@srinudama • 03 May, 2011
generally we heard about single phase electricty and three phase why not two phase
@PraveenKumar Purushothaman • 03 May, 2011 Actually, 2 Phase Power exists... but they are not so efficient... Please see Two-phase electric power. 😀
It has an angle deviation of 90° and three phase are 120°! 😀
@shubhankar • 03 May, 2011 actually the losses are less and efficiency is optimised (i.e max) in three phase system and the economics part is well taken care of a compared to 2 phase or other multiple phases excluding 3 phase
@narayana murthy • 03 May, 2011
srinudama
generally we heard about single phase electricty and three phase why not two phase
hey who told you that 2 phase is not using by my knowledge we are using 2 phase in railways
@PraveenKumar Purushothaman • 03 May, 2011
narayana murthy
hey who told you that 2 phase is not using by my knowledge we are using 2 phase in railways
Hey NM, thats something new to hear... How is it possible in rlys???
@shubhankar • 03 May, 2011 huh? two phase in railways? railways employ dc series motor commonly or ac series very seldom. if only ac supply is to be used then 11 to 16 kV is used..can you explain the two phase system please. the two phase which i think is the main winding and the other one is the auxillary starting winding
@narayana murthy • 04 May, 2011 actually i don't know much about them while explaining about 3 phase to 2 phase conversion our sir told how we do it and there apps then i asked as "sir,where we use 2 phase supply"
then he replied as we use them in railway power on supply to the lines
@Chandrakiran • 18 Jun, 2011 2 phase supply have very little applications in transformers (scott connection) and used in 2 phase Induction Motors ( used in servomechanisms ranges from watts to few hundreds of watts) also 2 phase Induction drive is used in some ac tachometers as generators to measure angular velocity
@zenith999 • 05 Mar, 2013 • 2 likes Why three phases? Why not two phase? In 1-phase and 2-phase power, there are 120 moments per second when a sine wave is crossing zero volts. In 3-phase power, at any given moment one of the three phases is nearing a peak. High-power 3-phase motors (used in industrial applications) and things like 3-phase welding equipment therefore have even power output. And we can reduce current in each phase when we increasing the phases but better to go for 3 phase because in view of good economical insulation cost, maintainace, efficiency and power transmission.
however some special applications runs with two phase and higher than 3 phase they are specially used in industrials.

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