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Electric shock hazard in circuits with variable-speed drives

Abstrakt

The conventional approach to electrical safety under fault condition in typical power systems considers earth fault currents of sinusoidal waveform and frequency of 50/60 Hz. However, in circuits with variable-speed drives, there is earth fault current flow with harmonics, and these harmonics influence the threshold of ventricular fibrillation. The paper presents earth fault current waveforms in circuits with variable-speed drives without inverter output (motor) filter and with one of the two types of inverter output filters being used. The details of both filters are presented, and the effect of harmonics of earth fault current on ventricular fibrillation is evaluated. Furthermore, the effect of harmonics, which occurs in circuit of variable-speed drive, on the tripping current of residual current devices is presented. Residual current devices may be utilized to ensure protection against direct and indirect contact, but limitations in their proper operation, due to harmonics, may exist. Operational characteristics of a proposed residual current device dedicated to circuits with earth fault current containing harmonics, as in the variable-speed circuits, are presented.

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Informacje szczegółowe

Kategoria:
Publikacja w czasopiśmie
Typ:
artykuł w czasopiśmie wyróżnionym w JCR
Opublikowano w:
Bulletin of the Polish Academy of Sciences-Technical Sciences nr 66, strony 361 - 372,
ISSN: 0239-7528
Język:
angielski
Rok wydania:
2018
Opis bibliograficzny:
Czapp S., Guziński J.: Electric shock hazard in circuits with variable-speed drives// Bulletin of the Polish Academy of Sciences-Technical Sciences. -Vol. 66, nr. 3 (2018), s.361-372
DOI:
Cyfrowy identyfikator dokumentu elektronicznego (otwiera się w nowej karcie) 10.24425/123443
Weryfikacja:
Politechnika Gdańska

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