electrical phase displacement is exactly 120 degrees.In most practical applications however the number of phases in power generation is limited to 3 and hence 120 is the most common number of degrees.
1. For any one machine frame, the output is;
1 phase - about 65%.
2 phases - about 90%.
3 phases - about 96%.
2. The power delivered to or taken from a 3 phase system is more constant. In a single phase system, the power curve pulses at twice the line frequency. With 3 phases, the pulses are 6 times the line frequency & do not cross the zero axis like the single phase system (there is no "zero power" point). Since the power is more constant, the torque of a rotating machine is more constant, which results in less vibration.
3. With one type of 3 phase connection, there are 2 voltages available (Star).
4. A 3 phase machine can be smaller than a single phase machine for the same power output.
5. In a distribution system, the total quantity of material needed for 3 conductors is less than that required for the equivalent single phase system.“I do not think there is any thrill that can go through the human heart like that felt by the inventor as he sees some creation of the brain unfolding to success... Such emotions make a man forget food, sleep, friends, love, everything.” - Nikola Tesla.
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