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  1. sarawakmiri

    Transformer In rush current

    why specify transformer oa / fa / 55/ 65c
  2. sarawakmiri

    secondary rated amps for TRANSFORMER rated OA/FA/FOA, 55/65 C, CAN FA Rated KVA BE USED IN MOTOR STA

    7anoter4, Thank you for your reply. I start to understand the application of transformers and would size such secondary feeders for continuous duty at the largest Rated KVA.
  3. sarawakmiri

    secondary rated amps for TRANSFORMER rated OA/FA/FOA, 55/65 C, CAN FA Rated KVA BE USED IN MOTOR STA

    Thank you for your reply. When and why would you even want to specify OA/FA/FOA rated Transformer instead of ONAN ??
  4. sarawakmiri

    Standard for OA/FA/FOA TRANSFORMER, REF. Sizing Secondary conductors

    Have searched all over for written standard that specifically addresses sizing the Secondary conductors for OA/FA/FOA, 55 / 65 C. TRANSFORMER. I have been unable to find anything. Logic would suggest the max load would be fixed for the OA Rated KVA. And the FA/ FOA RATING IS FOR AMBIENT...
  5. sarawakmiri

    secondary rated amps for TRANSFORMER rated OA/FA/FOA, 55/65 C, CAN FA Rated KVA BE USED IN MOTOR STA

    Bill and Dave thank you for your answers much appreciate your technical expertise.
  6. sarawakmiri

    secondary rated amps for TRANSFORMER rated OA/FA/FOA, 55/65 C, CAN FA Rated KVA BE USED IN MOTOR STA

    Davidbeach, thank you that makes me in agreement with you. How would you size the secondary feeders and have you a technical reference for support. Love this forum.
  7. sarawakmiri

    secondary rated amps for TRANSFORMER rated OA/FA/FOA, 55/65 C, CAN FA Rated KVA BE USED IN MOTOR STA

    Thank you for your answers. I understand the Transformer Impedance is Given with the Transformer and the available short circuit current is calculated using the base Rated KVA I,e OA Rated KVA. I understood the normal design load on the transformer was based on the OA Rated KVA. The max motor...
  8. sarawakmiri

    secondary rated amps for TRANSFORMER rated OA/FA/FOA, 55/65 C, CAN FA Rated KVA BE USED IN MOTOR STA

    Have searched all over and can find no technical answer. If the Transformer is rated as OA/FA/FOR, 55 / 65 C. WOULD YOU ASSOME THE FOA KVA RATING WOULD BE REQURED FOR 3 HOURS OR MORE AND SIZE THE SECONDARY FEEDER CONDUCTORS AT. FOA. KVA. AMPS x 1.25 %. and can the Rated KVA at FA rating be used...
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