A New Method of Transformer Short-Circuit Impedance Regulation Based on Magnetic Shunts

Zhijun Ye, Hao Jia (), Wei Cai and Wenhui Zeng
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Zhijun Ye: College of Information Science and Engineering, Huaqiao University, Xiamen 361021, China
Hao Jia: College of Information Science and Engineering, Huaqiao University, Xiamen 361021, China
Wei Cai: College of Information Science and Engineering, Huaqiao University, Xiamen 361021, China
Wenhui Zeng: College of Information Science and Engineering, Huaqiao University, Xiamen 361021, China

Energies, 2024, vol. 17, issue 15, 1-21

Abstract: Short-circuit impedance is an important economic and technical index to test the cost, efficiency and operation safety of transformers. Increasing the short-circuit impedance of the transformer can reduce the influence of the transformer fault current on the system. The short-circuit impedance of a general power transformer is 4~7%. When the short-circuit impedance is too small, the short-circuit current is too large, which will cause harm to electrical equipment. This paper proposes a method to adjust the short-circuit impedance by adding magnetic shunts of different thicknesses between the high and low voltage windings of the transformer. Compared with other methods, this method does not change the structure of the transformer core and winding, and is simple and efficient. In this paper, a three-dimensional simulation model of a single-phase multi-winding transformer is established by Altair Flux to study the influence of the thickness of magnetic shunts on the short-circuit impedance of a transformer. The feasibility of the proposed method is verified by comparing the simulation with the measured values. The magnetic shunt is also introduced into the three-phase transformer. The result shows that adding magnetic shunts of different thicknesses between the high and low voltage windings of the transformer will change the distribution and size of the leakage of the magnetic field. The short-circuit impedance increases significantly with the increase in the thickness of the magnetic shunt, but a certain number of magnetic shunts have minimal effects on the efficiency of the transformer.

Keywords: short-circuit impedance; transformer magnetic circuit; magnetic shunts; finite element method (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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