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    MICOM P546:: Two End Line Differential CT Compensation With Two Different CT Ratios

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    srinivas
    This document describes a two-ended line differential protection scheme with different current transformer (CT) ratios at each end. The local end has a 1600/1A CT while the remote end has a 1500/1A CT. Both ends use 1500A as the reference current. The local end CT correction factor is 1 since the CT ratios match. The remote end CT correction factor is 1.07 to compensate for the different 1500/1600 ratio.

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    MICOM P546:: Two End Line Differential CT Compensation With Two Different CT Ratios

    Uploaded by

    srinivas
    38 views1 page
    This document describes a two-ended line differential protection scheme with different current transformer (CT) ratios at each end. The local end has a 1600/1A CT while the remote end has a 1500/1A CT. Both ends use 1500A as the reference current. The local end CT correction factor is 1 since the CT ratios match. The remote end CT correction factor is 1.07 to compensate for the different 1500/1600 ratio.

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    hj

    Original Title

    MICOM P546

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    This document describes a two-ended line differential protection scheme with different current transformer (CT) ratios at each end. The local end has a 1600/1A CT while the remote end has a 1500/1A CT. Both ends use 1500A as the reference current. The local end CT correction factor is 1 since the CT ratios match. The remote end CT correction factor is 1.07 to compensate for the different 1500/1600 ratio.

    Copyright:

    © All Rights Reserved
    Download as DOC, PDF, TXT or read online from Scribd
    Download as doc, pdf, or txt
    38 views1 page

    MICOM P546:: Two End Line Differential CT Compensation With Two Different CT Ratios

    Uploaded by

    srinivas
    This document describes a two-ended line differential protection scheme with different current transformer (CT) ratios at each end. The local end has a 1600/1A CT while the remote end has a 1500/1A CT. Both ends use 1500A as the reference current. The local end CT correction factor is 1 since the CT ratios match. The remote end CT correction factor is 1.07 to compensate for the different 1500/1600 ratio.

    Copyright:

    © All Rights Reserved
    Download as DOC, PDF, TXT or read online from Scribd
    Download as doc, pdf, or txt
    of 1

    MICOM P546:

    LOCAL END REMOTE END


    RED670 RED670 RELAY
    RELAY
    87L
    CTR:
    87L CTR:
    1600/1 A 1500/1A

    VT

    TWO END LINE DIFFERENTIAL CT


    COMPENSATION WITH TWO DIFFERENT CT
    RATIOS

    LOCAL END:

    I BASE(Reference Current) : 1500A(No need to set reference current, CT Primary current whichever is minimum of two ends)

    Phase Is1(Differential Min Pick up): 0.25 p.u.(Primary current considered as 400A)

    Phase CT correction : 1(1600/1600)

    REMOTE END:

    I BASE(Reference Current) : 1500A(No need to set in the relay, CT Primary current whichever is minimum of two ends)

    Id Min(Differential Min Pick up): 0.25 p.u.(Primary current considered as 400A)

    Phase CT correction : 1.07(1600/1500)

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