What maintenance measures are necessary for transformers in electric trains?

Maintenance measures include regular inspections for signs of wear or damage, cleaning to prevent contamination, and testing of insulation resistance and oil quality. Cooling systems should be checked to ensure proper operation. Connections and terminals need tightening and corrosion prevention. Software updates for monitoring and control systems may also be required. Scheduled maintenance helps detect and address issues early, ensuring reliability, safety, and compliance with regulatory standards.