Title :
The effects of harmonics on overcurrent protection devices
Author :
Brozek, James P.
Author_Institution :
Cooper Ind., St. Louis, MO, USA
Abstract :
Harmonic distortion and its effects on current waveforms are reviewed. The problems produced by higher order harmonics, hysteresis losses in the transformers´ cores, and the currents´ high crest factors are discussed. Several solutions to the effects of harmonic distortion on overcurrent devices such as circuit breakers, fuses, and relays are presented, including derating the transformers, and motors to avoid overheating and sizing the overcurrent devices by measuring load currents using only true RMS sensing meters.<>
Keywords :
circuit breakers; electric fuses; harmonics; magnetic hysteresis; overcurrent protection; relays; transformer cores; RMS sensing meters; circuit breakers; fuses; harmonic distortion; high crest factors; hysteresis losses; load currents; overcurrent protection devices; relays; transformer cores; Circuit breakers; Current measurement; Distortion measurement; Fuses; Harmonic distortion; Hysteresis motors; Protection; Protective relaying; Size measurement; Transformer cores;
Conference_Titel :
Industry Applications Society Annual Meeting, 1990., Conference Record of the 1990 IEEE
Conference_Location :
Seattle, WA, USA
Print_ISBN :
0-87942-553-9
DOI :
10.1109/IAS.1990.152455
