Transformer maintenance priority; Loading, ambient temperature, oil/winding temperature gauge, cooling status, and age of the last oil analysis. It depends. This preliminary assessment will indicate your priority with a fat test (DGA) and thermography; Hot spots and remaining life can only be determined by IEEE C57.91 load analysis and laboratory oil testing..

Priority = loading + temperature + cooling + fat analysis age factors
Example calculation: %90 yüklenme + yüksek ortam sıcaklığı + 3 yıldan eski yağ analizi → ‘yüksek öncelik’; IEEE C57.91 yüklenme analizi ve DGA/termografi önerilir.

Transformer Cooling / Oil — Preliminary Assessment

Determine your priority for oil testing/thermography for the transformer based on load, temperature, and maintenance indicators. This preliminary assessment is for awareness purposes.

Important: This preliminary assessment, This does not replace hot-spot/life analysis or laboratory oil testing (DGA, moisture, dielectric strength) performed according to IEEE C57.91 load guidelines; This is for maintenance prioritization purposes only. Hot-spot temperature and remaining life are calculated using actual load profile and transformer data.
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How is it calculated?

  1. Select the load condition and ambient temperature.
  2. Select the oil/coil temperature indicator and cooling status.
  3. Select the age of the last fat analysis and press Evaluate.

Frequently Asked Questions

How often should transformer oil be analyzed?
For power transformers, a DGA (dissolved gas analysis) is typically recommended once a year; more frequently for critical/high-load transformers. The exact schedule is determined according to the importance of the transformer.
What does transformer thermography show?
It detects anomalies such as connection and bushing overheating, cooling (radiator/fan) problems, and unbalanced loading without requiring contact.
Does this tool provide the hot-spot temperature?
No. Hot spots and aging are calculated using the IEEE C57.91 load guidelines and the actual load profile; this tool only provides maintenance priority.

Related tools and services

This tool and its content are for general informational purposes only; they do not constitute a binding inspection/declaration of conformity. Definitive results will be determined through on-site inspection in accordance with relevant legislation and standards. Get a quote →