What is the difference between breaking capacity and making capacity?

What is the difference between breaking capacity and making capacity?

Breaking Capacity is the level of current the circuit breaker can interrupt without damaging itself electrically or structurally. Making Capacity is the level of current at which the circuit breaker can be closed without any damage to itself electrically or structurally.

What is the breaking capacity of a circuit breaker?

Breaking capacity or interrupting rating is the current that a fuse, circuit breaker, or other electrical apparatus is able to interrupt without being destroyed or causing an electric arc with unacceptable duration.

What is making and breaking current of circuit breaker?

The making current of circuit breaker is the maximum peak value of the current that the breaker can interrupt without any damage if the breaker is closed at fault. The making current of the circuit breaker is always more than the breaking current. There are three periods of time after occurrence of the fault.

Which of the following makes capacity of circuit breaker?

• MAKING CAPACITY The peak value of current during the first cycle of current wave after the closure of circuit breaker is known as making capacity. To find making capacity multiply symmetrical breaking current by root 2 to convert from r.m.s to peak and then by 1.8 to include the doubling effect of maximum asymmetry.

Is it logical to express the breaking capacity of a circuit breaker in MVA explain?

It is clearly illogical to express the rating of a circuit breaker in MVA because there is a very low voltage and highest current during the short circuit circuit faults. That’s why the breaking capacity rating of a circuit breaker can’t be expressed in MVA.

Is a higher breaking capacity better?

The greater the breaking capacity, the higher the safety. For example, when the ICU is selected as 35KA, if the short circuit current in the line is 20KA, it will be cut off in time; but if the ICU is 20KA, the short circuit current is 35KA and it cannot be disconnected.

Why is making capacity 2.5 times higher than breaking capacity of a circuit breaker?

The making capacity of the circuit breaker is usually greater than the breaking capacity of a circuit breaker as breaking an electric circuit is difficult due to arcing which occurs and which has to be quenched.

Why is break current stronger than make current?

From the above discussion, it is clear that Making Current is peak value of current during Subtransient state including the DC offset value where as Breaking Current is RMS value of current at the instant of Breaker Contact separation. Therefore, making Current must be higher than the Breaking Current.

Why making current is 2.5 times the breaking current?

The breaker’s contacts have to withstand this highest value of current during the first cycle of waveform when breaker is closed under fault. The normal value of short circuit making current is 2.5 times more than short circuit breaking current.

Why does a breaker keep tripping?

If your circuit breaker keeps tripping, it’s usually a sign of something wrong with the circuit. There could be a short circuit in one of the appliances or somewhere in the wiring. There could be a ground fault causing the breaker to keep tripping. There could be a circuit overload.

What is the making capacity of circuit breaker Mcq?

Making capacity = 2.55 X breaking capacity (for all circuit breakers) = 2.55 X 2000 = 5100 MVA.

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