نتایج جستجو برای: neuro method toinvestigate transformer inrush current recently

تعداد نتایج: 2629620  

2009
Andreas Ebner ANDREAS EBNER

In the last years controlled switching became an effective method to reduce switching transients which is documented by several publications – especially of CIGRE. Controlled switching is most commonly used for switching capacitor banks. Even though uncontrolled energisation of power transformers can lead to very high inrush current transients whose maximum values can exceed many times the rate...

2012
Ramamohan Reddy

This paper presents an improvement of digital differential relay reliability for protecting a large power transfer is discussed. First, the Fourier sine and cosine coefficients required for fundamental, second third and fifth harmonies determination have been calculated using rectangular transfer technique. Then, these harmonics have been used in harmonics restrain and blocking techniques used ...

2005
Okan Özgönenel

This paper presents the development of a wavelet based algorithm, for distinguishing between magnetizing inrush currents and power system fault currents, which is quite adequate, reliable, fast and computationally efficient tool. The proposed technique consists of a preprocessing unit based on discrete wavelet transform (DWT) in combination with an artificial neural network (ANN) for detecting ...

2016
M. Gopila I. Gnanambal

Power transformers in transmission network are utilized for increasing or decreasing the voltage level. Power Transformers fail to connect directly to the consumers that result in the less load fluctuations. Power transformer operation under any abnormal condition decreases the lifetime of the transformer. Power Transformer protection from inrush and internal fault is critical issue in power sy...

1994
LUIS G. PEREZ ALFRED FLECHSIG JACK L. MEADOR ZORAN OBRADOVIC

A feed forward neural network (FFNN) has been trained to discriminate between power transformer magnetizing inrush and fault currents. The training algorithm used was back-propagation, assuming initially a sigmoid transfer function for the network’s processing units (“neurons”). Once the network was trained the units’ transfer function was changed to hard limiters with thresholds equal to the b...

2017
K. N. Dinesh Babu P. K. Gargava

Energization of a transformer results in sudden flow of current which is an effect of core magnetization. This current will be dominated by the presence of second harmonic, which in turn is used to segregate fault and inrush current, thus guaranteeing proper operation of the relay. This additional security in the relay sometimes obstructs or delays differential protection in a specific scenario...

Journal: :journal of advances in computer research 2015
mehran taghipour-gorjikolaie mohammad yazdani-asrami s. asghar gholamian s. mohammad razavi

one of the major problems that may occur in the differential protection systems of power transformers is mal-operation of the protection relays in sake of internal fault detection, because of similarity between this current and inrush current. this paper presents a novel approach for discriminating inrush current from internal fault in power transformers based on improved gravitational search a...

Journal: :Indonesian Journal of Electrical Engineering and Computer Science 2020

Journal: :International Journal of Intelligent Systems and Applications 2012

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