Power factor correction on three-phase diode rectifiers using ripple-power re-rectification and resonant filters [Electronic resource]Järvik, Jaan; Sakkos, Tiiu; Sarv, Vello48. Internationales Wissenschaftliches Kolloquium, 22.-25.09.2003, Technische Universität Ilmenau, Germany : proceedings and our portrait2003 / [8] p. : ill. [CD-ROM] Study of the effects of single phase ground faults to the voltage transformers in the 10 kV medium voltage power networks [Electronic resource]Janson, Kuno; Järvik, Jaan; Külm, Evald; Kütt, Lauri; Šklovski, Jevgeni48. Internationales Wissenschaftliches Kolloquium, 22.-25.09.2003, Technische Universität Ilmenau, Germany : proceedings and our portrait2003 / [10] p. : ill. [CD-ROM]