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    Tech Article - Copper Braided Flexibles

    Uploaded by

    Sandeep Nair
    The document discusses copper braided flexibles, which are flexible connectors used to transmit current across moving parts in electrical equipment. They provide maximum conductivity and minimum resistance even with small movements. Copper braided flexibles are recommended for connecting busbar trunking systems to transformers, panels, generators, or end feed units, as they can flexibly terminate even if the location of the connected equipment varies slightly. Copper braid is made by weaving copper wire strands together, and flexibility increases with smaller wire gauges. It provides advantages like absorbing vibrations, allowing for natural expansion/compression of wires, and minimizing resistance and voltage drop.

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    Tech Article - Copper Braided Flexibles

    Uploaded by

    Sandeep Nair
    64 views3 pages
    The document discusses copper braided flexibles, which are flexible connectors used to transmit current across moving parts in electrical equipment. They provide maximum conductivity and minimum resistance even with small movements. Copper braided flexibles are recommended for connecting busbar trunking systems to transformers, panels, generators, or end feed units, as they can flexibly terminate even if the location of the connected equipment varies slightly. Copper braid is made by weaving copper wire strands together, and flexibility increases with smaller wire gauges. It provides advantages like absorbing vibrations, allowing for natural expansion/compression of wires, and minimizing resistance and voltage drop.

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    Tech Article_Copper Braided Flexibles

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    The document discusses copper braided flexibles, which are flexible connectors used to transmit current across moving parts in electrical equipment. They provide maximum conductivity and minimum resistance even with small movements. Copper braided flexibles are recommended for connecting busbar trunking systems to transformers, panels, generators, or end feed units, as they can flexibly terminate even if the location of the connected equipment varies slightly. Copper braid is made by weaving copper wire strands together, and flexibility increases with smaller wire gauges. It provides advantages like absorbing vibrations, allowing for natural expansion/compression of wires, and minimizing resistance and voltage drop.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    64 views3 pages

    Tech Article - Copper Braided Flexibles

    Uploaded by

    Sandeep Nair
    The document discusses copper braided flexibles, which are flexible connectors used to transmit current across moving parts in electrical equipment. They provide maximum conductivity and minimum resistance even with small movements. Copper braided flexibles are recommended for connecting busbar trunking systems to transformers, panels, generators, or end feed units, as they can flexibly terminate even if the location of the connected equipment varies slightly. Copper braid is made by weaving copper wire strands together, and flexibility increases with smaller wire gauges. It provides advantages like absorbing vibrations, allowing for natural expansion/compression of wires, and minimizing resistance and voltage drop.

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    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
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    of 3

    Application Note

    BBT/PMM/AN2/27.09.2017

    Copper Braided Flexibles

    Flexible connectors are used in transmitting current across conducting mediums which are
    subjected to different motions caused by operational movement, thermal expansion or vibration,
    etc. These flexible connectors are widely used in electrical and other industries for termination of
    electrical equipment’s which provides maximum conductivity and minimum millivolt drop and
    maintains excellent flexibility.

    In Electrical equipment’s layout, possibility of small variation in location is always there. Copper
    Flexibles are feasible in such cases and allows termination because of its flexibility.

    The numerous smaller wires comprising the braid


    are much more resistant to breaking under repeated
    motion and vibration than a cable of larger wires. In
    electrical and electronic cables, braid is a tubular
    sheath made of braided strands of metal placed
    around a central cable for shielding against
    electromagnetic interference

    Copper, which has chemical symbol as Cu and


    atomic weight 29, is the most widely used electrical
    industries.

    Flexibles for BBT termination:


    For Sandwich Busbar Trunking System connections with Transformer or Panel or DG or End Feed
    Unit; Copper Braided Flexibles are recommended, because it has advantages as mentioned
    above.
    Braided Flexibles get terminated properly even if there is small variation in location of any electrical
    equipment (i.e. Transformer or Panel or DG or End Feed Unit)

    Design:

    Copper braid is manufactured by weaving strands of copper wire together. The flexibility of the
    braid is determined by the diameter of the copper wire. The smaller the wire the greater the
    flexibility and the larger the volume occupied by the braid and the more expensive the braid

    (1)
    Application Note
    BBT/PMM/AN2/27.09.2017

    becomes (e.g. 42SWG wire have more flexibility than 38SWG wire and more expensive too).
    Flexibility is also determined by the type of weave.

    Application:

    The main purpose of braided flexible connectors is to deliver maximum power output, even during
    peak performance. In those sectors, where the demand of power is much, and the wires experience
    considerable load, then braided flexible connectors can be an efficient solution for optimal power
    output.

    Advantages:
    Some of the advantages of using braided flexible connectors are:
    • Control and absorb the vibrations
    • Manage the natural expansion and compression of wires during power transmission
    • Provide minimum resistance
    • Minimum millivolt drop
    • Excellent Flexibility

    Cross section area of a braid:


    Cross section of a braid wire is calculated as follows:
    ܰ‫ ݀ × ݏܰ × ܽܰ × ݌‬ଶ × 3.142
    ‫ ݏݏ݋ݎܥ‬sec. ܽ‫= ܽ݁ݎ‬
    4
    Where:
    Np = No. of primary bunches
    Na = No. of Auxiliary bunches
    Ns = No. of strands per aux. bunch
    d = Strand diameter

    Note:
    Meaning of Strand is Copper Wire.
    Auxiliary bunch means the bunch of strands (copper wire)
    Primary bunch means the bunch of Auxiliary bunch

    (2)
    Application Note
    BBT/PMM/AN2/27.09.2017

    Selection of braid:
    Following table from IEC-61439 Part-1 standard displays the maximum recommended / permitted
    current rating for respective cross section area of braid.

    Table 1. Cross-section of copper conductors suitable for connection to terminals for external conductors

    Busduct termination using Copper Flexibles:

    (3)

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