Dual Voltage 3 Phase AC Generator - CR4 Discussion Thread

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Anonymous Poster	Dual Voltage 3 Phase AC Generator 12/29/2010 1:04 PM
	hi all, would you please help me to understand this, i understand that when i change connection from high to low ''380v to 220v'' on 3 phase dual voltage ac generator, i am making two coils on parallel between each two lines, so they will be two ac 3 phase generators running on parallel excited from the same rotor, and when i connect to high i am making each two coils on series between two lines, thats on dual voltages 6 coils ac generator. so if its 200kva generator: when its connect on high it can carry 300amps, while when its connected on low it can carry 600amps. how about when its dual voltage generator with 3 coils only, i mean when its on high it will be star connection while when its on low it will be delta connection, will the amps be different while its on high and low? because when its on high, two coils will be on series. while on low, one coil will be between two line voltages. hope you got what i mean thanks
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North of 60 Guru Join Date: Mar 2007 Location: Iqaluit, NU. Canada Posts: 1854 Good Answers: 140	#1 Re: dual voltage 3 phase ac generator 12/29/2010 1:17 PM
	Power is power... 3 phase kW = V * I * 1.73 * PF / 1000. For the same amount of delivered power... When you double the voltage you half the current and vice versa... when you half the voltage you double the current. A genset will deliver 60kW... at 600 volts... kW * 1000 / V * 1.73 * PF = 57 amps (assumes unity PF). A genset will deliver 60kW... at 300 volts... kW * 1000 / V * 1.73 * PF = 115 amps (assumes unity PF). __________________ Joe Contractor to Electrical Inspector, "What do you mean you are going to make me follow the code?".
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Happy singh Power-User Join Date: Jul 2010 Location: India Posts: 162	#2 Re: dual voltage 3 phase ac generator 12/29/2010 2:14 PM
	Recall the relation between line current and phase current in Star as well as Delta circuit. The current capacity of coil is remains same. When Coils are connected in Star, The voltage at terminal shall be high i.e. V (line) = Sqrt (3). V (Phase) and Line current would be equal to phase current. When Coils are connected in Delta , The voltage at terminal shall be low i.e. V (line) = V (Phase) and Line current would be I (line) = Sqrt (3). I (Phase) . __________________ When was last time you did something for first time.
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Tornado Guru Join Date: May 2009 Location: Richland, WA, USA Posts: 21017 Good Answers: 795	#3 Re: Dual Voltage 3 Phase AC Generator 12/29/2010 3:03 PM
	380/220 is a star-delta combination. In a series/parallel combination, the high voltage would be twice the low; e.g., 480/240. __________________ In vino veritas; in cervisia carmen; in aqua E. coli.
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Happy singh (1); North of 60 (1); Tornado (1)

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