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Analysis of Exciting Current for Single-phase Four-Limb Ultra-High Voltage Transformer Under DC Bias
Hanke Feng;Ke Wang;Jinzhong Li;Shuqi Zhang;Qingfeng Xie;Xiaobo Hu;Bingliang Li;Song Wang;Shuhong Wang
In order to assess the electromagnetic characteristics of ultra-high voltage (UHV) transformers under DC Bias, a specifically designed scaling transformer is considered for the measurement of the actual distorted exciting current. Meanwhile, the equivalent numerical model based on the Finite element method (FEM) and the field-circuit coupled modelling is adopted. The comparison between the measure...Show More
Frequency Response Analysis of the Transformer Subjected to Twice Short-circuit Impulse Tests Under Two Different Connection Schemes
Song Wang;Shuang Wang;Hao Qiu;Hanke Feng;Shuhong Wang;Ahmed Abu-Siuda
Power transformer is a key equipment in power system. Ensuring the safety operation of transformer is beneficial to decrease the economic loss and casualties. In this paper, twice short-circuit impulse tests are performed on a 10kV transformer. After each test, frequency response analysis (FRA) measurements based on two different terminal connection schemes, namely end to end voltage ratio (EE) an...Show More
Research on Radial Stability and Its Influence Factors of Transformer Windings under Short Circuit Fault
Shuang Wang;Song Wang;Shuhong Wang;Hao Qiu;Hanke Feng;Ting Zhu
The safe operation of power transformers is of great significance to the stability of the power system. Radial stability of windings is an important issue for transformer design and maintenance. This paper presents an effective method to analyze the radial stability of windings. The electromagnetic characteristics of a 110 kV two-winding power transformer is calculated and analyzed by finite eleme...Show More
A Scalar Hysteresis Model of Ferromagnetic Materials Based on the Elemental Operators
Nana Duan;Weijie Xu;Hanke Feng;Shuang Wang;Ze Guo;Yongjian Li;Shuhong Wang;Jianguo Zhu
This paper introduces an elemental operator with biaxial anisotropy to simulate the scalar hysteresis phenomenon of the ferromagnetic materials. The equilibrium position of the magnetization for the elemental operator can be determined by energy minimization. To directly describe the magnetic properties of each operator, an improved analytical expression is deduced by the partial approximate subst...Show More
A New Interpretation of FRA Results by Sensitivity Analysis Method of Two FRA Measurement Connection Ways
Song Wang;Shuhong Wang;Hanke Feng;Ze Guo;Shuang Wang;Hailin Li
IEEE Transactions on Magnetics
Cited by: Papers (17)
As a reliable and non-destructive technique, frequency response analysis (FRA) has been widely recognized for transformer winding deformation detection and assessment. In this paper, frequency response functions (FRFs) are obtained by two different FRA measurement connection ways, namely, end-to-end voltage ratio (EE) and transfer voltage (TF) ratio measurements. At the same time, according to the...Show More
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