- AG D1.01 Liquids and Liquid Impregnated Insulation Systems
- AG D1.02 High Voltage and Current Testing and Diagnostic
- AG D1.03 Insulating Gases
- AG D1.04 Solid Materials
- CAG D1 Customer Advisory Group
- JWG A2/D1.46 Field Experience with Transformer Solid Insulating Ageing Markers
- JWG D1 B3.57 Dielectric Testing of gas-insulated HVDC Systems
- JWG D1/A2.47 New Frontiers of DGA Interpretations for Power Transformers and their Accessoiries
- JWG D1/B1.49 Harmonized test for the measurement of residual inflammable gases
- SAG D1 Strategic Advisory Group
- TAG D1 Tutorial Advisory Group
- WG D1.44 Testing of Naturally Polluted Insulators
- WG D1.48 Properties of Insulating Materials under VLF Voltages
- WG D1.50 Atmospheric and altitude correction factors for air gaps and clean insulators
- WG D1.51 Dielectric performance of eco-friendly gas insulated systems
- WG D1.52 Moisture measurement in insulating fluids and transformer insulation
- WG D1.53 Ageing of upgraded cellulose and cellulose impregnated in ester liquids
- WG D1.54 Basic principles and practical methods to measure the AC and DC resistance of conductors of power cables and overhead lines
- WG D1.56 Field grading in electrical insulation systems
- WG D1.58 Evaluation of dynamic hydrophobicity of polymeric insulating materials under AC and DC voltage stress
- WG D1.59 Methods for dielectric characterisation of polymeric insulating materials for outdoor applications
- WG D1.60 Traceable measurement techniques for very fast transients
- WG D1.61 Optical corona detection and measurement
- WG D1.62 Surface Degradation of Polymeric Insulating Materials for Outdoor Applications
- WG D1.63 Partial discharge detection under DC stress
- WG D1.64 Electrical insulation techniques at cryogenic temperatures
- WG D1.65 Mechanical properties of insulating materials for power transformers
- WG D1.66 Requirements for partial discharge monitoring systems for gas insulated systems
- WG D1.67 Dielectric performance of new non-SF6 gases and gas mixtures for gas-insulated systems
- WG D1.68 Natural and synthetic esters - Evaluation of the performance under fire and the impact on environment
- WG D1.69 Guidelines for test techniques of High Temperature Superconducting (HTS) systems
- WG D1.70 Functional properties of modern insulating liquids for transformers