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khans
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Join Date: Nov 2013
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No Load Line Voltage

11/03/2013 6:35 AM

In a 50 kVA, star connected 440 V, 4-phase 50 Hz alternator, the effective armature resistance is 0.25 ohm per phase. The synchronous reactance is 3.2 ohm per phase and leakage reactance is 0.5 ohm per phase.

so the no load line voltage will be ??
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lyn
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#1

Re: no load line voltage

11/03/2013 6:41 AM

Study before it's time for the test!

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Fredski
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#2

Re: no load line voltage

11/03/2013 8:20 AM

here's a hint...if you have a homework question you're too lazy or unable to figure out for yourself and you'd like a freebie from this forum then formulate your question as if you're actually encountering this issue in the field and I'm sure several people here will suggest what measures you need to take to arrive at a solution. but since no one here thinks this is anything but homework, you'll get smart ass responses good luck
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dvmdsc
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#3

Re: No Load Line Voltage

11/03/2013 1:57 PM

Something tells me you think square. 4 phase alternators are not so common. I am still figuring out how to connect that in star. Is it a 4- point star, like 5 point star, minus one?

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Fredski
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#4
In reply to #3

Re: No Load Line Voltage

11/03/2013 2:04 PM

I might be wrong but I took it as "polyphase" who knows?
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khans
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Join Date: Nov 2013
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#8
In reply to #3

Re: No Load Line Voltage

11/04/2013 7:07 AM

i guess ,am not sure ....

temme if there is any formula for no laod line voltage ?
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brich
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#10
In reply to #8

Re: No Load Line Voltage

11/04/2013 6:49 PM

"i guess ,am not sure ...."

about what?.. The question you have asked or the question you were asked? I'm not sure now!!

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lyn
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#11
In reply to #8

Re: No Load Line Voltage

11/04/2013 6:57 PM

Who did your homework for you last week?

Voltage regulation - Wikipedia, the free encyclopedia

Voltage Regulation Formulas and Reactance of Conductors ...
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nitroxpro
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#9
In reply to #3

Re: No Load Line Voltage

11/04/2013 9:03 AM

Point well taken. I think he looked at the star and counted the neutral as a phase. Oy!
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lyn
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#5

Re: No Load Line Voltage

11/03/2013 2:41 PM

kVA Rating Question
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wareagle
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#6

Re: No Load Line Voltage

11/03/2013 7:51 PM

Quote Khans "In a 50 kVA, star connected 440 V, 4-phase 50 Hz alternator"

Maybe he means 4 wire instead of 4-phase.
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PWSlack
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#7
In reply to #6

Re: No Load Line Voltage

11/04/2013 3:35 AM

It is rather difficult to tell which.

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Wal
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#12

Re: No Load Line Voltage

11/04/2013 11:20 PM

Others have already suggested that you mean 4 wire (ie 3P1N) not 4 phase.

50kVA/440V/"3"P/Y sounds like a bog regular genset for say a small office/apartment/hotel/workshop......

so the no load line voltage will be???

....it will be what ever you set the AVR to. This setting should be taking into account any voltage drop of the distribution network you energise with it.

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1capybara
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#13

Re: No Load Line Voltage

11/19/2013 10:44 AM

440v line to line, 254v line-gnd.

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abasins
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#14

Re: No Load Line Voltage

04/18/2014 6:11 AM

I just read the forum after a long absence for two years or so.

In star connection:

1. V (L) = 440 V; V (L) is the line voltage.

2. V (P) = 440 V/1.73 = 254.3 V; V (P) is the phase voltage.

Generally: For 3-phase system V = 400 V and phase Voltage = 230 V

The no-load voltage would appear to be slightly greater than full-load voltage?

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Users who posted comments:

1capybara (1); abasins (1); brich (1); dvmdsc (1); Fredski (2); khans (1); lyn (3); nitroxpro (1); PWSlack (1); Wal (1); wareagle (1)

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