At which Voltage level restrike of ARC occurs is called as restriking Voltage. The normal frequency (60 Hz) r.m.s. voltage that appears across the contacts of the circuit breaker after final arc extinction in the steady state is the recovery voltage and is equal to the system voltage.
Restriking Transient Voltage When the current across the contact of the circuit breaker is zero, a high-frequency transient voltage develops in the whole breaker contact and is produced by the sudden distribution of energy between the electric and magnetic field. This transient voltage is called restriking voltage.
Moreover, What is Restriking voltage *?
Restriking Transient Voltage When the current across the contact of the circuit breaker is zero, a high-frequency transient voltage develops in the whole breaker contact and is produced by the sudden distribution of energy between the electric and magnetic field. This transient voltage is called restriking voltage.
Secondly, What is prospective voltage?
“prospective” touch voltage [IEV 195-05-09; 826-11-03] • voltage between simultaneously accessible conductive parts. when those conductive parts are not being touched by a person or an animal.
Simply so, What is the making capacity of the circuit breaker?
Making capacity = 2.55 * symmetrical breaking capacity. It is the period for which the circuit breaker is able to carry fault current while remaining closed.
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.
16 Related Question Answers Found
Why making capacity is greater than breaking capacity?
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.
What is restrike in a circuit breaker?
The term “restrike” is defined as a re-establishment of the current, one-quarter cycle or longer, following interruption of a capacitive current at a normal current zero [1].
How do you calculate breaking capacity?
Multiply the number of sets of electrical windings or other components by the voltage each offers. For example, if you are calculating the breaking capacity connected with a three-phase 520-volt transformer, multiply 3 by 520, giving 1,560 volts. Divide the volt-amperage running through the circuit by this voltage.
What is rated current of circuit breaker?
Rated current (In) This is the maximum value of current that a circuit-breaker, fitted with a specified overcurrent tripping relay, can carry indefinitely at an ambient temperature stated by the manufacturer, without exceeding the specified temperature limits of the current carrying parts.
What is breaking capacity and making capacity?
The making capacity is expressed as a peak value as the dc offset during fault conditions is taken into account. Breaking capacity of the circuit breaker refers to the maximum current in rms value the circuit breaker can interrupt.
What does a circuit breaker detect?
What does a circuit breaker do? A mystery to most, these electrically-powered marvels detect and stop excess current in its tracks. They typically trip when there is an overloaded or short circuit, cutting off current to the problem line until the issue can be safely addressed.
What is meant by rated current?
The current that an electrical device can carry, under specified conditions, without resulting in overheating or mechanical overstress.
What is meant by making capacity of circuit breaker?
Making capacity of a circuit breaker is the maximum current which the breaker can conduct at the instant of closing. The making capacity is considered to the peak value of the first cycle when there is an imaginary short circuit between the phases.
What is meant by recovery voltage?
Posted by k10blogger. It is the normal frequency (50 Hz) r.m.s. voltage that appears across the contacts of the circuit breaker after final arc extinction. It is approximately equal to the system voltage. When contacts of circuit breaker are opened, current drops to zero after every half cycle.
What is meant by prospective fault current?
The prospective short-circuit current (PSCC) is the maximum current that can flow through a shorted electrical circuit. PSCC is also known as available fault current or short-circuit making current. Therefore, the circuit’s supply voltage and its impedance determine the PSCC value.
What is Series rated circuit breakers?
Series rated systems — NEC Section 240.86 includes requirements that allow a circuit breaker to be used on a circuit having an available fault current higher than the marked interrupting rating, provided it is connected on the load side of an acceptable overcurrent protective device having a higher rating, and provided
What is the making capacity of the circuit breaker Mcq?
Making capacity = 2.55 X breaking capacity (for all circuit breakers) = 2.55 X 2000 = 5100 MVA. air blast circuit breaker. vacuum circuit breaker.
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