Title :
Distinguishing motor starts from short circuits through phase-angle measurements
Author :
Yenchek, Michael R. ; Cawley, James C. ; Brautigain, A.L. ; Peterson, Jeffrey Shawn
Author_Institution :
Pittsburgh Res. Lab., Nat. Inst. for Occupational Safety & Health, Pittsburgh, PA, USA
Abstract :
The 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 :
angular measurement; dust; induction motors; mining; phase measurement; protection; short-circuit currents; starting; National Institute for Occupational Safety and Health; coal mine power systems; dust ignition thresholds; energized electrical apparatus; gas ignition thresholds; induction motors starting; intentional time delays; longwalls; mining; nuisance tripping; phase-angle measurements; short-circuit protection; surface temperatures; underground coal mines; Circuits; Delay effects; Fires; Ignition; Induction motors; Laboratories; Occupational safety; Phase measurement; Power system protection; Temperature;
Journal_Title :
Industry Applications, IEEE Transactions on
