Results 241 to 250 of about 6,833,731 (285)

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
openaire   +1 more source

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
openaire   +1 more source

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
openaire   +1 more source

Relay Protection of Power Transformers

Transactions of the American Institute of Electrical Engineers, 1947
This report of the AIEE relay subcommittee presents the results of a 3-year investigation of present and preferred practices in the relay protection of power transformers. Consideration is given to the influence of advances in the protective art and progress in the design of and methods of operating power transformers. A survey covering experience with
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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
openaire   +1 more source

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
openaire   +1 more source

Differential Protection Enhancement for Power Transformer

2021
A power transformer is protected against internal faults using a differential protection which is sensitive and a fast. However, during transformer magnetization (inrush current or over-excitation), the differential relay may operate unnecessarily.
Hamid Bentarzi, Rachid Bouderballa
openaire   +1 more source

Impedance protection for power transformers

2015 68th Annual Conference for Protective Relay Engineers, 2015
The distance protection principle, when applied to over-head lines and cables, is well known, widely applied and well proven. Also on large generating blocks it is often applied as one of the back-up protection functions. When it comes to typical power transformers, the conventional distance protection however has some limitations which have limited ...
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Intelligent protection scheme for power transformer

2017 North American Power Symposium (NAPS), 2017
This paper presents the development of a small-scale model of a single-phase transformer differential protection scheme in a laboratory environment. The developed model is realistic in nature as it closely resembles various phenomena that occur in an actual transformer.
Yogesh M. Makwana, Bhavesh R. Bhalja, Ashesh M. Shah, Jignesh M. Solanki   +3 more
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A new scheme for power transformer protection

2003 IEEE PES Transmission and Distribution Conference and Exposition (IEEE Cat. No.03CH37495), 2004
In this paper, a new transformer protection scheme is proposed which is based on the combination of virtual 3rd harmonic restrained and sampled value differential principles. The differential protection restrained by virtual 3rd harmonic can identify asymmetric and symmetric inrush currents with semi-cycle data window and accelerate the protection ...
J.C. Yang, X.G. Yin, D.S. Chen, Z. Zhang, Z.H. Wang   +4 more
openaire   +1 more source