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Detection and location of faults on power systems have great importance in term of being able to clear faults in a short time and provide more available service to customers. Since sensitive determination of fault location is necessary, it is required to measure the arrival time of the travelling waves accurately and to use corresponding propagation velocity of the cable. However, when a fault location...
Grounding systems are necessary for safety of people to be exposed to dangerous voltages during any fault and for equipment by keeping their proper operation. In design of grounding grids, it is important to minimize the cost of grounding grid by considering tolerable touch voltage and step voltage values defined in regulations. For this purpose it is necessary use an optimization tool in order to...
This study proposes an improved particle swarm optimization method to find optimal power flow by using the power transmission loss as an objective function. In the literature, PSO is a well — known intelligent search method to handle the solution of optimal power flow problem. A novel scheme which is called Improved PSO (IPSO) is defined by modifying the initialization step of PSO algorithm and choosing...
Wavelet-based de-noising is used to separate partial discharge (PD) signals from the noises resulting from measurement circuits or the surrounding environment. PD de-noising by using the wavelet shrinkage method is capable of separating the noise component to some extent, but the selection of the wavelet base has a remarkable effect on the de-noising results. The wavelet base is directly related to...
Power system performance is affected by transient phenomena such as different faults on power cables and transmission lines. Detection/location of the faults has great importance in order to be able to clear the fault as soon as possible and provide more reliable service to power customers. When a fault location scheme is utilized for this purpose, which uses the velocity of the propagation as a parameter...
High voltage insulators are important part of power transmission and distribution network. Design of an insulator has importance in terms of both reliable operation of equipment and systems. However, various parameters have to be considered during an insulator design such as electric field distribution, mechanical strength, dimensions, which affect each other. Therefore, an optimization is necessary...
Impulse voltage tests are essential to inspect and test insulation integrity of high voltage apparatus. On the other hand, generated impulse currents are used for different test applications such as investigation of high current effects, electromagnetic interference (EMI) testing, etc. Obtained voltage and current waveforms usually have some sort of interferences originated from the different sources...
As transmission line voltages increased in time, corona occurring on conductors had more importance in terms of both corona losses, their impact on power transmission as well as leading to electromagnetic interference. One of the major challenges of corona discharge measurements is separation of corona signals from different type of noises resulting from measurement circuit or surrounding environment...
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