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It is important to have a proper protection system in order to protect any equipments from high currents. High impulse currents can be caused by lightning, temporary over voltages and over loading. Under protection systems, a few research areas can be addressed such as on relay protection systems, SCADA or Supervisory Control and Data Acquisition and lightning protection systems. The effectiveness...
Detection of groups of coherent generators is very important for balanced and optimal power system separation. Synchrophasor technology has made it possible to get the real time phasors i-e voltage and current along with the frequency. This real time information can be used to find groups of coherent generators. Hierarchical clustering algorithm is used on the rate of change of the generator bus voltage...
Compact fluorescent lamps are tested under DC operating conditions. Five random samples are evaluated in term of their starting and operation response compared to normal AC environment. Experiment result shows that DC line supply has successfully able to start and operate any conventional CFL at almost the same lux level and power consumption rate of 240ac rms.
DC magnetic systems are a key element of many electromagnetic devices. In a number of cases, the magnetic systems of such devices must meet requirements of complying with the proportionality principle. A method of optimizing the linear dimensions and parameters of a system with a special geometrical configuration is developed taking this principle into account. The dimensionless coefficient of the...
Power outage is a common problem when there are electrical faults occurred, which would lead to discontinuity of electrical supply to domestic building. For domestic consumers, power continuity is very important since some of the appliances such as refrigerator, aquarium and alarm system require a continuous electrical supply. However, fault occurred in the system will trip the earth leakage circuit...
This paper investigates the performance of a three designs of tubular linear permanent magnet motors (TLPMMs) with quasi-Halbach magnetized moving-magnet armature and slotted stator with a single-slot. The motors were developed for reciprocating compressor applications such as household refrigerators. The three designs have different magnet shape structures, and the stator core of all designs have...
The method of assessing the insulation condition in high voltage (HV) electrical equipments can never be overemphasized. Over the years, several method of assessing the insulation condition have been researched & used by many researchers. One of these methods is using the dielectric response of the materials to determine the Polarization and Depolarization Current (PDC). PDC is a non-destructive...
Research and development of hybrid excitation flux switching motors (HEFSMs) that combined both permanent magnet (PM) and DC field excitation coil (FEC) as their main flux sources have been an attractive investigation recently due to their overwhelming performances as well as flux control capabilities. Among different types of HEFSMs, the motor with both PM and FEC located on the stator has the advantage...
Flux switching machines (FSMs) that consist of all flux sources in the stator have been developed in recent years due to their advantages of single piece and robust rotor structure suitable for various speed applications. They can be categorized into three groups that are permanent magnet (PM) FSM, field excitation (FE) FSM, and hybrid excitation (HE) FSM. Both PMFSM and FEFSM has only PM and field...
Boltzmann machine are examined for its ability to accelerate the performance of doing data mining by using technique named as Reverse Analysis method. In this paper, we describe how Hopfield network perform better with Boltzmann machine technique and able to induce logical rules from large database by using reverse analysis method: given the values of the connections of a network, we can hope to know...
Wave energy as a predictable renewable energy, can be directly captured from surface wave, which has a significant power. Although the application of wave energy in recent years is rapidly increased all over the world especially in Europe, but there is a lack of research in this field in some developing countries. Hence, in this study a new research about potential of wave in Southern border of Caspian...
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