Official SC A2 documents The official SC A2 documents define the guidelines which are necessary for the SC Members and Conveners to carry out their work. The Term of Reference (ToR) define the scope, content, deliverables and timeframe of the Working Groups (WG) within the SC. TERMS OF REFERENCE FOR SC A2 WG A2.24 Thermal Performance JWG A2/B4-28 HVDC Converter Transformer WG A2.32 Cooper Sulphide in Power Transformer Insulation WG A2.33 Transformer Fire Safety Practices WG A2.34 Guide for Transformer Maintenance WG A2.35 Experiences in service with new liquids WG A2.36 Guide for Transformer Procurement Process WG A2.37 Transformer Reliability Survey WG A2.38 Transformer Thermal Modelling JWG A2/C4.39 Electrical Transient Interaction between Transformers and the Power System