What is K factor in circuit breaker?
The K-factor is the ratio of the rated maximum voltage to the lowest operating voltage for which the inverse relationship between the operating voltage and the interrupting current holds true. The K-factor is a limit for derating the interrupting current for a varying operating voltage.
What is K rating of MCB?
kA rating of an MCB or an MCCB is the maximum current it can safely interrupt in case of a short circuit. For example, if the MCB is rated at 10kA, it means that the MCB can safely break the circuits during short circuit unless until the short-circuited current does not exceed 10kA.
Which circuit breaker is used for medium voltage?
Vacuum Circuit Breaker Vacuum circuit breakers are the most popular type of medium-voltage breaker for industrial environments due to their compact size and improved reliability compared to air circuit breakers.
What is latching current in circuit breaker?
Rated closing and latching capability – The circuit breaker shall be capable of closing and latching any power frequency making current whose maximum peak is equal to or less than 2.6 (for 60 Hz power frequency; 2.5 for 50 Hz power frequency) times the rated short-circuit current.
What is K factor in electricity?
K factor is defined as a ratio between the additional losses due to harmonics and the eddy current losses at 60Hz. It is used to specify transformers for non-linear loads. A transformer with K factor 9 should be specified when 100% of the load is non-linear. For critical applications, K=13 can be considered.
What is K in Mccb?
kA rating of an MCB or an MCCB is the maximum current it can safely interrupt in case of a short circuit. If the current goes beyond this value, the circuit breaker could be damaged. kA rating is known as the short circuit withstand capacity or ultimate breaking capacity of a circuit breaker.
What is the rating of double pole MCB?
Two-pole breakers are rated 120/240 or 240 V AC. Standard sizes are plugged onto two adjacent stabs to obtain 240 V between both parallel “hot” bus bars. They are available with 10- to 125-V ratings.
What is medium voltage breaker?
Medium voltage circuit breakers are the ones which operate on voltage levels around 400 volts to 15kV approximately. One thing that is different about the medium voltage circuit breakers is that unlike most of the types of these breakers, they can be operated manually as well.
Which circuit breaker is most suitable for medium voltage and why?
Medium voltage switchgear with vacuum circuit breaker is most suitable for traction application. We can conclude that, in the medium voltage system where the tripping rate is very high, MV Vacuum Switchgear is the most suitable solution.
What is the difference between latching and holding current?
The main difference between latching and holding current of SCR is that latching current is related with turn on process while holding current is related with turn off process of SCR. Holding current of SCR or thyrsistor is that minimum value of current below which anode current must fall to come in OFF state.
What is close and latch rating?
Close & Latch Rating or Making Current This term highlights the capability of a circuit breaker to close into a fault at the 1/2 cycle point and stay in that position without destroying its poles.