Why is restricted earth fault needed?

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Tags

1. #secondary
2. #primary
3. #while
4. #detect
5. #differential
6. #fault
7. #relay
8. #sensitive
9. #phase
10. #restricted
11. #transformer
12. #within
13. #protection
14. #sides
15. #settings
16. #mainly
17. #winding
18. #earth
19. #faults
20. #reason