What is line voltage and what is phase voltage?

Forums Common electrical queries What is line voltage and what is phase voltage?

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This topic contains 3 replies, has 3 voices, and was last updated by Profile photo of imran ahmed imran ahmed 2 years, 9 months ago.

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  • #261
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    imran ahmed
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    I’m in little confusion about line voltage and phase voltage?
    What is meant by phase voltage? Is the voltage between 2 phases or a phase and a neutral?
    What is the difference between line voltage and phase voltage?

    #263
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    Dnyanesh
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    @imran, Line voltage  is the voltage between any two phases in polyphase system. While Phase voltage is the voltage between any one phase and neutral. 

    In star system,

    E(line) =√3 E(phase)

    I(line) =I(phase)

    In delta system their is no neutral hence,

    E(line)= E(phase)

    I(line) = √3 I(phase)

    #264
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    Kiran Daware
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    When we measure voltages (or currents) in a three phase system, it becomes important to specify between which points we are taking the measurements. Thus, the terms line voltage (or current) and phase voltage (or current) arise.

    Line voltage: It is the voltage measured between any two conductors (or phases) in a three phase system.

    Phase voltage: It is the voltage measured between a conductor (or phase) and neutral.

    Relation between line voltage and phase voltage:

    In delta connection: Line voltage = Phase voltage

    In star connection: Line voltage = √3 * Phase voltage

    #269
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    imran ahmed
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    Thank you Dnyanesh and kiran…:)

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