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Nonlinear Load and RLC Pulse Shaping Surge Generator Models in Simulation Environment

Edirisinghe M.

International Letters of Chemistry, Physics and Astronomy

2014

Vol. 17, iss. 3

334--347

The present study was performed in order to understand how a nonlinear load affects the characteristics of the RLC pulse shaping surge generator waveforms under simulation studies. The obtained results were compared when analytical equations were used as source models for both 1.2/50 s voltage & 8/20 s current impulses. Three circuit models; Capacitor Bank generator, Combination waveform generator and Schaffner generator were evaluated under nonlinear loads varied from 10Ω to 106 Ω for voltage impulses and for current impulses it was from 10-4 Ω to 1 Ω. As it can perceive from the analysis, delay time, rise time and FWHM remain unchanged throughout the tested impedance range when used model equations as generator sources. It was found that for voltage impulses, these values were 4.95 μs, 1.20 μs and 81.8 μs respectively. For current impulses, these values were 16.2 μs, 8.02 μs and 20.7 μs respectively. However results obtained for generator circuit models shows that delay time, rise time and FWHM deviated from above values up to maximum of 35.15 %, 106.67 % & 115.16 % respectively for voltage impulses. For current impulses these deviations were up to maximum of 79.63 %, 48.75 % & 39.61 % respectively. The deviations were due to influence caused by the nonlinear load to the generator circuit parameters and effective internal impedance.

Comparison of capacitors by means of a double-channel digitizer

Agrez D.

Metrology and Measurement Systems

2005

Vol. 12, nr 3

275-283

In the paper, a comparative method of measurement of the capacitors by measuring the voltages across them and phase angle between is presented. In the analysis of errors the systematic loading effects of the connection and their elimination has been described. The reductions of the systematic and the random errors of sampling and quantization have been performed in the frequency domain. Application of the method is possible with support of the modern digital signal processors and with interpolated DFT to improve the accuracy and speed of the measurement.

W pracy przedstawiono komparacyjną metodę pomiaru pojemności kondensatorów drogą pomiaru napięć i różnicy fazy. W analizie dokładności uwzględniono błędy wynikające z połączeń i podano sposób ich eliminacji. Metodą cyfrowego przetwarzania sygnałów w dziedzinie częstotliwości osiągnięto redukcję systematycznych i przypadkowych błędów próbkowania i kwantyzacji.