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CIRCUIT BREAKER
WHAT IS A CIRCUIT BREAKER?
• A circuit breaker is an equipment that breaks a
circuit either manually or automatically unde...
Operating Principle
Two contacts called electrode remains closed
under normal operating conditions. When fault
occurs on a...
Arc Phenomenon
• An arc is struck when contacts are separated. The
current is thus able to continue. Thus the main
duty of...

The arc resistance depends upon the
following factors.

Degree of ionization

Length of the arc

Cross Section of the...
Methods of Arc Extinction
High Resistance Method
Low Resistance Method
TYPES OF
CIRCUIT
BREAKER
OIL
CIRCUIT
BREAKER
AIR BLAST
CIRCUIT
BREAKER
SF6
CIRCUIT
BREAKER
VACCUM
CIRCUIT
BREAKER
Breaker Used In 132KV Grid
Station
• Oil Circuit Breaker
• Vacuum Circuit breaker
• SF6 Circuit Breaker
Air
cushion
Bulk Oil Circuit breaker
Low Oil Circuit Breaker
Consists of two parts.
Supporting
Chamber.
Circuit-Breaking
chamber( consist
of fixed and
moving c...
Disadvantages Of Oil Circuit Breaker
• It is inflammable and there is a risk of fire.
• It may form an explosive mixture w...
Vacuum Circuit Breaker
• Vacuum is used as an arc quenching medium.
• Have greatest insulating strength.
• 10-7
to 10-5
pr...
Vacuum Circuit Breaker
Advantages
• Compact, reliable and have longer life.
• No fire hazards.
• No generation of gas during and after
operation....
SF6 Circuit Breaker
1. Sulphur Hexafluoride (SF6) gas is used as an arc
quenching medium.
2. SF6 is an electro-negative ga...
Advantages
• Simple construction, less cost.
• SF6 gas is non flammable, non toxic &
chemical inert gas.
• Same gas is rec...
Advantages Of SF6 Over Oil Circuit Breakers
• Short arcing time
• Can interrupt much larger currents
• Gives noiseless ope...
THE END
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Circuit breaker

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Transcript of "Circuit breaker"

  1. 1. CIRCUIT BREAKER
  2. 2. WHAT IS A CIRCUIT BREAKER? • A circuit breaker is an equipment that breaks a circuit either manually or automatically under all conditions at no load, full load or short circuit.
  3. 3. Operating Principle Two contacts called electrode remains closed under normal operating conditions. When fault occurs on any part of the system, the trip coil of the circuit breaker get energized and contacts are separated.
  4. 4. Arc Phenomenon • An arc is struck when contacts are separated. The current is thus able to continue. Thus the main duty of a circuit breaker is to distinguish the arc within the shortest possible time. • The arc provides the low resistance path to the current and the current in the circuit remains uninterrupted.
  5. 5.  The arc resistance depends upon the following factors.  Degree of ionization  Length of the arc  Cross Section of the arc
  6. 6. Methods of Arc Extinction High Resistance Method Low Resistance Method
  7. 7. TYPES OF CIRCUIT BREAKER OIL CIRCUIT BREAKER AIR BLAST CIRCUIT BREAKER SF6 CIRCUIT BREAKER VACCUM CIRCUIT BREAKER
  8. 8. Breaker Used In 132KV Grid Station • Oil Circuit Breaker • Vacuum Circuit breaker • SF6 Circuit Breaker
  9. 9. Air cushion Bulk Oil Circuit breaker
  10. 10. Low Oil Circuit Breaker Consists of two parts. Supporting Chamber. Circuit-Breaking chamber( consist of fixed and moving contact)
  11. 11. Disadvantages Of Oil Circuit Breaker • It is inflammable and there is a risk of fire. • It may form an explosive mixture with air. • It requires maintenance. • Absorbs moisture, so dielectric strength reduces. • Oil leakage problem. • Oil has to be replaced after some operations because of the carbonization of oil.
  12. 12. Vacuum Circuit Breaker • Vacuum is used as an arc quenching medium. • Have greatest insulating strength. • 10-7 to 10-5 pressure is to be maintained. • Used in 11KV panel in control room of grid station.
  13. 13. Vacuum Circuit Breaker
  14. 14. Advantages • Compact, reliable and have longer life. • No fire hazards. • No generation of gas during and after operation. • Can interrupt any fault current. • No noise is produced while operating. • Require less power for control operation.
  15. 15. SF6 Circuit Breaker 1. Sulphur Hexafluoride (SF6) gas is used as an arc quenching medium. 2. SF6 is an electro-negative gas. 3. It has strong tendency to absorb electrons. 4. When contact are opened in a high pressure flow of SF6 gas, arc produced. 5. Free electron in the arc are captured by the gas. 6. Which build up enough insulation strength to extinguish arc. 7. it is much effective for high power and high voltages services,
  16. 16. Advantages • Simple construction, less cost. • SF6 gas is non flammable, non toxic & chemical inert gas. • Same gas is recirculated in the circuit. • Maintenance free C.B. • Ability to interrupt low and high fault current. • Excellent Arc extinction.
  17. 17. Advantages Of SF6 Over Oil Circuit Breakers • Short arcing time • Can interrupt much larger currents • Gives noiseless operation due to its closed gas circuit • No moisture problem • No risk of fire • No carbon deposits. So no tracking and insulation problems • Low maintenance cost
  18. 18. THE END
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