3Io (read as 3I nought and named after zero sequence current) specialises in the following key areas of electrical engineering: Earthing Design and Consulting: 1. Power system earthing design and analysis for substations, towers/poles, power plants, supply transformers, cable joint bays etc. 2. Earth Potential Rise (EPR) studies for substations, towers/poles, cable joint bays 3. Low Frequency Induction Studies due to power lines/cables to third party services such as telecommunications, gas pipelines etc. 4. Power system fault analysis 5. Study of the impacts of the electric and magnetic field due to high voltage power lines/cables 6. Study of the current splits study during earth fault Lightning Studies: 1. Lightning protection design of the the Substations and Power Plants (Rolling Sphere Method) 2. Insulation co-ordination studies of various power system equipment (CBs, Txs, Cables etc.), due to fast front lightning transients 3. Transmission line shielding angle design and lightning performance assessment 4. Sheath voltage limiter investigation study 5. Breaker transient recovery voltage study (TRV Study) Testing Capacity: 1. Current Injection Testing of Electrical Substations of any size 2. Tower/Pole footing resistance testing 3. Soil electrical resistivity testing and earth grid continuity testing