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Title

Discrimination Between Inrush and Short Circuit Currents in Differential Protection of Power Transformer Based on Correlation Method Using the Wavelet Transform

فصلنامه انرژی و محیط زیست ایران، دوره: 2، شماره: 4
Year: 1390
COI: JR_IJEE-2-4_003
Language: EnglishView: 729
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Authors

M Rasoulpoor - Faculty of Electrical and Engineering Systems,Shahrood University of Technology, Shahrood, Iran Corresponding Authro
M Banejad - Faculty of Electrical and Engineering Systems,Shahrood University of Technology, Shahrood, Iran
A Ahmadyfard - Faculty of Electrical and Engineering Systems,Shahrood University of Technology, Shahrood, Iran

Abstract:

This paper presents a novel technique for transformer differential protection to prevent incorrect operation due to inrush current. The proposed method in this paper is based on time-frequency transformknown as the Wavelet transform. The discrete Wavelet transform is used for analysis the differential currentsignals in time and frequency domains. The investigation on the energy distribution of the signal on the discrete Wavelet transform components shows the difference distribution between inrush and internal fault current signals of power transformer. The correlation factor which is a statistical parameter is used here toexpress the pattern of the energy distribution for different current signals. The proposed algorithm is based onthe correlation factors to distinguish between internal fault and inrush currents in the transformer differential protection. The proposed algorithm is tested and simulated for several cases by simulating inrush and internal fault currents. The simulation of inrush and internal fault currents are performed using electromagnetic transientprogram PSCAD/EMTDC software. Simulation results show that the proposed scheme accurately identifiesinrush and fault currents at the distance of the power transformer protection in a time period less than quarter of power frequency cycle. In addition the proposed method has high sensitivity and reliability. The method has low computation work and not requires determining the threshold for each new power system

Keywords:

Inrush current % Differential protection % Power transformer % Discrete wavelet transform (DWT)% Internal fault

Paper COI Code

This Paper COI Code is JR_IJEE-2-4_003. Also You can use the following address to link to this article. This link is permanent and is used as an article registration confirmation in the Civilica reference:

https://civilica.com/doc/251881/

How to Cite to This Paper:

If you want to refer to this Paper in your research work, you can simply use the following phrase in the resources section:
Rasoulpoor, M and Banejad, M and Ahmadyfard, A,1390,Discrimination Between Inrush and Short Circuit Currents in Differential Protection of Power Transformer Based on Correlation Method Using the Wavelet Transform,https://civilica.com/doc/251881

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Type of center: دانشگاه دولتی
Paper count: 8,554
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