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Transformer PM Best Practices

Transformer PM Best Practices

Transformer PM Best Practices

(OP)

Can someone offer a short summary of Transformer PM Best Practices for visual, mechanical, and electrical testing/inspection and the recommended intervals. The particular one in question is a customer owned, pad mount, 12.5kV x 480V serving critical loads.

 

RE: Transformer PM Best Practices

Well, pad mounted transformers are generally treated differently than regular power transformers.  Their very design is made for a "set it and forget it" philosophy.

However, since it is critical, I would recommend the tests outlined in NETA Maintenance Test Specification:  Oil sampling annually for dissolved gases and physical properties, and electrical tests every two years, three if it's in a nice, clean location.

old field guy

RE: Transformer PM Best Practices

Electrical Test - Annualy
- IR
- Wdg Resistance
- Low voltage excitation current
- Earth Resistance measurments

Protection Tests - Annual
- Bucchholz
- PRV
- Protection relays if installed

Inspection - Annual
- For oil leak
- Corrosion
- Earthing - protective
- Connection Tightness
- Bushing Inspection

Other
- DGA - Annual / as required
- Structural Integrity

Hope this  helps.

NC

 

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