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  1. Types of fault and abnormal Conditions to be protected against

  2. Quantities available for measurement

  3. Types of protection available

  4. Speed

  5. Fault position discrimination

  6. Dependability / reliability

  7. Security / stability

  8. Overlap of protections

  9. Phase discrimination / selectivity

  10. CT’s and VT’s ratio required

  11. Auxiliary supplies

  12. Back-up protection

  13. Cost

  14. Duplication of protection

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12y ago

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Q: When backup protection is economically justified?
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