Title :
The computation of the effects of harmonic currents on transformers using a coupled electromagnetic-thermal FEM approach
Author :
Driesen, Johan ; Belmans, Ronnie ; Hameyer, Kay
Author_Institution :
Dept. of Electr. Eng., Katholieke Univ., Leuven, Belgium
Abstract :
The use of coupled electromagnetic-thermal finite element methods to estimate the thermal impact of power system harmonics on transformers is illustrated. At first, the magnetic modelling of transformers is outlined with attention for the core, windings and the external source or loads. Particular attention is paid to the foil windings. The loss computation and the thermal modelling is discussed. The calculation of the global coupled problem using a mixed frequency and time domain approach, for the steady-state as well as for a long-term transient evolution, is treated. These methods are applied to a 30 kVA distribution transformer. The results are compared with measurements. A derating procedure based on the simulated hot spot temperature is presented
Keywords :
finite element analysis; losses; power system harmonics; power transformers; thermal analysis; transformer cores; transformer windings; 30 kVA; core; coupled electromagnetic-thermal FEM approach; derating procedure; distribution transformer; external loads; external source; finite element methods; foil windings; global coupled problem; harmonic currents effects; long-term transient evolution; loss computation; magnetic modelling; mixed frequency/time domain approach; power system harmonics; simulated hot spot temperature; steady-state; thermal impact; transformers; windings; Electromagnetic coupling; Finite element methods; Magnetic cores; Magnetic domains; Power system harmonics; Power system modeling; Power system transients; Steady-state; Temperature; Transformer cores;
Conference_Titel :
Harmonics and Quality of Power, 2000. Proceedings. Ninth International Conference on
Conference_Location :
Orlando, FL
Print_ISBN :
0-7803-6499-6
DOI :
10.1109/ICHQP.2000.897767
