Title :
Computer system for evaluation of shock hazard in circuits with non-sinusoidal earth currents
Author :
Czapp, S. ; Swisulski, D.
Author_Institution :
Fac. of Electr. & Control Eng., Gdansk Univ. of Technol., Gdansk, Poland
Abstract :
Effects of current on people are mainly considered for 50/60 Hz sinusoidal current and smooth direct current. However, modern low voltage circuits are very often equipped with power electronics converters - rectifiers, frequency converters, therefore non-sinusoidal earth currents (touch currents) occur. For non-sinusoidal currents safety criteria should be modified. This paper presents a computer system, based on LabVIEW environment, for evaluation of shock hazard in case of non-sinusoidal currents. Waveforms of rectified current, current with phase control and current with mixed frequencies are analyzed. Implementation of the safety system enables the disconnection of supply exclusively when real hazard of the ventricular fibrillation occurs. It can be very useful in electric circuits with high demand for continuity of supply.
Keywords :
electric shocks; electrical accidents; electronic engineering computing; hazards; low-power electronics; rectifiers; virtual instrumentation; LabVIEW environment; computer system; frequency converters; mixed frequencies; modern low voltage circuits; nonsinusoidal currents safety criteria; nonsinusoidal earth currents; phase control current; power electronics converters; rectified current; rectifiers; safety system; shock hazard; smooth direct current; supply disconnection; touch currents; ventricular fibrillation; waveforms; Data acquisition; Electrical safety; Non-sinusoidal currents; Touch current;
Conference_Titel :
Nonsinusoidal Currents and Compensation (ISNCC), 2015 International School on
Conference_Location :
Lagow
DOI :
10.1109/ISNCC.2015.7174684
