Title :
Through phase-angle measurements [induction motor starting safety]
Author :
Yenchek, Michael R. ; Cawley, James C. ; Brautigam, Albert L. ; Peterson, Jeffrey Shawn
Author_Institution :
Pittsburgh Res. Lab., Nat. Inst. for Occupational Safety & Health, Pittsburgh, PA, USA
Abstract :
The US National Institute for Occupational Safety and Health investigated how the starting of induction motors may cause nuisance tripping of short-circuit protection on coal mine power systems. This research had a dual purpose: (1) to identify how motor-start waveforms differ from those for short circuits; and (2) to devise a method to provide short-circuit protection without intentional time delays to account for motor starts. This technology will help ensure that surface temperatures of energized electrical apparatus will not exceed gas or dust ignition thresholds when short circuits occur
Keywords :
explosions; induction motors; industrial power systems; machine testing; mining; overcurrent protection; phase measurement; power system faults; power system protection; safety; short-circuit currents; starting; National Institute for Occupational Safety and Health; USA; apparatus surface temperatures; coal mine power systems; dust ignition thresholds; gas ignition thresholds; induction motor starting; motor-start waveforms; nuisance tripping; short-circuit protection; through phase-angle measurements; time delays; Circuits; Delay effects; Health and safety; Ignition; Induction motors; Laboratories; Occupational safety; Phase measurement; Power system protection; Temperature;
Conference_Titel :
Industry Applications Conference, 2000. Conference Record of the 2000 IEEE
Conference_Location :
Rome
Print_ISBN :
0-7803-6401-5
DOI :
10.1109/IAS.2000.883204
