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Insulator Dimensioning for AC to DC Line Conversion

Increasing market integration between countries and introduction of renewable energy sources on a larger scale has resulted in a growing demand for enhanced capacity in transmission systems. As a consequence, several utilities in Europe and elsewhere have... Read More

Pollution & Ageing Performance of Composite DC Line Insulators: Service & Test Experience

About 20 million composite line insulators are already in service on HVAC overhead lines all over the world. Moreover, the growth in market penetration of this technology seems exponential. The first installations were in Germany in 1967, predominantly in... Read More

Design & Installation of Composite Insulators for New ±525 kV DC Line

Statnett, the TSO in Norway, has reinforced the electrical transmission grid in the country’s southwest due to a new HVDC submarine cable connection to Germany. The project consisted of 250 km of new transmission lines, voltage upgrading of 60 km of... Read More

Renewables, Smart Grids & Insulators

There is a relationship between trendy terms such as ‘renewables’ as well as ‘smart grids’ and electrical insulators, which most people view as just another piece of hardware in a power system. In the interests of protecting the environment and... Read More

Transmission Utility Re-Designed Insulator Strings to Upgrade Thermal Rating of Lines

A decade ago, CEPS, the Transmission System Operator in the Czech Republic, faced the need to increase the longitudinal profiles of several overhead transmission lines. The goal was to increase phase-to-earth clearances at critical locations with the ultimate... Read More

Biological Growths on Composite Insulators

Composite insulators have become common on overhead lines as well as at substations due to application advantages and their attractive acquisition costs. However, the nature of polymeric housing materials is that premature ageing can be a problem if... Read More

Insulators for DC Line Applications

When it comes to DC line applications, there are ‘pure’ DC connections and also ‘hybrid’ connections – the latter being a solution to replace an AC system on an existing line route with a DC bi-pole to increase transmission capacity. While it is now... Read More