Very quick question PLEASE - Star Connection

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Discussion Overview

The discussion revolves around the concept of star connections in power engineering, specifically focusing on the relationship between phase voltage and line voltage in a three-phase system. Participants seek clarification on the interpretation of voltage values in the context of a star-connected load.

Discussion Character

  • Homework-related
  • Technical explanation

Main Points Raised

  • One participant questions whether the 220V mentioned refers to the phase voltage or the line voltage in a star connection.
  • Another participant asserts that since the voltage sources are specified as 220V and the connection is star, the 220V refers to the phase voltage, leading to a line voltage of 220√3.
  • A participant inquires about the scenario if the sources were switched to a delta connection, asking if the line voltage would then be 220V, noting that phase voltage equals line voltage in delta connections.
  • A later reply confirms that in a delta connection, the line voltage would indeed be 220V.

Areas of Agreement / Disagreement

Participants generally agree on the interpretation of the voltage in a star connection, but there is a question regarding the implications of switching to a delta connection, which remains a point of inquiry.

Contextual Notes

The discussion does not resolve the implications of switching from star to delta connections in terms of voltage relationships, and assumptions about the definitions of line and phase voltages are not fully explored.

tissue98
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Very quick question PLEASE - Star Connection!

Homework Statement



i'm just working on some questions on power engineering and there's a question on star connections. the wording is a bit funny - wondering if can get some clarification please.

"a three phase load is composed of three impedances of 10+5j. it is connected to a supply composed of three voltage sources of 220V. The three sources and three impedances are connected in star"

i am then asked to state the magnitude of the line voltage. I am confused about the wording - does it mean that the phase voltage is 220V (if there were three separate sources, this would be the case) or that the line voltage is 220V?

thanks for your help



Homework Equations





The Attempt at a Solution



i thought that the phase voltage would be 220 and so line voltage 220root3. is this correct?
 
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since it specifically says that the voltage sources on the supply end are 220V and since it is star connected, the 220v refers to phase voltage. LL voltage would be 220root(3) as you thought.
 


if the sources are switched to delta, would the line voltage be 220?

since phase voltage = line voltage for delta connectio
 


tissue98 said:
if the sources are switched to delta, would the line voltage be 220?

since phase voltage = line voltage for delta connectio

yes.
 

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