AUSZUG | eb - Elektrische Bahnen INT 2/2015

59 113 (2015) INT 2 Contact Lines Tensioning devices based on wheel assemblies for overhead contact lines André Doelling, Erlangen (DE) Tension wheel assemblies type Sicat 8WL5070/71/78 of Siemens AG are balancing weight-based tensioning devices according EN  50119. They were designed in the early 21 st century and tes- ted based on most recent European standards. Main features are tensioning forces up to 40 kN, capable of being integrated in all overhead contact line systems in mainline and mass transit systems, high-level and long-term stable efficiency, maintenance-free design and adjustment length of up to 2,3m. NACHSPANNEINRICHTUNGEN MIT RADSPANNERN FÜR OBERLEITUNGEN Radspanner der Serie Sicat 8WL5070/71/78 zählen zu gewichtsbasierten Nachspanneinrichtungen nach EN 50119. Sie wurden Anfang des 21. Jahrhunderts auf Basis der neuesten europäischen Nor- men gestaltet und geprüft. Wesentliche Merkmale sind Spannkräfte bis zu 40 kN, Integration in alle Oberleitungsanlagen des Nah- und Fernverkehrs, hoher und langzeitstabiler Wirkungsgrad, wartungsfreie Konstruktion sowie Regulierlängen von bis zu 2,3m. APPAREILS TENDEURS AVEC TENDEURS À POULIE POUR CATÉNAIRES Les tendeurs à poulie de la série Sicat 8WL5070/71/78 sont des appareils tendeurs à contrepoids conformes à la norme EN 50119. Ils ont été conçus et vérifiés au début du XXIe siècle sur la base des dernières normes européennes. Leurs principales caractéristiques sont des forces de tension jusqu’à 40 kN, l’intégration dans toutes les lignes aériennes de contact des réseaux grandes lignes et urbains, un rendement élevé et stable sur le long terme, une conception sans entretien ainsi que des longueurs de compensation jusqu’à 2,3m. 1 Introduction When it comes to contact line systems, automatic tensioning devices are important in ensuring a high quality of interaction between pantograph and over- head contact line. Faults and low efficiencies pro- duce position changes of the contact line system. Tension wheel equipment compensate temperature- related position changes of the contact and catenary wires and keep the tensile force of the tensioning section constant. Weight-tensioned assemblies are predominant worldwide thanks to their simple, reli- able and low-cost design. These devices boost the force due to weight with mechanical transmission ratios of 1 : 1,5 to 1 : 5. To the middle of the 1990s, tensioning wheel assemblies were designed for tensile forces up to 20 kN and were then reinforced for 30 kN to ac- commodate high-speed traffic. At the begin- ning of the 21 st century, Siemens developed the Sicat®8WL5070/71 product family (Figure  1) for tensile forces up to 40 kN and with mechanical transmission ratios between 1 : 3 and 1 : 1,5, which compensates clearly larger-scale length changes. They require no maintenance thanks to dry bea­ rings, i.e. greaseless bearings. The family also in- Figure 1: Sicat8WL5070 tension wheel assembly with mechanical transmission ratio of 1:3 and 40kN operating force (all figures by Siemens). 1 tension wheel 2 swing lever with axle 3 fall arresting device 4 suspension 5 safety hoop 6 mounting support for guide tube