What is the function of vacuum circuit breaker?
A vacuum circuit breaker is a kind of circuit breaker where the arc quenching takes place in a vacuum medium. The operation of switching on and closing of current carrying contacts and interrelated arc interruption takes place in a vacuum chamber in the breaker which is called a vacuum interrupter.
How much vacuum is sufficient in vacuum circuit breakers?
10– 6 bar
The vacuum pressure inside a vacuum interrupter is normally maintained at 10– 6 bar. The material used for current carrying contacts plays an important role in the performance of the vacuum circuit breaker.
Where is vacuum circuit breaker used?
Circuit-breaker vacuum interrupters are used primarily in the power sector in substation and power-generation facilities, and load-switching vacuum interrupters are used for power-grid end users.
Which gas is used in VCB?
SF6 Gas Insulation
Vacuum Circuit Breaker (VCB)Tank Type Vacuum Circuit Breaker (SF6 Gas Insulation)
How do I select a VCB rating?
The voltage rating for a VCB can be up to 35 kV….Observe the base specifications for their 12 kV VCB:
- Rated voltage = 12 kV.
- Rated current = 630 A, 1,250 A.
- Rated breaking current = 25 kA.
- Rated short-time withstand current (3s) = 25 kA.
- Rated short-circuit making current (crest factor) = 63 kA (50 Hz), 65 kA (60 Hz)
What is the meaning of VCB in electrical?
Vacuum circuit breakers are compact designed for safe operation, high reliability and easy maintenance, and are widely used for various types of high voltage circuits. Fuji HS series vacuum circuit breakers (VCB) have been developed through the use of our many years of successful experience and advanced technology.
Which circuit breaker is used for 11KV?
Rated Voltage: 11KV ABB Vacuum Circuit Breaker, Breaking Capacity: 26.3 Ka
| Rated Voltage | 11KV |
|---|---|
| Rated Current | 630,800,1250 |
| Breaking Capacity | 26.3 KA |
| Brand | ABB |
| Degree Of Protection | IP-45 |
How many types of VCB are there?
By the arc extinction medium, the circuit breaker is categorised into four types. They are the air break circuit breaker, air blast circuit breaker, sulphur hexafluoride circuit breaker and vacuum circuit breaker.
How do I choose a breaker size?
How do I size a breaker? Generally, you should size a breaker for 125% of the load (or 25% extra capacity) and no less. Oversized breakers can allow wires to heat above safety levels without stopping the current. On the other hand, undersized breakers may continuously trip under normal operation.
Why We Use VCB instead of ACB?
Due to the integrity of Vacuum Bottles compared to ACB. Plus the VCB are way less maintenance demanding compared to ACB which demand more frequent maintenance on them. Number of operations which VCB can withstand are much more. No arc chutes issue and many more advantages.