Products Description
Vacuum circuit breakers are mainly composed of vacuum interrupters, insulating supports, operating mechanisms, and transmission systems.
1. Vacuum arc extinguishing chamber
• Function: To break and close the current in a vacuum (above 10-4), utilizing the high insulation strength of vacuum and the diffusion-type rapid extinction characteristics of the arc.
• Core components:
• Contact system: Typically uses copperchromium alloy contacts designed with longitudinal or transverse magnetic fields, which suppresses the welding and arc accumulation on the contact surface during high current breaking.
• Shielding cover:s the ceramic shell from metal vapor pollution and ensures a uniform electric field distribution.
• Bellows: Achieves the sealed movement of the moving contact, and the fatigue directly affects the mechanical life of the circuit breaker.
• Ceramic shell: Provides high insulation and mechanical strength.
Vacuum arc extinguishing chamber
• Function: To open and close the current in a vacuum (above 10^-4 Pa) utilizing the high insulation strength of vacuum and the diffusion-type rapid extinction characteristics of the arc.
• Core components:
• Contact system: Typically uses copper-chromium alloy designed with longitudinal or transverse magnetic fields, which suppresses the welding and arc accumulation on the contact surface during high current opening.
• Shielding cover: Protects the ceramic shell metal vapor pollution and ensures a uniform electric field distribution.
• Bellows: Enables the sealed movement of the moving contact, and its fatigue life directly affects the mechanical life the circuit breaker.
• Ceramic shell: Provides high insulation and mechanical strength.
Influence of transmission characteristics on performance
Characteristic parameters Effects
Unsatisfactory opening speed Arc burning time is long, contact is aggravated, and it may fail to open
Excessive closing bounce Multiple arc reignitions can be caused, resulting in overvoltage, and the risk of contact increases
Insufficient travel Contact pressure decreases, temperature rise increases, and the contacts may be repelled during short circuit
Mechanical jamming/loosening Uninter motion, time parameters are dispersed, and reliability is reduced
4. Optimization Directions
1. Structural Design:
• Finite element analysis is used to optimize the linkage transmission ratio to match the curve with the switching requirements.
• Low-wear materials (such as self-lubricating bearings) are selected to improve mechanical life.
2. Operating Mechanismatching:
• The spring mechanism requires precise calculation of energy storage and release curves; the permanent magnet mechanism requires optimization of coil drive logic.
3. State Monitoring:
• displacement sensor is installed to monitor the stroke-time curve, enabling online diagnosis of mechanical characteristics.
5. Summary
The transmission system of the vacuum circuit breaker is the coupling hub of mechanical energy and the requirement of arc breaking. Its core lies:
• Precise control of the contact motion curve to match the physical process of the vacuum arc;
• Ensuring sufficient mechanical reliability to adapt to thousands of operations and-circuit conditions;
• Improving the overall life and stability of the circuit breaker through structural optimization and intelligent monitoring.
Modern vacuum circuit breakers are developing towards, high reliability, and maintenance-free, and the precise design and dynamic characteristics analysis of the transmission system are still the key technical foundation.
phoebe
Sales Manager
Wechat/WhatsApp/Telegram：+86 18091766017
E-mail：xdtz05@westpowerelectric.com
Address:Shaanxi Province,Baoji City,Jintai District,Chencang Avenue, South Slope,Industrial Park,
