We report on an instrument for applying ac and dc magnetic fields by capturing the flux from a rotating permanent magnet and projecting it between two adjustable pole pieces. This can be an alternative to standard electromagnets for experiments with small samples or in probe stations in which an applied magnetic field is needed locally, with advantages that include a compact form-factor, very l...

The traditional infrastructure of power system industry is presently going through large amount of change that consensus over the improvement of power quality for fulfilling this requirement electronically automated devices having high sensitivity toward the disturbance in the power system signals are under the major consensus of research activities. The low power quality signal is responsible ...

Transformers are major elements of any power systems. Normally they must be properly protected by differential relays. This protection system should be precise and reliable via implementation of strong algorithms that able to differentiate between faulted and unfaulted condition to fully grantee of power continuity. This system should be able to detect the non-faulted condition, such as inrush ...

Magnetization reversal motors (MRMs) have been proposed as with lower power losses. MRMs comprise the same configuration interior permanent magnet synchronous motors; however, a low coercive force core is applied to stator. Driving an MRM requires pulse current for magnetizing stator core. In this paper, bipolar magnetizer driving Moreover, relationship between passive components reported in te...

New types of appliances sometimes bring unexpected power quality problems. On several locations it was reported that energy-saving lamps cause random false tripping of circuit breakers. In all of these cases these lamps had electronic drivers. An investigation of this phenomenon is presented in the paper. Laboratory measurements were done on several types of LED and gas-discharge lamps to obtai...