This cast resin transformer maintenance checklist helps technicians document key asset details and complete essential inspections for safe, reliable operation. Record transformer designation, manufacturer, serial number, date of manufacture, voltage, rating, and vector group. Verify operation of interlocks; inspect and secure the outer housing; confirm proper earthing; clear vents; and check the condition and torque of HV and LV terminations and cables. Assess windings, resin, core, internal earthing, and tap connections, and remove dust and debris. Review protection settings including current alarm and trip, and test temperature alarm and trip. Conclude by confirming all tools and equipment are removed from the work area.
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