![]() ![]() One contractor, for example, developed a flexible mounting platform that fits both the pivoting and non-pivoting cross-arms from both selected suppliers. Only one of these contractors already had related experience with this kind of construction, used in the past in Italy. Initially, the work was perceived as highly challenging since it required completely new cross-arms erected with innovative work methods and tools. To build new compact lines within the framework of the Stevin Project, four contractors were selected. In order to maintain as much of the existing tower silhouettes as possible on complete sections and also to be able to withstand high compression loads, Elia decided to employ pivoting Vees (PV) for tangent towers (up to 3 gon running angle) and a non-pivoting Vee (NPV) design for small running angles of < 10 gon.Īpplication of NPVs was also used to limit section lengths with PVs in order to avoid stability risks, according to the IEEE guide. Development of new test methods and verification of complete design.Type testing according to specifications.Evaluation of different designs from the viewpoint of maximum permissible E-field.a compact line based on composite insulated cross-arms, resulted in a comprehensive project that included a number of distinct phases: ![]() Transporting about 10 times more electricity.Īdvertisement Design & Testing Insulated Cross-ArmsĪpplication of this relatively new technology, i.e. Pre-existing 150 kV line (left) with new 380 kV compact line A high diversity of technical and innovative solutions – such as a compact line with insulated cross-arms – were seen as necessary to promote public acceptance and facilitate obtaining the necessary permits to realize the project. It addressed several key needs, of which connection to growing offshore wind generation in the North Sea (up to 2200 MW) and a new interconnection capability (1000 MW) with the U.K. As a result, the Stevin Project had the goal of creating a new 380 kV connection between the coast and Elia’s existing 380 kV backbone grid. The existing 150 kV grid in the coastal region of Belgium was deemed insufficient to meet future energy needs. This edited past contribution to INMR by Jean-François Goffinet of Elia, discussed experience with insulated cross-arms gained during the Stevin Project. Another key driver has been providing capacity to cope with the planned closure of nuclear plants by 2025 along with the associated expected increase in renewables. It was therefore vital that the country’s TSO, Elia, made provisions for increasing energy imports and exports. The Belgian transmission system is an integral part of the European Network of Transmission System Operators (ENSTO-E).
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