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Semi-discrete method for time-domain analysis of electromagnetic field

Gawrylczyk K. M.

Poznan University of Technology Academic Journals. Electrical Engineering

2010

No. 62

7-14

Semi-discrete method is known since 80's. The method provides analytical solution in time, so the time-stepping may be omitted. Comparing to usual finite elements in time, this method seems not to be numerically effective, because produced matrices are dense. From this reason, it was rather rarely used. But now, carrying out sensitivity analysis with adjoint models [1, 2] we have to obtain the solutions in forward and backward time. The both time points should coincide with each other. For space discretization we use finite elements, as usual. The semi-discrete method allows us to determine analytically the continuous solution for any given time of analysis. In this work we show evaluation of this method for different kind of excitation shapes.

Modelling of current-limiting circuit breakers

Stih Z., Haznadar Z., Topolnik M., Berberovic S.

Journal of Technical Physics

2002

Vol. 43, no 4

483-488

A circuit model of current-limiting circuit breakers that enables the simulation of the limiting process as well as the analysis of the parameters of transient phenomena is described. The model consists of a system of non-linear time-dependent differential equations that has to be coupled to the numerical solution of the magnetic field in the contact space. Reliability of such breakers highly depends upon the actuator in the tripping system. The modelling of the dynamic response of the actuator is based on the response surface methodology and on the lumped parameter time domain simulation of response of actuator to a voltage pulse. The results of the simulations are compared with measurements.