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IFD :: the Internal Fault Detector

IFD :: the Internal Fault Detector . Overview Training video How it works New line crew practices. Overview :: 2 functions. Internal arcing fault detection …flag comes out when internal fault has occurred Pressure relief device …pull the ring to operate manually. Training video.

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IFD :: the Internal Fault Detector

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  1. IFD :: the Internal Fault Detector • Overview • Training video • How it works • New line crew practices

  2. Overview :: 2 functions • Internal arcing fault detection …flag comes out when internal fault has occurred • Pressure relief device …pull the ring to operate manually

  3. Training video • ~ 9 minutes • The video is on a separate DVD but can also be linked to this presentation as an .avi or .mpeg file, if you wish

  4. How it works :: Internal fault conditions • Undetected faults – potential hazard • Hazard increases as fault progresses • Highest risk when re-energizing • Designed to detect first fault occurrence at low fault current levels • As low as 500 amps • Rapid pressure rise from fault…as low as 0.5 psi / 5-7 ms

  5. What does an internal fault look like? • A rapid, transient pressure rise occurs in every internal arcing fault • Variable peak pressure • Consistent rate of rise

  6. New line crew practices • If fuse cutout is open and the IFD has not activated, likely OK • still conduct all your normal safety check procedures • If the IFD has activated, replace the transformer • it has failed internally and is dangerous to re-energize

  7. Transport & handling :: Installation • Shipping lock prevents the sensor from activating when moving the transformer: • Complete normal hook-ups & checks • Remove the shipping lock • Energize the transformer

  8. Transport & handling :: Re-transporting • Before removing a good transformer from service, install the orange shipping lock to prevent the IFD from inadvertently activating.

  9. 3-ph Banks • IFD Speeds up troubleshooting

  10. Padmount transformers & Voltage Regulators • Identical sensor…same features and operating guidelines: • Ensure shipping lock is on when moving transformer • When flag is activated do not re-energize

  11. Additional information • See your Standards Engineer, Operations Supervisor or Safety coordinator And, • www.ifdcorporation.com

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