Survey and call for experts and project leader - TS 50537-4: Railway applications - Mounted parts of the traction transformer and cooling system - Part 4: Gas and liquid actuated (Buchholz) relay for liquid immersed transformers and reactors with conservator for rail vehicles

Survey and call for experts and project leader - Power transformers and reactor fittings - Part 2: Gas and oil actuated relay for liquid immersed transformers and reactors with conservator

Power transformer and reactor fittings - Part 8: Oil drain devices - Section 2: Filling openings for oil immersed distribution transformers without conservator