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  1. rah

    Differential relay CT grounding

    Thanks NORMGA, I know it's the right thing to do. I also found that the BUREAU OF RECLAMATION test the insulation integrity of thier CT secondarys once every three years. I will be adding this additional testing to be performed following calibration of our differential relays. RAH
  2. rah

    Differential relay CT grounding

    Does anyone periodically check, via meggering, the insulation integrity of the ct secondary of a differential relay scheme. That is, carefully lift the one grounded point of the ct secondary and megger to ground the secondary wiring to ensure there is no insulation damage that could potentially...
  3. rah

    Motor Start Time vrs Motor Age

    Motor start time and applicable torque curves for different voltage levels are or can be provided by the Manufacturer at the time of purchase of large 4 kv induction motors (greater than 800 hp). Understanding this, will the start time for the same given voltage value and load torque increase...

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