MENU

Innovations in Type & Commissioning Testing of High Voltage Cables

July 1, 2017 • ARTICLE ARCHIVE, Testing, Utility Practice & Experience Comments (0)

Over the past two decades, the use of extruded XLPE cables in underground transmission systems has increased steadily to the point that they now account for the vast majority of all new installations. This near total shift away from oil and paper insulation has made it worthwhile to look for improved methodologies for testing solid ...

Read More
ADVERTISEMENT
inmr adv CTC

Past Experience at Canadian Utility with Surge Arresters on Transmission Lines

July 22, 2017 • Arresters, ARTICLE ARCHIVE, Utility Practice & Experience Comments (0)

This past INMR article contributed by John Williamson, former Manager of Transmission Engineering at NB Power, described the experience at a Canadian utility regarding application of surge arresters on 69 kV and 138 kV transmission lines over a 6-year period....

Forensic Analysis of Failed Surge Arresters

Forensic Analysis of Failed Surge Arresters

July 8, 2017 • Arresters, ARTICLE ARCHIVE, Article of the week Comments (0)

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)...

Switching & Lightning Protection Using Externally Gapped Line Arresters

July 15, 2017 • Arresters, ARTICLE ARCHIVE Comments (0)

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...

Application of Composite Interphase Spacers to Prevent Conductor Galloping

July 1, 2017 • ARTICLE ARCHIVE, Utility Practice & Experience Comments (0)

The use of composite insulators on transmission lines has increased steadily due to their well-known performance advantages as well as lower acquisition and life cycle costs. At the same time, these insulators have offered solutions in other areas where...

Expanding Test Criteria to Ensure Quality of Glass Insulators

July 29, 2017 • ARTICLE ARCHIVE, glass, HV/HP Testing Comments (0)

Toughened glass has been increasing its share of the total insulator business through growing application of glass strings on overhead lines. At the same time, there has been increased ‘turbulence’ in this market sector. Competition has intensified with...

Coating Glass Insulators for Service in Severe Environments

July 1, 2017 • ARTICLE ARCHIVE, glass, Insulators Comments (0)

RTV silicone material has been used to prevent pollution flashovers at substations for more than 30 years. More recently, this same remedial measure has also been adopted by power utilities worldwide to resolve service problems due to extreme contamination...

Performance & Ageing of Semi-Conducting Glaze Porcelain Insulators

Performance & Ageing of Semi-Conducting Glaze Porcelain Insulators

July 1, 2017 • ARTICLE ARCHIVE, HV/HP Testing, Insulators Comments (0)

Although porcelain insulators have been used widely at all voltage levels for many years now, they have not performed entirely without problems. These typically tend to occur when pollution and moisture combine to form a highly-conductive layer on their...

Resolving External Insulation Problems at HVDC Converter Stations

Resolving External Insulation Problems at HVDC Converter Stations

July 29, 2017 • ARTICLE ARCHIVE, Insulators Comments (0)

Along with China’s rapid economic growth over the past three decades has come a major revamping of that country’s energy and load planning strategies. In particular, DC transmission has begun to take on an increasingly important role since 1990 due to its...

Design of Insulator Strings for 600 kV DC Lines in Harsh Desert Environment

July 8, 2017 • ARTICLE ARCHIVE, Utility Practice & Experience Comments (0)

A bulk power HVDC link between the Central and West Saudi power grids has been designed and is under construction. The purpose of the link is to provide economic dispatch for the generating units, flexibility to share capacity under normal conditions and...

INMR advertisers include: