Featured Content

• 

  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 >

• 

  Optimizing Structure Design Using Transmission Line Surge Arresters

  in Arresters

  A lower switching surge overvoltage can lead to more compact tower top geometry, which in turn can reduce total project costs as well as overall environmental impact. Read More >

• 

  Impact & Mitigation of Icing on Power Network Equipment

  in Utility Practice & Experience

  The disruptive effects of icing on power systems result from excessive ice or snow accumulation, combined with wind forces, as well as subsequent jumping of cables and conductors following sudden ice shedding. Read More >

• 

  Corona’s Threat to Polymeric Insulation

  in All Articles, Corona, Insulators

  Polymeric materials are more susceptible to degradation from UV produced by corona than from solar radiation, particularly if the corona takes place close to the material. Read More >

• 

  Partial Discharge & Commissioning Testing of Long (+20 km) 400 kV XLPE Cables

  in HV/HP Testing

  For on-site testing of HV cable systems, overvoltage tests above nominal voltage phase-to-ground (U0) in combination with PD testing is now state-of-the-art and both IEC and CIGRE state requirements in regard to voltage levels and setup of PD measurement equipment. Read More >

• 

  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 >

• 

  Surge Arrester Stresses Due to Harmonic Resonance Temporary Overvoltages in Transmission Systems

  in Arresters

  Much higher capacitances of cables lead to changes in the harmonic impedance profile of the transmission system at and close to the point(s) of connection. Read More >

• 

  Interchanging Traditional MV Porcelain Bushings with Composite Polymeric Types

  in Bushings

  Replacement or retrofit of medium voltage bushings is common practice after decades operating a power transformer. Read More >

• 

  Understanding Energy Rating of Distribution Arresters

  in Arresters, Editorial Columns, Woodworth on Arresters

  Read More >