Silicone cable accessories appeared in the late 1960ies, Triggered - PowerPoint PPT Presentation

13,04 13,0 4 INTRODUCTION 6,03 • Silicone cable accessories appeared in the late 1960ies, • Triggered by extruded XLPE-cables, • Field-grading and insulating parts in a prefabricated body, • Easy assembly, Avoidance of mounting errors, • Design constantly refined, • What is the State of the Art? 7,90 Silicones for Cable Accessories 1 of 19 2017, November, 8th

13,04 13,0 4 MEDIUM VOLTAGE POWER CABLE 6,03 outer insulation (jacket) outer conductor outer conductive layer main insulation inner cond. layer inner conductor 7,90 Silicones for Cable Accessories 2 of 19 2017, November, 8th

13,04 13,0 4 TYPICAL DESIGN OF SILICONE JOINT 6,03 connector insulating spiral conductive/ silicone cable support permittivesilicone elastomer insulation core elastomer 7,90 Silicones for Cable Accessories 3 of 25 2015, March 4th

13,04 13,0 4 6,03 CABLE JOINTS (molded ans extruded) 7,90 Silicones for Cable Accessories 4 of 19 2017, November, 8th

13,04 13,0 4 TYPICAL DESIGN OF A SILICONE TERMINATION 6,03 Surface is exposed to wheathering and pollution – Erosion resistance! 7,90 Silicones for Cable Accessories 5 of 25 2015, March 4th

13,04 13,0 4 CABLE ACCESSORIES - TYPES OF ACCESSORIES 6,03 7,90 Silicones for Cable Accessories 6 of 19 2017, November, 8th

13,04 13,0 4 TASKS OF CABLE ACCESSORIES 6,03 Field grading Electrical connection Sealing To withstand weathering 7,90 Silicones for Cable Accessories 7 of 19 2017, November, 8th

13,04 13,0 4 TYPES OF SILICONE MATERIALS 6,03 Elastomers (LSR) Elastomers (HCR) Pastes Gels 7,90 Silicones for Cable Accessories 8 of 19 2017, November, 8th

13,04 13,0 4 MATERIAL PROPERTIES 6,03 General requirements for materials for CA not standardized. IEC 62039TR:2007 covers the material for outdoor cable accessories and defines the following properties: • Breakdown Field Strength, • Resistance to Tracking and Erosion, • Resistance to Chemical Attack, • Resistance to Corona and Ozone, • Resistance to Weathering and UV, • Resistance to Chemical and Physical Degradation by Water, • Resistance to Flammability, • Tear Strength, • Arc Resistance, • Volume Resistivity, • Glass Transition Temperature, • Hydrophobicity. 7,90 Silicones for Cable Accessories 9 of 19 2017, November, 8th

13,04 13,0 4 IEC 60587 - TRACKING AND EROSION 6,03 7,90 Silicones for Cable Accessories 10 of 19 2017, November, 8th

13,04 13,0 4 TRACKING AND EROSION (for terminations)) 6,03 Class 1 A 3.5 is the minimum requirement acc. ti IEC 62039TR; Our silicone elastomers typically show the highest class 1 A 4.5 7,90 Silicones for Cable Accessories 11 of 19 2017, November, 8th

13,04 13,0 4 BREAKDOWN FIELD STRENGTH 6,03 New Edition of IEC 60243 with subclause „Elastomers“: Use test specimens of (1,0 ± 0,1) mm thickness with sufficient lateral dimensions to prevent flashover … . . As electrode arrangement, unequal electrodes according 5.2.1.3 (see Figure 1c) shall be used. In the case of elastomers of low hardness, e.g. silicone rubbers, a suitable casting material shall be used as embedding material or surrounding medium, respectively. 7,90 Silicones for Cable Accessories 12 of 19 2017, November, 8th

13,04 13,0 4 ELECTRODE ARRANGEMENT 6,03 7,90 Silicones for Cable Accessories 13 of 19 2017, November, 8th

13,04 13,0 4 ELECTRODE ARRANGEMENT 6,03 7,90 Silicones for Cable Accessories 14 of 19 2017, November, 8th

13,04 13,0 4 BREAKDOWN FIELD STRENGTH (old arrangment) silicone elastomer number 6,03 specific breakdown voltage [kV/mm] 7,90 Silicones for Cable Accessories 15 of 19 2017, November, 8th

13,04 13,0 4 BREAKDOWN FIELD STRENGTH (new arrangment) silicone elastomer number 6,03 specific breakdown voltage [kV/mm] 7,90 Silicones for Cable Accessories 16 of 19 2017, November, 8th

13,04 13,0 4 6,03 Thank you very much for your kind attention! 7,90 Silicones for Cable Accessories 17 of 19 2017, November, 8th