Actuator Design of a New AC PM Contactor with Energy-Saving and Noise-Free Characteristics
Developments in power electronic switches and lowcost actuator based on an electronic control module (ECM) have made it possible to design and implement modern control strategies for a new AC permanent magnet (PM) contactor. Such an attempt has made in this work for a colenoid actuator controlling the AC PM contactor. Certain important issues in design including the making signal generator and its amplifier, breaking signal generator and its amplifier, exciting coils, and a voltage regulator have been resolved. The proposed scheme is validated through extensive numerical simulations and a laboratory scale implementation.
Magnetic field analysis and control circuit design of permanent magnet actuator for AC contactor
A new permanent magnet actuator and its control circuit are designed to develop a series of permanent magnet AC contactor in this paper. The magnetic fields and the electromagnetic forces on the armature at different armature positions are computed by the finite element method based on a parametric mesh generation. The charging and discharging procedures are simulated and experimentally measured. The simulation and experimental results are in good agreement.
Ground Fault Protection for Electric Utility Generating Station Medium Voltage Auxiliary Power Systems
Most generating station designs have medium voltage auxiliary power systems with low resistance grounded neutrals.1 In order to provide even higher reliability, the auxiliary power distribution system configurations supply increasingly redundant process equipment.