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Impact of Icing on Transmission Lines

September 23, 2017 • ARTICLE ARCHIVE, Scene from ChinaComments Off on Impact of Icing on Transmission Lines

Icing problems can have a severe impact on the safe operation of overhead transmission lines. Early in 2008, for example, extensive icing hit large areas of southern China. The rare but disastrous meteorological conditions led to outages on 119 lines at 500 kV, 348 lines at 220 kV and 888 lines at 110 kV. Moreover, ...

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Using Less Creepage for Silicone Insulators

July 8, 2017 • ARTICLE ARCHIVE, Insulators, Scene from China

Composite insulators are today quite widely used and well-accepted throughout the world. In China, for example, there several million such insulators already in service on HV transmission lines up to 1000 kV AC and ± 800 kV DC. In addition, huge numbers of...

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Shed Profiles for Composite Insulators

June 17, 2017 • ARTICLE ARCHIVE, Insulators, Scene from China

Finding the ideal profiles for porcelain and glass suspension insulators has proven a relatively complex process with a succession of different designs introduced over the past 100 years. All were aimed at achieving superior pollution flashover performance...

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Impact of Lightning on Transmission Lines

June 10, 2017 • ARTICLE ARCHIVE, Scene from China, Transmission Lines

In places such as China, lightning accounts for about 60% of all transmission line tripping and is closely linked to season as well as region. Based on physical processes, lightning overvoltages fall into two broad categories: • those caused by direct...

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Monitoring Leakage Current to Evaluate Insulator Pollution

September 17, 2016 • ARTICLE ARCHIVE, Editorial Columns, Scene from China

Leakage currents flow across the surface of polluted insulators under wet atmospheric conditions and link closely to resulting discharge phenomena. They have a range of characteristics that include maximum amplitude, number of pulses that exceed certain...

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Characterizing Pollution Severity Needs More than Simply Relying on ESDD

Characterizing Pollution Severity Needs More than Simply Relying on ESDD

August 6, 2016 • ARTICLE ARCHIVE, Scene from China

Properly characterizing and measuring the pollution affecting overhead lines and substations is of great importance when specifying insulators to minimize risk of pollution flashover. While there are several relevant parameters to assess pollution severity,...

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Application of & Experience with Different Insulators in China

May 14, 2016 • ARTICLE ARCHIVE, Scene from China

A report from 2012 provided interesting data on the different types of insulators in service on Chinese transmission lines and made fascinating reading. The populations of porcelain and composite insulators at the time were almost equal while glass occupied a...

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Wildfire Hazard to Transmission Lines

April 16, 2016 • ARTICLE ARCHIVE, Scene from China

HV transmission lines inevitably pass through mountainous areas where forest and brush fires are a constant threat. This has made wildfires an important factor in line trips and outages. Occurrence of wildfires is both regional and seasonal. During dry...

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