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Snack Foods – Very Hot Transformer

Food Manufacturing

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 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.
  • Found Neutral bolts loose.
  • Found no support on main LV Tails.
  • Transformer lid removed.
  • Found the core to be very old.
  • Found LV internal busbars were undersized by two thirds.
  • Found core and windings failing.
  • Found customer had been deceived.

The Results

  • J&P replaced transformer for new in 24hours.
  • J&P ensured the correct earthing.
  • J&P put right poor workmanship.
  • J&P maintained professional approach.
  • Customer ended up paying twice for original poor workmanship!
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