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  Surge Protection of Substations

  in Utility Practice & Experience

  Protecting substations from lightning and switching surges that lead to insulation flashover has been a key issue for as long as there have been power systems. Read More >

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  Test Requirements for HV Bushings

  in Bushings, HV/HP Testing

  Cost of bushings on a HV power transformer generally accounts for 5 to 8% of total installed cost but bushing failure can prove catastrophic and result in loss of costly assets with potentially long replacement lead times. Read More >

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  Testing 320 kV HVDC XLPE Cable

  in Cables & Accessories, HV/HP Testing

  Field distribution in an HVDC cable is determined by resistivity of the insulation material, which varies greatly with temperature. Read More >

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  Self-Cleaning Properties of Super-Hydrophobic Silicone for High Voltage Insulators

  in Insulators

  High temperature vulcanized silicone high voltage insulators are known for exceptional hydrophobic properties such that water droplets stand separately over the surface and do not form a continuous film. Read More >

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  Managing Bird Damage to Utility Structures

  in Utility Practice & Experience

  There are several theories as to why these birds find utility poles attractive, but most conclude that these present a convenient vantage point for announcing territory and detecting predators. Read More >

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  Safety Testing of HV Cable Terminations, Bushings & Arresters

  in Arresters, Bushings, Cables & Accessories, HV/HP Testing

  While cases of catastrophic failure are rare, they serve as constant reminders of the explosion risks whenever electrical arcing occurs inside a porcelain-housed component filled with oil or pressurized gas. Read More >

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  Biological Growths on Composite Insulators

  in Insulators

  The nature of polymeric housing materials is that premature ageing can be a problem if insulators are incorrectly selected or not properly designed and manufactured. Read More >

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  Dielectric Frequency Response to Diagnose Condition of Bushings

  in Bushings, Maintenance

  It is important that all maintenance programs include bushing condition assessment since a problem with even a single bushing can prevent a transformer/reactor from returning to service. Read More >

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  Understanding Arrester VI Characteristic Curves

  in Arresters

  Read More >