A three-phase 33 kV, oil-circuit breaker is rated 1500 A, 2000 MVA, 2 s. The symmetrical breaking current for this breakerwould bea)40 kAb)25 kAc)35 kAd)50 kACorrect answer is option 'C'. Can you explain this answer? - EduRev Electrical Engineering (EE) Question

Explore Courses UPSC Exam UPSC Test Series Free Notes EduRev Infinity

Open App

Electrical Engineering (EE) Exam > Electrical Engineering (EE) Questions > A three-phase 33 kV, oil-circuit breaker is r...

Join the Discussion on the App

A three-phase 33 kV, oil-circuit breaker is rated 1500 A, 2000 MVA, 2 s. The symmetrical breaking current for this breaker would be

a)
40 kA
b)
25 kA
c)
35 kA
d)
50 kA

Correct answer is option 'C'. Can you explain this answer?

FREE This question is part of

Test: Circuit Breakers

Attempt Test

Attempt this Test

Most Upvoted Answer

A three-phase 33 kV, oil-circuit breaker is rated 1500 A, 2000 MVA, 2 ...

Given Data:
- Voltage rating of the circuit breaker (V) = 33 kV
- Current rating of the circuit breaker (I) = 1500 A
- Power rating of the circuit breaker (S) = 2000 MVA
- Time duration for the circuit breaker to interrupt the fault current (t) = 2 s

Formula Used:
- Symmetrical breaking current (Ibk) = S / (√3 * V)

Calculation:
- The formula to calculate the symmetrical breaking current is Ibk = S / (√3 * V)
- Plugging in the given values, we get Ibk = 2000 MVA / (√3 * 33 kV)

Simplifying the Calculation:
- Converting the power rating from MVA to kVA, we get 2000 MVA = 2000 * 1000 kVA = 2,000,000 kVA
- Substituting the values, Ibk = 2,000,000 kVA / (√3 * 33 kV)
- Simplifying further, Ibk = 2,000,000 / (√3 * 33) kA

Calculating the Symmetrical Breaking Current:
- Evaluating the expression, we get Ibk ≈ 35 kA

Conclusion:
- The symmetrical breaking current for this three-phase 33 kV oil-circuit breaker is approximately 35 kA. Hence, option 'C' is the correct answer.

Answered by Machine Experts · View profile

Free Test

FREE

Test: Circuit Breakers
15 Ques | 30 Min

Start Free Test

View all free Electrical Engineering (EE) tests

Community Answer

A three-phase 33 kV, oil-circuit breaker is rated 1500 A, 2000 MVA, 2 ...

Concept:

Breaking current: It expresses the highest number of short-circuit currents that the breakers are capable of breaking under specified conditions of transient recovery voltage and power frequency voltage. It is expressed in kA (RMS) at contact separation. The breaking capacities are divided into two types.

Symmetrical breaking capacity of a circuit breaker
Asymmetrical breaking capacity of a circuit breaker

Rated symmetrical breaking current

Making current of a circuit breaker is the peak value of the maximum current loop during sub transient condition including the DC component when the breaker closes.

Symmetrical making current = 2.55 × symmetrical breaking current

Calculation:

Rated current = 1500 A

MVA rating = 2000 MVA

Rated symmetrical breaking current

Share via Whatsapp

Attention Electrical Engineering (EE) Students!

To make sure you are not studying endlessly, EduRev has designed Electrical Engineering (EE) study material, with Structured Courses, Videos, & Test Series. Plus get personalized analysis, doubt solving and improvement plans to achieve a great score in Electrical Engineering (EE).

Network Theory (Electric Circuits)

GATE Electrical Engineering (EE) Mock Test Series 2025

General Aptitude for GATE

GATE Notes & Videos for Electrical Engineering

View all answers Start learning for free

< Previous Question Next Question >

Explore Courses for Electrical Engineering (EE) exam

Similar Electrical Engineering (EE) Doubts

A 150 MVA, 22 kV synchronous generator having a reactance of= 0.2 pu,xd = 1.1puis connected to a transformer through a 5-cycle circuit breaker.The generator is at no load and rated voltage when a three-phase short circuit fault occurs between the breaker and transformer. The ratio of momentary current to sustained short circuit current of breaker is - Correct answer is between '17.5,17.7'. Can you explain this answer?

