| SAG | Strategic Advisory Group |
| CAG | Customer Advisory Group |
| TAG | Tutorial Advisory Group |
| AA1 | Advisory Area for Substations Concepts and Developments |
| CG B3/B5/A3 | Cooperation Group B3/B5/A3 |
| WG B3.12 | Obtaining value from Condition Monitoring |
| WG B3.13 | Reducing replacement time of HV Equipment |
| WG B3/C1/C2.14 | Circuit Configuration Optimisation |
| WG B3.26 | Guidelines For The Design And Construction Of AC Offshore Substations For Wind Farms |
| WG B3.17 | Residual Life Concepts Applied to HV GIS |
| WG B3.18 | SF6 Tightness Guide |
| WG B3.22 | Technical requirements for substations exceeding 800 kV |
| WG B3.25 | 25 SF6 gas analysis for AIS, GIS and MTS condition assessment |
| WG B3.21 | Turnkey Substations |
| WG B3.23 | Guidelines for uprating and upgrading of substations |
| WG B3.06 | Substation Management |
| WG B3.10 | Primary /Secondary system interface modelling for total asset performance optimization |
| WG B3.01 | Substation concepts (just disbanded) |
| JWG B3/B1.09 | Application of Long High Capacity Gas Insulated Lines in Tunnels (just disbanded) |