Numerical - Symmetrical breaking current for given three phase, 33 kV oil circuit breaker

Q.  A three phase, 33 kV oil circuit breaker is rated 1200 A, 2000 MVA, 3s. What is its symmetrical breaking current?
- Published on 18 Nov 15

a. 1200 A
b. 3600 A
c. 35 kA
d. 104.8 kA

ANSWER: 35 kA
 

    Discussion

  • Sanjit    -Posted on 22 Aug 18
    1500 A, 33 KV, 3 sec., 3-phase oil circuit breaker. Determine the making current :
  • Surjeet Kumar   -Posted on 04 Feb 17
    Thanks for this much good amount of questions
  • marciano   -Posted on 31 Jul 16
    breaking capacity (MVA) = root 3 x symmetrical breaking current x rated Voltage.
    therefore symmetrical breaking current = breaking capacity (MVA)/( root 3 x rated Voltage) = 35KA

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