View answer

A three phase generator is rated at 110 MVA, 11 kV is connected through circuit breakers to a transformer. The generator is having direct axis sub-transient reactance, Xd = 19%, transient reactance, Xd = 26% and synchronous reactance = 130%. The generator is operating at no load and rated voltage when a three phase short circuit fault occurs between the breakers and the transformer. The magnitude of initial symmetrical rms (in k

View answer

The 33 kV busbars of a station are in two sections A and B separated by a reactor. Section A is fed from four 10 MVA generators each having a reactance of 20% section B is fed from the grid through a 50 MVA transformer of 10% reactance. The circuit breakers have each a rupturing capacity of 500 MVA. Find the reactance (in Ω) of the reactor to prevent the circuit breakers from being overloaded, if a symmetrical three-phase fault occurs on an outgoing feeder connected for it. (Take base voltage of 33 KV and base MVA of 50). Correct answer is between '1.3,1.6'. Can you explain this answer?

View answer

The 11-kV busbars of a power station are in two sections inter-connected through a current limiting reactor X. Each section of the busbars is fed from two 11 kV, 25 MVA generators each having sub-transient reactance of 18% on its rating. The MVA rating of the circuit breaker is 500. Find the reactance of the reactor to prevent the circuit breaker from being overloaded if a symmetrical 3-phase fault occurs at one of the outgoing feeders.?

View answer

The rated making current of a circuit breaker is given as 90 kA (peak). The braking capacity of circuit breaker if it is rated at 22 kV Correct answer is between '1344,1346'. Can you explain this answer?

View answer

Top Courses for Electrical Engineering (EE)View all

Network Theory (Electric Circuits)

GATE Electrical Engineering (EE) Mock Test Series 2025

General Aptitude for GATE

GATE Notes & Videos for Electrical Engineering

Engineering Mathematics

Top Courses for Electrical Engineering (EE)

View all

A three-phase 33 kV, oil-circuit breaker is rated 1500 A, 2000 MVA, 2 s. The symmetrical breaking current for this breakerwould bea)40 kAb)25 kAc)35 kAd)50 kACorrect answer is option 'C'. Can you explain this answer?

Share with a Friend

Answer this doubt

Question Description
A three-phase 33 kV, oil-circuit breaker is rated 1500 A, 2000 MVA, 2 s. The symmetrical breaking current for this breakerwould bea)40 kAb)25 kAc)35 kAd)50 kACorrect answer is option 'C'. Can you explain this answer? for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about A three-phase 33 kV, oil-circuit breaker is rated 1500 A, 2000 MVA, 2 s. The symmetrical breaking current for this breakerwould bea)40 kAb)25 kAc)35 kAd)50 kACorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A three-phase 33 kV, oil-circuit breaker is rated 1500 A, 2000 MVA, 2 s. The symmetrical breaking current for this breakerwould bea)40 kAb)25 kAc)35 kAd)50 kACorrect answer is option 'C'. Can you explain this answer?.

Solutions for A three-phase 33 kV, oil-circuit breaker is rated 1500 A, 2000 MVA, 2 s. The symmetrical breaking current for this breakerwould bea)40 kAb)25 kAc)35 kAd)50 kACorrect answer is option 'C'. Can you explain this answer? in English & in Hindi are available as part of our courses for Electrical Engineering (EE). Download more important topics, notes, lectures and mock test series for Electrical Engineering (EE) Exam by signing up for free.

Here you can find the meaning of A three-phase 33 kV, oil-circuit breaker is rated 1500 A, 2000 MVA, 2 s. The symmetrical breaking current for this breakerwould bea)40 kAb)25 kAc)35 kAd)50 kACorrect answer is option 'C'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of A three-phase 33 kV, oil-circuit breaker is rated 1500 A, 2000 MVA, 2 s. The symmetrical breaking current for this breakerwould bea)40 kAb)25 kAc)35 kAd)50 kACorrect answer is option 'C'. Can you explain this answer?, a detailed solution for A three-phase 33 kV, oil-circuit breaker is rated 1500 A, 2000 MVA, 2 s. The symmetrical breaking current for this breakerwould bea)40 kAb)25 kAc)35 kAd)50 kACorrect answer is option 'C'. Can you explain this answer? has been provided alongside types of A three-phase 33 kV, oil-circuit breaker is rated 1500 A, 2000 MVA, 2 s. The symmetrical breaking current for this breakerwould bea)40 kAb)25 kAc)35 kAd)50 kACorrect answer is option 'C'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice A three-phase 33 kV, oil-circuit breaker is rated 1500 A, 2000 MVA, 2 s. The symmetrical breaking current for this breakerwould bea)40 kAb)25 kAc)35 kAd)50 kACorrect answer is option 'C'. Can you explain this answer? tests, examples and also practice Electrical Engineering (EE) tests.

Explore Courses for Electrical Engineering (EE) exam