Working groups area The following links provide access to a brief description to the corresponding individual Working Group. There the private area of the WG can also be accessed by members of the WG with the appropriate password. AG A3.01  Strategic Planning AG A3.04  Tutorials WG A3.06  Reliability of High Voltage Equipment WG A3.15  Non-Conventional Instrument Transformers (NCIT's) WG A3.17  Evaluation of Stresses of Surge Arresters and Appropriate Test Procedures WG A3.21  Aspects for the application of non-ceramic insulators to HV and MV apparatus WG A3.22  Technical requirements for substation equipment exceeding 800kV WG A3.23  Application and feasibility of fault current limiters in power systems WG A3.24  Tools for Simulating Internal Arc and Current Withstand Testing