Technical Parameters of a Potential Transformer (PT)

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  • Potential Transformers are of
    1. Electromagnetic Type,
    2. Outdoor Type,
    3. Single Phase,
    4. Oil filled self cooling type,
    5. with Porcelain Housing.
  • The Standards to be followed for a Potential or Voltage Transformers
    1. IS 3156 (Part 1 to 4)
    2. IS 4146 – Application guide for Voltage Transformers
  • Temperature Rise Limits
    1. Maximum Winding Temperature Rise Limit is 50oC above ambient
    2. Maximum Oil Temperature Rise Limit is 40oC above ambient
    3. Maximum Ambient Temperature Limit is 50oC .