CableDataSheet, Cable and Wire Technical Consulting Service

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What is the adiabatic equation for cables?

When calculating the fault ratings of a cable, it is generally assumed that the duration is short enough that no heat is dissipated by the cable to the surroundings.  Adopting this approach simplifies the calculation and errs on the safe side.

The normally used equation is the so-called adiabatic equation.  For a given fault of I, which lasts for time t, the minimum required cable cross-sectional area is given by:

t = (A^2*k^2)/I^2

where:    A - the nominal cross-section area, mm2
        I - the fault current in, A
        t -  duration of fault current, s
        k - a factor dependant on cable type (see below)

The factor k is dependant on the cable insulation, allowable temperature rise under fault conditions, conductor resistivity and heat capacity.  Typical values of k are:













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Standard covering flexible trailing cables for use in mines and quarries.

BS6708 reference BS6708 Type 7, Type 7M, Type 7S BS6708 Type 11 BS6708 Type 20 BS6708 Type 21 BS6708 Type 62, 63,64 BS6708 Type 201 and Type 211 BS6708 Type 307 (includes 307M and 307S) BS6708 Type 321 and Type 331 BS6708 Type 621 and Type 631 BS6708 Type 506, Type 512, Type 518 & Type 524

Voltage Rating 640/1100V 640/1100V 640/1100V 640/1100V 640/1100V 640/1100V 1.9/3.3kV 1.9/3.3kV 3.8/6.6kV 320/550V

Flexible Trailing Cable Application For use on equipment including excavators, coal-cutters and crushing machines. For use with shuttle cars, coal cutters and at-face equipment For the supply of heavy-duty machinery used for excavating and crushing applications (3 core cables) For the supply of heavy-duty machinery used for excavating and crushing applications (4 core cables) Trailing cable with pliable galvanised steel wire armouring for mine roadway extension cables and mechanically protected cables in quarries and coal face lighting Trailing cable with pliable galvanised steel wire armouring for mine roadway extension cables and mechanically protected cables in quarries and coal face lighting For use on equipment including excavators, coal cutting and crushing machinery Trailing cable with pliable galvanised steel wire armouring for mine roadway extension cables and mechanically protected cables in quarries and coal face lighting Trailing cable with pliable galvanised steel wire armouring for heavy-duty equipment Flexible multicore auxilliary cables with galvanised steel pliable wire armouring to provide remote control circuits and for the interconnection between mechine sections and associated auxilliary equipment

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Znergy Cable ( ARYUV PTY LTD )


About Znergy Cable

Znergy Cable is a global electrical component, electrical cable, solar & renewable energy component manufacturer. It is proudly a part of the Aryam Australia Group. Invested with cutting edge technology, we manufacture Low Voltage to High Voltage and any specialist cables in Mining, Fire, LSZH, Shipping, Instrumentation, Oil & Petro-chemical, Gas, Solar, Undersea submersible and industrial cables. Boasting advanced capabilities in technology, Znergy Cable manufactures cables for nuclear plants, space agency projects and boasts HV capabilities up to 512KV. The plants manufacture cables for many Australian, European and American cable manufactures under an OEM agreement


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What is a trailing or reeling cable?

Trailing and reeling cables are electrical power cables for mobile apparatus, such as large excavators, draglines, stackers and reclaimers. The cable allows the mobile apparatus to move without disconnecting its electric power supply.

A reeling cable is specifically designed to be frequently reeled on and off a cable drum or reeler (e.g. an iron ore rail-mounted reclaimer), whereas a trailing cable is specifically designed to be moved with the mobile apparatus (e.g. a coal mine dragline, mineral sands mobile processing plant).


large excavators



coal mine dragline


stackers



Stacker-Reclaimer



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Epaflex Polyurethanes Spa

Epaflex was established in 1991 as a system house specialised in the production of polyurethane systems for the footwear industry. Over the years, Epaflex's business has expanded further and diversified, first with the second line of products, Thermoplastic polyurethane (TPU) granules and then with the production of Polyureas, Polyaspartates, Prepolymers and spray foams for insulation. Together with Elachem SpA, Epaflex forms part of an industrial group which recently set up a major chemical plant for the production of resins.
All of the polyesters used for Epaflex spray foams are produced by Elachem to permit precise control of the quality of the raw materials and a level of competitiveness to meet the needs of the market.



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