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amolkarne
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Join Date: Jul 2009
Location: Pune, India
Posts: 15

voltage

01/30/2010 9:51 AM

why we get 1phase vtg 230v & 3phase 415v????????
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Anonymous Poster
#1

Re: voltage

01/30/2010 1:38 PM

If phase to neutral is V then what is the Phase to Phase in a 3 phase system?
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amolkarne
Active Contributor

Join Date: Jul 2009
Location: Pune, India
Posts: 15
#4
In reply to #1

Re: voltage

02/04/2010 9:51 AM

ITS

ROOT3 X V
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Alexander M. Berlin
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Join Date: Jan 2010
Posts: 70
Good Answers: 4
#2

Re: voltage

01/30/2010 2:35 PM

The neutral point in a three phase system exists at the mathematical center of an equilateral triangle formed by the three phase points, and the phase-to-phase voltage is accordingly the square root of 3, times the phase-to-neutral voltage. The sq root of 3 = 1.732 Therefore 415 / 1.732 = 239 volts (nominal) Hope this helps...
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vishram lele
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India - Member - New Member Engineering Fields - Electrical Engineering - New Member Technical Fields - Technical Writing - New Member

Join Date: Dec 2009
Location: India
Posts: 68
Good Answers: 4
#3
In reply to #2

Re: voltage

01/31/2010 12:50 AM

There are 2 Most commonly used connection type of 3 Phase AC System -

1. STAR Connections

2. DELTA Connections.

In STAR Connections you have Phase Voltages as well as the Line Voltages.

Phase voltage is the voltage between Any of the Phase with the Neutral Point & the Line voltage is the Voltage across the Two Phases.

The Equotation of relation between Phase Voltage & Line Voltages would be -

Voltage Line = Sqrt 3 x Phase Voltage

In Case of DELTA Connection you do not have the Neutral Point, Hence the Phase Voltages = Line Voltage.

Normally in the Utility Distrubution Sites the Distribution Transformers are Delta / Star Connected, Where in Secondary is Star Connected. Hence the above STAR Combination is available at all locations..
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Alexander M. Berlin (1); amolkarne (1); Anonymous Poster (1); vishram lele (1)

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