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 3 Phase Alternator AC output calculation
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ron_o
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United Kingdom
1052 Posts

Posted - September 01 2013 :  15:16:44  Show Profile Send ron_o a Private Message  Reply with Quote
AC output of a 3 phase alternator

step 1 ) measure output voltage and current from one coil

step 2 ) multiply the output voltage by the number of coils per phase = total phase voltage

step 3 ) take the square root of the number of phases ( in this example 3 so square root of 3 = 1.732

In this example lets say our total phase voltage for one phase is 15 volts and the current is 1.3 amps

STAR voltage = 15 volts x 1.732 = 25.98 volts
STAR current remains at 1.3 amps
Wattage in STAR = 25.98 volts x 1.3 amps = 33.774 watts

DELTA voltage remains at 15 volts
DELTA current = 1.3 amps x 1.732 = 2.2516 amps
Wattage in DELTA = 15 volts x 2.2516 amps = 33.774 watts

So irrespective of how wired (star or delta ) the output wattage remains the same

ron
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