On-Load Tap-Change

Up to 50%of catastrophic transformer failures are related to damaged On-Load Tap-Changers.

Cause of Transformer Failures:
51%-OLTC
17%-Windings
14%-Bushings
09%-Connections
06%-Other
03%-Mechanical


PowerConsultancy has the ability and expertise to service and repair most makes of On-Load Tap-Changers. We can perform a condition assessment of your OLTCs to determine what’s wrong or what can be done to enhance its reliability and residual life. This process can help you to prevent its premature failure.

To keep your OLTCs operating properly, PowerConsultancy can make extensive condition evaluations, diagnose faults and carry out necessary repairs or adjustments:

  • Replace Old or Worn Gaskets.
  • Fix Leaks.
  • Replace Contacts.
  • Check Alignment and Timing.
  • Provide and Replace Phase Moldings.
  • Provide and replace Tap Heads.
  • Check the Regulating Relays for Proper operation.

You indeed will find us to be most economical, very reliable, knowledgeable and quite fast.

On-Load Tap-Changer Palakkad

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