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    Bundled

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    AparnaHaridev
    Bundled conductors are used for three-phase high voltage power lines to reduce corona. Corona occurs when the electric field strength near the conductor exceeds the breakdown strength of air, causing power loss and interference. Bundling two or more conductors per phase close together reduces the high voltage surface gradient. The conductors are spaced regularly with dampers to prevent clashing and swaying. Bundling lowers the inductance compared to a single conductor and is commonly used for 220kV and 400kV power lines in India.

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    Bundled

    Uploaded by

    AparnaHaridev
    15 views2 pages
    Bundled conductors are used for three-phase high voltage power lines to reduce corona. Corona occurs when the electric field strength near the conductor exceeds the breakdown strength of air, causing power loss and interference. Bundling two or more conductors per phase close together reduces the high voltage surface gradient. The conductors are spaced regularly with dampers to prevent clashing and swaying. Bundling lowers the inductance compared to a single conductor and is commonly used for 220kV and 400kV power lines in India.

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    conductors

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    Bundled conductors are used for three-phase high voltage power lines to reduce corona. Corona occurs when the electric field strength near the conductor exceeds the breakdown strength of air, causing power loss and interference. Bundling two or more conductors per phase close together reduces the high voltage surface gradient. The conductors are spaced regularly with dampers to prevent clashing and swaying. Bundling lowers the inductance compared to a single conductor and is commonly used for 220kV and 400kV power lines in India.

    Copyright:

    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    15 views2 pages

    Bundled

    Uploaded by

    AparnaHaridev
    Bundled conductors are used for three-phase high voltage power lines to reduce corona. Corona occurs when the electric field strength near the conductor exceeds the breakdown strength of air, causing power loss and interference. Bundling two or more conductors per phase close together reduces the high voltage surface gradient. The conductors are spaced regularly with dampers to prevent clashing and swaying. Bundling lowers the inductance compared to a single conductor and is commonly used for 220kV and 400kV power lines in India.

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    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
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    Bundled Conductors

    So far we have discussed three-phase systems that have only one conductor per phase. However for
    extra high voltage lines corona causes a large problem if the conductor has only one conductor per
    phase. Corona occurs when the surface potential gradient of a conductor exceeds the dielectric strength
    of the surrounding air. This causes ionization of the area near the conductor. Corona produces power
    loss. It also causes interference with communication channels. Corona manifests itself with a hissing
    sound and ozone discharge. Since most long distance power lines in India are either 220 kV or 400 kV,
    avoidance of the occurrence of corona is desirable.
    The high voltage surface gradient is reduced considerably by having two or more conductors per phase in
    close proximity. This is called conductor bundling . The conductors are bundled in groups of two, three or
    four as shown in Fig. 1.10. The conductors of a bundle are separated at regular intervals with spacer
    dampers that prevent clashing of the conductors and prevent them from swaying in the wind. They also
    connect the conductors in parallel.
    The geometric mean radius (GMR) of two-conductor bundle is given by

    where D
    s
    is the GMR of conductor. The GMR for three-conductor and four-conductor bundles are given
    respectively by



    The inductance of the bundled conductor is then given by



    (1.53)

    (1.54)

    (1.55)
    where n=2,3 ....
    (1.56)
    where the geometric mean distance is calculated assuming that the center of a round conductor is the
    same as that of the center of the bundle.

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