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  1. Dhruv B Patel

    Dear team, Could you help to int

    As data is not available for this old motor, the Worst case service factor is 1. Does 100% OL settings(52A)a good choice? How Acceleration settings (GE 859 Relay) of the motor is determined? Thanks.
  2. Dhruv B Patel

    Dear team, Could you help to int

    Thanks all for the above guidance. Further, the main task is to determine the protection settings of this motor (480 kW,6.6 kV,0.85 PF, 52A: no other data available). Below is the previously installed P&B gold relay which will be replaced by a newer 859 relay. Could you assist me to interpret...
  3. Dhruv B Patel

    Dear team, Could you help to int

    Dear team, Could you help to interpret this Motor Nameplate data? The main interest is to interpret the locked rotor current and safe stall time. The Rotor Code is S and V:1090, A:265. Is 265 A (500% of Rated current 52A) locked rotor current? What is the standard hot-locked rotor time for...
  4. Dhruv B Patel

    Selection of MCCB Protection for Inrush current of 11 kv/0.433 kV, 1000 KVA Transformer

    Is the inrush current value doubled or changed marginally, while two transformers (Step up and step down) are connected in series? How do select MCCB Protection for the Inrush current of two 11 kV/0.433 kV and 0.433 kV/11 kV 1000 KVA Transformers?

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