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  Principal Failure Modes for Surge Arresters

  in Arresters

  Failure of surge arresters typically occurs due to dielectric breakdown, whereby the internal structure has deteriorated to the point where the arrester is unable to withstand applied voltage, whether normal system voltage, temporary power frequency overvoltage or lightning or switching surge overvoltages. Read More >

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  Birds: Threat to Lines & Threatened by Lines

  in Wildlife Protection

  Birds and power lines co-exist in what is a close but mutually threatening relationship. Read More >

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  Bushings Technology Review

  in Bushings

  Bushings must provide reliable electrical insulation both internally (against breakdown) and externally (against flashover) of the conductor exposed to the rated voltage and to periodic service overvoltages – even under contaminated conditions. Read More >

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  When to Remove an Arrester from Service

  in Arresters

  Deciding ‘end of life’ of an arrester can prove highly subjective since this component can survive for long periods with no obvious loss of function. Read More >

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  Applying Surge Arresters to Mitigate Breaker Transient Recovery Voltage

  in Arresters

  The most severe Transient Recovery Voltage 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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  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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  Protección de pararrayos de circuitos de voltaje más bajo en torres de múltiples voltajes

  in INMR Español, Mantenimiento, Pararrayos

  Read More >

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  Looking Back on the Great Ice Storm of 1998

  in Utility Practice & Experience

  It was what could justifiably be called “an electric utility’s worst nightmare”. Read More >

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  Best Practice in Lightning Protection for Distribution Systems

  in Arresters, Woodworth on Arresters

  As demand for reliable power continues to grow worldwide, improving the lightning reliability of distribution systems becomes more and more common. Read More >