How to extinguish arc in vacuum circuit breaker
1. Core arc extinguishing principle
High vacuum environment
The contact of VCB breaks the circuit in a vacuum, and the vacuum degree usually reaches below 10⁻⁴mmHg.
Arc suppression mechanism
Ionization and ionization: When the contacts are separated, the surrounding medium undergoes ionization, thermal ionization and collision ionization, generating an arc3.
Vacuum cooling effect: The arc cools rapidly in a vacuum, the temperature drops below the ignition point, and the arc extinguishes naturally.
2. Main arc extinguishing methods
Magnetic blow-out
The electromagnetic force stretches the arc and blows it into the solid medium (such as ceramic or metal sheet) in the arc extinguishing hood, and the arc is extinguished by cooling4.
Grid arc extinguishing
The arc is pushed into the metal grating to form multiple insulation areas. This method is often used in AC electrical appliances because of its high arc extinguishing efficiency.
3. Supplementary explanation
Vacuum recovery ability: After the arc is extinguished, the vacuum gap withstand voltage level recovers quickly, and can withstand high recovery voltage, ensuring that the insulation performance is maintained after multiple opening and closing.
Structural advantages: Vacuum circuit breakers have the advantages of simple structure, small size, long life and low maintenance, and are suitable for high-voltage power distribution and industrial fields.
VTZ-40.5K vacuum circuit breaker by Shaanxi West Power Tongzhong Electrical Co., Ltd.is a 40.5kV vacuum circuit breaker from our company's VTZ modular mechanism series, which has been extensively optimized and improved in mechanical transmission, main structure, and secondary circuits.It can be used in New energy fields (photovoltaic, wind power),Power grid systems,Power infrastructure,Industrial fields (chemical industry, steel, petroleum, coal, etc.)and User product project upgrades.
Should you have any requirements in these fields, please feel free to contact us as per following information:
Email: xdtz04@westpowerelectric.com
Website: https://www.xdtzelectrical.com/
Tel:+86 917 3661109
Mobilephone(whatsapp ): +86 18091765882
