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Transient Thoughts

Improving Lightning Performance of Distribution Lines

March 11, 2017 • ARTICLE ARCHIVE, Transient Thoughts, Utility Practice & ExperienceComments (0)

For years, engineers have accepted the fact that a direct lightning flash to an overhead line will cause flashovers at unprotected insulators. It is therefore desirable to divert lightning flashes to ground using overhead groundwires to protect the insulation on transmission lines. But this is generally not done in the case of distribution lines that ...

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Overcoming Lightning Protection Challenges

February 4, 2017 • ARTICLE ARCHIVE, Editorial Columns, Transient Thoughts, Utility Practice & Experience

One of the ways I excite graduate students about career opportunities in the electrical power industry is a weekly lecture called ‘In the News …’. This year interest has expanded so rapidly in the course Smart Grid Topics that a second section was...

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Shielding Failures & Stroke Flashovers

February 4, 2017 • ARTICLE ARCHIVE, Transient Thoughts

The train ride from Narita Airport to Tokyo offers occasional glimpses of the tall, multi-circuit and multi-voltage transmission lines common throughout Japan. Starting about 2000, local researchers began observing direct lightning flashes on prototype double...

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Superior Power Quality Even Under Lightning

December 3, 2016 • Transient Thoughts

Advances in IEEE Standard 1410/2010 have called for additional insulation strength to withstand induced overvoltages from nearby lightning strikes in areas of high soil resistivity (i.e. 1000 ohm meter). However, large power utilities, such as KEPCO in Korea...

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Conductor Vibration Control When Applying Line Arresters

Conductor Vibration Control When Applying Line Arresters

May 28, 2016 • ARTICLE ARCHIVE, Transient Thoughts

I was recently invited to Tsinghua University in Beijing to give lectures and, while there, I was searching for photos of applications of transmission line arresters in China to support my topic. Then – lo and behold – in my email inbox came the Photo of...

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Shielding Failures & Stroke Flashovers

May 7, 2016 • ARTICLE ARCHIVE, Transient Thoughts

The train ride from Narita Airport to Tokyo offers occasional glimpses of the tall, multi-circuit and multi-voltage transmission lines common throughout Japan. Starting about 2000, local researchers began observing direct lightning flashes on prototype double...

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Lightning Protection for HVDC Lines

Lightning Protection for HVDC Lines

March 26, 2016 • Transient Thoughts

The design of ac overhead lines requires considering many factors, including wind and ice loads, strength of poles and insulator attachment hardware, line voltage and transient over voltage stresses as well as insulator pollution exposure. It is therefore...

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End-of-Life of Overhead Groundwires

End-of-Life of Overhead Groundwires

March 29, 2015 • ARTICLE ARCHIVE, Editorial Columns, Transient Thoughts

It’s not unusual these days for utility asset engineers to manage ‘fleets’ of overhead lines, some constructed in the 1950s and now more than 50 years old. This time span is actually the center of the age range where overhead groundwires (OHGW) begin to...

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