1.Why the transformer rating is in MVA. 2.What is the use of Isolator. 3.Types of Circuit breaker and their differences.

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Answers to questions related to transformers, isolators, and circuit breakers.

Transformer rating is in MVA because it indicates the maximum power that can be transferred through the transformer.
Isolators are used to isolate a section of the electrical circuit for maintenance or repair work.
Types of circuit breakers include air, oil, vacuum, and SF6 circuit breakers, each with their own advantages and disadvantages.
Air circuit breakers are commonly used in low voltage applications, while oil circuit breakers are used in high voltage applications.
Vacuum circuit breakers are used in medium voltage applications, and SF6 circuit breakers are used in high voltage applications.
The main difference between these circuit breakers is the medium used to extinguish the arc that forms when the circuit is broken.
Air circuit breakers use compressed air, oil circuit breakers use oil, vacuum circuit breakers use a vacuum, and SF6 circuit breakers use SF6 gas.
SF6 circuit breakers are the most commonly used type of circuit breaker in high voltage applications due to their high interrupting capacity and low maintenance requirements.

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