Estimation of the electric strength of insulation system of an HV combined instrument transformer using 3D analysis
The methods of shaping an insulation system of a voltage and current Part of nit HV combined instrument transformer are considered Electrostatic shields, modifying the electric field inside the winding insulation, have been applied. The author's software was used to optimise the number, dimension and position of the electrostatic control shields in the voltage and current windings. Field computations, permitting the estimate of insulation systems' effectiveness and optimising the insulation systems' geometry, were carried out. Computations of thc 3D electric field distributions for several different versions of insulation systems are compared The equipotential lines and diagrams of the electric field strength are presented, allowing conclusions concerning shapes of constructions to be made. Conclusions concerning constructional modifications ai-E given also. The author has shown? the use of numerical methods in the designing Process.
transformers electrical fields field analysis capacitance