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Distinguishing motor starts from short circuits through phase-angle measurements.

Authors
Yenchek-MR; Cawley-JC; Brautigam-AL; Peterson-JS
Source
IEEE Trans Ind Appl 2002 Jan/Feb; 38(1):195-202
NIOSHTIC No.
20023073
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
Coal-mining; Mining-industry; Electrical-safety; Electrical-hazards; Underground-mining; Mining-equipment; Electrical-equipment; Electrical-properties; Electronic-circuits; Voltage-regulation;
Contact
National Institute for Occupational Safety and Health, Pittsburgh Research Laboratory, P.O. Box 18070, Pittsburgh, PA 15236-0070
CODEN
ITIACR
Publication Date
20020101
Document Type
Conference/Symposia Proceedings; Journal Article
Email Address
mby5@cdc.gov
Editors
Bridger-B Jr.
Fiscal Year
2002
NTIS Accession No.
NTIS Price
ISBN No.
078036404X
Issue of Publication
1
ISSN
0093-9994
NIOSH Division
PRL
Source Name
IEEE Transactions on Industry Applications
State
PA
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