Objective To analyze the operational characteristics of capacity reduction for urban rail transit distribution transformers from the perspectives of economy and reliability, a comprehensive applicability analysis of amorphous alloy distribution transformers in urban rail transit field is conducted, addressing the current status where amorphous alloy transformers exhibit lower no-load losses than silicon steel transformers, yet still encounter certain application limitations.

Method Taking the actual operational data of distribution transformers in Hangzhou Metro Line 8 Phase 1 Project as an example, energy losses of distribution transformers with different capacities are analyzed. Based on economy, temperature rise, short-circuit resistance, interference resistance capability and noise, a comprehensive comparison is conducted between amorphous alloy and silicon steel distribution transformers. Meanwhile, the applicability of amorphous alloy distribution transformers in urban rail transit scenarios is studied in conjunction with actual operational conditions.

Result & Conclusion  At this stage, the capacity selection for urban rail transit distribution transformers is generally oversized. Rationally reducing the distribution transformer capacity can lower initial equipment investment while decreasing the energy loss of the transformer itself. Although amorphous alloy distribution transformers have certain disadvantages compared to silicon steel ones, their performance can meet daily operational requirements of urban rail transit under actual working conditions, and can significantly reduce no-load losses, thereby effectively lowering the overall energy consumption of distribution transformers.