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Power systems miscellaneous
  1. A three-phase, 33 kV oil circuit breaker is rated 1200 A, 2000 M VA, 3s. The symmetrical breaking current is
    1. 1200 A
    2. 3600 A
    3. 35 kA
    4. 104.8 kA
Correct Option: C

Symmetrical breaking current =
MVA
kA
√3kV

=
2000
√3 × 33

= 34.99 kA
≈ 35 kA


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