VCB (Vacuum Circuit Breaker)
A VCB (Vacuum Circuit Breaker) is a type of circuit breaker where the arc quenching takes place in a vacuum. It is widely used in medium-voltage power systems (typically 11kV to 33kV) due to its reliability, fast operation, and low maintenance requirements.
Working Principle of VCB:
1. Contacts Separation: When a fault occurs, the breaker contacts open, creating an arc between them.
2. Arc Extinction: The vacuum inside the breaker (10-6 to 10-8 torr) quickly extinguishes the arc since there are no ionized particles to sustain it.
3. Dielectric Strength Recovery: The vacuum ensures rapid recovery of insulation strength, preventing further current flow.
Advantages of VCB:
High dielectric strength.
Minimal maintenance as there is no oil or gas.
Fast arc quenching.
Longer lifespan compared to other breakers.
No fire hazards since it doesn't use oil.
Applications of VCB:
Power distribution systems (11kV-33kV).
Industrial and commercial substations.
Railways and metro systems.
Renewable energy plants (solar, wind).
एक टिप्पणी भेजें