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The first inquiry for new tower designs was launched by Elia (the Belgian TSO) in 2008 in the frame of the need for new 380 kV transmission lines. The requirements of this inquiry included minimum visual effects (similar to the existing 150 kV tower silhouette), low EMF and AN levels under the line and a maximum transport capacity of 3 GVA/circuit. Based on these requirements the innovative compact...
There is an exponential growth in application of composite insulators during the last decade(s). They are especially popular for overhead line refurbishment and compact lines and these applications require higher demands on electric field grading. Two main criteria are used for the dimensioning of grading rings for composite insulators, the first one for the metal parts and the second for the housing...
In the past superior pollution performance was the main driving force for composite insulator application, and therefore their use in polluted areas was considered as typical. Based on service experience surveys it is however found at present that in many countries composite insulators are installed in light polluted areas. In this case they are typically used in new, compact designs (insulated cross-arms,...
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