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General Electric (GE) Distribution Transformer Manual —including technical documents from GE Vernova and its joint venture
| Interval | Action | |----------|--------| | Annually | Visual inspection: oil leaks, corrosion, bushing condition | | Every 5 years | Measure insulation resistance; check oil dielectric strength (ASTM D877) | | Every 10 years | Dissolved gas analysis (DGA) & furan analysis | | Every 20 years | Replace gaskets (if EPDM or nitrile shows hardening) |