How often should a transformer be maintained and what should be checked first?

Routine inspection frequency depends on environment and load severity, but most projects use monthly visual checks, quarterly operational checks, and annual comprehensive maintenance.

For oil-immersed units, priority items include oil level, oil quality, leakage points, winding temperature, and abnormal noise. For dry-type units, focus on ventilation channels, dust buildup, terminal tightness, and hotspot alarms.

Any sudden temperature rise, unusual vibration, or repeated protection trips should trigger immediate diagnostics rather than waiting for the next scheduled maintenance cycle.