A sequential phase energization technique for transformer inrush current reduction part i: simulation and experimental results

2005 ◽  
Author(s):  
Yu Cui ◽  
S. Abdulsalam ◽  
Shiuming Chen ◽  
W. Xu
Keyword(s):  
Experimental Results ◽  
Inrush Current ◽  
Current Reduction ◽  
Sequential Phase

Mitigation of Magnetizing Inrush Current using Sequential Phase Energization Technique

1970 ◽  
Vol 108 (2) ◽  
pp. 67-70 ◽  
Author(s):  
M. Jamali ◽  
M. Mirzaie ◽  
S. Asghar-Gholamian
Keyword(s):  
Thermal Stresses ◽  
High Amplitude ◽  
Inrush Current ◽  
Fault Currents ◽  
Magnetizing Inrush Current ◽  
Three Phase ◽  
Analytical Formulas ◽  
Current Reduction ◽  
Sequential Phase

Energization of a transformer under no load or lightly loaded conditions may result in inrush current with high amplitude that can be comparable with the fault currents. These currents have undesirable effects, including malfunction of the differential relay, mechanical and thermal stresses on transformer and reduced power quality of the system. In this paper, a sequential phase energization technique has been used to mitigate magnetizing inrush current in a grounded system. Because in this technique, the size of the resistor, which is connected to the neutral point of the transformer, has an important role, analytical formulas have been derived to calculate inrush current amplitude with a neutral resistor. These analytical formulas have been implemented in the M-File of the MATLAB software for calculation of different inrush current reduction ratio. Then for the verification of the results, the obtained neutral resistor has beenapplied to the equivalent circuit of a typical three-phase transformer and inrush current reduction has been determined by MATLAB SIMULINK. Ill. 7, bibl. 13 (in English; abstracts in English and Lithuanian).http://dx.doi.org/10.5755/j01.eee.108.2.147

Single-Phase Transformer Inrush Current Reduction Using Prefluxing

2012 ◽  
Vol 27 (1) ◽  
pp. 245-252 ◽  
Author(s):  
Douglas I. Taylor ◽  
Joseph D. Law ◽  
Brian K. Johnson ◽  
Normann Fischer
Keyword(s):  
Single Phase ◽  
Inrush Current ◽  
Current Reduction

scholarly journals Reduction of Harmonics Cause of Inrush Current for Transformer

2020 ◽  
Vol 9 (5) ◽  
pp. 1-4
Keyword(s):  
Voltage Drop ◽  
Inrush Current ◽  
Source Impedance ◽  
Different Types ◽  
Current Reduction ◽  
Switching Method ◽  
The Impact ◽  
Transformer Core ◽  
Secondary Winding ◽  
Sequential Switching

Due to the impact of inrush current of transformer, made a voltage drop by source impedance as well as by sensitive loads. That’s why, necessary action is required to reduce the inrush current. Many factors like, secondary winding load, material of transformer core, Saturation flux/residual flux of transformer core, capacity of transformer, supply impedance, voltage-starting phase angle, are affecting the inrush current of transformer. Some different types of methods for inrush current reduction are listed in this paper. Out of that, sequential switching method is adopted for the reduction inrush current.

scholarly journals Elimination of inrush current in parallel transformers by sequential phase energization

2007 ◽  
Vol 4 (5) ◽  
pp. 147-152 ◽  
Author(s):  
K. P. Basu ◽  
Ali Asghar ◽  
Stella Morris
Keyword(s):  
Inrush Current ◽  
Sequential Phase
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