1. Insulation systems and diagnosis Abstract Optimisation of the surface protection of transformers or inductive components that are placed in humid ambient Task description Large distribution transformers, inductive components in the automotive area or for railway applications are exposed to difficult environment issues like humidity or dirt. The surface protection has a high influence on the ageing and thus the lifetime of inductive components. We are developing a new surface protection with super hydrophobic characteristics similar to the lotus effect. Researches for appropriate materials need to be done. The items have to go through tests under multiple stress like humidity and electric stress. High voltage measurements for partial discharge need to be done. Requirements You are short before finishing university, electrical engineering
2. Optimisation of inductive components - saturation strong iron core chokes Calculation basics for saturation strong iron core chokes Limits and possibilities of the calculation with standard software Calculation via electromagnetic fields Harmonics and peak current calculation
3. Optimisation of inductive components - high voltage transformers Research of the winding construction Construction and influence of the iron core HV winding grounding and its effects
4. Research of the fields in high voltage transformers and high potential transformers
5. Concept and construction of a choke test system up to 10 000 A Iron core chokes and air chokes
6. Construction of a test system for large transformers up to 250 kVA Load simulation by switching into the company net
7. Optimisation of cooling channels of dry power transformers
8. Thermal behaviour of three-phase transformers from 100 kVA up to 250 kVA - calculation and practical measurement
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