Technical activities At the moment D1 includes the following active working groups: Ref. Number - Title / Convenor CSAG D1 - Strategic and Customer Related Advisory Group / J. Smit AG D1.01 - Insulating Lquids / L. Lundgaard AG D1.02 - High Voltage Testing and Diagnostic / M. Muhr AG D1.03 - Insulating Gases / U. Schichler AG D1.04 - Insulating Solids / J. Densley AG D1.05 - Capacitors / M. Rinaldi AG D1.06 - Emerging Technologies WG D1.01 - Liquid Impreganted Systems for Transformers / L. Lundgaard WG D1.07 - Solid Insulating Materials for Rotating Machines / H. Sedding WG D1.14 - Material Properties for Nonceramic Outdoor Insulation / J. Kindersberger WG D1.15 - HTSC-Material Applications & Cooling / H. Okubo WG D1.17 - HV Asset Condition Assessment Tools, Data Quality and Expert Systems / E. Gulski WG D1.18 - Emerging Technologies in Power Systems WG D1.19 - Solid Insulation Endurance under Repetitive Transient Voltages / J. Holboell WG D1.20 - Water Tree Detection in XLPE insulation / J. Densley WG D1.24 - Potential of Polymer Nanocomposites as Electrical Insulation for Highly Stressed Insulation Material in AC and DC Application / T. Tanaka WG D1.23 - Diagnostics and Accelerated Life Endurance Testing of Polymeric Materials for HVDC Application / G.C. Montanari WG D1.25 - Application Guide for PD Detection in GIS using UHF or Acoustic Methods / U. Schichler WG D1.26 - Basic Principles to Determinate Methane Content of Cross-linked Solid Insulation of MV and HV Cables / S. Pelissou WG D1.33 - High Voltage Test and Measuring Techniques / M. Muhr