Numerical Simulation of Transient Temperature Rise on 110 kV/40 MVA Vehicle-Mounted Mobile Transformer

Vehicle-mounted mobile transformers are installed on mobile platforms, characterized by their compact structure and convenient transportation. It can be used as a temporary transformer when the capacity of the main transformer in a substation is insufficient or the power planning and construction do not meet the requirements. In order to analyze the temperature distribution in the compacted 110 kV/40 MVA mobile transformer at this voltage and capacity level, a single-phase axisymmetric 2-D finite element model of the mobile transformer was established, and transient temperature rise of the transformer was simulated using the short-circuit method. The results show that the maximum hotspot temperature reached 87.9 ℃ when the total losses were applied, while it reached 85.2 ℃ when the rated current was applied. The temperature rise satisfies the conditions for safe operation, indicating that the transformer’s structural design is reasonable and has good heat dissipation performance.