Insulators
Applying Composite Line Insulators Under Natural Pollution
Failures of transmission line insulators due to natural pollution are often associated with changes in service environment or with incorrect parameters when specifying insulation during project design. Such outages normally occur when water on an insulator dissolves but in insufficient quantity to remove salt and other conductive contaminants that have...
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Assessing EHV & UHV Station Post Insulators
Developments in station post insulator technologies can help minimize arcing distances needed at busbars, disconnectors and similar apparatus and therefore contribute to more flexible substation design. In general, station posts can be optimized by using... Read More
Optimal Dimensioning of Grading Rings for Composite Insulators
One of the most important parameters for composite insulators is hydrophobicity, allowing superior insulation performance compared to ceramic cap & pin strings. However, these initial hydrophobic properties can deteriorate in service if there is... Read More
Insulator Failures from Improper Selection
At a past CIGRE meeting in Paris and in particular during the Study Committee B2 session on Overhead Lines, there was much discussion on the still debated issue of the ‘stateof- the-art’ of composite insulator technology. A spectrum of contradictory case... Read More
Key Issues for Future of Composite Insulators: View from China
Application of silicone rubber composite insulators has increased significantly over the past 30 years and among the essential factors behind continued growth is the confidence shown in them by power utilities. This edited article, contributed to INMR by... Read More
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
