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Current and potential transformers

 

Current transformers reduce current. Potential transformers reduce voltage. This provides utility meters and protection devices with safe limits to avoid damage to equipment and danger to personnel..

 

Failure modes

  • Dielectric breakdown

  • Damage to bushings

  • Oil/dielectric leaks where applicable

  • Overheating

  • Partial discharge (PD) breakdown

 

Reliability considerations

  • PD monitoring

  • IR scanning

  • Electrical tests

  • Visual checks for damage

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