Results 251 to 260 of about 7,540 (299)

Introduction to Power Transformer Protection

2020
India is a leading country and its economy grows day by day by attracting foreign direct investments (FDI). Production, manufacturing, industrial, software, and all other business depends on reliable electricity supply with a slogan of “without power-no business”, shows the importance of reliable power supply.
Dharmesh Patel, Nilesh Chothani
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Power Transformer Protection using ANN and Wavelet Transforms

2021 7th International Conference on Advanced Computing and Communication Systems (ICACCS), 2021
Three-phase Power transformers protection algorithm is proposed in this paper by using wavelet transform and ANN method. The current waves obtained are decomposed by using wavelet transforms. ANN technique is used as pattern classifier. Extensive case studies show that wavelet transformation provides preliminary feature extraction effectively for ...
R.Naveena Bhargavi, M.Lakshmi Swarupa, M. Rajitha   +2 more
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The surge protection of power transformers

Journal of the Institution of Electrical Engineers, 1939
The paper commences by reviewing the methods adopted for the protection of overhead lines and transformers from the incidence of lightning. Itis then pointed out that in manycases it is not economic, and in others technically difficult, to provide sufficient line protection, so that transformers connected to such lines are likely to be subjected to ...
J.L. Miller, J.M. Thomson
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Protection of Power Transformers By Using Continuous Wavelet Transform

MELECON 2006 - 2006 IEEE Mediterranean Electrotechnical Conference, 2006
This paper presents the development of wavelet based transformer protection algorithm. Continuous wavelet transform (CWT) is used for analyzing discontinuities in the primary current signal during internal faults. A custom-built transformer with different tap windings is used for the laboratory studies.
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Power Transformer Protection Using Improved S-Transform

Electric Power Components and Systems, 2011
Abstract This article presents the detection and classification of a fault and abnormal conditions that occur in power transformers based on improved S-transform. The feature items are selected from improved S-transform, which is a very powerful time-frequency analysis tool.
Z. Moravej, A. A. Abdoos, M. Sanaye-Pasand   +2 more
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Walsh transform based digital protection of power transformer

ACE '90. Proceedings of [XVI Annual Convention and Exhibition of the IEEE In India], 2005
The problem of protection of power transformers against abnormal conditions such as faults etc. has been of great concern to the protection engineers. Traditionally, percentage differential relaying scheme has been used to protect the transformer against internal faults, even though this relaying scheme may mal operate due to various reasons such as ...
R.K. Barnwal, P.K. Kalra, L.P. Singh
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An approach to power transformer protection based on wavelet transform

2005 International Power Engineering Conference, 2005
A transformer model considering the hysteresis effect is presented first and magnetic inrushes and short-circuit faults are simulated with this model. The wavelet transform is a powerful tool in the analysis of power transformer transient phenomena because of its ability to extract information from transient signals simultaneously in both the time and ...
null Lu Jiping, null Chen Ying, null Yang Xue, null Wenyuan Li   +3 more
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Neutralizing transformer to protect power station communication

Electrical Engineering, 1936
In considering the subject of protecting communication circuits at electric power plants and substations by means of neutralizing transformers, this paper gives particular attention to the problems incident to the localized rise in ground potential caused by power system faults. Several specific installations are discussed and illustrated.
E. E. George, R. K. Honaman, L. L. Lockrow, E. L. Schwartz   +3 more
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Differential protection of power transformers using the wavelet transform

2014 IEEE PES General Meeting | Conference & Exposition, 2014
Several disturbances involving power transformers commonly occur in the Electric Power System. External faults near the transformer, internal faults, as well as transformer energizing and overexcitation are the main events evaluated in the protection of the power transformers.
R. P. Medeiros, F. B. Costa, J. F. Fernandes   +2 more
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Power transformer protection using wavelet packet transform

2014 International Conference on Computer Communication and Informatics, 2014
This paper presents a novel technique for power transformer protection. This technique is based on extracting current signals under different operating conditions such as during energization of transformer and different fault conditions. Fast wavelet transform (FWT) schemes may not be so effective for data that has mainly oscillating features.
K. Ramesh, M. Sushama
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