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Arresters

Application of Station Class Arresters on Underbuilt Distribution Lines

February 17, 2018 • Arresters, ARTICLE ARCHIVEComments (0)

Current protection systems for distribution networks are typically designed to handle fast-impulse overvoltages, such as from switching and lightning, but not power frequency overvoltages that are relatively long duration. For example, should contact occur between a transmission and a distribution line or between distribution lines having different...

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Mitigating Lead Stresses on Line Arresters

February 10, 2018 • Arresters, ARTICLE ARCHIVE

Transmission line surge arresters (TLSAs) are applied on overhead lines to improve outage performance and, particularly in the case of EHV, also to limit the magnitude of switching overvoltages. There are two basic types: externally gapped line arresters...

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Principal Failure Modes for Surge Arresters

Principal Failure Modes for Surge Arresters

February 10, 2018 • Arresters, ARTICLE ARCHIVE

The failure of an arrester almost always results in a complete short circuit inside its housing. In most scenarios, failure occurs due to dielectric breakdown, whereby the internal structure has deteriorated to the point where the arrester is unable to...

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Technology & Application Review of Arresters that Extend Life of Cables

February 3, 2018 • Arresters, ARTICLE ARCHIVE

There are basically three types of arresters used to protect high voltage power cables. The first, known by two names – deadfront (IEEE) or separable (IEC) arresters – is used primarily on distribution systems and often found in pad-mounted cabinets. The...

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Forensic Analysis of Failed Surge Arresters

Forensic Analysis of Failed Surge Arresters

February 3, 2018 • Arresters, ARTICLE ARCHIVE

Arresters are essentially devices to divert lightning and switching surges and can sometimes become overloaded to the point of failure. Whenever this occurs, it’s extremely useful to properly determine the reason why the arrester (or companion arresters)...

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Achieving Long Service Life from Transmission Line Arresters

January 27, 2018 • Arresters, ARTICLE ARCHIVE

Many transmission line surge arresters (TLSA) have been suspended from phase conductors, adding mass that creates a new mechanical node between insulator suspension clamps and Aeolian vibration dampers. This placement interferes with damper performance and...

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Lightning Performance of Distribution Lines

January 20, 2018 • Arresters, ARTICLE ARCHIVE, Woodworth on Arresters

The most recent edition of IEEE Technical Guide 1410 on how to improve lightning performance of distribution lines was issued in 2010 when many improvements were added. Because the experts involved had deep roots in the world of lightning and system transient...

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Utility Implemented Program to Monitor Condition of Station Arresters

December 9, 2017 • Arresters, ARTICLE ARCHIVE, Utility Practice & Experience

To protect expensive assets at its substations, Elektroprenos BiH – the company operating the power system in Bosnia and Herzegovina – began installing metal oxide (MO) surge arresters in each of its HV transformer bays about 20 years ago. Over the years...

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