Project start: January 2007
Abstract
The project encompasses two application components of the complex numerical calculation of the transformer electromagnetic field. The first component includes the development and application of procedures for the optimization of the insulation system of combined instrument transformers.
KONČAR – Instrument Transformers Inc. has developed an original Croatian concept of combined transformers with a unique insulation system that has been produced for more than 10 years and makes up around 30% of the total transformer production. Keeping up with the quality requirements, reliability in the production of combined instrument transformers and increased market share impose application of complex numerical calculations of the electromagnetic fields in R&D and design of new combined instrument transformer models. Such an approach significantly speeds up the R&D phase in order to avoid long and expensive modeling and testing.
The main project aim is the development of procedures for the optimization of the insulation systems of combined instrument transformers which will include numerical calculation of the electromagnetic fields. Another component is the development of system applications for accurate calculation of the electric and magnetic fields in the electric power systems. Both in Croatia and abroad, the legislation determines levels of the electric and magnetic fields to which personnel and community can be exposed to. However, in the electric power systems, there are often areas where levels surpass the limits defined by the legislation. The existing regulations do not foresee personnel sojourn in such areas and in that respect, it is necessary to prepare the legal basis for it.
In order to carry out the analysis of the long-term exposure, the quasi-static electromagnetic field on 50 Hz frequency must be calculated. The calculation must encompass not only transformers but also other power plant elements. The statistical behavior of the plant load and personnel sojourn in certain areas, leads to a statistical approach to cumulative exposure calculation.
The overall objective is to develop system application for three-dimensional calculation of the electric and magnetic field in electric power systems, which will enable detailed modeling of relevant plant elements and an accurate calculation in the whole plant. On the basis of this calculation, statistical methods will be used in order to calculate cumulative personnel exposure to electromagnetic fields.