• Repair
  • Recondition
  • Redesign
  • IEEE/ANSI testing and design standards
  • Cooper Authorized Service center
  • Units are refilled with FR3 fluid and mineral oil
  • New copper windings
  • Core/coil go through a dehydration process for moisture reduction
  • All new gaskets
  • Thorough inspection of tap changer mechanism
  • Control repair available
  • CRA upgrade kit available
  • Doble testing available
  • PT rewind available
  • Mail coil rewinds
  • VPI technology


Electrical tests include:

  • transformer turns ratio (TTR)
  • insulation resistance
  • applied potential (hi-pot)
  • induced potential (double induced)
  • load, no-load test
  • tested at full rated voltage through all 32 steps
  • Doble tested (power factor, excitation current)

Copies of test results, quality assurance sheet and inspection reports are shipped with the newly repaired unit

Factory Trained Technicians

Brandon and Clark’s regulator repair personnel are Cooper factory trained and certified. Our technicians have been trained by the experts at Cooper on how to troubleshoot and repair regulators and their controls.

Contact Us

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