Control of 32 steps,64 steps and more steps can be realized with the phase current and time of flow changing when both single phase and double phases mixed excited based on the micro-step control theory.

The main control parameters of SRD are opening angle,turn-off angle,phase current and phase winding voltage.

By virtue of the good property of frequency division of wavelet packets,the phase currents of feeders of a distribution network with a single phase to ground fault,are decomposed to obtain the outputs of different frequency bands.

After analysisofcouples in the three-phase currentaboutsmelting furnace making MgO, two factors hadbeen analyzed affectingthe coupling coefficient.

A hybrid optic fiber sensor is proposed with three sensor heads,a optic fiber sensing arm,a signal process which can measure three phase currents simultaneously,and its experimental results in single phase is abtained.

the relation between the broken phase current and the loads was found and the protective project was summarized when some phase of the three asynchronous motor was broken off during its operation, the workable voltage and the workable current were supervised timely by MCS, or when the curre.