Circuit breakers
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Circuit breakers are installed in electrical panels to shut off power when too much current flows, such as from too many devices plugged in or a short circuit. They contain contacts that separate when a fault is detected to immediately stop the flow of electricity. Circuit breakers can be classified by voltage level—low, medium, or high voltage—or by their arc suppression method, which includes air, oil, sulfur hexafluoride, vacuum, and magnetic circuit breakers. Vacuum and sulfur hexafluoride circuit breakers are commonly used today due to their reliable and fast operation in shutting off electric current during a fault.
Circuit breakers
- 1. Power Stations & Subtations Lecture Work Mehmet Çağrı AKSOY
- 2. â–ªA circuit breaker is a device designed to shut off an electrical circuit when too much current is flowing. â–ªThis usually occurs if too many devices are plugged in or if there is a short circuit. Circuit breakers are usually installed in the electrical panel. Inside the circuit breaker, there is usually two contacts which is touched between.When detect a fault in the system, poles are divided each other. The system reacts to immediate short circuits.The process can be change different circuit breaker types.
- 3. â–ª The types of circuit breakers can be divided by these fields; â–ªBy voltage level â–ª Low Voltage (1-1kv) â–ª MediumVoltage (1-72kv) â–ª HighVoltage (72.5-.. Kv) â–ª Arc suppression type â–ª Air circuit breaker â–ª CO2 circuit breaker â–ª Disconnecting circuit breaker â–ª Oil circuit breaker â–ª Sulfur hexafluoride circuit breaker â–ª Vacuum circuit breaker â–ª Magnetic circuit Breaker
- 4. â–ªThe magnetic circuit breakers uses electromagnet also called solenoid. â–ªWhen the current exceeds the specified value, the system is opened with the help of the electromagnet and the current is cut off.
- 5. â–ª Common in domestic, small industrial and commercial applications include Miniature circuit breaker (type B, type C and type D)and Molded Case Circuit Breaker versions. â–ª Characteristics given by international standards. â–ª Also It is made for DC applications.
- 6. â–ªOil circuit breaker is very easy in construction.The oil behaves, isolator between the contacts and it uses for arc extinguishing. â–ªDue to environmental and cost concerns over insulating oil spills, most new breakers use SF6 gas to quench the arc.
- 7. â–ª In this type of circuit breaker, the contacts of device surrounded by SF6 â–ª They are most often used for high voltage transmission-level voltages. Especially cold places heating might be require to prevent gas liquefaction.
- 8. 115KV SF6
- 9. â–ª The disconnecting circuit breaker (DCB) was introduced in 2000 and is a high-voltage circuit breaker modeled after the SF6-breaker.The DCB is also high voltage circuit breaker. â–ª The type of circuit breaker reduces the space requirement, increases availability and reliability.
- 10. â–ªIn this circuit breaker, the fixed and moving contact is enclosed in a permanently vacuum area. â–ªVacuum circuit breaker has a high insulating medium for arc extinction as compared to the other circuit breaker. â–ªWhen the fault occurs in the system, the contacts of the breaker are moved apart and hence the arc is developed between them.
- 11. ▪ Works on the same principle as Sulphurre hexafluoride circuit breaker, can also be produced as a disconnecting circuit breakers, high voltage breaker ▪ Possible to reduce nearly 10 tons of carbon dioxide emissions during the product’s life time .
- 12. â–ªCircuit breaker is an essential part of electrical network as it protects every device from electrical damage â–ªHelps us to detect the fault and the area associated with it â–ªNowadays vacuum and sulphur hexaflouride circuit breakers are widely used due to their reliable and fast operations
- 13. â–ª Wikipedia.com, Mr. Priyankar Misra's presentation, circuitglobe.com