Enhanced Calculation And Dimensioning Of Outer Corona Protection Systems In Large Rotating Machines

The primary components of electrical field grading systems in modern large rotating machines and especially in large turbo generators are applied to cope with locally increased electrical and thermal stresses affecting the electrical insulation system. In terms of future development and improvement of efficient insulation systems with a higher output to volume ratio adequate tools and techniques are necessary for dimensioning the electrical field grading system in a time and cost saving manner. Numerical calculation models based on the Finite Element Method (FEM) allow a theoretical approach to design electrical field grading systems before approving the functionality in real test setups. Additionally these calculation models help to get an in-depth understanding of specific theoretical…