The Investigation of Thermodynamic Processes in Pulsed Coils with Crowbar Circuit

Abstract

The analysis of thermodynamic processes in pulsed coils with crowbar circuit and resistive ballast is described. Great overheating due to Joule heating takes place in pulsed coil during operation. The influence of crowbar circuit on generated pulse shape and coil overheating is analyzed. The model was carried out using Matlab Simulink software and applied for numerical simulation of transient processes that took place in winding of pulsed coil. The numerical simulation of pulsed currents and temperature rise were carried out for different values of resistive ballast using the same experimental equipment and laboratory conditions. Depending on resistance of the crowbar resistive ballast fall time of generated pulse has changed at wide range and as a result temperature rise in Cu-Nb windings of pulsed coil has changed too. Using 0,2 – 0,4 Ohm ballast temperature rise decreased drastically and overheating due to Joule heating has been avoided even without initial cooling. Applied model of transient processes took place in pulsed coils with crowbar circuit and resistive ballast was verified experimentally and acceptable compliance of experimental and numerically simulated results was achieved. Ill. 6, bibl. 11 (in English; abstracts in English, Russian and Lithuanian).