Snack Foods – Very Hot Transformer
During a recent site visit to a snack food manufacturer, a J&P engineer noticed a very hot 11kV transformer that fed the whole site. This transformer was only two-thirds loaded at a power factor of 0.99.
Clearly, something was wrong!
The Challenge
The customer explained that this transformer was supplied in 2015 by another contractor as a new unit. The exterior of this transformer looked relatively new. The rating plate stated 2014. The transformer is a 2000kVA oil-filled unit with a close-coupled HV Switch. Due to the temperature (92⁰), our engineer was very concerned and advised the customer that immediate investigation was required.
The Solution
- J&P was tasked with this investigation.
- J&P isolated the HV Supply.
- J&P found numerous serious issues.
- We found Neutral bolts loose and no support on the main LV Tails.
- We then lifted the transformer lid and found the core to be very old.
- We also found that the LV internal busbars were undersized by two-thirds and that the core and windings were failing.
The Results
- J&P replaced the transformer for new in 24 hours.
- J&P ensured the correct earthing.
- J&P put right poor workmanship.
- J&P maintained a professional approach.
- The customer ended up paying twice for the original poor workmanship!
Lights out? We answer.
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