Control of unusual mal-operation of three-phase power transformer differential protection due to ultra saturation phenomenon based on Clarke׳s Transform and Discrete Wavelet Transform

2015 ◽  
Vol 51 ◽  
pp. 1276-1287 ◽  
Author(s):  
Bahram Noshad ◽  
Behzad Ghanavati ◽  
Mostafa Ahmadzadeh ◽  
Saeid Mohammadzadeh
Keyword(s):  
Wavelet Transform ◽  
Discrete Wavelet Transform ◽  
Power Transformer ◽  
Discrete Wavelet ◽  
Differential Protection ◽  
Saturation Phenomenon ◽  
Three Phase ◽  
Transformer Differential Protection

A New Algorithm for Three-Phase Power Transformer Differential Protection Considering Effect of Ultra-Saturation Phenomenon Based on Discrete Wavelet Transform

2018 ◽  
Vol 20 (1) ◽  
Author(s):  
Bahram Noshad
Keyword(s):  
Wavelet Transform ◽  
Discrete Wavelet Transform ◽  
Power Transformer ◽  
Discrete Wavelet ◽  
Inrush Current ◽  
Differential Protection ◽  
Inductive Load ◽  
Saturation Phenomenon ◽  
Three Phase ◽  
Transformer Differential Protection

Abstract One of transient phenomena that lead to the false trip of the power transformer differential protection during the energization of a loaded power transformer is the ultra-saturation phenomenon. This paper presents, at first, a new algorithm for three-phase power transformer differential protection considering effect of the ultra-saturation phenomenon based on Discrete Wavelet Transform (DWT). To model the ultra-saturation phenomenon, the nonlinear characteristic of the transformer core and the effect of the saturation of the current transformers are taken into account. It is assumed that the load of the transformer is a resistive and inductive load. In this algorithm, the ultra-saturation phenomenon, the external and internal faults of power transformer and the magnetic inrush current are simulated. To distinguish between these phenomena, appropriate criteria using DWT by the use of standard deviation of coefficients are presented. Also, one of the most important criteria for the digital relays is the time for making a decision. Thus, to determine the time of decision, the experimental results will be presented.

A power transformer differential protection based onsupport vector machine and wavelet transform

2021 ◽  
Vol 197 ◽  
pp. 107297
Author(s):  
Lucas D. Simões ◽  
Hagi J.D. Costa ◽  
Matheus N.O. Aires ◽  
Rodrigo P. Medeiros ◽  
Flavio B. Costa ◽  
...  
Keyword(s):  
Wavelet Transform ◽  
Power Transformer ◽  
Differential Protection ◽  
Transformer Differential Protection
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