Numerical investigation for transient electromagnetic force computation of power transformer during short-circuit condition

2016 ◽  
Vol 52 (3-4) ◽  
pp. 1141-1149 ◽  
Author(s):  
Hyun-Mo Ahn ◽  
Seong-Yun Kim ◽  
Joong-Kyoung Kim ◽  
Yeon-Ho Oh ◽  
Sung-Chin Hahn
Keyword(s):  
Numerical Investigation ◽  
Electromagnetic Force ◽  
Power Transformer ◽  
Short Circuit ◽  
Transient Electromagnetic ◽  
Short Circuit Condition

Computation of Radial Electromagnetic Forces on Power Transformer LV Windings due to Short-Circuit Currents

2013 ◽  
Vol 732-733 ◽  
pp. 1069-1073 ◽  
Author(s):  
Han Bo Zheng ◽  
Jin Hua Han ◽  
Wei Wang ◽  
Xiao Gang Li ◽  
Yu Quan Li
Keyword(s):  
Mechanical Stress ◽  
Case Studies ◽  
Calculation Method ◽  
Electromagnetic Force ◽  
Radial Direction ◽  
Low Voltage ◽  
Power Transformer ◽  
Short Circuit ◽  
Leakage Flux ◽  
Short Circuit Currents

The short-circuit electromagnetic force in radial direction induces critical mechanical stress on a power transformer. In this paper, the radial short-circuit forces which are exerted on transformer low voltage (LV) windings are investigated. Firstly, the mechanisms of leakage flux and short-circuit electromechanical forces in transformer coils are analyzed. Afterwards, based on IEC standards followed by short-circuit tests, calculations of radial short-circuit forces and evaluations of the ability to withstand short currents in LV windings are developed. The case studies and comparisons with improved measures show that the evaluation and calculation method is feasible and effective, and this method also offers three useful ways to strengthen the ability to withstand short-circuit currents for transformer windings.

Finite-Element Analysis of Short-Circuit Electromagnetic Force in Power Transformer

2011 ◽  
Vol 47 (3) ◽  
pp. 1267-1272 ◽  
Author(s):  
Hyun-Mo Ahn ◽  
Ji-Yeon Lee ◽  
Joong-Kyoung Kim ◽  
Yeon-Ho Oh ◽  
Sang-Yong Jung ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Electromagnetic Force ◽  
Power Transformer ◽  
Short Circuit ◽  
Element Analysis

Computation and Analysis of Static and Dynamic Radial Stability of Power Transformer Inner Winding

2014 ◽  
Vol 986-987 ◽  
pp. 1926-1929
Author(s):  
Xin Sun ◽  
Yan Li ◽  
Fang Xu Han ◽  
Jian Li
Keyword(s):  
Dynamic Stability ◽  
Electromagnetic Force ◽  
Power Transformer ◽  
Short Circuit ◽  
Experimental Results ◽  
Field Calculation ◽  
Product Analysis ◽  
Instability Phenomenon ◽  
Static And Dynamic Stability ◽  
Leakage Field

In this paper, the size of winding electromagnetic force after short circuit has been acquired through leakage field calculation and analysis on power transformer, and based on the computation results, the radial stability experimental results of large capacity power transformer inner winding short-circuit model were compared to the simulation values to guide actual product analysis and checking. With the accumulated simulation experience on this model, then a type of sfz9-80MVA power transformer inner coil static and dynamic stability has been checked to confirm the radial instability phenomenon could whether or not occur on this product.

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