Archives 2017

Written by on in Strand-Fill in Medium Voltage Tape Shield Cable.

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Strand-fll sometimes called moisture-block is a tar like substance that is applied between each lay-er of a concentric stranded copper or aluminum phase conductor. During the stranding process and at slightly elevated temperatures this tar like substance becomes fuid enough to be forced through a pump and applied geometrically in such a manner that the interstitial space between every strand is flled with the tar. The tar is then allowed to cool whereas it becomes stable and remains in place.

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A dual rated cable is a cable that lists two different voltage ratings on its jacket. For instance, a cable with 115 mils insulation thickness may have a jacket with a print legend that lists both 5kV and 8kV voltages at 133% and 100% insulation levels respectively on it. Therefore, this cable may be used on both 5kV and 8kV systems.

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Written by on in Medium Voltage Cables.

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Southwire is a company with a keen environmental awareness. We seek to leave the lightest footprint possible on the environment in the course of manufacturing and delivering our products to market. To that end Southwire Company has innovated a product that accomplishes one of our environmental objectives – A medium and 600 volt Ethylene Propylene Rubber (EPR) insulation that contains no lead.

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Written by , on in Medium Voltage Cables.

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Background Southwire’s Medium Voltage Switchgear and Substation Cable is a non-shielded, insulated, finely stranded cable that has no voltage rating. The cable has no UL listing and is not recognized by the National Electrical Code (NEC). The cable’s primarily use is for installation in medium voltage switchgear, motor controllers, and substations. In regard to use inside enclosures and equipment, even though this cable itself is not UL listed, a UL approval can be obtained on the complete assembly by having the system tested and approved.

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Written by on in VFD Cable.

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Overview While it is acceptable to terminate the phase conductors of a VFD cable as you would any other industrial power cable, special attention needs to be paid to the termination of the cable shield. The shield is an important part of the VFD cable but if it is not terminated properly, most of the benefits that this shield provides are negated. If you don’t properly terminate a VFD cable’s shield you may as well have not spent the extra money on VFD cable to begin with! Proper shield termination allows the shield to become a low impedance path for high frequency common mode current to flow from the motor back to the inverter. Without this controlled path, these currents can travel through motor bearings and building infrastructure and cause problems with other sensitive equipment like PLCs, control, and communication systems located throughout your facility. There are three main types of shield found in VFD cables and Southwire makes VFD cables with each of these shield types. The shield types are: copper braid shield with aluminum foil (Copper Braid); A helically applied copper tape (Copper Tape); and a continuously corrugated welded aluminum used in MC cables (Aluminum Welded Armor). This application note will detail how to terminate each of these shield types.

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Written by on in VFD Cable.

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A variable-frequency drive (VFD) cable is a special cable construction for the inverter-to-motor cable that has some or all of the following attributes:
• An overall shield that keeps bad stuff such as electrical magnetic interference (EMI) from escaping.
• A robust insulation system that keeps good stuff such as voltage and current from escaping.
• A symmetrical design that reduces the amount of bad stuff in the cable, such as common mode current and EMI.

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