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Arresters

Achieving Long Service Life from Transmission Line Arresters

December 1, 2018 • Arresters, ARTICLE ARCHIVEComments Off on Achieving Long Service Life from Transmission Line Arresters

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 could shorten conductor service life. Mitigations include re-positioning dampers, inspecting more...

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Understanding Energy Rating of Distribution Arresters

December 1, 2018 • Arresters, ARTICLE ARCHIVE, Editorial Columns, Woodworth on Arresters

“What is the kJ/kV Uc rating of a Class 1, 10 kA arrester? This type of question has often been asked when it comes to distribution arresters. Yet finding an answer was never easy since these arresters (formerly referred to as Class 1) never had energy... Read More

Bosnian Utility Implemented Program to Monitor Condition of Station Arresters

November 10, 2018 • 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... Read More

Selecting Ratings for IEC Distribution Arresters

November 9, 2018 • Arresters, ARTICLE ARCHIVE

This article, contributed by arrester expert and co-Convener of TC37 MT4, Jon Woodworth, reviews what users can expect to find in IEC 60099-5 once this revised standard is published in several years time. Key elements of the updated standard are identified... Read More

Switching & Lightning Protection Using Externally Gapped Line Arresters

November 3, 2018 • Arresters, ARTICLE ARCHIVE

The goal of a lightning proof transmission line has been attainable since the early 1990s when the first polymeric-housed transmission line arresters became available. Indeed, based on IEEE 1410 and IEEE 1243, installation of arresters on every phase of every... Read More

Principal Failure Modes for Surge Arresters

October 27, 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... Read More

Figure 6: Non-gapped line arrester (NGLA). CLICK TO ENLARGE

Considerations in Arrester Lead Design & Application

October 20, 2018 • Arresters, ARTICLE ARCHIVE

Once a decision is made to install a surge arrester of any particular type, the various design details that follow can prove challenging – as for example when it comes to ideal mounting arrangement or how best to deal with various line and earth lead... Read More

Quality of Metal Oxide Disks Impacts Surge Arrester Performance

October 20, 2018 • Arresters, ARTICLE ARCHIVE

While external design is essential to how reliably a surge arrester performs in service, its electrical characteristics depend largely on the properties of the internal metal oxide resistors. These ceramic disks are sophisticated electronic devices... Read More

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