08-03-2015, 01:48 PM
ppt seminar of circuit breaker switching and arc moduling with base paper and documentation
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ppt seminars of circuit breaker switching arc modeling
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ppt seminar of circuit breaker switching and arc moduling with base paper and documentation
25-03-2017, 01:08 PM
A power failure or short circuit may occur in the system at any time. It may not even give us a chance to turn off the connected devices. This can sometimes lead to significant losses because the faulty current passing through the mains system can damage the electrical equipment. Therefore, it is important to remove the power from the system as soon as possible.
For this, several switching systems must be implemented so that not only the current causing the disturbance is removed from the network, but also that the devices achieve the current to cause a minimum loss.
Circuit Breaker Switching
For the purpose of switching, the circuit breaker is a device being used. Circuit breaker is a device that can work both manually and automatically. It is widely required to protect electrical appliances from damage. Care must be taken during circuit breaker design since the power systems we use today use huge amounts of current.
Circuit Breaker Principle
A high arc is created between the moving and fixed contacts due to the large current moving between them. Therefore, there is a need to cool the arc safely and this can be maintained if there is a sudden increase in the dielectric resistance that moves between the contacts that carry current from the circuit breaker. In order to increase the dielectric strength three ways can be used:
1. One way is to compress the ionized arc medium. This is a way to accelerate the process of deionization of the medium.
2. Another way is to cool the arc medium as this increases the resistance of the arc path.
3. The third way is to renew the gases of the ionized arc media.
A large number of vacuum switch commutations in facilities supplying arc furnace transformers make these systems particularly susceptible to overvoltage transients. This paper studies the role of a vacuum circuit breaker in a local arc furnace installation that suffered several transformer interruptions. Emphasis is placed on the voltage and current transients derived from the switching of the switch. The digital simulation of circuit breaker operation proves that the lack of a voltage suppression circuit was the main cause of the overvoltages affecting the arc furnace transformer and also shows its effect on the suppression of these transients.
![[Image: Circuit-Breaker-Switching-Arc-Modeling-2.jpg]](http://engineering.electrical-equipment.org/wp-content/uploads/2013/04/Circuit-Breaker-Switching-Arc-Modeling-2.jpg)
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