Featured Content

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  Applying Surge Arresters to Mitigate Breaker Transient Recovery Voltage

  in Arresters

  The most severe TRV from an amplitude point of view follows interruption of the first phase to clear an ungrounded three-phase fault. Read More >

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  Innovative Porcelain Long Rods for HVDC Overhead Lines

  in Insulators

  Electrical performance of PLRIs without an RTV coating is the same as or better than that of disc type insulators, assuming housing profile has been selected correctly. Read More >

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  Protección de las subestaciones contra el sobrevoltaje

  in INMR Español, Pararrayos

  Si bien la protección de las subestaciones contra rayos y sobretensiones que provocan descargas eléctricas en el aislamiento ha sido una cuestión clave desde que existen los sistemas eléctricos, las opciones sobre la mejor manera de mitigar las tensiones de alto voltaje han cambiado sustancialmente. Read More >

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  Simplified Models of Lightning & Grounding Issues (Part 1 & Part 2)

  in Arresters

  The decision to apply line surge arresters (LSAs) in difficult terrain is informed by estimates of local ground flash density and the ‘critical currents’ that cause flashovers. Read More >

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  Applying Sheath Voltage Limiters to Protect HV Power Cables

  in Arresters, Cables & Accessories, Utility Practice & Experience

  If segmentation is used to interrupt induced sheath current, measures must be taken to limit voltage induced on the sheath during transient events. Read More >

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  Manufacturing Composite Line Insulators

  in Insulators

  Manufacturing composite line insulators is mainly a machine driven process where key factors include quality of equipment, molds and sub-components, which include the FRP core rod, the polymeric housing material and the metal end fittings. Read More >

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  Chemistry & Properties of Silicones

  in Silicone & Other Materials

  Unlike other polymeric materials used in T&D applications, silicones are not made up of a carbon to carbon backbone. Read More >

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  Specifying IEC Certified Arresters

  in Arresters

  Purchasing specifications for surge arresters are typically comprehensive but sometimes request information that is no longer necessary when it comes to MOV type units. Read More >

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  Understanding Arrester VI Characteristic Curves

  in Arresters

  Read More >