Magnetizing inrush current of shell-type three-phase transformer

1981 ◽  
Vol 101 (3) ◽  
pp. 56-64 ◽  
Author(s):  
Hironori Amano ◽  
Kazumi Okuno
Keyword(s):  
Inrush Current ◽  
Shell Type ◽  
Magnetizing Inrush Current ◽  
Three Phase

scholarly journals A Method for Identification of Transformer Inrush Current Based on Box Dimension

2017 ◽  
Vol 2017 ◽  
pp. 1-6
Author(s):  
Maofa Gong ◽  
Ran Zheng ◽  
Linyuan Hou ◽  
Jingyu Wei ◽  
Na Wu
Keyword(s):  
Fundamental Difference ◽  
Box Dimension ◽  
Inrush Current ◽  
Fault Current ◽  
Differential Protection ◽  
Phase Current ◽  
Magnetizing Inrush Current ◽  
Three Phase ◽  
Transformer Differential Protection ◽  
Box Dimensions

Magnetizing inrush current can lead to the maloperation of transformer differential protection. To overcome such an issue, a method is proposed to distinguish inrush current from inner fault current based on box dimension. According to the fundamental difference in waveform between the two, the algorithm can extract the three-phase current and calculate its box dimensions. If the box dimension value is smaller than the setting value, it is the inrush current; otherwise, it is inner fault current. Using PSACD and MATLAB, the simulation has been performed to prove the efficiency reliability of the presented algorithm in distinguishing inrush current and fault current.

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

An Identification Method of Magnetizing Inrush Current Phenomena in Distribution System

2010 ◽  
Vol 130 (4) ◽  
pp. 430-436 ◽  
Author(s):  
Naoki Dou ◽  
Atushi Toyama ◽  
Kohki Satoh ◽  
Tadashi Naitoh ◽  
Kazuyuki Masaki
Keyword(s):  
Distribution System ◽  
Inrush Current ◽  
Identification Method ◽  
Magnetizing Inrush Current

An Identification Method of Magnetizing Inrush Current Phenomena by Voltage Waveform

2012 ◽  
Vol 132 (6) ◽  
pp. 588-596
Author(s):  
Tadashi Naitoh ◽  
Keiki Takeda ◽  
Atsushi Toyama ◽  
Tatsuhiko Maeda
Keyword(s):  
Inrush Current ◽  
Voltage Waveform ◽  
Identification Method ◽  
Magnetizing Inrush Current

An Improved Identification Method of Magnetizing Inrush Current Phenomena in Distribution System

2012 ◽  
Vol 132 (3) ◽  
pp. 260-267 ◽  
Author(s):  
Tatsuhiko Maeda ◽  
Tadashi Naitoh ◽  
Atsushi Toyama ◽  
Keiki Takeda
Keyword(s):  
Distribution System ◽  
Inrush Current ◽  
Identification Method ◽  
Magnetizing Inrush Current
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