178 / 2022-03-14 15:45:52

Simulation Research on Electrodynamic Force and Deformation of Transformer Windings under Short-circuit Condition

transformer, short circuit, electrodynamic force, deformation

Simulation Research on Electrodynamic Force and Deformation of Transformer Winding under Short circuit Condition

Yuhui Zhai，Qingquan Li

Shandong Provincial Key Laboratory of UHV Transmission Technology and Equipment, Shandong University,Jinan 250061

2810116539@qq.com

Purpose/Aim

As the important equipment of power conversion in power grid system, transformer operation is related to the safe and stable operation of the entire power grid system. It will affect itself, other surrounding power equipment and even the entire regional power grid when transformer short circuit fault occurs. Considering the safety and cost, it’s not practical to conduct transformer short circuit experiments, so it’s necessary to simulate and analyze the electrodynamic force and deformation of transformer winding under the condition of short circuit based on simulation software.

Experimental/Modeling methods

The 3D simulation model of the transformer is established based on the finite element simulation software. The transformer short circuit is simulated through the relevant settings, and then the related research on electrodynamic force and deformation is carried out.

Results/discussion

Through simulation and comparison, it is found that the simulation results are consistent with the practical theory and reflect the condition of transformer short circuit well.

Conclusions

The following conclusions are obtained after short circuit simulation research:

(1) The magnetic leakage after short circuit is mainly distributed in the empty channel between high and low voltage winding. The bending of the magnetic field lines at the end of the winding causes the axial magnetic leakage to be larger than the radial magnetic leakage;

(2) After short circuit, the high and low voltage winding is subjected to expansionary force and compressing force respectively in radial, and they are subjected to compressing force in axial; The high and low voltage winding have different degrees of deformation under the short circuit impact, the trend of deformation is the same as the force condition;

(3) According to the weak link of winding, the reasonable proposal of strengthening winding short circuit resistance is proposed.