Advisory Group C4.1	Power Quality
Advisory Group C4.2	EMC
Advisory Group C4.3	Insulation Coordination
Advisory Group C4.4	Lightning
Advisory Group C4.5	Organisation and liaison with TGs
Advisory Group C4.6	Power Systems Dynamic Performance Models and Analysis
JWG C4.105	Benchmarking of Power Quality Performances in Transmission systems
JWG C4.106	Instrument Test Protocols
JWG C4.107	Economic Framework for Voltage Q
TF C4.108	Review of Flicker Obiectives for HV MV and LV systems
JTF C4.109	Emission Assesment Techniques
WG C4.112	Power Quality Monitoring in Flexible Power Networks
WG C4.206	Protection of the High Voltage Power Network Control Electronics Against Intentional Electromagnetic Interference (IEMI)
WG C4.207	EMC with communication circuits, low voltage systems and metallic structures
WG C4.208	EMC in HV Substations and Generating Stations
WG C4.303	Pollution and Environmental Influence on Electrical Performance
WG C4.305	Practices in Insulation Coordination of Modern Electric Power Systems Aimed at the Reduction of the Insulation Level
WG C4.306	Insulation Coordination of UHV AC systems
WG C4.307	Resonance and Ferroresonance in Power Networks and Transformer Energization Studies
JWG A2/C4.309	Electrical Transient Interaction between Transformers and the Power System
TF C4.405	Lightning interception
WG C4.407	Lightning Parameters for Engineering Applications
WG C4.408	Lightning Protection of Low-Voltage Networks
WG C4.409	Lightning Protection of Wind Turbine Blades
WG C4.410	Lightning Striking Characteristics to Very High Structures
WG C4.501	Numerical Electromagnetic Analysis and Its Application to Surge Phenomena
WG C4.502	Power system technical performance issues related to the application of long HVAC cables
WG C4.603	Analytical Techniques and Tools for Power Balancing Assessments
JWG C4/B4/C1.604	Influence of Embedded HVDC Transmission on System Security and AC Network Performance
WG C4.605	Modelling and aggregation of loads in flexible power networks