The Challenge
A manufacturing facility's incoming power was distributed through 3 transformers (500 kVA, 250 kVA, 100 kVA) installed 14–16 years prior. Monthly electricity consumption had been creeping upward 1–2% annually despite stable production.
What Became Visible
Temperature and efficiency monitoring on the three transformers revealed that thermal performance had degraded significantly. No load increase had occurred, but transformer core and copper losses had increased 8–12% due to aging insulation and core saturation. The 500 kVA transformer was operating 11°C above design temperature at rated load — a sign of imminent thermal instability.
What Changed
The 500 kVA transformer was replaced with a modern, high-efficiency unit rated for a 5–7 year lifetime. The other two transformers were cleaned and their thermal monitoring set to alert at higher temperature thresholds pending replacement planning.
How it worked: Modern transformers have core efficiency 2–4% better than transformers from 10+ years prior. Replacing the aging 500 kVA unit immediately recovered 3.2% of total electricity consumption. The facility added thermal monitoring alerts to plan replacement of the remaining two transformers within 18 months.
Results
electricity consumption
main transformer
flagged for replacement
plus extended equipment life
Aging electrical equipment (transformers, switchgear, cables) degrades thermally and electrically years before it fails. By then, it's been wasting electricity for years. Thermal monitoring reveals aging before failure becomes imminent.
Operational Reality
Most facilities operating with 10+ year old distribution equipment lose 3–8% of electricity to distribution inefficiency without realizing it. Replacement ROI is 2–4 years.